rewrite the compat API to something more generic

Cargo.lock

@@ -1147,6 +1147,7 @@ dependencies = [
  "anyhow",
  "big_s",
  "flate2",
+ "http",
  "index",
  "index-scheduler",
  "insta",

dump/Cargo.toml

@@ -20,6 +20,7 @@ log = "0.4.17"
 index-scheduler = { path = "../index-scheduler" }
 meilisearch-auth = { path = "../meilisearch-auth" }
 meilisearch-types = { path = "../meilisearch-types" }
+http = "0.2.8"
 
 [dev-dependencies]
 big_s = "1.0.2"

dump/src/reader/compat/mod.rs

@@ -1,12 +1,150 @@
 // pub mod v2;
 // pub mod v3;
 // pub mod v4;
+use crate::Result;
 
-// pub mod v4_to_v5;
+use self::{
+    v4_to_v5::CompatV4ToV5,
+    v5_to_v6::{CompatIndexV5ToV6, CompatV5ToV6},
+};
+
+use super::{
+    v5::V5Reader,
+    v6::{self, V6IndexReader, V6Reader},
+};
+
+pub mod v4_to_v5;
 pub mod v5_to_v6;
 
-pub struct Compat<From: ?Sized> {
-    from: Box<From>,
+pub enum Compat {
+    Current(V6Reader),
+    Compat(CompatV5ToV6),
+}
+
+impl Compat {
+    pub fn version(&self) -> crate::Version {
+        match self {
+            Compat::Current(current) => current.version(),
+            Compat::Compat(compat) => compat.version(),
+        }
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            Compat::Current(current) => current.date(),
+            Compat::Compat(compat) => compat.date(),
+        }
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        match self {
+            Compat::Current(current) => current.instance_uid(),
+            Compat::Compat(compat) => compat.instance_uid(),
+        }
+    }
+
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<CompatIndex>> + '_>> {
+        match self {
+            Compat::Current(current) => {
+                let indexes = Box::new(current.indexes()?.map(|res| res.map(CompatIndex::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndex>> + '_>;
+                Ok(indexes)
+            }
+            Compat::Compat(compat) => {
+                let indexes = Box::new(compat.indexes()?.map(|res| res.map(CompatIndex::from)))
+                    as Box<dyn Iterator<Item = Result<CompatIndex>> + '_>;
+                Ok(indexes)
+            }
+        }
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<dyn Iterator<Item = Result<(v6::Task, Option<v6::UpdateFile>)>> + '_> {
+        match self {
+            Compat::Current(current) => current.tasks(),
+            Compat::Compat(compat) => compat.tasks(),
+        }
+    }
+
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v6::Key>> + '_> {
+        match self {
+            Compat::Current(current) => current.keys(),
+            Compat::Compat(compat) => compat.keys(),
+        }
+    }
+}
+
+impl From<V6Reader> for Compat {
+    fn from(value: V6Reader) -> Self {
+        Compat::Current(value)
+    }
+}
+
+impl From<CompatV5ToV6> for Compat {
+    fn from(value: CompatV5ToV6) -> Self {
+        Compat::Compat(value)
+    }
+}
+
+impl From<V5Reader> for Compat {
+    fn from(value: V5Reader) -> Self {
+        Compat::Compat(value.to_v6())
+    }
+}
+
+impl From<CompatV4ToV5> for Compat {
+    fn from(value: CompatV4ToV5) -> Self {
+        Compat::Compat(value.to_v6())
+    }
+}
+
+pub enum CompatIndex {
+    Current(v6::V6IndexReader),
+    Compat(CompatIndexV5ToV6),
+}
+
+impl CompatIndex {
+    pub fn new_v6(v6: v6::V6IndexReader) -> CompatIndex {
+        CompatIndex::Current(v6)
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndex::Current(v6) => v6.metadata(),
+            CompatIndex::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<v6::Document>> + '_>> {
+        match self {
+            CompatIndex::Current(v6) => v6
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v6::Document>> + '_>),
+            CompatIndex::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v6::Document>> + '_>),
+        }
+    }
+
+    pub fn settings(&mut self) -> Result<v6::Settings<v6::Checked>> {
+        match self {
+            CompatIndex::Current(v6) => v6.settings(),
+            CompatIndex::Compat(compat) => compat.settings(),
+        }
+    }
+}
+
+impl From<V6IndexReader> for CompatIndex {
+    fn from(value: V6IndexReader) -> Self {
+        CompatIndex::Current(value)
+    }
+}
+
+impl From<CompatIndexV5ToV6> for CompatIndex {
+    fn from(value: CompatIndexV5ToV6) -> Self {
+        CompatIndex::Compat(value)
+    }
 }
 
 /// Parses the v1 version of the Asc ranking rules `asc(price)`and returns the field name.

