feat(http-logger): support for specified the log formats via admin API

apisix/plugin.lua

@@ -25,6 +25,7 @@ local type          = type
 local local_plugins = core.table.new(32, 0)
 local ngx           = ngx
 local tostring      = tostring
+local error         = error
 local local_plugins_hash    = core.table.new(0, 32)
 local stream_local_plugins  = core.table.new(32, 0)
 local stream_local_plugins_hash = core.table.new(0, 32)
@@ -391,6 +392,21 @@ end
 
 function _M.init_worker()
     _M.load()
+
+    local plugin_metadatas, err = core.config.new("/plugin_metadata",
+        {automatic = true}
+    )
+    if not plugin_metadatas then
+        error("failed to create etcd instance for fetching /plugin_metadatas : "
+              .. err)
+    end
+
+    _M.plugin_metadatas = plugin_metadatas
+end
+
+
+function _M.plugin_metadata(name)
+    return _M.plugin_metadatas:get(name)
 end
 
 

apisix/plugins/http-logger.lua

@@ -14,17 +14,26 @@
 -- See the License for the specific language governing permissions and
 -- limitations under the License.
 --
-local core = require("apisix.core")
-local log_util = require("apisix.utils.log-util")
+
 local batch_processor = require("apisix.utils.batch-processor")
-local plugin_name = "http-logger"
-local ngx = ngx
+local log_util        = require("apisix.utils.log-util")
+local core            = require("apisix.core")
+local http            = require("resty.http")
+local url             = require("net.url")
+local plugin          = require("apisix.plugin")
+local ngx      = ngx
 local tostring = tostring
-local http = require "resty.http"
-local url = require "net.url"
-local buffers = {}
+local pairs    = pairs
 local ipairs = ipairs
 
+
+local plugin_name = "http-logger"
+local buffers = {}
+local lru_log_format = core.lrucache.new({
+    ttl = 300, count = 512
+})
+
+
 local schema = {
     type = "object",
     properties = {
@@ -45,11 +54,24 @@ local schema = {
 }
 
 
+local metadata_schema = {
+    type = "object",
+    properties = {
+        log_format = {
+            type = "object",
+            default = {},
+        },
+    },
+    additionalProperties = false,
+}
+
+
 local _M = {
     version = 0.1,
     priority = 410,
     name = plugin_name,
     schema = schema,
+    metadata_schema = metadata_schema,
 }
 
 
@@ -117,8 +139,42 @@ local function send_http_data(conf, log_message)
 end
 
 
-function _M.log(conf)
-    local entry = log_util.get_full_log(ngx, conf)
+local function gen_log_format(metadata)
+    local log_format = {}
+    for k, var_name in pairs(metadata.value.log_format) do
+        if var_name:sub(1, 1) == "$" then
+            log_format[k] = {true, var_name:sub(2)}
+        else
+            log_format[k] = {false, var_name}
+        end
+    end
+    core.log.info("log_format: ", core.json.delay_encode(log_format))
+    return log_format
+end
+
+
+function _M.log(conf, ctx)
+    local metadata = plugin.plugin_metadata(plugin_name)
+    core.log.info("metadata: ", core.json.delay_encode(metadata))
+
+    local entry
+    local log_format = lru_log_format(metadata, nil, gen_log_format, metadata)
+    if log_format then
+        entry = core.table.new(0, core.table.nkeys(log_format))
+        for k, var_attr in pairs(log_format) do
+            if var_attr[1] then
+                entry[k] = ctx.var[var_attr[2]]
+            else
+                entry[k] = var_attr[2]
+            end
+        end
+        local matched_route = ctx.matched_route and ctx.matched_route.value
+
+        entry.service_id = matched_route.service_id
+        entry.route_id = matched_route.id
+    else
+        entry = log_util.get_full_log(ngx, conf)
+    end
 
     if not entry.route_id then
         core.log.error("failed to obtain the route id for http logger")

bin/apisix

@@ -1025,7 +1025,7 @@ local function init_etcd(show_output)
         for _, dir_name in ipairs({"/routes", "/upstreams", "/services",
                                    "/plugins", "/consumers", "/node_status",
                                    "/ssl", "/global_rules", "/stream_routes",
-                                   "/proto"}) do
+                                   "/proto", "/plugin_metadata"}) do
             local key =  (etcd_conf.prefix or "") .. dir_name .. "/"
 
             local base64_encode = require("base64").encode

doc/zh-cn/plugins/http-logger.md

@@ -51,7 +51,7 @@
 
 ## 如何开启
 
-1. 这是有关如何为特定路由启用 http-logger 插件的示例。
+这是有关如何为特定路由启用 http-logger 插件的示例。
 
 ```shell
 curl http://127.0.0.1:9080/apisix/admin/routes/1 -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
@@ -82,6 +82,32 @@ HTTP/1.1 200 OK
 hello, world
 ```
 
