feat: analysis admin

services/analysis/internal/face/milvus.go

@@ -0,0 +1,191 @@
+package face
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"strings"
+	"sync"
+
+	"lone-services/pkg/utils"
+
+	"github.com/milvus-io/milvus-sdk-go/v2/client"
+	"github.com/milvus-io/milvus-sdk-go/v2/entity"
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+const (
+	collectionName   = "face_vectors"
+	faceVectorField  = "face_vector"
+	faceUserIDField  = "user_id"
+	searchTopK       = 1
+	similarityMin    = float32(0.55)
+	hnswM            = 16
+	hnswEfConstruct  = 200
+	hnswEf           = 64
+	collectionShards = 2
+)
+
+var (
+	milvusMu     sync.RWMutex
+	milvusClient client.Client
+)
+
+func InitMilvus() error {
+	ctx := context.Background()
+	host := utils.GetConfigString("milvus.milvus_host")
+	port := utils.GetConfigString("milvus.milvus_grpc_port")
+	if host == utils.StringEmpty || port == utils.StringEmpty {
+		return fmt.Errorf("milvus config empty")
+	}
+	address := fmt.Sprintf("%s:%s", host, port)
+	c, err := client.NewGrpcClient(ctx, address)
+	if err != nil {
+		return fmt.Errorf("connect milvus %s: %w", address, err)
+	}
+	if err = ensureCollection(ctx, c); err != nil {
+		_ = c.Close()
+		return err
+	}
+	if err = ensureIndex(ctx, c); err != nil {
+		_ = c.Close()
+		return err
+	}
+	if err = c.LoadCollection(ctx, collectionName, false); err != nil {
+		_ = c.Close()
+		return err
+	}
+
+	milvusMu.Lock()
+	if milvusClient != nil {
+		_ = milvusClient.Close()
+	}
+	milvusClient = c
+	milvusMu.Unlock()
+	logx.Infof("milvus connected: %s", address)
+	return nil
+}
+
+func CloseMilvus() {
+	milvusMu.Lock()
+	defer milvusMu.Unlock()
+	if milvusClient != nil {
+		_ = milvusClient.Close()
+		milvusClient = nil
+	}
+}
+
+func getMilvus() client.Client {
+	milvusMu.RLock()
+	defer milvusMu.RUnlock()
+	return milvusClient
+}
+
+func ensureCollection(ctx context.Context, c client.Client) error {
+	has, err := c.HasCollection(ctx, collectionName)
+	if err != nil {
+		return err
+	}
+	if has {
+		return nil
+	}
+	schema := &entity.Schema{
+		CollectionName: collectionName,
+		Description:    "user face vectors (ArcFace 512d)",
+		AutoID:         false,
+		Fields: []*entity.Field{
+			{
+				Name:       faceUserIDField,
+				DataType:   entity.FieldTypeInt64,
+				PrimaryKey: true,
+			},
+			{
+				Name:     faceVectorField,
+				DataType: entity.FieldTypeFloatVector,
+				TypeParams: map[string]string{
+					"dim": fmt.Sprintf("%d", faceEmbeddingDim),
+				},
+			},
+		},
+	}
+	return c.CreateCollection(ctx, schema, int32(collectionShards))
+}
+
+func ensureIndex(ctx context.Context, c client.Client) error {
+	indexes, err := c.DescribeIndex(ctx, collectionName, faceVectorField)
+	if err != nil {
+		if !strings.Contains(err.Error(), "index not found") {
+			return err
+		}
+	} else if len(indexes) > utils.NumberZero {
+		return nil
+	}
+	idx, err := entity.NewIndexHNSW(entity.IP, hnswM, hnswEfConstruct)
+	if err != nil {
+		return err
+	}
+	return c.CreateIndex(ctx, collectionName, faceVectorField, idx, false)
+}
+
+func UpsertFace(userID int64, vector []float32) error {
+	c := getMilvus()
+	if c == nil {
+		return errors.New("milvus client is nil")
+	}
+	if userID < utils.NumberOne || len(vector) != faceEmbeddingDim {
+		return errors.New("invalid face upsert args")
+	}
+	ctx := context.Background()
+	_ = c.Delete(ctx, collectionName, "", fmt.Sprintf("%s == %d", faceUserIDField, userID))
+	_, err := c.Insert(ctx, collectionName, "",
+		entity.NewColumnInt64(faceUserIDField, []int64{userID}),
+		entity.NewColumnFloatVector(faceVectorField, faceEmbeddingDim, [][]float32{vector}),
+	)
+	return err
+}
+
+func SearchUser(vector []float32) (int64, float32, error) {
+	c := getMilvus()
+	if c == nil {
+		return 0, 0, errors.New("milvus client is nil")
+	}
+	if len(vector) != faceEmbeddingDim {
+		return 0, 0, errors.New("invalid face vector")
+	}
+	ctx := context.Background()
+	searchParam, err := entity.NewIndexHNSWSearchParam(hnswEf)
+	if err != nil {
+		return 0, 0, err
+	}
+	result, err := c.Search(
+		ctx,
+		collectionName,
+		nil,
+		"",
+		[]string{faceUserIDField},
+		[]entity.Vector{entity.FloatVector(vector)},
+		faceVectorField,
+		entity.IP,
+		searchTopK,
+		searchParam,
+	)
+	if err != nil {
+		return 0, 0, err
+	}
+	if len(result) == utils.NumberZero || result[0].IDs.Len() == utils.NumberZero {
+		return 0, 0, errors.New("face not found")
+	}
+	ids, ok := result[0].IDs.(*entity.ColumnInt64)
+	if !ok {
+		return 0, 0, errors.New("invalid milvus id column")
+	}
+	userID, err := ids.ValueByIdx(0)
+	if err != nil {
+		return 0, 0, err
+	}
+	score := result[0].Scores[0]
+	if score < similarityMin {
+		return 0, score, errors.New("face similarity too low")
+	}
+	return userID, score, nil
+}