move queuing to embedding_queue functionality and update embedding provider to include trait items for max tokens per batch"

Co-authored-by: Max <max@zed.dev>

crates/semantic_index/src/embedding_queue.rs

@@ -0,0 +1,140 @@
+use std::{mem, ops::Range, path::PathBuf, sync::Arc, time::SystemTime};
+
+use gpui::AppContext;
+use parking_lot::Mutex;
+use smol::channel;
+
+use crate::{embedding::EmbeddingProvider, parsing::Document, JobHandle};
+
+#[derive(Clone)]
+pub struct FileToEmbed {
+    pub worktree_id: i64,
+    pub path: PathBuf,
+    pub mtime: SystemTime,
+    pub documents: Vec<Document>,
+    pub job_handle: JobHandle,
+}
+
+impl std::fmt::Debug for FileToEmbed {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("FileToEmbed")
+            .field("worktree_id", &self.worktree_id)
+            .field("path", &self.path)
+            .field("mtime", &self.mtime)
+            .field("document", &self.documents)
+            .finish_non_exhaustive()
+    }
+}
+
+impl PartialEq for FileToEmbed {
+    fn eq(&self, other: &Self) -> bool {
+        self.worktree_id == other.worktree_id
+            && self.path == other.path
+            && self.mtime == other.mtime
+            && self.documents == other.documents
+    }
+}
+
+pub struct EmbeddingQueue {
+    embedding_provider: Arc<dyn EmbeddingProvider>,
+    pending_batch: Vec<FileToEmbedFragment>,
+    pending_batch_token_count: usize,
+    finished_files_tx: channel::Sender<FileToEmbed>,
+    finished_files_rx: channel::Receiver<FileToEmbed>,
+}
+
+pub struct FileToEmbedFragment {
+    file: Arc<Mutex<FileToEmbed>>,
+    document_range: Range<usize>,
+}
+
+impl EmbeddingQueue {
+    pub fn new(embedding_provider: Arc<dyn EmbeddingProvider>) -> Self {
+        let (finished_files_tx, finished_files_rx) = channel::unbounded();
+        Self {
+            embedding_provider,
+            pending_batch: Vec::new(),
+            pending_batch_token_count: 0,
+            finished_files_tx,
+            finished_files_rx,
+        }
+    }
+
+    pub fn push(&mut self, file: FileToEmbed, cx: &mut AppContext) {
+        let file = Arc::new(Mutex::new(file));
+
+        self.pending_batch.push(FileToEmbedFragment {
+            file: file.clone(),
+            document_range: 0..0,
+        });
+
+        let mut fragment_range = &mut self.pending_batch.last_mut().unwrap().document_range;
+        for (ix, document) in file.lock().documents.iter().enumerate() {
+            let next_token_count = self.pending_batch_token_count + document.token_count;
+            if next_token_count > self.embedding_provider.max_tokens_per_batch() {
+                let range_end = fragment_range.end;
+                self.flush(cx);
+                self.pending_batch.push(FileToEmbedFragment {
+                    file: file.clone(),
+                    document_range: range_end..range_end,
+                });
+                fragment_range = &mut self.pending_batch.last_mut().unwrap().document_range;
+            }
+
+            fragment_range.end = ix + 1;
+            self.pending_batch_token_count += document.token_count;
+        }
+    }
+
+    pub fn flush(&mut self, cx: &mut AppContext) {
+        let batch = mem::take(&mut self.pending_batch);
+        self.pending_batch_token_count = 0;
+        if batch.is_empty() {
+            return;
+        }
+
+        let finished_files_tx = self.finished_files_tx.clone();
+        let embedding_provider = self.embedding_provider.clone();
+        cx.background().spawn(async move {
+            let mut spans = Vec::new();
+            for fragment in &batch {
+                let file = fragment.file.lock();
+                spans.extend(
+                    file.documents[fragment.document_range.clone()]
+                        .iter()
+                        .map(|d| d.content.clone()),
+                );
+            }
+
+            match embedding_provider.embed_batch(spans).await {
+                Ok(embeddings) => {
+                    let mut embeddings = embeddings.into_iter();
+                    for fragment in batch {
+                        for document in
+                            &mut fragment.file.lock().documents[fragment.document_range.clone()]
+                        {
+                            if let Some(embedding) = embeddings.next() {
+                                document.embedding = embedding;
+                            } else {
+                                //
+                                log::error!("number of embeddings returned different from number of documents");
+                            }
+                        }
+
+                        if let Some(file) = Arc::into_inner(fragment.file) {
+                            finished_files_tx.try_send(file.into_inner()).unwrap();
+                        }
+                    }
+                }
+                Err(error) => {
+                    log::error!("{:?}", error);
+                }
+            }
+        })
+        .detach();
+    }
+
+    pub fn finished_files(&self) -> channel::Receiver<FileToEmbed> {
+        self.finished_files_rx.clone()
+    }
+}