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115 lines
2.5 KiB
Go
115 lines
2.5 KiB
Go
/*
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* Copyright 2025 CloudWeGo Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package redis
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import (
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"context"
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"fmt"
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"strings"
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"sync"
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"github.com/redis/go-redis/v9"
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)
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const (
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RedisPrefix = "eino:doc:"
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IndexName = "vector_index"
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ContentField = "content"
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MetadataField = "metadata"
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VectorField = "content_vector"
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DistanceField = "distance"
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)
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var initOnce sync.Once
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func Init() error {
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var err error
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initOnce.Do(func() {
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err = InitRedisIndex(context.Background(), &Config{
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RedisAddr: "localhost:6379",
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Dimension: 4096,
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})
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})
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return err
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}
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type Config struct {
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RedisAddr string
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Dimension int
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}
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func InitRedisIndex(ctx context.Context, config *Config) (err error) {
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if config.Dimension <= 0 {
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return fmt.Errorf("dimension must be positive")
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}
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client := redis.NewClient(&redis.Options{
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Addr: config.RedisAddr,
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Protocol: 2,
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})
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defer func() {
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if err != nil {
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client.Close()
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}
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}()
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if err = client.Ping(ctx).Err(); err != nil {
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return fmt.Errorf("failed to connect to Redis: %w", err)
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}
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indexName := fmt.Sprintf("%s%s", RedisPrefix, IndexName)
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// 检查是否存在索引
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exists, err := client.Do(ctx, "FT.INFO", indexName).Result()
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if err != nil {
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if !strings.Contains(err.Error(), "Unknown index name") {
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return fmt.Errorf("failed to check if index exists: %w", err)
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}
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err = nil
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} else if exists != nil {
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return nil
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}
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// Create new index
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createIndexArgs := []interface{}{
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"FT.CREATE", indexName,
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"ON", "HASH",
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"PREFIX", "1", RedisPrefix,
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"SCHEMA",
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ContentField, "TEXT",
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MetadataField, "TEXT",
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VectorField, "VECTOR", "FLAT",
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"6",
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"TYPE", "FLOAT32",
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"DIM", config.Dimension,
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"DISTANCE_METRIC", "COSINE",
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}
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if err = client.Do(ctx, createIndexArgs...).Err(); err != nil {
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return fmt.Errorf("failed to create index: %w", err)
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}
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// 验证索引是否创建成功
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if _, err = client.Do(ctx, "FT.INFO", indexName).Result(); err != nil {
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return fmt.Errorf("failed to verify index creation: %w", err)
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}
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return nil
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}
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