use super::{Document, VectorStoreError};
use super::document_store::{ChunkDocument, ChunkedDocumentStoreTrait};
use async_trait::async_trait;
use mongodb::{
bson::doc,
options::{ClientOptions},
Client, Collection,
};
use serde::{Deserialize, Serialize};
use std::collections::HashMap;
#[derive(Debug, Clone, Serialize, Deserialize)]
struct MongoParentDoc {
#[serde(rename = "_id")]
id: String,
content: String,
metadata: HashMap<String, String>,
}
#[derive(Debug, Clone, Serialize, Deserialize)]
struct MongoChunkDoc {
#[serde(rename = "_id")]
chunk_id: String,
parent_id: String,
content: String,
segment: i32,
metadata: HashMap<String, String>,
}
impl From<MongoParentDoc> for Document {
fn from(m: MongoParentDoc) -> Self {
Document {
content: m.content,
metadata: m.metadata,
id: Some(m.id),
}
}
}
impl From<Document> for MongoParentDoc {
fn from(d: Document) -> Self {
MongoParentDoc {
id: d.id.clone().unwrap_or_else(|| uuid::Uuid::new_v4().to_string()),
content: d.content,
metadata: d.metadata,
}
}
}
impl From<MongoChunkDoc> for ChunkDocument {
fn from(m: MongoChunkDoc) -> Self {
ChunkDocument {
chunk_id: m.chunk_id,
parent_id: m.parent_id,
content: m.content,
segment: m.segment as usize,
metadata: m.metadata,
}
}
}
impl From<ChunkDocument> for MongoChunkDoc {
fn from(c: ChunkDocument) -> Self {
MongoChunkDoc {
chunk_id: c.chunk_id,
parent_id: c.parent_id,
content: c.content,
segment: c.segment as i32,
metadata: c.metadata,
}
}
}
#[derive(Debug, Clone)]
pub struct MongoStoreConfig {
pub uri: String,
pub database: String,
pub parent_collection: String,
pub chunk_collection: String,
}
impl Default for MongoStoreConfig {
fn default() -> Self {
Self {
uri: "mongodb://localhost:27017".to_string(),
database: "langchainrust".to_string(),
parent_collection: "parent_docs".to_string(),
chunk_collection: "chunks".to_string(),
}
}
}
impl MongoStoreConfig {
pub fn new(uri: impl Into<String>, database: impl Into<String>) -> Self {
Self {
uri: uri.into(),
database: database.into(),
parent_collection: "parent_docs".to_string(),
chunk_collection: "chunks".to_string(),
}
}
pub fn with_collections(mut self, parent: impl Into<String>, chunk: impl Into<String>) -> Self {
self.parent_collection = parent.into();
self.chunk_collection = chunk.into();
self
}
}
pub struct MongoChunkedDocumentStore {
client: Client,
parent_collection: Collection<MongoParentDoc>,
chunk_collection: Collection<MongoChunkDoc>,
}
impl MongoChunkedDocumentStore {
pub async fn new(config: MongoStoreConfig) -> Result<Self, VectorStoreError> {
let client_options = ClientOptions::parse(&config.uri)
.await
.map_err(|e| VectorStoreError::ConnectionError(e.to_string()))?;
let client = Client::with_options(client_options)
.map_err(|e| VectorStoreError::ConnectionError(e.to_string()))?;
let db = client.database(&config.database);
let parent_collection = db.collection(&config.parent_collection);
let chunk_collection = db.collection(&config.chunk_collection);
Ok(Self {
client,
parent_collection,
chunk_collection,
})
}
pub async fn create_indexes(&self) -> Result<(), VectorStoreError> {
self.chunk_collection
.create_index(
mongodb::IndexModel::builder()
.keys(doc! { "parent_id": 1 })
.build(),
None,
)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
Ok(())
}
pub fn client(&self) -> &Client {
&self.client
}
}
#[async_trait]
impl ChunkedDocumentStoreTrait for MongoChunkedDocumentStore {
async fn add_parent_document(
&self,
document: Document,
chunk_size: usize,
) -> Result<(String, Vec<String>), VectorStoreError> {
let parent_id = document.id.clone().unwrap_or_else(|| uuid::Uuid::new_v4().to_string());
let mongo_parent = MongoParentDoc {
id: parent_id.clone(),
content: document.content.clone(),
metadata: document.metadata.clone(),
};
self.parent_collection
.insert_one(mongo_parent, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
let chars: Vec<char> = document.content.chars().collect();
let total_len = chars.len();
let mut chunk_ids = Vec::new();
let mut segment = 0;
let mut start = 0;
while start < total_len {
let end = std::cmp::min(start + chunk_size, total_len);
let chunk_content: String = chars[start..end].iter().collect();
let chunk_id = format!("{}_{}", parent_id, segment);
let mongo_chunk = MongoChunkDoc {
chunk_id: chunk_id.clone(),
