janiussyafiq commented on code in PR #13578: URL: https://github.com/apache/apisix/pull/13578#discussion_r3458075366
########## apisix/plugins/ai-cache.lua: ########## @@ -0,0 +1,199 @@ +-- +-- 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 = require("apisix.plugins.ai-cache.schema") +local key_mod = require("apisix.plugins.ai-cache.key") +local redis_util = require("apisix.utils.redis") + +local ngx = ngx +local ngx_null = ngx.null +local ipairs = ipairs +local concat = table.concat + +local CACHE_STATUS_HEADER = "X-AI-Cache-Status" +local CACHE_AGE_HEADER = "X-AI-Cache-Age" +local DEFAULT_TTL = 3600 +local DEFAULT_MAX_BODY = 1048576 + +local _M = { + version = 0.1, + priority = 1035, + name = "ai-cache", + schema = schema, +} + + +function _M.check_schema(conf) + return core.schema.check(schema, conf) +end + + +local function release(conf, red) + local ok, err = red:set_keepalive(conf.redis_keepalive_timeout or 10000, + conf.redis_keepalive_pool or 100) + if not ok then + core.log.warn("ai-cache: failed to set redis keepalive: ", err) + end +end + + +local function serve_hit(conf, ctx, cached) + ctx.ai_cache_status = "HIT" + if conf.cache_headers ~= false then + core.response.set_header(CACHE_STATUS_HEADER, "HIT") + local age = ngx.time() - (cached.created_at or ngx.time()) + core.response.set_header(CACHE_AGE_HEADER, age < 0 and 0 or age) + end + core.response.set_header("Content-Type", "application/json") + return core.response.exit(200, cached.body) +end + + +function _M.access(conf, ctx) + -- Streaming responses are not cached in PR-1 (SSE replay is a later + -- increment). ai-proxy (higher priority) has already classified the + -- request, so bypass before doing any work. + if ctx.var.request_type == "ai_stream" then + ctx.ai_cache_status = "BYPASS" + return + end + + if conf.bypass_on then + for _, rule in ipairs(conf.bypass_on) do + if core.request.header(ctx, rule.header) == rule.equals then + ctx.ai_cache_status = "BYPASS" + return + end + end + end + + local body, err = core.request.get_json_request_body_table() + if not body then + core.log.warn("ai-cache: cannot read request body, bypassing: ", err) + ctx.ai_cache_status = "BYPASS" + return + end + + ctx.ai_cache_key = "ai-cache:l1:" .. key_mod.scope(conf, ctx) + .. ":" .. key_mod.fingerprint(ctx, body) + + local red + red, err = redis_util.new(conf) + if not red then + -- fail-open: never let a cache-backend outage break the request. + core.log.warn("ai-cache: redis unavailable, fail-open as MISS: ", err) + ctx.ai_cache_status = "MISS" + return + end + + local res + res, err = red:get(ctx.ai_cache_key) + release(conf, red) Review Comment: fixed -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