dump/src/reader/compat/v4_to_v5.rs

@@ -0,0 +1,444 @@
+use std::fs::File;
+
+use crate::reader::{v4, v5, DumpReader, IndexReader};
+use crate::Result;
+
+use super::v5_to_v6::CompatV5ToV6;
+
+pub struct CompatV4ToV5 {
+    from: v4::V4Reader,
+}
+
+impl CompatV4ToV5 {
+    pub fn new(v4: v4::V4Reader) -> CompatV4ToV5 {
+        CompatV4ToV5 { from: v4 }
+    }
+
+    pub fn to_v6(self) -> CompatV5ToV6 {
+        CompatV5ToV6::Compat(self)
+    }
+
+    pub fn version(&self) -> crate::Version {
+        self.from.version()
+    }
+
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        self.from.date()
+    }
+
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        self.from.instance_uid()
+    }
+
+    pub fn indexes(&self) -> Result<impl Iterator<Item = Result<CompatIndexV4ToV5>> + '_> {
+        Ok(self.from.indexes()?.map(|index_reader| -> Result<_> {
+            let compat = CompatIndexV4ToV5::new(index_reader?);
+            Ok(compat)
+        }))
+    }
+
+    pub fn tasks(
+        &mut self,
+    ) -> Box<dyn Iterator<Item = Result<(v5::Task, Option<v5::UpdateFile>)>> + '_> {
+        Box::new(self.from.tasks().map(|task| {
+            task.map(|(task, content_file)| {
+                // let task_view: v4::tasks::TaskView = task.into();
+
+                let task = v5::Task {
+                    id: task.id,
+                    content: match task.content {
+                        v4::tasks::TaskContent::DocumentAddition {
+                            content_uuid,
+                            merge_strategy,
+                            primary_key,
+                            documents_count,
+                            allow_index_creation,
+                        } => v5::tasks::TaskContent::DocumentAddition {
+                            index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            content_uuid,
+                            merge_strategy: match merge_strategy {
+                                v4::tasks::IndexDocumentsMethod::ReplaceDocuments => {
+                                    v5::tasks::IndexDocumentsMethod::ReplaceDocuments
+                                }
+                                v4::tasks::IndexDocumentsMethod::UpdateDocuments => {
+                                    v5::tasks::IndexDocumentsMethod::UpdateDocuments
+                                }
+                            },
+                            primary_key,
+                            documents_count,
+                            allow_index_creation,
+                        },
+                        v4::tasks::TaskContent::DocumentDeletion(deletion) => {
+                            v5::tasks::TaskContent::DocumentDeletion {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                deletion: match deletion {
+                                    v4::tasks::DocumentDeletion::Clear => {
+                                        v5::tasks::DocumentDeletion::Clear
+                                    }
+                                    v4::tasks::DocumentDeletion::Ids(ids) => {
+                                        v5::tasks::DocumentDeletion::Ids(ids)
+                                    }
+                                },
+                            }
+                        }
+                        v4::tasks::TaskContent::SettingsUpdate {
+                            settings,
+                            is_deletion,
+                            allow_index_creation,
+                        } => v5::tasks::TaskContent::SettingsUpdate {
+                            index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            settings: settings.into(),
+                            is_deletion,
+                            allow_index_creation,
+                        },
+                        v4::tasks::TaskContent::IndexDeletion => {
+                            v5::tasks::TaskContent::IndexDeletion {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                            }
+                        }
+                        v4::tasks::TaskContent::IndexCreation { primary_key } => {
+                            v5::tasks::TaskContent::IndexCreation {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                primary_key,
+                            }
+                        }
+                        v4::tasks::TaskContent::IndexUpdate { primary_key } => {
+                            v5::tasks::TaskContent::IndexUpdate {
+                                index_uid: v5::meta::IndexUid(task.index_uid.0),
+                                primary_key,
+                            }
+                        }
+                    },
+                    events: task
+                        .events
+                        .into_iter()
+                        .map(|event| match event {
+                            v4::tasks::TaskEvent::Created(date) => {
+                                v5::tasks::TaskEvent::Created(date)
+                            }
+                            v4::tasks::TaskEvent::Batched {
+                                timestamp,
+                                batch_id,
+                            } => v5::tasks::TaskEvent::Batched {
+                                timestamp,
+                                batch_id,
+                            },
+                            v4::tasks::TaskEvent::Processing(date) => {
+                                v5::tasks::TaskEvent::Processing(date)
+                            }
+                            v4::tasks::TaskEvent::Succeded { result, timestamp } => {
+                                v5::tasks::TaskEvent::Succeeded {
+                                    result: match result {
+                                        v4::tasks::TaskResult::DocumentAddition {
+                                            indexed_documents,
+                                        } => v5::tasks::TaskResult::DocumentAddition {
+                                            indexed_documents,
+                                        },
+                                        v4::tasks::TaskResult::DocumentDeletion {
+                                            deleted_documents,
+                                        } => v5::tasks::TaskResult::DocumentDeletion {
+                                            deleted_documents,
+                                        },
+                                        v4::tasks::TaskResult::ClearAll { deleted_documents } => {
+                                            v5::tasks::TaskResult::ClearAll { deleted_documents }
+                                        }
+                                        v4::tasks::TaskResult::Other => {
+                                            v5::tasks::TaskResult::Other
+                                        }
+                                    },
+                                    timestamp,
+                                }
+                            }
+                            v4::tasks::TaskEvent::Failed { error, timestamp } => {
+                                v5::tasks::TaskEvent::Failed {
+                                    error: v5::ResponseError::from(error),
+                                    timestamp,
+                                }
+                            }
+                        })
+                        .collect(),
+                };
+
+                (task, content_file)
+            })
+        }))
+    }
+
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v5::Key>> + '_> {
+        Box::new(self.from.keys().map(|key| {
+            key.map(|key| v5::Key {
+                description: key.description,
+                name: None,
+                uid: v5::keys::KeyId::new_v4(),
+                actions: key
+                    .actions
+                    .into_iter()
+                    .filter_map(|action| action.into())
+                    .collect(),
+                indexes: key
+                    .indexes
+                    .into_iter()
+                    .map(|index| match index.as_str() {
+                        "*" => v5::StarOr::Star,
+                        _ => v5::StarOr::Other(v5::meta::IndexUid(index)),
+                    })
+                    .collect(),
+                expires_at: key.expires_at,
+                created_at: key.created_at,
+                updated_at: key.updated_at,
+            })
+        }))
+    }
+}
+
+pub struct CompatIndexV4ToV5 {
+    from: v4::V4IndexReader,
+}
+
+impl CompatIndexV4ToV5 {
+    pub fn new(v4: v4::V4IndexReader) -> CompatIndexV4ToV5 {
+        CompatIndexV4ToV5 { from: v4 }
+    }
+
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        self.from.metadata()
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<v5::Document>> + '_>> {
+        self.from
+            .documents()
+            .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v5::Document>> + '_>)
+    }
+
+    pub fn settings(&mut self) -> Result<v5::Settings<v5::Checked>> {
+        Ok(v5::Settings::<v5::Unchecked>::from(self.from.settings()?).check())
+    }
+}
+
+impl<T> From<v4::Setting<T>> for v5::Setting<T> {
+    fn from(setting: v4::Setting<T>) -> Self {
+        match setting {
+            v4::Setting::Set(t) => v5::Setting::Set(t),
+            v4::Setting::Reset => v5::Setting::Reset,
+            v4::Setting::NotSet => v5::Setting::NotSet,
+        }
+    }
+}
+
+impl From<v4::ResponseError> for v5::ResponseError {