parent_id: parent_id.clone(),
content: chunk_content,
segment: segment as i32,
metadata: HashMap::new(),
};
self.chunk_collection
.insert_one(mongo_chunk, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
chunk_ids.push(chunk_id);
segment += 1;
start = end;
}
Ok((parent_id, chunk_ids))
}
async fn add_parent_documents(
&self,
documents: Vec<Document>,
chunk_size: usize,
) -> Result<Vec<(String, Vec<String>)>, VectorStoreError> {
let mut results = Vec::new();
for doc in documents {
let result = self.add_parent_document(doc, chunk_size).await?;
results.push(result);
}
Ok(results)
}
async fn get_parent_document(&self, parent_id: &str) -> Result<Option<Document>, VectorStoreError> {
let result = self.parent_collection
.find_one(doc! { "_id": parent_id }, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
Ok(result.map(|m| m.into()))
}
async fn get_chunk(&self, chunk_id: &str) -> Result<Option<ChunkDocument>, VectorStoreError> {
let result = self.chunk_collection
.find_one(doc! { "_id": chunk_id }, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
Ok(result.map(|m| m.into()))
}
async fn get_chunk_document(&self, chunk_id: &str) -> Result<Option<Document>, VectorStoreError> {
let chunk = self.get_chunk(chunk_id).await?;
Ok(chunk.map(|c| c.to_document()))
}
async fn get_chunks_for_parent(&self, parent_id: &str) -> Result<Vec<ChunkDocument>, VectorStoreError> {
let options = mongodb::options::FindOptions::builder()
.sort(doc! { "segment": 1 })
.build();
let mut cursor = self.chunk_collection
.find(doc! { "parent_id": parent_id }, options)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
let mut chunks = Vec::new();
while cursor.advance().await.map_err(|e| VectorStoreError::StorageError(e.to_string()))? {
let doc = cursor.deserialize_current()
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
chunks.push(doc.into());
}
Ok(chunks)
}
async fn get_chunk_documents_for_parent(&self, parent_id: &str) -> Result<Vec<Document>, VectorStoreError> {
let chunks = self.get_chunks_for_parent(parent_id).await?;
Ok(chunks.into_iter().map(|c| c.to_document()).collect())
}
async fn delete_parent_document(&self, parent_id: &str) -> Result<(), VectorStoreError> {
self.chunk_collection
.delete_many(doc! { "parent_id": parent_id }, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
self.parent_collection
.delete_one(doc! { "_id": parent_id }, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
Ok(())
}
async fn parent_count(&self) -> usize {
self.parent_collection
.count_documents(doc! {}, None)
.await
.unwrap_or(0) as usize
}
async fn chunk_count(&self) -> usize {
self.chunk_collection
.count_documents(doc! {}, None)
.await
.unwrap_or(0) as usize
}
async fn get_all_chunks(&self) -> Result<Vec<ChunkDocument>, VectorStoreError> {
let mut cursor = self.chunk_collection
.find(doc! {}, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
let mut chunks = Vec::new();
while cursor.advance().await.map_err(|e| VectorStoreError::StorageError(e.to_string()))? {
let doc = cursor.deserialize_current()
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
chunks.push(doc.into());
}
Ok(chunks)
}
async fn clear(&self) -> Result<(), VectorStoreError> {
self.parent_collection
.delete_many(doc! {}, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
self.chunk_collection
.delete_many(doc! {}, None)
.await
.map_err(|e| VectorStoreError::StorageError(e.to_string()))?;
Ok(())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_config_creation() {
let config = MongoStoreConfig::new("mongodb://localhost:27017", "test_db");
assert_eq!(config.uri, "mongodb://localhost:27017");
assert_eq!(config.database, "test_db");
}
#[test]
fn test_mongo_parent_doc_conversion() {
let doc = Document::new("test content").with_id("test_id");
let mongo: MongoParentDoc = doc.clone().into();
assert_eq!(mongo.id, "test_id");
assert_eq!(mongo.content, "test content");
let back: Document = mongo.into();
assert_eq!(back.content, "test content");
}
#[test]
fn test_mongo_chunk_doc_conversion() {
let chunk = ChunkDocument::new("chunk_0", "parent_1", "content", 0);
let mongo: MongoChunkDoc = chunk.clone().into();
assert_eq!(mongo.chunk_id, "chunk_0");
assert_eq!(mongo.parent_id, "parent_1");
let back: ChunkDocument = mongo.into();
assert_eq!(back.chunk_id, "chunk_0");
}
}