1 files changed, 240 insertions, 0 deletions
diff --git a/rag/main.go b/rag/main.go
new file mode 100644
index 0000000..a7084bf
--- /dev/null
+++ b/rag/main.go
@@ -0,0 +1,240 @@
+package rag
+
+import (
+	"bytes"
+	"elefant/config"
+	"elefant/models"
+	"elefant/storage"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"log/slog"
+	"net/http"
+	"os"
+
+	"github.com/neurosnap/sentences/english"
+)
+
+type RAG struct {
+	logger *slog.Logger
+	store  storage.FullRepo
+	cfg    *config.Config
+}
+
+func New(l *slog.Logger, s storage.FullRepo, cfg *config.Config) *RAG {
+	return &RAG{
+		logger: l,
+		store:  s,
+		cfg:    cfg,
+	}
+}
+
+func (r *RAG) LoadRAG(fpath string) error {
+	data, err := os.ReadFile(fpath)
+	if err != nil {
+		return err
+	}
+	r.logger.Info("rag: loaded file", "fp", fpath)
+	fileText := string(data)
+	tokenizer, err := english.NewSentenceTokenizer(nil)
+	if err != nil {
+		return err
+	}
+	sentences := tokenizer.Tokenize(fileText)
+	sents := make([]string, len(sentences))
+	r.logger.Info("rag: sentences", "#", len(sents))
+	for i, s := range sentences {
+		sents[i] = s.Text
+	}
+	// TODO: maybe better to decide batch size based on sentences len
+	var (
+		// TODO: to config
+		workers   = 5
+		batchSize = 200
+		maxChSize = 1000
+		//
+		left     = 0
+		right    = batchSize
+		batchCh  = make(chan map[int][]string, maxChSize)
+		vectorCh = make(chan []models.VectorRow, maxChSize)
+		errCh    = make(chan error, 1)
+		doneCh   = make(chan bool, 1)
+	)
+	if len(sents) < batchSize {
+		batchSize = len(sents)
+	}
+	// fill input channel
+	ctn := 0
+	for {
+		if right > len(sents) {
+			batchCh <- map[int][]string{left: sents[left:]}
+			break
+		}
+		batchCh <- map[int][]string{left: sents[left:right]}
+		left, right = right, right+batchSize
+		ctn++
+	}
+	r.logger.Info("finished batching", "batches#", len(batchCh))
+	for w := 0; w < workers; w++ {
+		go r.batchToVectorHFAsync(len(sents), batchCh, vectorCh, errCh, doneCh)
+	}
+	// write to db
+	return r.writeVectors(vectorCh, doneCh)
+}
+
+func (r *RAG) writeVectors(vectorCh <-chan []models.VectorRow, doneCh <-chan bool) error {
+	for {
+		select {
+		case batch := <-vectorCh:
+			for _, vector := range batch {
+				if err := r.store.WriteVector(&vector); err != nil {
+					return err
+				}
+			}
+			r.logger.Info("wrote batch to db", "size", len(batch))
+		case <-doneCh:
+			r.logger.Info("rag finished")
+			return nil
+		}
+	}
+}
+
+func (r *RAG) batchToVectorHFAsync(limit int, inputCh <-chan map[int][]string,
+	vectorCh chan<- []models.VectorRow, errCh chan error, doneCh chan bool) {
+	r.logger.Info("to vector batches", "batches#", len(inputCh))
+	for {
+		select {
+		case linesMap := <-inputCh:
+			// r.logger.Info("batch from ch")
+			for leftI, v := range linesMap {
+				// r.logger.Info("fetching", "index", leftI)
+				r.fecthEmbHF(v, errCh, vectorCh, fmt.Sprintf("test_%d", leftI))
+				if leftI+200 >= limit { // last batch
+					doneCh <- true
+					return
+				}
+				// r.logger.Info("done feitching", "index", leftI)
+			}
+		case <-doneCh:
+			r.logger.Info("got done")
+			close(errCh)
+			close(doneCh)
+			return
+		case err := <-errCh:
+			r.logger.Error("got an error", "error", err)
+			return
+		}
+	}
+}
+
