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package plugins | |
import ( | |
"context" | |
"encoding/json" | |
"fmt" | |
"os" | |
"strconv" | |
sqlite_vec "github.com/asg017/sqlite-vec-go-bindings/cgo" | |
"github.com/google/generative-ai-go/genai" | |
"github.com/labstack/echo/v5" | |
"github.com/pocketbase/dbx" | |
"github.com/pocketbase/pocketbase" | |
"github.com/pocketbase/pocketbase/apis" | |
"github.com/pocketbase/pocketbase/core" | |
"github.com/pocketbase/pocketbase/models" | |
"github.com/pocketbase/pocketbase/models/schema" | |
"github.com/pocketbase/pocketbase/tools/types" | |
"google.golang.org/api/option" | |
) | |
func VectorStore(app *pocketbase.PocketBase, collections ...string) error { | |
sqlite_vec.Auto() | |
client, err := createGoogleAiClient() | |
if err != nil { | |
return err | |
} | |
app.OnAfterBootstrap().Add(func(e *core.BootstrapEvent) error { | |
for _, target := range collections { | |
collection, _ := app.Dao().FindCollectionByNameOrId(target) | |
if collection == nil { | |
err := createVectorCollection(app, target) | |
if err != nil { | |
return err | |
} | |
} | |
} | |
return nil | |
}) | |
app.OnModelAfterCreate().Add(func(e *core.ModelEvent) error { | |
tbl := e.Model.TableName() | |
for _, target := range collections { | |
if tbl == target { | |
err := modelModify(app, target, client, e) | |
if err != nil { | |
return err | |
} | |
} | |
} | |
return nil | |
}) | |
app.OnModelAfterUpdate().Add(func(e *core.ModelEvent) error { | |
tbl := e.Model.TableName() | |
for _, target := range collections { | |
if tbl == target { | |
err := modelModify(app, target, client, e) | |
if err != nil { | |
return err | |
} | |
} | |
} | |
return nil | |
}) | |
app.OnModelAfterDelete().Add(func(e *core.ModelEvent) error { | |
tbl := e.Model.TableName() | |
for _, target := range collections { | |
if tbl == target { | |
err := modelDelete(app, target, e) | |
if err != nil { | |
return err | |
} | |
} | |
} | |
return nil | |
}) | |
app.OnBeforeServe().Add(func(e *core.ServeEvent) error { | |
group := e.Router.Group("/api/collections/:collectionIdOrName/records", apis.ActivityLogger(app)) | |
group.GET("/vector-search", func(c echo.Context) error { | |
target := c.PathParam("collectionIdOrName") | |
if _, err := app.Dao().FindCollectionByNameOrId(target); err != nil { | |
app.Logger().Error(fmt.Sprint(err)) | |
return err | |
} | |
title := c.QueryParam("title") | |
content := c.QueryParam("content") | |
k := c.QueryParam("k") | |
kNum := 5 | |
if k != "" { | |
val, err := strconv.Atoi(k) | |
if err == nil { | |
kNum = val | |
} | |
} | |
if content == "" { | |
return c.NoContent(204) | |
} | |
vector, err := googleAiEmbedContent(client, genai.TaskTypeRetrievalQuery, title, genai.Text(content)) | |
if err != nil { | |
return err | |
} | |
jsonVec, err := json.Marshal(vector) | |
if err != nil { | |
return err | |
} | |
stmt := "SELECT v.id, distance, v.content, v.created, v.updated " | |
stmt += "FROM " + target + "_embeddings " | |
stmt += "LEFT JOIN " + target + " v ON v.vector_id = " + target + "_embeddings.id " | |
stmt += "WHERE embedding MATCH {:embedding} " | |
stmt += "AND k = {:k};" | |
results := []dbx.NullStringMap{} | |
err = app.Dao().DB(). | |
NewQuery(stmt). | |
Bind(dbx.Params{ | |
"embedding": string(jsonVec), | |
"k": kNum, | |
}). | |
All(&results) | |
if err != nil { | |
app.Logger().Error(fmt.Sprint(err)) | |
return err | |
} | |
app.Logger().Info(fmt.Sprint(results)) | |
c.Response().Header().Set(echo.HeaderContentType, "application/json") | |
items := []map[string]any{} | |
for _, result := range results { | |
m := make(map[string]interface{}) | |
for key := range result { | |
val := result[key] | |
value, err := val.Value() | |
if err != nil || !val.Valid { | |
m[key] = nil | |
} else { | |
m[key] = value | |
} | |
} | |
items = append(items, m) | |
} | |
// TODO: Paging result | |
return c.JSON(200, items) | |
}) | |
return nil | |
}) | |
return nil | |
} | |
func modelDelete(app *pocketbase.PocketBase, target string, e *core.ModelEvent) error { | |
