janiussyafiq commented on code in PR #13424: URL: https://github.com/apache/apisix/pull/13424#discussion_r3382998848
########## apisix/plugins/ai-cache.lua: ########## @@ -0,0 +1,197 @@ +-- +-- Licensed to the Apache Software Foundation (ASF) under one or more +-- contributor license agreements. See the NOTICE file distributed with +-- this work for additional information regarding copyright ownership. +-- The ASF licenses this file to You under the Apache License, Version 2.0 +-- (the "License"); you may not use this file except in compliance with +-- the License. You may obtain a copy of the License at +-- +-- http://www.apache.org/licenses/LICENSE-2.0 +-- +-- Unless required by applicable law or agreed to in writing, software +-- distributed under the License is distributed on an "AS IS" BASIS, +-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +-- See the License for the specific language governing permissions and +-- limitations under the License. +-- + +local core = require("apisix.core") +local schema_mod = require("apisix.plugins.ai-cache.schema") +local base = require("apisix.plugins.ai-proxy.base") +local key_mod = require("apisix.plugins.ai-cache.key") +local redis = require("apisix.utils.redis") +local rediscluster = require("apisix.utils.rediscluster") +local ngx = ngx +local ngx_timer_at = ngx.timer.at + +local plugin_name = "ai-cache" + +-- Hardcoded in Phase 1a; Phase 1e makes these schema fields. +local STATUS_HEADER = "X-AI-Cache-Status" +local MAX_CACHE_BODY_SIZE = 1048576 -- 1 MiB + + +local function get_client(conf) + if conf.policy == "redis-cluster" then + local cli, err = rediscluster.new(conf, "plugin-ai-cache-redis-cluster-slot-lock") + return cli, err, "cluster" + end + local cli, err = redis.new(conf) + return cli, err, "single" +end + + +local function release(cli, mode, conf) + if mode == "cluster" then + -- rediscluster keeps its own pool + return + end + cli:set_keepalive(conf.redis_keepalive_timeout, conf.redis_keepalive_pool) Review Comment: Addressed in 8b698907 — `release()` now captures the `set_keepalive` return value and logs a warning on failure, matching the pattern in `limit-conn-redis` / `limit-count-redis`. ########## docs/en/latest/plugins/ai-cache.md: ########## @@ -0,0 +1,125 @@ +--- +title: ai-cache +keywords: + - Apache APISIX + - API Gateway + - Plugin + - ai-cache + - AI + - LLM +description: The ai-cache Plugin caches LLM responses and serves them on identical requests, reducing upstream cost and latency. +--- + +<!-- +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# +--> + +<head> + <link rel="canonical" href="https://docs.api7.ai/hub/ai-cache"; /> +</head> + +## Description + +The `ai-cache` Plugin caches responses from LLM services and serves them directly when an identical request arrives again, reducing upstream token cost and response latency. It is used together with the [`ai-proxy`](./ai-proxy.md) or [`ai-proxy-multi`](./ai-proxy-multi.md) Plugin. + +The Plugin computes a SHA-256 cache key from the request and looks it up in Redis before the request is forwarded upstream. On a **hit**, the cached response is returned directly and the upstream is never contacted. On a **miss**, the request is proxied normally and a successful JSON response is written to the cache for subsequent requests. + +This release implements an **exact-match cache** for the `openai-chat` protocol. All `openai-chat`-compatible providers (for example Azure OpenAI, DeepSeek, OpenRouter, Together, vLLM, Ollama) are cached transparently because they share the protocol. + +:::note + +The cache key is currently derived from the **client-sent** request body — operator-side overrides applied by `ai-proxy` (such as a `model` override) are not yet reflected in the key. If a route applies such overrides, flush the cache (or use a dedicated Redis database) before relying on cache correctness. + +::: Review Comment: Addressed in 8b698907 — the plugin doc was rewritten. The note now states the key is derived from the **effective** (post-override) request, so `ai-proxy`/`ai-proxy-multi` overrides are reflected and cannot cause cross-caching. ########## docs/en/latest/plugins/ai-cache.md: ########## @@ -0,0 +1,125 @@ +--- +title: ai-cache +keywords: + - Apache APISIX + - API Gateway + - Plugin + - ai-cache + - AI + - LLM +description: The ai-cache Plugin caches LLM responses and serves them on identical requests, reducing upstream cost and latency. +--- + +<!