+    fn from(error: v4::ResponseError) -> Self {
+        let code = match error.error_code.as_ref() {
+            "CreateIndex" => v5::Code::CreateIndex,
+            "IndexAlreadyExists" => v5::Code::IndexAlreadyExists,
+            "IndexNotFound" => v5::Code::IndexNotFound,
+            "InvalidIndexUid" => v5::Code::InvalidIndexUid,
+            "InvalidMinWordLengthForTypo" => v5::Code::InvalidMinWordLengthForTypo,
+            "InvalidState" => v5::Code::InvalidState,
+            "MissingPrimaryKey" => v5::Code::MissingPrimaryKey,
+            "PrimaryKeyAlreadyPresent" => v5::Code::PrimaryKeyAlreadyPresent,
+            "MaxFieldsLimitExceeded" => v5::Code::MaxFieldsLimitExceeded,
+            "MissingDocumentId" => v5::Code::MissingDocumentId,
+            "InvalidDocumentId" => v5::Code::InvalidDocumentId,
+            "Filter" => v5::Code::Filter,
+            "Sort" => v5::Code::Sort,
+            "BadParameter" => v5::Code::BadParameter,
+            "BadRequest" => v5::Code::BadRequest,
+            "DatabaseSizeLimitReached" => v5::Code::DatabaseSizeLimitReached,
+            "DocumentNotFound" => v5::Code::DocumentNotFound,
+            "Internal" => v5::Code::Internal,
+            "InvalidGeoField" => v5::Code::InvalidGeoField,
+            "InvalidRankingRule" => v5::Code::InvalidRankingRule,
+            "InvalidStore" => v5::Code::InvalidStore,
+            "InvalidToken" => v5::Code::InvalidToken,
+            "MissingAuthorizationHeader" => v5::Code::MissingAuthorizationHeader,
+            "NoSpaceLeftOnDevice" => v5::Code::NoSpaceLeftOnDevice,
+            "DumpNotFound" => v5::Code::DumpNotFound,
+            "TaskNotFound" => v5::Code::TaskNotFound,
+            "PayloadTooLarge" => v5::Code::PayloadTooLarge,
+            "RetrieveDocument" => v5::Code::RetrieveDocument,
+            "SearchDocuments" => v5::Code::SearchDocuments,
+            "UnsupportedMediaType" => v5::Code::UnsupportedMediaType,
+            "DumpAlreadyInProgress" => v5::Code::DumpAlreadyInProgress,
+            "DumpProcessFailed" => v5::Code::DumpProcessFailed,
+            "InvalidContentType" => v5::Code::InvalidContentType,
+            "MissingContentType" => v5::Code::MissingContentType,
+            "MalformedPayload" => v5::Code::MalformedPayload,
+            "MissingPayload" => v5::Code::MissingPayload,
+            "ApiKeyNotFound" => v5::Code::ApiKeyNotFound,
+            "MissingParameter" => v5::Code::MissingParameter,
+            "InvalidApiKeyActions" => v5::Code::InvalidApiKeyActions,
+            "InvalidApiKeyIndexes" => v5::Code::InvalidApiKeyIndexes,
+            "InvalidApiKeyExpiresAt" => v5::Code::InvalidApiKeyExpiresAt,
+            "InvalidApiKeyDescription" => v5::Code::InvalidApiKeyDescription,
+            other => {
+                log::warn!("Unknown error code {}", other);
+                v5::Code::UnretrievableErrorCode
+            }
+        };
+        v5::ResponseError::from_msg(error.message, code)
+    }
+}
+
+impl<T> From<v4::Settings<T>> for v5::Settings<v5::Unchecked> {
+    fn from(settings: v4::Settings<T>) -> Self {
+        v5::Settings {
+            displayed_attributes: settings.displayed_attributes.into(),
+            searchable_attributes: settings.searchable_attributes.into(),
+            filterable_attributes: settings.filterable_attributes.into(),
+            sortable_attributes: settings.sortable_attributes.into(),
+            ranking_rules: settings.ranking_rules.into(),
+            stop_words: settings.stop_words.into(),
+            synonyms: settings.synonyms.into(),
+            distinct_attribute: settings.distinct_attribute.into(),
+            typo_tolerance: match settings.typo_tolerance {
+                v4::Setting::Set(typo) => v5::Setting::Set(v5::TypoTolerance {
+                    enabled: typo.enabled.into(),
+                    min_word_size_for_typos: match typo.min_word_size_for_typos {
+                        v4::Setting::Set(t) => v5::Setting::Set(v5::MinWordSizeForTypos {
+                            one_typo: t.one_typo.into(),
+                            two_typos: t.two_typos.into(),
+                        }),
+                        v4::Setting::Reset => v5::Setting::Reset,
+                        v4::Setting::NotSet => v5::Setting::NotSet,
+                    },
+                    disable_on_words: typo.disable_on_words.into(),
+                    disable_on_attributes: typo.disable_on_attributes.into(),
+                }),
+                v4::Setting::Reset => v5::Setting::Reset,
+                v4::Setting::NotSet => v5::Setting::NotSet,
+            },
+            faceting: v5::Setting::NotSet,
+            pagination: v5::Setting::NotSet,
+            _kind: std::marker::PhantomData,
+        }
+    }
+}
+
+impl From<v4::Action> for Option<v5::Action> {
+    fn from(key: v4::Action) -> Self {
+        match key {
+            v4::Action::All => Some(v5::Action::All),
+            v4::Action::Search => Some(v5::Action::Search),
+            v4::Action::DocumentsAdd => Some(v5::Action::DocumentsAdd),
+            v4::Action::DocumentsGet => Some(v5::Action::DocumentsGet),
+            v4::Action::DocumentsDelete => Some(v5::Action::DocumentsDelete),
+            v4::Action::IndexesAdd => Some(v5::Action::IndexesAdd),
+            v4::Action::IndexesGet => Some(v5::Action::IndexesGet),
+            v4::Action::IndexesUpdate => Some(v5::Action::IndexesUpdate),
+            v4::Action::IndexesDelete => Some(v5::Action::IndexesDelete),
+            v4::Action::TasksGet => Some(v5::Action::TasksGet),
+            v4::Action::SettingsGet => Some(v5::Action::SettingsGet),
+            v4::Action::SettingsUpdate => Some(v5::Action::SettingsUpdate),
+            v4::Action::StatsGet => Some(v5::Action::StatsGet),
+            v4::Action::DumpsCreate => Some(v5::Action::DumpsCreate),
+            v4::Action::DumpsGet => None,
+            v4::Action::Version => Some(v5::Action::Version),
+        }
+    }
+}
+
+#[cfg(test)]
+pub(crate) mod test {
+    use std::{fs::File, io::BufReader};
+
+    use flate2::bufread::GzDecoder;
+    use tempfile::TempDir;
+
+    use super::*;
+
+    #[test]
+    fn compat_v4_v5() {
+        let dump = File::open("tests/assets/v4.dump").unwrap();
+        let dir = TempDir::new().unwrap();
+        let mut dump = BufReader::new(dump);
+        let gz = GzDecoder::new(&mut dump);
+        let mut archive = tar::Archive::new(gz);
+        archive.unpack(dir.path()).unwrap();
+
+        let mut dump = v4::V4Reader::open(dir).unwrap().to_v5();
+
+        // top level infos
+        insta::assert_display_snapshot!(dump.date().unwrap(), @"2022-10-04 15:55:10.344982459 +00:00:00");
+        insta::assert_display_snapshot!(dump.instance_uid().unwrap().unwrap(), @"9e15e977-f2ae-4761-943f-1eaf75fd736d");
+
+        // tasks
+        let tasks = dump.tasks().collect::<Result<Vec<_>>>().unwrap();
+        let (tasks, update_files): (Vec<_>, Vec<_>) = tasks.into_iter().unzip();
+        insta::assert_json_snapshot!(tasks);
+        assert_eq!(update_files.len(), 22);
+        assert!(update_files[0].is_none()); // the dump creation
+        assert!(update_files[1].is_some()); // the enqueued document addition
+        assert!(update_files[2..].iter().all(|u| u.is_none())); // everything already processed
+
+        // keys
+        let keys = dump.keys().collect::<Result<Vec<_>>>().unwrap();
+        insta::assert_json_snapshot!(keys);
+
+        // indexes
+        let mut indexes = dump.indexes().unwrap().collect::<Result<Vec<_>>>().unwrap();
+        // the index are not ordered in any way by default
+        indexes.sort_by_key(|index| index.metadata().uid.to_string());
+
+        let mut products = indexes.pop().unwrap();
+        let mut movies = indexes.pop().unwrap();
+        let mut spells = indexes.pop().unwrap();
+        assert!(indexes.is_empty());
+
+        // products
+        insta::assert_json_snapshot!(products.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "products",
+          "primaryKey": "sku",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_debug_snapshot!(products.settings());
+        let documents = products
+            .documents()
+            .unwrap()
+            .collect::<Result<Vec<_>>>()
+            .unwrap();
+        assert_eq!(documents.len(), 10);
+        insta::assert_json_snapshot!(documents);
+
+        // movies
+        insta::assert_json_snapshot!(movies.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "movies",
+          "primaryKey": "id",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_debug_snapshot!(movies.settings());
+        let documents = movies
+            .documents()
+            .unwrap()
+            .collect::<Result<Vec<_>>>()
+            .unwrap();
+        assert_eq!(documents.len(), 200);
+        insta::assert_debug_snapshot!(documents);
+
+        // spells
+        insta::assert_json_snapshot!(spells.metadata(), { ".createdAt" => "[now]", ".updatedAt" => "[now]" }, @r###"
+        {
+          "uid": "dnd_spells",
+          "primaryKey": "index",
+          "createdAt": "[now]",
+          "updatedAt": "[now]"
+        }
+        "###);
+
+        insta::assert_debug_snapshot!(spells.settings());
+        let documents = spells
+            .documents()
+            .unwrap()
+            .collect::<Result<Vec<_>>>()
+            .unwrap();
+        assert_eq!(documents.len(), 10);
+        insta::assert_json_snapshot!(documents);
+    }
+}