+## 插件元数据设置
+
+| 名称             | 类型    | 必选项 | 默认值        | 有效值  | 描述                                             |
+| ---------------- | ------- | ------ | ------------- | ------- | ------------------------------------------------ |
+| log_format       | object  | 可选   |               |         | 以 Hash 对象方式声明日志格式。对 value 部分，仅支持字符串。如果是以`$`开头，则表明是要获取 [Nginx 内置变量](http://nginx.org/en/docs/varindex.html)。特别的，该设置是全局生效的，意味着指定 log_format 后，将对所有绑定 http-logger 的 Route 或 Service 生效。 |
+
+### 设置日志格式示例
+
+```shell
+curl http://127.0.0.1:9080/apisix/admin/plugin_metadata/http-logger -H 'X-API-KEY: edd1c9f034335f136f87ad84b625c8f1' -X PUT -d '
+{
+    "log_format": {
+        "host": "$host",
+        "@timestamp": "$time_iso8601",
+        "client_ip": "$remote_addr"
+    }
+}'
+```
+
+在日志收集处，将得到类似下面的日志：
+
+```shell
+{"host":"localhost","@timestamp":"2020-09-23T19:05:05-04:00","client_ip":"127.0.0.1","route_id":"1"}
+{"host":"localhost","@timestamp":"2020-09-23T19:05:05-04:00","client_ip":"127.0.0.1","route_id":"1"}
+```
+
 ## 禁用插件
 
 在插件配置中删除相应的 json 配置以禁用 http-logger。APISIX 插件是热重载的，因此无需重新启动 APISIX：

t/plugin/http-logger-log-format.t

@@ -0,0 +1,147 @@
+#
+# 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.
+#
+use t::APISIX 'no_plan';
+
+log_level('info');
+repeat_each(1);
+no_long_string();
+no_root_location();
+
+run_tests;
+
+__DATA__
+
+=== TEST 1: add plugin metadata
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/plugin_metadata/http-logger',
+                ngx.HTTP_PUT,
+                [[{
+                    "log_format": {
+                        "host": "$host",
+                        "@timestamp": "$time_iso8601",
+                        "client_ip": "$remote_addr"
+                    }
+                }]],
+                [[{
+                    "node": {
+                        "value": {
+                            "log_format": {
+                                "host": "$host",
+                                "@timestamp": "$time_iso8601",
+                                "client_ip": "$remote_addr"
+                            }
+                        }
+                    },
+                    "action": "set"
+                }]]
+                )
+
+            ngx.status = code
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+--- no_error_log
+[error]
+
+
+
+=== TEST 2: sanity, batch_max_size=1
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/routes/1',
+                 ngx.HTTP_PUT,
+                 [[{
+                        "plugins": {
+                            "http-logger": {
+                                "uri": "http://127.0.0.1:1980/log",
+                                "batch_max_size": 1,
+                                "max_retry_count": 1,
+                                "retry_delay": 2,
+                                "buffer_duration": 2,
+                                "inactive_timeout": 2,
+                                "concat_method": "new_line"
+                            }
+                        },
+                        "upstream": {
+                            "nodes": {
+                                "127.0.0.1:1982": 1
+                            },
+                            "type": "roundrobin"
+                        },
+                        "uri": "/hello"
+                }]]
+                )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+--- no_error_log
+[error]
+
+
+
+=== TEST 3: hit route and report http logger
+--- request
+GET /hello
+--- response_body
+hello world
+--- wait: 0.5
+--- no_error_log
+[error]
+--- error_log
+request log: {"host":"localhost"
+
+
+
+=== TEST 4: remove plugin metadata
+--- config
+    location /t {
+        content_by_lua_block {
+            local t = require("lib.test_admin").test
+            local code, body = t('/apisix/admin/plugin_metadata/http-logger',
+                ngx.HTTP_DELETE
+            )
+
+            if code >= 300 then
+                ngx.status = code
+            end
+
+            ngx.say(body)
+        }
+    }
+--- request
+GET /t
+--- response_body
+passed
+--- no_error_log
+[error]