-- +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. +# The ASF licenses this file to You under the Apache License, Version 2.0 +# (the "License"); you may not use this file except in compliance with +# the License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# +--> + +<head> + <link rel="canonical" href="https://docs.api7.ai/hub/ai-cache"; /> +</head> + +## Description + +The `ai-cache` Plugin caches responses from LLM services and serves them directly when an identical request arrives again, reducing upstream token cost and response latency. It is used together with the [`ai-proxy`](./ai-proxy.md) or [`ai-proxy-multi`](./ai-proxy-multi.md) Plugin. + +The Plugin computes a SHA-256 cache key from the request and looks it up in Redis before the request is forwarded upstream. On a **hit**, the cached response is returned directly and the upstream is never contacted. On a **miss**, the request is proxied normally and a successful JSON response is written to the cache for subsequent requests. + +This release implements an **exact-match cache** for the `openai-chat` protocol. All `openai-chat`-compatible providers (for example Azure OpenAI, DeepSeek, OpenRouter, Together, vLLM, Ollama) are cached transparently because they share the protocol. + +:::note + +The cache key is currently derived from the **client-sent** request body — operator-side overrides applied by `ai-proxy` (such as a `model` override) are not yet reflected in the key. If a route applies such overrides, flush the cache (or use a dedicated Redis database) before relying on cache correctness. + +::: + +## Attributes + +| Name | Type | Required | Default | Valid values | Description | +|----------------------------|-----------------|-----------------------------------|---------|----------------------|------------------------------------------------------------------------------------------------------| +| exact.ttl | integer | False | 3600 | 1 to 2592000 | Time-to-live in seconds for a cached response. | +| policy | string | True | redis | redis, redis-cluster | Backend used to store cached responses. | +| redis_host | string | True when `policy` is `redis` | | | Address of the Redis node. | +| redis_port | integer | False | 6379 | greater than 0 | Port of the Redis node. | +| redis_password | string | False | | | Password for Redis authentication. | +| redis_database | integer | False | 0 | greater than or equal to 0 | Redis database to use when `policy` is `redis`. | +| redis_timeout | integer | False | 1000 | greater than 0 | Redis connection/read/write timeout in milliseconds. | +| redis_cluster_nodes | array[string] | True when `policy` is `redis-cluster` | | | List of Redis cluster node addresses, used when `policy` is `redis-cluster`. | +| redis_cluster_name | string | True when `policy` is `redis-cluster` | | | Name of the Redis cluster, used when `policy` is `redis-cluster`. | +| redis_cluster_ssl | boolean | False | false | | If true, use SSL to connect to the Redis cluster. | +| redis_cluster_ssl_verify | boolean | False | false | | If true, verify the Redis cluster SSL certificate. | Review Comment: Addressed in 8b698907 — the attributes table now documents `redis_username`, `redis_ssl`, `redis_ssl_verify`, `redis_keepalive_timeout`, and `redis_keepalive_pool`. ########## conf/config.yaml.example: ########## @@ -519,6 +520,7 @@ plugins: # plugin list (sorted by priority) - data-mask # priority: 1500 #- error-log-logger # priority: 1091 - proxy-cache # priority: 1085 + - ai-cache # priority: 1086 Review Comment: Addressed — `ai-cache` (1086) is now ordered ahead of `proxy-cache` (1085) in `conf/config.yaml.example` (8b698907), and likewise in `apisix/cli/config.lua` (5a963d98). -- This is an automated message from the Apache Git Service. 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