dump/src/reader/compat/v5_to_v6.rs

@@ -1,46 +1,65 @@
 use crate::reader::{v5, v6, DumpReader, IndexReader};
 use crate::Result;
 
-pub struct CompatV5ToV6 {
-    from: v5::V5Reader,
+use super::v4_to_v5::{CompatIndexV4ToV5, CompatV4ToV5};
+
+pub enum CompatV5ToV6 {
+    V5(v5::V5Reader),
+    Compat(CompatV4ToV5),
 }
 
 impl CompatV5ToV6 {
-    pub fn new(v5: v5::V5Reader) -> CompatV5ToV6 {
-        CompatV5ToV6 { from: v5 }
-    }
-}
-
-impl DumpReader for CompatV5ToV6 {
-    fn version(&self) -> crate::Version {
-        self.from.version()
+    pub fn new_v5(v5: v5::V5Reader) -> CompatV5ToV6 {
+        CompatV5ToV6::V5(v5)
     }
 
-    fn date(&self) -> Option<time::OffsetDateTime> {
-        self.from.date()
+    pub fn version(&self) -> crate::Version {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.version(),
+            CompatV5ToV6::Compat(compat) => compat.version(),
+        }
     }
 
-    fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
-        self.from.instance_uid()
+    pub fn date(&self) -> Option<time::OffsetDateTime> {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.date(),
+            CompatV5ToV6::Compat(compat) => compat.date(),
+        }
     }
 
-    fn indexes(
-        &self,
-    ) -> Result<Box<dyn Iterator<Item = Result<Box<dyn crate::reader::IndexReader + '_>>> + '_>>
-    {
-        Ok(Box::new(self.from.indexes()?.map(
-            |index_reader| -> Result<_> {
-                let compat = Box::new(CompatIndexV5ToV6::new(index_reader?))
-                    as Box<dyn crate::reader::IndexReader + '_>;
-                Ok(compat)
-            },
-        )))
+    pub fn instance_uid(&self) -> Result<Option<uuid::Uuid>> {
+        match self {
+            CompatV5ToV6::V5(v5) => v5.instance_uid(),
+            CompatV5ToV6::Compat(compat) => compat.instance_uid(),
+        }
     }
 
-    fn tasks(
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>> {
+        let indexes = match self {
+            CompatV5ToV6::V5(v5) => Box::new(
+                v5.indexes()?
+                    .map(|index| index.map(CompatIndexV5ToV6::from)),
+            )
+                as Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>,
+
+            CompatV5ToV6::Compat(compat) => Box::new(
+                compat
+                    .indexes()?
+                    .map(|index| index.map(CompatIndexV5ToV6::from)),
+            )
+                as Box<dyn Iterator<Item = Result<CompatIndexV5ToV6>> + '_>,
+        };
+        Ok(indexes)
+    }
+
+    pub fn tasks(
         &mut self,
     ) -> Box<dyn Iterator<Item = Result<(v6::Task, Option<v6::UpdateFile>)>> + '_> {
-        Box::new(self.from.tasks().map(|task| {
+        let tasks = match self {
+            CompatV5ToV6::V5(v5) => v5.tasks(),
+            CompatV5ToV6::Compat(compat) => compat.tasks(),
+        };
+        Box::new(tasks.map(|task| {
             task.map(|(task, content_file)| {
                 let task_view: v5::tasks::TaskView = task.into();
 
@@ -101,8 +120,12 @@ impl DumpReader for CompatV5ToV6 {
         }))
     }
 
-    fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v6::Key>> + '_> {
-        Box::new(self.from.keys().map(|key| {
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<v6::Key>> + '_> {
+        let keys = match self {
+            CompatV5ToV6::V5(v5) => v5.keys(),
+            CompatV5ToV6::Compat(compat) => compat.keys(),
+        };
+        Box::new(keys.map(|key| {
             key.map(|key| v6::Key {
                 description: key.description,
                 name: key.name,
@@ -130,29 +153,51 @@ impl DumpReader for CompatV5ToV6 {
     }
 }
 
-pub struct CompatIndexV5ToV6 {
-    from: v5::V5IndexReader,
+pub enum CompatIndexV5ToV6 {
+    V5(v5::V5IndexReader),
+    Compat(CompatIndexV4ToV5),
+}
+
+impl From<v5::V5IndexReader> for CompatIndexV5ToV6 {
+    fn from(index_reader: v5::V5IndexReader) -> Self {
+        Self::V5(index_reader)
+    }
+}
+
+impl From<CompatIndexV4ToV5> for CompatIndexV5ToV6 {
+    fn from(index_reader: CompatIndexV4ToV5) -> Self {
+        Self::Compat(index_reader)
+    }
 }
 
 impl CompatIndexV5ToV6 {
-    pub fn new(v5: v5::V5IndexReader) -> CompatIndexV5ToV6 {
-        CompatIndexV5ToV6 { from: v5 }
-    }
-}
-
-impl IndexReader for CompatIndexV5ToV6 {
-    fn metadata(&self) -> &crate::IndexMetadata {
-        self.from.metadata()
+    pub fn new_v5(v5: v5::V5IndexReader) -> CompatIndexV5ToV6 {
+        CompatIndexV5ToV6::V5(v5)
     }
 
-    fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<v6::Document>> + '_>> {
-        self.from
+    pub fn metadata(&self) -> &crate::IndexMetadata {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => v5.metadata(),
+            CompatIndexV5ToV6::Compat(compat) => compat.metadata(),
+        }
+    }
+
+    pub fn documents(&mut self) -> Result<Box<dyn Iterator<Item = Result<v6::Document>> + '_>> {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => v5
                 .documents()
-            .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v6::Document>> + '_>)
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v6::Document>> + '_>),
+            CompatIndexV5ToV6::Compat(compat) => compat
+                .documents()
+                .map(|iter| Box::new(iter) as Box<dyn Iterator<Item = Result<v6::Document>> + '_>),
+        }
     }
 
-    fn settings(&mut self) -> Result<v6::Settings<v6::Checked>> {
-        Ok(v6::Settings::<v6::Unchecked>::from(self.from.settings()?).check())
+    pub fn settings(&mut self) -> Result<v6::Settings<v6::Checked>> {
+        match self {
+            CompatIndexV5ToV6::V5(v5) => Ok(v6::Settings::from(v5.settings()?).check()),
+            CompatIndexV5ToV6::Compat(compat) => Ok(v6::Settings::from(compat.settings()?).check()),
+        }
     }
 }
 

dump/src/reader/mod.rs

@@ -13,6 +13,8 @@ use uuid::Uuid;
 // use crate::reader::compat::Compat;
 use crate::{IndexMetadata, Result, Version};
 
+use self::compat::Compat;
+
 // use self::loaders::{v2, v3, v4, v5};
 
 // pub mod error;
@@ -23,7 +25,7 @@ pub(self) mod v4;
 pub(self) mod v5;
 pub(self) mod v6;
 