+func (r *RAG) fecthEmbHF(lines []string, errCh chan error, vectorCh chan<- []models.VectorRow, slug string) {
+	payload, err := json.Marshal(
+		map[string]any{"inputs": lines, "options": map[string]bool{"wait_for_model": true}},
+	)
+	if err != nil {
+		r.logger.Error("failed to marshal payload", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	req, err := http.NewRequest("POST", r.cfg.EmbedURL, bytes.NewReader(payload))
+	if err != nil {
+		r.logger.Error("failed to create new req", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", r.cfg.HFToken))
+	resp, err := http.DefaultClient.Do(req)
+	// nolint
+	// resp, err := httpClient.Post(cfg.EmbedURL, "application/json", bytes.NewReader(payload))
+	if err != nil {
+		r.logger.Error("failed to embedd line", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		r.logger.Error("non 200 resp", "code", resp.StatusCode)
+		return
+		// err = fmt.Errorf("non 200 resp; url: %s; code %d", r.cfg.EmbedURL, resp.StatusCode)
+		// errCh <- err
+		// return
+	}
+	emb := [][]float32{}
+	if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
+		r.logger.Error("failed to embedd line", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	if len(emb) == 0 {
+		r.logger.Error("empty emb")
+		err = errors.New("empty emb")
+		errCh <- err
+		return
+	}
+	vectors := make([]models.VectorRow, len(emb))
+	for i, e := range emb {
+		vector := models.VectorRow{
+			Embeddings: e,
+			RawText:    lines[i],
+			Slug:       slug,
+		}
+		vectors[i] = vector
+	}
+	vectorCh <- vectors
+}
+
+func (r *RAG) LineToVector(line string) ([]float32, error) {
+	// payload, err := json.Marshal(map[string]string{"content": line})
+	lines := []string{line}
+	payload, err := json.Marshal(
+		map[string]any{"inputs": lines, "options": map[string]bool{"wait_for_model": true}},
+	)
+	if err != nil {
+		r.logger.Error("failed to marshal payload", "err:", err.Error())
+		return nil, err
+	}
+	// nolint
+	req, err := http.NewRequest("POST", r.cfg.EmbedURL, bytes.NewReader(payload))
+	if err != nil {
+		r.logger.Error("failed to create new req", "err:", err.Error())
+		return nil, err
+	}
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", r.cfg.HFToken))
+	resp, err := http.DefaultClient.Do(req)
+	// resp, err := req.Post(r.cfg.EmbedURL, "application/json", bytes.NewReader(payload))
+	if err != nil {
+		r.logger.Error("failed to embedd line", "err:", err.Error())
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		err = fmt.Errorf("non 200 resp; code: %v\n", resp.StatusCode)
+		r.logger.Error(err.Error())
+		return nil, err
+	}
+	// emb := models.EmbeddingResp{}
+	emb := [][]float32{}
+	if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
+		r.logger.Error("failed to embedd line", "err:", err.Error())
+		return nil, err
+	}
+	if len(emb) == 0 || len(emb[0]) == 0 {
+		r.logger.Error("empty emb")
+		err = errors.New("empty emb")
+		return nil, err
+	}
+	return emb[0], nil
+}
+
+func (r *RAG) saveLine(topic, line string, emb *models.EmbeddingResp) error {
+	row := &models.VectorRow{
+		Embeddings: emb.Embedding,
+		Slug:       topic,
+		RawText:    line,
+	}
+	return r.store.WriteVector(row)
+}
+
+func (r *RAG) SearchEmb(emb *models.EmbeddingResp) ([]models.VectorRow, error) {
+	return r.store.SearchClosest(emb.Embedding)
+}