_, err := e.Dao.FindRecordById(e.Model.TableName(), e.Model.GetId()) | |
if err != nil { | |
return err | |
} | |
deleteEmbeddingsForRecord(app, target, e) | |
return nil | |
} | |
func modelModify(app *pocketbase.PocketBase, target string, client *genai.Client, e *core.ModelEvent) error { | |
record, err := e.Dao.FindRecordById(e.Model.TableName(), e.Model.GetId()) | |
if err != nil { | |
return err | |
} | |
title := record.GetString("title") | |
content := record.GetString("content") | |
result, err := googleAiEmbedContent(client, genai.TaskTypeRetrievalDocument, title, genai.Text(content)) | |
if err != nil { | |
return err | |
} | |
vector := "" | |
jsonVec, err := json.Marshal(result) | |
if err != nil { | |
vector = "[]" | |
} else { | |
vector = string(jsonVec) | |
} | |
deleteEmbeddingsForRecord(app, target, e) | |
{ | |
stmt := "INSERT INTO " + target + "_embeddings (embedding) " | |
stmt += "VALUES ({:embedding});" | |
res, err := app.DB().NewQuery(stmt).Bind(dbx.Params{ | |
"embedding": vector, | |
}).Execute() | |
if err != nil { | |
return nil | |
} | |
vectorId, err := res.LastInsertId() | |
if err != nil { | |
return err | |
} | |
record.Set("vector_id", vectorId) | |
} | |
if err := app.Dao().WithoutHooks().SaveRecord(record); err != nil { | |
return err | |
} | |
return nil | |
} | |
func deleteEmbeddingsForRecord(app *pocketbase.PocketBase, target string, e *core.ModelEvent) error { | |
record, err := e.Dao.FindRecordById(e.Model.TableName(), e.Model.GetId()) | |
if err != nil { | |
return err | |
} | |
type Meta struct { | |
Id string `db:"id" json:"id"` | |
} | |
vectorId := record.GetInt("vector_id") | |
items := []*Meta{} | |
stmt := "SELECT id FROM " + target + "_embeddings " | |
stmt += "WHERE id = {:id};" | |
err = app.DB().NewQuery(stmt).Bind(dbx.Params{ | |
"id": vectorId, | |
}).All(&items) | |
if err != nil { | |
return nil | |
} | |
stmt = "DELETE FROM " + target + "_embeddings " | |
stmt += "WHERE id = {:id}" | |
for _, item := range items { | |
_, err = app.DB().NewQuery(stmt).Bind(dbx.Params{ | |
"id": item.Id, | |
}).Execute() | |
if err != nil { | |
return nil | |
} | |
} | |
return nil | |
} | |
func createVectorCollection(app *pocketbase.PocketBase, target string, extraFields ...*schema.SchemaField) error { | |
fields := []*schema.SchemaField{ | |
{ | |
Name: "title", | |
Type: schema.FieldTypeText, | |
}, | |
{ | |
Name: "content", | |
Required: true, | |
Type: schema.FieldTypeText, | |
}, | |
{ | |
Name: "vector_id", | |
Type: schema.FieldTypeNumber, | |
}, | |
} | |
fields = append(fields, extraFields...) | |
collection := &models.Collection{ | |
Name: target, | |
Type: models.CollectionTypeBase, | |
Schema: schema.NewSchema(fields...), | |
Indexes: types.JsonArray[string]{ | |
"CREATE UNIQUE INDEX idx_" + target + " ON " + target + " (title, content, vector_id);", | |
}, | |
} | |
if err := app.Dao().SaveCollection(collection); err != nil { | |
return err | |
} | |
stmt := "CREATE VIRTUAL TABLE IF NOT EXISTS " + target + "_embeddings using vec0( " | |
stmt += " id INTEGER PRIMARY KEY AUTOINCREMENT, " | |
stmt += " embedding float[768] " | |
stmt += ");" | |
_, err := app.DB().NewQuery(stmt).Execute() | |
if err != nil { | |
return nil | |
} | |
return nil | |
} | |
func createGoogleAiClient() (*genai.Client, error) { | |
var apiKey string = os.Getenv("GOOGLE_AI_API_KEY") | |
ctx := context.Background() | |
client, err := genai.NewClient(ctx, option.WithAPIKey(apiKey)) | |
if err != nil { | |
return nil, err | |
} | |
return client, nil | |
} | |
func googleAiEmbedContent(client *genai.Client, taskType genai.TaskType, title string, parts ...genai.Part) ([]float32, error) { | |
ctx := context.Background() | |
model := googleAiEmbeddingModel(client) | |
model.TaskType = taskType | |
res, err := model.EmbedContentWithTitle(ctx, title, parts...) | |
if err != nil { | |
return nil, err | |
} | |
return res.Embedding.Values, nil | |
} | |
func googleAiEmbeddingModel(client *genai.Client) *genai.EmbeddingModel { | |
em := client.EmbeddingModel("text-embedding-004") | |
return em | |
} |
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