-pub fn open(dump: impl Read) -> Result<Box<dyn DumpReader>> {
+pub fn open(dump: impl Read) -> Result<Compat> {
     let path = TempDir::new()?;
     let mut dump = BufReader::new(dump);
     let gz = GzDecoder::new(&mut dump);
@@ -44,8 +46,8 @@ pub fn open(dump: impl Read) -> Result<Box<dyn DumpReader>> {
         Version::V2 => todo!(),
         Version::V3 => todo!(),
         Version::V4 => todo!(),
-        Version::V5 => Ok(Box::new(v5::V5Reader::open(path)?.to_v6())),
-        Version::V6 => Ok(Box::new(v6::V6Reader::open(path)?)),
+        Version::V5 => Ok(v5::V5Reader::open(path)?.to_v6().into()),
+        Version::V6 => Ok(v6::V6Reader::open(path)?.into()),
     }
 }
 

dump/src/reader/v4/errors.rs

@@ -0,0 +1,320 @@
+use std::fmt;
+
+use http::StatusCode;
+use serde::{Deserialize, Serialize};
+
+#[derive(Debug, Serialize, Deserialize, Clone, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+#[cfg_attr(feature = "test-traits", derive(proptest_derive::Arbitrary))]
+pub struct ResponseError {
+    #[serde(skip)]
+    #[cfg_attr(
+        feature = "test-traits",
+        proptest(strategy = "strategy::status_code_strategy()")
+    )]
+    pub code: StatusCode,
+    pub message: String,
+    #[serde(rename = "code")]
+    pub error_code: String,
+    #[serde(rename = "type")]
+    pub error_type: String,
+    #[serde(rename = "link")]
+    pub error_link: String,
+}
+
+impl ResponseError {
+    pub fn from_msg(message: String, code: Code) -> Self {
+        Self {
+            code: code.http(),
+            message,
+            error_code: code.err_code().error_name.to_string(),
+            error_type: code.type_(),
+            error_link: code.url(),
+        }
+    }
+}
+
+impl fmt::Display for ResponseError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        self.message.fmt(f)
+    }
+}
+
+impl std::error::Error for ResponseError {}
+
+impl<T> From<T> for ResponseError
+where
+    T: ErrorCode,
+{
+    fn from(other: T) -> Self {
+        Self {
+            code: other.http_status(),
+            message: other.to_string(),
+            error_code: other.error_name(),
+            error_type: other.error_type(),
+            error_link: other.error_url(),
+        }
+    }
+}
+
+pub trait ErrorCode: std::error::Error {
+    fn error_code(&self) -> Code;
+
+    /// returns the HTTP status code ascociated with the error
+    fn http_status(&self) -> StatusCode {
+        self.error_code().http()
+    }
+
+    /// returns the doc url ascociated with the error
+    fn error_url(&self) -> String {
+        self.error_code().url()
+    }
+
+    /// returns error name, used as error code
+    fn error_name(&self) -> String {
+        self.error_code().name()
+    }
+
+    /// return the error type
+    fn error_type(&self) -> String {
+        self.error_code().type_()
+    }
+}
+
+#[allow(clippy::enum_variant_names)]
+enum ErrorType {
+    InternalError,
+    InvalidRequestError,
+    AuthenticationError,
+}
+
+impl fmt::Display for ErrorType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use ErrorType::*;
+
+        match self {
+            InternalError => write!(f, "internal"),
+            InvalidRequestError => write!(f, "invalid_request"),
+            AuthenticationError => write!(f, "auth"),
+        }
+    }
+}
+
+#[derive(Serialize, Deserialize, Debug, Clone, Copy)]
+pub enum Code {
+    // index related error
+    CreateIndex,
+    IndexAlreadyExists,
+    IndexNotFound,
+    InvalidIndexUid,
+    InvalidMinWordLengthForTypo,
+
+    // invalid state error
+    InvalidState,
+    MissingPrimaryKey,
+    PrimaryKeyAlreadyPresent,
+
+    MaxFieldsLimitExceeded,
+    MissingDocumentId,
+    InvalidDocumentId,
+
+    Filter,
+    Sort,
+
+    BadParameter,
+    BadRequest,
+    DatabaseSizeLimitReached,
+    DocumentNotFound,
+    Internal,
+    InvalidGeoField,
+    InvalidRankingRule,
+    InvalidStore,
+    InvalidToken,
+    MissingAuthorizationHeader,
+    NoSpaceLeftOnDevice,
+    DumpNotFound,
+    TaskNotFound,
+    PayloadTooLarge,
+    RetrieveDocument,
+    SearchDocuments,
+    UnsupportedMediaType,
+
+    DumpAlreadyInProgress,
+    DumpProcessFailed,
+
+    InvalidContentType,
+    MissingContentType,
+    MalformedPayload,
+    MissingPayload,
+
+    ApiKeyNotFound,
+    MissingParameter,
+    InvalidApiKeyActions,
+    InvalidApiKeyIndexes,
+    InvalidApiKeyExpiresAt,
+    InvalidApiKeyDescription,
+}
+
+impl Code {
+    /// ascociate a `Code` variant to the actual ErrCode
+    fn err_code(&self) -> ErrCode {
+        use Code::*;
+
+        match self {
+            // index related errors
+            // create index is thrown on internal error while creating an index.
+            CreateIndex => {
+                ErrCode::internal("index_creation_failed", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            IndexAlreadyExists => ErrCode::invalid("index_already_exists", StatusCode::CONFLICT),
+            // thrown when requesting an unexisting index
+            IndexNotFound => ErrCode::invalid("index_not_found", StatusCode::NOT_FOUND),
+            InvalidIndexUid => ErrCode::invalid("invalid_index_uid", StatusCode::BAD_REQUEST),
+
+            // invalid state error
+            InvalidState => ErrCode::internal("invalid_state", StatusCode::INTERNAL_SERVER_ERROR),
+            // thrown when no primary key has been set
+            MissingPrimaryKey => {
+                ErrCode::invalid("primary_key_inference_failed", StatusCode::BAD_REQUEST)
+            }
+            // error thrown when trying to set an already existing primary key
+            PrimaryKeyAlreadyPresent => {
+                ErrCode::invalid("index_primary_key_already_exists", StatusCode::BAD_REQUEST)
+            }
+            // invalid ranking rule
+            InvalidRankingRule => ErrCode::invalid("invalid_ranking_rule", StatusCode::BAD_REQUEST),
+
+            // invalid database
+            InvalidStore => {
+                ErrCode::internal("invalid_store_file", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+
+            // invalid document
+            MaxFieldsLimitExceeded => {
+                ErrCode::invalid("max_fields_limit_exceeded", StatusCode::BAD_REQUEST)
+            }
+            MissingDocumentId => ErrCode::invalid("missing_document_id", StatusCode::BAD_REQUEST),
+            InvalidDocumentId => ErrCode::invalid("invalid_document_id", StatusCode::BAD_REQUEST),
+
+            // error related to filters
+            Filter => ErrCode::invalid("invalid_filter", StatusCode::BAD_REQUEST),
+            // error related to sorts
+            Sort => ErrCode::invalid("invalid_sort", StatusCode::BAD_REQUEST),
+
+            BadParameter => ErrCode::invalid("bad_parameter", StatusCode::BAD_REQUEST),
+            BadRequest => ErrCode::invalid("bad_request", StatusCode::BAD_REQUEST),
+            DatabaseSizeLimitReached => ErrCode::internal(
+                "database_size_limit_reached",
+                StatusCode::INTERNAL_SERVER_ERROR,
+            ),
+            DocumentNotFound => ErrCode::invalid("document_not_found", StatusCode::NOT_FOUND),
+            Internal => ErrCode::internal("internal", StatusCode::INTERNAL_SERVER_ERROR),
+            InvalidGeoField => ErrCode::invalid("invalid_geo_field", StatusCode::BAD_REQUEST),
+            InvalidToken => ErrCode::authentication("invalid_api_key", StatusCode::FORBIDDEN),
+            MissingAuthorizationHeader => {
+                ErrCode::authentication("missing_authorization_header", StatusCode::UNAUTHORIZED)
+            }
+            TaskNotFound => ErrCode::invalid("task_not_found", StatusCode::NOT_FOUND),
+            DumpNotFound => ErrCode::invalid("dump_not_found", StatusCode::NOT_FOUND),
+            NoSpaceLeftOnDevice => {
+                ErrCode::internal("no_space_left_on_device", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            PayloadTooLarge => ErrCode::invalid("payload_too_large", StatusCode::PAYLOAD_TOO_LARGE),
+            RetrieveDocument => {
+                ErrCode::internal("unretrievable_document", StatusCode::BAD_REQUEST)
+            }
+            SearchDocuments => ErrCode::internal("search_error", StatusCode::BAD_REQUEST),
+            UnsupportedMediaType => {
+                ErrCode::invalid("unsupported_media_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+
+            // error related to dump
+            DumpAlreadyInProgress => {
+                ErrCode::invalid("dump_already_processing", StatusCode::CONFLICT)
+            }
+            DumpProcessFailed => {
+                ErrCode::internal("dump_process_failed", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            MissingContentType => {
+                ErrCode::invalid("missing_content_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+            MalformedPayload => ErrCode::invalid("malformed_payload", StatusCode::BAD_REQUEST),
+            InvalidContentType => {
+                ErrCode::invalid("invalid_content_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+            MissingPayload => ErrCode::invalid("missing_payload", StatusCode::BAD_REQUEST),
+
+            // error related to keys
+            ApiKeyNotFound => ErrCode::invalid("api_key_not_found", StatusCode::NOT_FOUND),
+            MissingParameter => ErrCode::invalid("missing_parameter", StatusCode::BAD_REQUEST),
+            InvalidApiKeyActions => {
+                ErrCode::invalid("invalid_api_key_actions", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyIndexes => {
+                ErrCode::invalid("invalid_api_key_indexes", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyExpiresAt => {
+                ErrCode::invalid("invalid_api_key_expires_at", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyDescription => {
+                ErrCode::invalid("invalid_api_key_description", StatusCode::BAD_REQUEST)
+            }
+            InvalidMinWordLengthForTypo => {
+                ErrCode::invalid("invalid_min_word_length_for_typo", StatusCode::BAD_REQUEST)
+            }
+        }
+    }
+
+    /// return the HTTP status code ascociated with the `Code`
+    fn http(&self) -> StatusCode {
+        self.err_code().status_code
+    }
+
+    /// return error name, used as error code
+    fn name(&self) -> String {
+        self.err_code().error_name.to_string()
+    }
+
+    /// return the error type
+    fn type_(&self) -> String {
+        self.err_code().error_type.to_string()
+    }
+
+    /// return the doc url ascociated with the error
+    fn url(&self) -> String {
+        format!("https://docs.meilisearch.com/errors#{}", self.name())
+    }
+}
+
+/// Internal structure providing a convenient way to create error codes
+struct ErrCode {
+    status_code: StatusCode,
+    error_type: ErrorType,
+    error_name: &'static str,
+}
+
+impl ErrCode {
+    fn authentication(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::AuthenticationError,
+        }
+    }
+
+    fn internal(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::InternalError,
+        }
+    }
+
+    fn invalid(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::InvalidRequestError,
+        }
+    }
+}

