Add csv deserializer for documents

Cargo.lock

@@ -471,6 +471,7 @@ dependencies = [
  "lazy_static",
  "memchr",
  "regex-automata",
+ "serde",
 ]
 
 [[package]]
@@ -772,6 +773,28 @@ dependencies = [
  "lazy_static",
 ]
 
+[[package]]
+name = "csv"
+version = "1.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "22813a6dc45b335f9bade10bf7271dc477e81113e89eb251a0bc2a8a81c536e1"
+dependencies = [
+ "bstr",
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2466559f260f48ad25fe6317b3c8dac77b5bdb5763ac7d9d6103530663bc90"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "derivative"
 version = "2.2.0"
@@ -1668,6 +1691,7 @@ dependencies = [
  "bytes",
  "chrono",
  "crossbeam-channel",
+ "csv",
  "derivative",
  "either",
  "flate2",

meilisearch-lib/Cargo.toml

@@ -15,6 +15,7 @@ arc-swap = "1.3.2"
 byte-unit = { version = "4.0.12", default-features = false, features = ["std"] }
 bytes = "1.1.0"
 chrono = { version = "0.4.19", features = ["serde"] }
+csv = "1.1.6"
 crossbeam-channel = "0.5.1"
 either = "1.6.1"
 flate2 = "1.0.21"

meilisearch-lib/src/index_controller/updates/csv_documents_iter.rs

@@ -0,0 +1,282 @@
+use super::error::{Result, UpdateLoopError};
+use std::io::{Read, Result as IoResult};
+
+use csv::{Reader as CsvReader, StringRecordsIntoIter};
+use serde_json::{Map, Value};
+
+enum AllowedType {
+    String,
+    Number,
+}
+
+fn parse_csv_header(header: &str) -> (String, AllowedType) {
+    // if there are several separators we only split on the last one.
+    match header.rsplit_once(':') {
+        Some((field_name, field_type)) => match field_type {
+            "string" => (field_name.to_string(), AllowedType::String),
+            "number" => (field_name.to_string(), AllowedType::Number),
+            // if the pattern isn't reconized, we keep the whole field.
+            _otherwise => (header.to_string(), AllowedType::String),
+        },
+        None => (header.to_string(), AllowedType::String),
+    }
+}
+
+pub struct CsvDocumentIter<R>
+where
+    R: Read,
+{
+    documents: StringRecordsIntoIter<R>,
+    headers: Vec<(String, AllowedType)>,
+}
+
+impl<R: Read> CsvDocumentIter<R> {
+    pub fn from_reader(reader: R) -> IoResult<Self> {
+        let mut records = CsvReader::from_reader(reader);
+
+        let headers = records
+            .headers()?
+            .into_iter()
+            .map(parse_csv_header)
+            .collect();
+
+        Ok(Self {
+            documents: records.into_records(),
+            headers,
+        })
+    }
+}
+
+impl<R: Read> Iterator for CsvDocumentIter<R> {
+    type Item = Result<Map<String, Value>>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let csv_document = self.documents.next()?;
+
+        match csv_document {
+            Ok(csv_document) => {
+                let mut document = Map::new();
+
+                for ((field_name, field_type), value) in
+                    self.headers.iter().zip(csv_document.into_iter())
+                {
+                    let parsed_value = (|| match field_type {
+                        AllowedType::Number => value
+                            .parse::<f64>()
+                            .map(Value::from)
+                            .map_err(|e| UpdateLoopError::MalformedPayload(Box::new(e))),
+                        AllowedType::String => Ok(Value::String(value.to_string())),
+                    })();
+
+                    match parsed_value {
+                        Ok(value) => drop(document.insert(field_name.to_string(), value)),
+                        Err(e) => return Some(Err(e)),
+                    }
+                }
+
+                Some(Ok(document))
+            }
+            Err(e) => Some(Err(UpdateLoopError::MalformedPayload(Box::new(e)))),
+        }
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use serde_json::json;
+
+    use super::*;
+
+    #[test]
+    fn simple_csv_document() {
+        let documents = r#"city,country,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city": "Boston",
+                "country": "United States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn coma_in_field() {
+        let documents = r#"city,country,pop
+"Boston","United, States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city": "Boston",
+                "country": "United, States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn quote_in_field() {
+        let documents = r#"city,country,pop
+"Boston","United"" States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city": "Boston",
+                "country": "United\" States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn integer_in_field() {
+        let documents = r#"city,country,pop:number
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city": "Boston",
+                "country": "United States",
+                "pop": 4628910.0,
+            })
+        );
+    }
+
+    #[test]
+    fn float_in_field() {
+        let documents = r#"city,country,pop:number
+"Boston","United States","4628910.01""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city": "Boston",
+                "country": "United States",
+                "pop": 4628910.01,
+            })
+        );
+    }
+
+    #[test]
+    fn several_double_dot_in_header() {
+        let documents = r#"city:love:string,country:state,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city:love": "Boston",
+                "country:state": "United States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn ending_by_double_dot_in_header() {
+        let documents = r#"city:,country,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city:": "Boston",
+                "country": "United States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn starting_by_double_dot_in_header() {
+        let documents = r#":city,country,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                ":city": "Boston",
+                "country": "United States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn starting_by_double_dot_in_header2() {
+        let documents = r#":string,country,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert!(csv_iter.next().unwrap().is_err());
+    }
+
+    #[test]
+    fn double_double_dot_in_header() {
+        let documents = r#"city::string,country,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert_eq!(
+            Value::Object(csv_iter.next().unwrap().unwrap()),
+            json!({
+                "city:": "Boston",
+                "country": "United States",
+                "pop": "4628910",
+            })
+        );
+    }
+
+    #[test]
+    fn bad_type_in_header() {
+        let documents = r#"city,country:number,pop
+"Boston","United States","4628910""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert!(csv_iter.next().unwrap().is_err());
+    }
+
+    #[test]
+    fn bad_column_count1() {
+        let documents = r#"city,country,pop
+"Boston","United States","4628910", "too much""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert!(csv_iter.next().unwrap().is_err());
+    }
+
+    #[test]
+    fn bad_column_count2() {
+        let documents = r#"city,country,pop
+"Boston","United States""#;
+
+        let mut csv_iter = CsvDocumentIter::from_reader(documents.as_bytes()).unwrap();
+
+        assert!(csv_iter.next().unwrap().is_err());
+    }
+}

