[GitHub] [incubator-apisix] agile6v commented on a change in pull request #1153: feature: support for proxy caching plugin based on disk.

[GitBox <gi...@apache.org>]

agile6v commented on a change in pull request #1153: feature: support for proxy caching plugin based on disk.
URL: https://github.com/apache/incubator-apisix/pull/1153#discussion_r385705627
 
 

 ##########
 File path: lua/apisix/plugins/proxy-cache.lua
 ##########
 @@ -0,0 +1,238 @@
+--
+-- 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 tab_insert = table.insert
+local tab_concat = table.concat
+local re_gmatch = ngx.re.gmatch
+local ngx = ngx
+local ipairs = ipairs
+
+local lrucache = core.lrucache.new({
+    ttl = 300, count = 100
+})
+
+local plugin_name = "proxy-cache"
+
+local schema = {
+    type = "object",
+    properties = {
+        cache_zone = {
+            type = "string",
+            minLength = 1
+        },
+        cache_key = {
+            type = "string",
+            minLength = 1
+        },
+        cache_http_status = {
+            type = "array",
+            minItems = 1,
+            items = {
+                description = "http response status",
+                type = "integer",
+                minimum = 200,
+                maximum = 599,
+            },
+            uniqueItems = true,
+            default = {200, 301, 404},
+        },
+        cache_method = {
+            type = "array",
+            minItems = 1,
+            items = {
+                description = "http method",
+                type = "string",
+                enum = {"GET", "POST", "PUT", "DELETE", "PATCH", "HEAD",
+                    "OPTIONS", "CONNECT", "TRACE"},
+                default = {"GET", "HEAD"},
+            },
+            uniqueItems = true,
+            default = {"GET", "HEAD"},
+        },
+        hide_cache_headers = {
+            type = "boolean",
+            default = false,
+        },
+        cache_strategy = {
+            type = "string",
+            default = "disk",
+            enum = {"disk", "memory"},
+            minLength = 0
+        },
+        cache_bypass = {
+            type = "string",
+            default = "1",
+            minLength = 0
+        },
+        no_cache = {
+            type = "string",
+            default = "0",
+            minLength = 0
+        },
+    },
+    required = {"cache_zone", "cache_key"},
+}
+
+local _M = {
+    version = 0.1,
+    priority = 1009,
+    name = plugin_name,
+    schema = schema,
+}
+
+function _M.check_schema(conf)
+    local ok, err = core.schema.check(schema, conf)
+    if not ok then
+        return false, err
+    end
+
+    if conf.cache_strategy == "memory" then
+        return false, "memory cache is not yet supported."
+    end
+
+    return true
+end
+
+-- Copy from redirect plugin, this function is useful.
+-- It can be extracted as a public function.
+local function parse_complex_value(complex_value)
+
+    local reg = [[ (\\\$[0-9a-zA-Z_]+) | ]]     -- \$host
+            .. [[ \$\{([0-9a-zA-Z_]+)\} | ]]    -- ${host}
+            .. [[ \$([0-9a-zA-Z_]+) | ]]        -- $host
+            .. [[ (\$|[^$\\]+) ]]               -- $ or others
+    local iterator, err = re_gmatch(complex_value, reg, "jiox")
+    if not iterator then
+        return nil, err
+    end
+
+    local t = {}
+    while true do
+        local m, err = iterator()
+        if err then
+            return nil, err
+        end
+
+        if not m then
+            break
+        end
+
+        tab_insert(t, m)
+    end
+
+    return t
+end
+
+
+local tmp = {}
+local function generate_complex_value(data, ctx)
 
 Review comment:
   It can parse strings like `${uri}/helloworld` 

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