dump/src/reader/v4/mod.rs

@@ -9,10 +9,11 @@ use tempfile::TempDir;
 use time::OffsetDateTime;
 use uuid::Uuid;
 
-mod keys;
-mod meta;
-mod settings;
-mod tasks;
+pub mod errors;
+pub mod keys;
+pub mod meta;
+pub mod settings;
+pub mod tasks;
 
 use crate::{IndexMetadata, Result, Version};
 
@@ -46,7 +47,7 @@ pub type StarOr<T> = meta::StarOr<T>;
 pub type IndexUid = meta::IndexUid;
 
 // everything related to the errors
-pub type ResponseError = tasks::ResponseError;
+pub type ResponseError = errors::ResponseError;
 pub type Code = meilisearch_types::error::Code;
 
 #[derive(Serialize, Deserialize, Debug)]
@@ -119,8 +120,8 @@ impl V4Reader {
         }))
     }
 
-    pub fn tasks(&mut self) -> impl Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_ {
-        (&mut self.tasks).lines().map(|line| -> Result<_> {
+    pub fn tasks(&mut self) -> Box<dyn Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_> {
+        Box::new((&mut self.tasks).lines().map(|line| -> Result<_> {
             let task: Task = serde_json::from_str(&line?)?;
             if !task.is_finished() {
                 if let Some(uuid) = task.get_content_uuid() {
@@ -137,13 +138,15 @@ impl V4Reader {
             } else {
                 Ok((task, None))
             }
-        })
+        }))
     }
 
-    pub fn keys(&mut self) -> impl Iterator<Item = Result<Key>> + '_ {
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<Key>> + '_> {
+        Box::new(
             (&mut self.keys)
                 .lines()
-            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) })
+                .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }),
+        )
     }
 }
 

dump/src/reader/v4/tasks.rs

@@ -5,6 +5,7 @@ use time::{Duration, OffsetDateTime};
 use uuid::Uuid;
 
 use super::{
+    errors::ResponseError,
     meta::IndexUid,
     settings::{Settings, Unchecked},
 };
@@ -148,19 +149,6 @@ pub enum TaskResult {
     Other,
 }
 
-#[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
-#[cfg_attr(test, derive(serde::Serialize))]
-#[serde(rename_all = "camelCase")]
-pub struct ResponseError {
-    pub message: String,
-    #[serde(rename = "code")]
-    pub error_code: String,
-    #[serde(rename = "type")]
-    pub error_type: String,
-    #[serde(rename = "link")]
-    pub error_link: String,
-}
-
 impl Task {
     /// Return true when a task is finished.
     /// A task is finished when its last state is either `Succeeded` or `Failed`.