meilisearch-lib/src/index_controller/updates/error.rs

@@ -25,6 +25,8 @@ pub enum UpdateLoopError {
     FatalUpdateStoreError,
     #[error("{0}")]
     InvalidPayload(#[from] DocumentFormatError),
+    #[error("{0}")]
+    MalformedPayload(Box<dyn Error + Send + Sync + 'static>),
     // TODO: The reference to actix has to go.
     #[error("{0}")]
     PayloadError(#[from] actix_web::error::PayloadError),
@@ -56,12 +58,13 @@ internal_error!(
 impl ErrorCode for UpdateLoopError {
     fn error_code(&self) -> Code {
         match self {
-            UpdateLoopError::UnexistingUpdate(_) => Code::NotFound,
+            Self::UnexistingUpdate(_) => Code::NotFound,
-            UpdateLoopError::Internal(_) => Code::Internal,
+            Self::Internal(_) => Code::Internal,
-            //UpdateLoopError::IndexActor(e) => e.error_code(),
+            //Self::IndexActor(e) => e.error_code(),
-            UpdateLoopError::FatalUpdateStoreError => Code::Internal,
+            Self::FatalUpdateStoreError => Code::Internal,
-            UpdateLoopError::InvalidPayload(_) => Code::BadRequest,
+            Self::InvalidPayload(_) => Code::BadRequest,
-            UpdateLoopError::PayloadError(error) => match error {
+            Self::MalformedPayload(_) => Code::BadRequest,
+            Self::PayloadError(error) => match error {
                 actix_web::error::PayloadError::Overflow => Code::PayloadTooLarge,
                 _ => Code::Internal,
             },

meilisearch-lib/src/index_controller/updates/mod.rs

@@ -1,8 +1,10 @@
+mod csv_documents_iter;
 pub mod error;
 mod message;
 pub mod status;
 pub mod store;
 
+use crate::index_controller::updates::csv_documents_iter::CsvDocumentIter;
 use std::io;
 use std::path::{Path, PathBuf};
 use std::sync::atomic::AtomicBool;
@@ -13,6 +15,7 @@ use async_stream::stream;
 use bytes::Bytes;
 use futures::{Stream, StreamExt};
 use log::trace;
+use milli::documents::DocumentBatchBuilder;
 use milli::update::IndexDocumentsMethod;
 use serde::{Deserialize, Serialize};
 use tokio::sync::mpsc;
@@ -27,7 +30,7 @@ use crate::index_controller::update_file_store::UpdateFileStore;
 use status::UpdateStatus;
 
 use super::index_resolver::HardStateIndexResolver;
-use super::{DocumentAdditionFormat, Update};
+use super::{DocumentAdditionFormat, Payload, Update};
 
 pub type UpdateSender = mpsc::Sender<UpdateMsg>;
 
@@ -222,6 +225,26 @@ impl UpdateLoop {
         Ok(status.into())
     }
 
+    async fn documents_from_csv(&self, payload: Payload) -> Result<Uuid> {
+        let file_store = self.update_file_store.clone();
+        tokio::task::spawn_blocking(move || {
+            let (uuid, mut file) = file_store.new_update().unwrap();
+            let mut builder = DocumentBatchBuilder::new(&mut *file).unwrap();
+
+            let iter = CsvDocumentIter::from_reader(StreamReader::new(payload))?;
+            for doc in iter {
+                let doc = doc?;
+                builder.add_documents(doc).unwrap();
+            }
+            builder.finish().unwrap();
+
+            file.persist();
+
+            Ok(uuid)
+        })
+        .await?
+    }
+
     async fn handle_list_updates(&self, uuid: Uuid) -> Result<Vec<UpdateStatus>> {
         let update_store = self.store.clone();
         tokio::task::spawn_blocking(move || {