9902ca3563
后端： 1. 阶段 1.5/1.6 收口 llm-service / rag-service，统一模型出口与检索基础设施入口，清退 backend/infra/llm 与 backend/infra/rag 旧实现； 2. 同步更新相关调用链与微服务迁移计划文档
99 lines
2.0 KiB
Go
99 lines
2.0 KiB
Go
package retrieve
|
||
|
||
import (
|
||
"context"
|
||
"fmt"
|
||
"strings"
|
||
|
||
"github.com/LoveLosita/smartflow/backend/services/rag/core"
|
||
)
|
||
|
||
// VectorRetriever 是通用检索器（embed + vector search）。
|
||
type VectorRetriever struct {
|
||
embedder core.Embedder
|
||
store core.VectorStore
|
||
}
|
||
|
||
func NewVectorRetriever(embedder core.Embedder, store core.VectorStore) *VectorRetriever {
|
||
return &VectorRetriever{
|
||
embedder: embedder,
|
||
store: store,
|
||
}
|
||
}
|
||
|
||
func (r *VectorRetriever) Retrieve(ctx context.Context, req core.RetrieveRequest) (result []core.ScoredChunk, err error) {
|
||
defer func() {
|
||
recovered := recover()
|
||
if recovered == nil {
|
||
return
|
||
}
|
||
err = fmt.Errorf("vector retriever panic recovered: %v", recovered)
|
||
}()
|
||
|
||
if r == nil || r.embedder == nil || r.store == nil {
|
||
return nil, core.ErrNilDependency
|
||
}
|
||
query := strings.TrimSpace(req.Query)
|
||
if query == "" {
|
||
return nil, core.ErrInvalidQuery
|
||
}
|
||
topK := req.TopK
|
||
if topK <= 0 {
|
||
topK = 8
|
||
}
|
||
action := strings.TrimSpace(req.Action)
|
||
if action == "" {
|
||
action = "search"
|
||
}
|
||
|
||
vectors, err := r.embedder.Embed(ctx, []string{query}, action)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
if len(vectors) != 1 {
|
||
return nil, fmt.Errorf("embedding query length mismatch: %d", len(vectors))
|
||
}
|
||
|
||
rows, err := r.store.Search(ctx, core.VectorSearchRequest{
|
||
QueryVector: vectors[0],
|
||
TopK: topK,
|
||
Filter: req.Filter,
|
||
})
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
result = make([]core.ScoredChunk, 0, len(rows))
|
||
for _, row := range rows {
|
||
if row.Score < req.Threshold {
|
||
continue
|
||
}
|
||
result = append(result, core.ScoredChunk{
|
||
ChunkID: row.Row.ID,
|
||
DocumentID: asString(row.Row.Metadata["document_id"]),
|
||
Text: row.Row.Text,
|
||
Score: row.Score,
|
||
Metadata: cloneMap(row.Row.Metadata),
|
||
})
|
||
}
|
||
return result, nil
|
||
}
|
||
|
||
func cloneMap(src map[string]any) map[string]any {
|
||
if len(src) == 0 {
|
||
return map[string]any{}
|
||
}
|
||
dst := make(map[string]any, len(src))
|
||
for k, v := range src {
|
||
dst[k] = v
|
||
}
|
||
return dst
|
||
}
|
||
|
||
func asString(v any) string {
|
||
if v == nil {
|
||
return ""
|
||
}
|
||
return fmt.Sprintf("%v", v)
|
||
}
|