dump/src/reader/v5/errors.rs

@@ -0,0 +1,285 @@
+use std::fmt;
+
+use http::StatusCode;
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
+#[serde(rename_all = "camelCase")]
+#[cfg_attr(feature = "test-traits", derive(proptest_derive::Arbitrary))]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub struct ResponseError {
+    #[serde(skip)]
+    code: StatusCode,
+
+    pub message: String,
+    #[serde(rename = "code")]
+    pub error_code: String,
+    #[serde(rename = "type")]
+    pub error_type: String,
+    #[serde(rename = "link")]
+    pub error_link: String,
+}
+
+impl ResponseError {
+    pub fn from_msg(message: String, code: Code) -> Self {
+        Self {
+            code: code.http(),
+            message,
+            error_code: code.err_code().error_name.to_string(),
+            error_type: code.type_(),
+            error_link: code.url(),
+        }
+    }
+}
+
+#[derive(Deserialize, Debug, Clone, Copy)]
+#[cfg_attr(test, derive(serde::Serialize))]
+pub enum Code {
+    // index related error
+    CreateIndex,
+    IndexAlreadyExists,
+    IndexNotFound,
+    InvalidIndexUid,
+    InvalidMinWordLengthForTypo,
+
+    // invalid state error
+    InvalidState,
+    MissingPrimaryKey,
+    PrimaryKeyAlreadyPresent,
+
+    MaxFieldsLimitExceeded,
+    MissingDocumentId,
+    InvalidDocumentId,
+
+    Filter,
+    Sort,
+
+    BadParameter,
+    BadRequest,
+    DatabaseSizeLimitReached,
+    DocumentNotFound,
+    Internal,
+    InvalidGeoField,
+    InvalidRankingRule,
+    InvalidStore,
+    InvalidToken,
+    MissingAuthorizationHeader,
+    NoSpaceLeftOnDevice,
+    DumpNotFound,
+    TaskNotFound,
+    PayloadTooLarge,
+    RetrieveDocument,
+    SearchDocuments,
+    UnsupportedMediaType,
+
+    DumpAlreadyInProgress,
+    DumpProcessFailed,
+
+    InvalidContentType,
+    MissingContentType,
+    MalformedPayload,
+    MissingPayload,
+
+    ApiKeyNotFound,
+    MissingParameter,
+    InvalidApiKeyActions,
+    InvalidApiKeyIndexes,
+    InvalidApiKeyExpiresAt,
+    InvalidApiKeyDescription,
+    InvalidApiKeyName,
+    InvalidApiKeyUid,
+    ImmutableField,
+    ApiKeyAlreadyExists,
+
+    UnretrievableErrorCode,
+}
+
+impl Code {
+    /// associate a `Code` variant to the actual ErrCode
+    fn err_code(&self) -> ErrCode {
+        use Code::*;
+
+        match self {
+            // index related errors
+            // create index is thrown on internal error while creating an index.
+            CreateIndex => {
+                ErrCode::internal("index_creation_failed", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            IndexAlreadyExists => ErrCode::invalid("index_already_exists", StatusCode::CONFLICT),
+            // thrown when requesting an unexisting index
+            IndexNotFound => ErrCode::invalid("index_not_found", StatusCode::NOT_FOUND),
+            InvalidIndexUid => ErrCode::invalid("invalid_index_uid", StatusCode::BAD_REQUEST),
+
+            // invalid state error
+            InvalidState => ErrCode::internal("invalid_state", StatusCode::INTERNAL_SERVER_ERROR),
+            // thrown when no primary key has been set
+            MissingPrimaryKey => {
+                ErrCode::invalid("primary_key_inference_failed", StatusCode::BAD_REQUEST)
+            }
+            // error thrown when trying to set an already existing primary key
+            PrimaryKeyAlreadyPresent => {
+                ErrCode::invalid("index_primary_key_already_exists", StatusCode::BAD_REQUEST)
+            }
+            // invalid ranking rule
+            InvalidRankingRule => ErrCode::invalid("invalid_ranking_rule", StatusCode::BAD_REQUEST),
+
+            // invalid database
+            InvalidStore => {
+                ErrCode::internal("invalid_store_file", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+
+            // invalid document
+            MaxFieldsLimitExceeded => {
+                ErrCode::invalid("max_fields_limit_exceeded", StatusCode::BAD_REQUEST)
+            }
+            MissingDocumentId => ErrCode::invalid("missing_document_id", StatusCode::BAD_REQUEST),
+            InvalidDocumentId => ErrCode::invalid("invalid_document_id", StatusCode::BAD_REQUEST),
+
+            // error related to filters
+            Filter => ErrCode::invalid("invalid_filter", StatusCode::BAD_REQUEST),
+            // error related to sorts
+            Sort => ErrCode::invalid("invalid_sort", StatusCode::BAD_REQUEST),
+
+            BadParameter => ErrCode::invalid("bad_parameter", StatusCode::BAD_REQUEST),
+            BadRequest => ErrCode::invalid("bad_request", StatusCode::BAD_REQUEST),
+            DatabaseSizeLimitReached => ErrCode::internal(
+                "database_size_limit_reached",
+                StatusCode::INTERNAL_SERVER_ERROR,
+            ),
+            DocumentNotFound => ErrCode::invalid("document_not_found", StatusCode::NOT_FOUND),
+            Internal => ErrCode::internal("internal", StatusCode::INTERNAL_SERVER_ERROR),
+            InvalidGeoField => ErrCode::invalid("invalid_geo_field", StatusCode::BAD_REQUEST),
+            InvalidToken => ErrCode::authentication("invalid_api_key", StatusCode::FORBIDDEN),
+            MissingAuthorizationHeader => {
+                ErrCode::authentication("missing_authorization_header", StatusCode::UNAUTHORIZED)
+            }
+            TaskNotFound => ErrCode::invalid("task_not_found", StatusCode::NOT_FOUND),
+            DumpNotFound => ErrCode::invalid("dump_not_found", StatusCode::NOT_FOUND),
+            NoSpaceLeftOnDevice => {
+                ErrCode::internal("no_space_left_on_device", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            PayloadTooLarge => ErrCode::invalid("payload_too_large", StatusCode::PAYLOAD_TOO_LARGE),
+            RetrieveDocument => {
+                ErrCode::internal("unretrievable_document", StatusCode::BAD_REQUEST)
+            }
+            SearchDocuments => ErrCode::internal("search_error", StatusCode::BAD_REQUEST),
+            UnsupportedMediaType => {
+                ErrCode::invalid("unsupported_media_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+
+            // error related to dump
+            DumpAlreadyInProgress => {
+                ErrCode::invalid("dump_already_processing", StatusCode::CONFLICT)
+            }
+            DumpProcessFailed => {
+                ErrCode::internal("dump_process_failed", StatusCode::INTERNAL_SERVER_ERROR)
+            }
+            MissingContentType => {
+                ErrCode::invalid("missing_content_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+            MalformedPayload => ErrCode::invalid("malformed_payload", StatusCode::BAD_REQUEST),
+            InvalidContentType => {
+                ErrCode::invalid("invalid_content_type", StatusCode::UNSUPPORTED_MEDIA_TYPE)
+            }
+            MissingPayload => ErrCode::invalid("missing_payload", StatusCode::BAD_REQUEST),
+
+            // error related to keys
+            ApiKeyNotFound => ErrCode::invalid("api_key_not_found", StatusCode::NOT_FOUND),
+            MissingParameter => ErrCode::invalid("missing_parameter", StatusCode::BAD_REQUEST),
+            InvalidApiKeyActions => {
+                ErrCode::invalid("invalid_api_key_actions", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyIndexes => {
+                ErrCode::invalid("invalid_api_key_indexes", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyExpiresAt => {
+                ErrCode::invalid("invalid_api_key_expires_at", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyDescription => {
+                ErrCode::invalid("invalid_api_key_description", StatusCode::BAD_REQUEST)
+            }
+            InvalidApiKeyName => ErrCode::invalid("invalid_api_key_name", StatusCode::BAD_REQUEST),
+            InvalidApiKeyUid => ErrCode::invalid("invalid_api_key_uid", StatusCode::BAD_REQUEST),
+            ApiKeyAlreadyExists => ErrCode::invalid("api_key_already_exists", StatusCode::CONFLICT),
+            ImmutableField => ErrCode::invalid("immutable_field", StatusCode::BAD_REQUEST),
+            InvalidMinWordLengthForTypo => {
+                ErrCode::invalid("invalid_min_word_length_for_typo", StatusCode::BAD_REQUEST)
+            }
+            UnretrievableErrorCode => {
+                ErrCode::invalid("unretrievable_error_code", StatusCode::BAD_REQUEST)
+            }
+        }
+    }
+
+    /// return the HTTP status code associated with the `Code`
+    fn http(&self) -> StatusCode {
+        self.err_code().status_code
+    }
+
+    /// return error name, used as error code
+    fn name(&self) -> String {
+        self.err_code().error_name.to_string()
+    }
+
+    /// return the error type
+    fn type_(&self) -> String {
+        self.err_code().error_type.to_string()
+    }
+
+    /// return the doc url associated with the error
+    fn url(&self) -> String {
+        format!("https://docs.meilisearch.com/errors#{}", self.name())
+    }
+}
+
+/// Internal structure providing a convenient way to create error codes
+struct ErrCode {
+    status_code: StatusCode,
+    error_type: ErrorType,
+    error_name: &'static str,
+}
+
+impl ErrCode {
+    fn authentication(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::AuthenticationError,
+        }
+    }
+
+    fn internal(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::InternalError,
+        }
+    }
+
+    fn invalid(error_name: &'static str, status_code: StatusCode) -> ErrCode {
+        ErrCode {
+            status_code,
+            error_name,
+            error_type: ErrorType::InvalidRequestError,
+        }
+    }
+}
+
+#[allow(clippy::enum_variant_names)]
+enum ErrorType {
+    InternalError,
+    InvalidRequestError,
+    AuthenticationError,
+}
+
+impl fmt::Display for ErrorType {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        use ErrorType::*;
+
+        match self {
+            InternalError => write!(f, "internal"),
+            InvalidRequestError => write!(f, "invalid_request"),
+            AuthenticationError => write!(f, "auth"),
+        }
+    }
+}

