Feat (RAG): tying tui calls to rag funcs [WIP; skip-ci]

RAG itself is annoying to properly implement, plucking sentences with no
context is useless. Also it should not be a part of main package, same
for goes for tui. The number of global vars is absurd.

rag.go

@@ -2,27 +2,209 @@ package main
 
 import (
 	"bytes"
+	"context"
 	"elefant/models"
 	"encoding/json"
+	"errors"
+	"fmt"
+	"net/http"
+	"os"
+
+	"github.com/neurosnap/sentences/english"
 )
 
+func loadRAG(fpath string) error {
+	data, err := os.ReadFile(fpath)
+	if err != nil {
+		return err
+	}
+	fileText := string(data)
+	tokenizer, err := english.NewSentenceTokenizer(nil)
+	if err != nil {
+		return err
+	}
+	sentences := tokenizer.Tokenize(fileText)
+	sents := make([]string, len(sentences))
+	for i, s := range sentences {
+		sents[i] = s.Text
+	}
+	var (
+		// TODO: to config
+		workers   = 5
+		batchSize = 200
+		//
+		left     = 0
+		right    = batchSize
+		batchCh  = make(chan map[int][]string)
+		vectorCh = make(chan []models.VectorRow)
+		errCh    = make(chan error)
+	)
+	if len(sents) < batchSize {
+		batchSize = len(sents)
+	}
+	// fill input channel
+	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
+	}
+	// TODO: cancel complains, replace ctx with done chan
+	ctx, cancel := context.WithCancel(context.Background())
+	for w := 0; w < workers; w++ {
+		go batchToVectorHFAsync(ctx, cancel, len(sents), batchCh, vectorCh, errCh)
+	}
+	// write to db
+	return writeVectors(vectorCh)
+}
+
+func writeVectors(vectorCh <-chan []models.VectorRow) error {
+	for batch := range vectorCh {
+		for _, vector := range batch {
+			if err := store.WriteVector(&vector); err != nil {
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func batchToVectorHFAsync(ctx context.Context, close context.CancelFunc, limit int,
+	inputCh <-chan map[int][]string, vectorCh chan<- []models.VectorRow, errCh chan error) {
+	for {
+		select {
+		case linesMap := <-inputCh:
+			for leftI, v := range linesMap {
+				FecthEmbHF(v, errCh, vectorCh, fmt.Sprintf("test_%d", leftI))
+				if leftI+200 >= limit { // last batch
+					close()
+					return
+				}
+			}
+		case <-ctx.Done():
+			logger.Error("got ctx done")
+			return
+		case err := <-errCh:
+			logger.Error("got an error", "error", err)
+			close()
+			return
+		}
+	}
+}
+
+func 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 {
+		logger.Error("failed to marshal payload", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	req, err := http.NewRequest("POST", cfg.EmbedURL, bytes.NewReader(payload))
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", cfg.HFToken))
+	resp, err := httpClient.Do(req)
+	// nolint
+	// resp, err := httpClient.Post(cfg.EmbedURL, "application/json", bytes.NewReader(payload))
+	if err != nil {
+		logger.Error("failed to embedd line", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		logger.Error("non 200 resp", "code", resp.StatusCode)
+		errCh <- err
+		return
+	}
+	emb := [][]float32{}
+	if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
+		logger.Error("failed to embedd line", "err:", err.Error())
+		errCh <- err
+		return
+	}
+	if len(emb) == 0 {
+		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 batchToVectorHF(lines []string) ([][]float32, error) {
+	payload, err := json.Marshal(
+		map[string]any{"inputs": lines, "options": map[string]bool{"wait_for_model": true}},
+	)
+	if err != nil {
+		logger.Error("failed to marshal payload", "err:", err.Error())
+		return nil, err
+	}
+	req, err := http.NewRequest("POST", cfg.EmbedURL, bytes.NewReader(payload))
+	req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", cfg.HFToken))
+	resp, err := httpClient.Do(req)
+	// nolint
+	// resp, err := httpClient.Post(cfg.EmbedURL, "application/json", bytes.NewReader(payload))
+	if err != nil {
+		logger.Error("failed to embedd line", "err:", err.Error())
+		return nil, err
+	}
+	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		logger.Error("non 200 resp", "code", resp.StatusCode)
+		return nil, err
+	}
+	emb := [][]float32{}
+	if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
+		logger.Error("failed to embedd line", "err:", err.Error())
+		return nil, err
+	}
+	if len(emb) == 0 {
+		logger.Error("empty emb")
+		err = errors.New("empty emb")
+		return nil, err
+	}
+	return emb, nil
+}
+
 func lineToVector(line string) (*models.EmbeddingResp, error) {
 	payload, err := json.Marshal(map[string]string{"content": line})
 	if err != nil {
 		logger.Error("failed to marshal payload", "err:", err.Error())
 		return nil, err
 	}
+	// nolint
 	resp, err := httpClient.Post(cfg.EmbedURL, "application/json", bytes.NewReader(payload))
 	if err != nil {
 		logger.Error("failed to embedd line", "err:", err.Error())
 		return nil, err
 	}
 	defer resp.Body.Close()
+	if resp.StatusCode != 200 {
+		logger.Error("non 200 resp", "code", resp.StatusCode)
+		return nil, err
+	}
 	emb := models.EmbeddingResp{}
 	if err := json.NewDecoder(resp.Body).Decode(&emb); err != nil {
 		logger.Error("failed to embedd line", "err:", err.Error())
 		return nil, err
 	}
+	if len(emb.Embedding) == 0 {
+		logger.Error("empty emb")
+		err = errors.New("empty emb")
+		return nil, err
+	}
 	return &emb, nil
 }
 
@@ -36,5 +218,5 @@ func saveLine(topic, line string, emb *models.EmbeddingResp) error {
 }
 
 func searchEmb(emb *models.EmbeddingResp) (*models.VectorRow, error) {
-	return store.SearchClosest([5120]float32(emb.Embedding))
+	return store.SearchClosest(emb.Embedding)
 }