feat(http): accept empty document additions

wip

meilisearch-http/tests/documents/add_documents.rs

@@ -710,20 +710,11 @@ async fn replace_document() {
 }
 
 #[actix_rt::test]
-async fn error_add_no_documents() {
+async fn add_no_documents() {
     let server = Server::new().await;
     let index = server.index("test");
-    let (response, code) = index.add_documents(json!([]), None).await;
-
-    let expected_response = json!({
-        "message": "The `json` payload must contain at least one document.",
-        "code": "malformed_payload",
-        "type": "invalid_request",
-        "link": "https://docs.meilisearch.com/errors#malformed_payload"
-    });
-
-    assert_eq!(response, expected_response);
-    assert_eq!(code, 400);
+    let (_response, code) = index.add_documents(json!([]), None).await;
+    assert_eq!(code, 202);
 }
 
 #[actix_rt::test]

meilisearch-lib/src/document_formats.rs

@@ -32,8 +32,6 @@ pub enum DocumentFormatError {
         Box<dyn std::error::Error + Send + Sync + 'static>,
         PayloadType,
     ),
-    #[error("The `{0}` payload must contain at least one document.")]
-    EmptyPayload(PayloadType),
 }
 
 impl From<(PayloadType, milli::documents::Error)> for DocumentFormatError {
@@ -50,7 +48,6 @@ impl ErrorCode for DocumentFormatError {
         match self {
             DocumentFormatError::Internal(_) => Code::Internal,
             DocumentFormatError::MalformedPayload(_, _) => Code::MalformedPayload,
-            DocumentFormatError::EmptyPayload(_) => Code::MalformedPayload,
         }
     }
 }
@@ -63,10 +60,6 @@ pub fn read_csv(input: impl Read, writer: impl Write + Seek) -> Result<usize> {
     let builder =
         DocumentBatchBuilder::from_csv(input, writer).map_err(|e| (PayloadType::Csv, e))?;
 
-    if builder.len() == 0 {
-        return Err(DocumentFormatError::EmptyPayload(PayloadType::Csv));
-    }
-
     let count = builder.finish().map_err(|e| (PayloadType::Csv, e))?;
 
     Ok(count)
@@ -81,16 +74,17 @@ pub fn read_ndjson(input: impl Read, writer: impl Write + Seek) -> Result<usize>
     let mut buf = String::new();
 
     while reader.read_line(&mut buf)? > 0 {
+        // skip empty lines
+        if buf == "\n" {
+            buf.clear();
+            continue;
+        }
         builder
             .extend_from_json(Cursor::new(&buf.as_bytes()))
             .map_err(|e| (PayloadType::Ndjson, e))?;
         buf.clear();
     }
 
-    if builder.len() == 0 {
-        return Err(DocumentFormatError::EmptyPayload(PayloadType::Ndjson));
-    }
-
     let count = builder.finish().map_err(|e| (PayloadType::Ndjson, e))?;
 
     Ok(count)
@@ -104,10 +98,6 @@ pub fn read_json(input: impl Read, writer: impl Write + Seek) -> Result<usize> {
         .extend_from_json(input)
         .map_err(|e| (PayloadType::Json, e))?;
 
-    if builder.len() == 0 {
-        return Err(DocumentFormatError::EmptyPayload(PayloadType::Json));
-    }
-
     let count = builder.finish().map_err(|e| (PayloadType::Json, e))?;
 
     Ok(count)

meilisearch-lib/src/index/dump.rs

@@ -8,7 +8,7 @@ use indexmap::IndexMap;
 use milli::documents::DocumentBatchReader;
 use serde::{Deserialize, Serialize};
 
-use crate::document_formats::{read_ndjson, DocumentFormatError};
+use crate::document_formats::read_ndjson;
 use crate::index::update_handler::UpdateHandler;
 use crate::index::updates::apply_settings_to_builder;
 
@@ -130,8 +130,8 @@ impl Index {
 
         let empty = match read_ndjson(reader, &mut tmp_doc_file) {
             // if there was no document in the file it's because the index was empty
+            Ok(0) => true,
             Ok(_) => false,
-            Err(DocumentFormatError::EmptyPayload(_)) => true,
             Err(e) => return Err(e.into()),
         };