dump/src/reader/v5/mod.rs

@@ -47,6 +47,7 @@ use crate::{IndexMetadata, Result, Version};
 
 use super::{compat::v5_to_v6::CompatV5ToV6, DumpReader, IndexReader};
 
+pub mod errors;
 pub mod keys;
 pub mod meta;
 pub mod settings;
@@ -80,8 +81,8 @@ pub type StarOr<T> = meta::StarOr<T>;
 pub type IndexUid = meta::IndexUid;
 
 // everything related to the errors
-pub type ResponseError = tasks::ResponseError;
-pub type Code = meilisearch_types::error::Code;
+pub type ResponseError = errors::ResponseError;
+pub type Code = errors::Code;
 
 #[derive(Serialize, Deserialize, Debug)]
 #[serde(rename_all = "camelCase")]
@@ -124,7 +125,7 @@ impl V5Reader {
     }
 
     pub fn to_v6(self) -> CompatV5ToV6 {
-        CompatV5ToV6::new(self)
+        CompatV5ToV6::new_v5(self)
     }
 
     pub fn version(&self) -> Version {
@@ -153,8 +154,8 @@ impl V5Reader {
         }))
     }
 
-    pub fn tasks(&mut self) -> impl Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_ {
-        (&mut self.tasks).lines().map(|line| -> Result<_> {
+    pub fn tasks(&mut self) -> Box<dyn Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_> {
+        Box::new((&mut self.tasks).lines().map(|line| -> Result<_> {
             let task: Task = serde_json::from_str(&line?)?;
             if !task.is_finished() {
                 if let Some(uuid) = task.get_content_uuid() {
@@ -171,13 +172,15 @@ impl V5Reader {
             } else {
                 Ok((task, None))
             }
-        })
+        }))
     }
 
-    pub fn keys(&mut self) -> impl Iterator<Item = Result<Key>> + '_ {
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<Key>> + '_> {
+        Box::new(
             (&mut self.keys)
                 .lines()
-            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) })
+                .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }),
+        )
     }
 }
 

dump/src/reader/v5/tasks.rs

@@ -5,6 +5,7 @@ use time::{Duration, OffsetDateTime};
 use uuid::Uuid;
 
 use super::{
+    errors::ResponseError,
     meta::IndexUid,
     settings::{Settings, Unchecked},
 };
@@ -113,19 +114,6 @@ pub enum TaskResult {
     Other,
 }
 
-#[derive(Debug, Deserialize, Clone, PartialEq, Eq)]
-#[cfg_attr(test, derive(serde::Serialize))]
-#[serde(rename_all = "camelCase")]
-pub struct ResponseError {
-    pub message: String,
-    #[serde(rename = "code")]
-    pub error_code: String,
-    #[serde(rename = "type")]
-    pub error_type: String,
-    #[serde(rename = "link")]
-    pub error_link: String,
-}
-
 impl Task {
     /// Return true when a task is finished.
     /// A task is finished when its last state is either `Succeeded` or `Failed`.

dump/src/reader/v6.rs

@@ -68,21 +68,23 @@ impl V6Reader {
             dump,
         })
     }
-    fn version(&self) -> Version {
+
+    pub fn version(&self) -> Version {
         Version::V6
     }
 
-    fn date(&self) -> Option<OffsetDateTime> {
+    pub fn date(&self) -> Option<OffsetDateTime> {
         Some(self.metadata.dump_date)
     }
 
-    fn instance_uid(&self) -> Result<Option<Uuid>> {
+    pub fn instance_uid(&self) -> Result<Option<Uuid>> {
         Ok(Some(self.instance_uid))
     }
 
-    fn indexes(&self) -> Result<impl Iterator<Item = Result<V6IndexReader>> + '_> {
+    pub fn indexes(&self) -> Result<Box<dyn Iterator<Item = Result<V6IndexReader>> + '_>> {
         let entries = fs::read_dir(self.dump.path().join("indexes"))?;
-        Ok(entries
+        Ok(Box::new(
+            entries
                 .map(|entry| -> Result<Option<_>> {
                     let entry = entry?;
                     if entry.file_type()?.is_dir() {
@@ -99,11 +101,12 @@ impl V6Reader {
                         Ok(None)
                     }
                 })
-            .filter_map(|entry| entry.transpose()))
+                .filter_map(|entry| entry.transpose()),
+        ))
     }
 
-    fn tasks(&mut self) -> impl Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_ {
-        (&mut self.tasks).lines().map(|line| -> Result<_> {
+    pub fn tasks(&mut self) -> Box<dyn Iterator<Item = Result<(Task, Option<UpdateFile>)>> + '_> {
+        Box::new((&mut self.tasks).lines().map(|line| -> Result<_> {
             let mut task: index_scheduler::TaskView = serde_json::from_str(&line?)?;
             // TODO: this can be removed once we can `Deserialize` the duration from the `TaskView`.
             if let Some((started_at, finished_at)) = task.started_at.zip(task.finished_at) {
@@ -121,13 +124,15 @@ impl V6Reader {
             } else {
                 Ok((task, None))
             }
-        })
+        }))
     }
 
-    fn keys(&mut self) -> impl Iterator<Item = Result<Key>> + '_ {
+    pub fn keys(&mut self) -> Box<dyn Iterator<Item = Result<Key>> + '_> {
+        Box::new(
             (&mut self.keys)
                 .lines()
-            .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) })
+                .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }),
+        )
     }
 }
 
@@ -165,7 +170,7 @@ impl DumpReader for V6Reader {
     }
 }
 
-struct V6IndexReader {
+pub struct V6IndexReader {
     metadata: IndexMetadata,
     documents: BufReader<File>,
     settings: BufReader<File>,
@@ -184,17 +189,17 @@ impl V6IndexReader {
         Ok(ret)
     }
 
-    fn metadata(&self) -> &IndexMetadata {
+    pub fn metadata(&self) -> &IndexMetadata {
         &self.metadata
     }
 
-    fn documents(&mut self) -> Result<impl Iterator<Item = Result<Document>> + '_> {
+    pub fn documents(&mut self) -> Result<impl Iterator<Item = Result<Document>> + '_> {
         Ok((&mut self.documents)
             .lines()
             .map(|line| -> Result<_> { Ok(serde_json::from_str(&line?)?) }))
     }
 
-    fn settings(&mut self) -> Result<Settings<Checked>> {
+    pub fn settings(&mut self) -> Result<Settings<Checked>> {
         let settings: Settings<Unchecked> = serde_json::from_reader(&mut self.settings)?;
         Ok(settings.check())
     }