change: patch log functions

apisix/core/response.lua

@@ -70,7 +70,9 @@ function resp_exit(code, ...)
                 error("failed to encode data: " .. err, -2)
             else
                 idx = idx + 1
-                t[idx] = body .. "\n"
+                t[idx] = body
+                idx = idx + 1
+                t[idx] = "\n"
             end
 
         elseif v ~= nil then
@@ -80,7 +82,7 @@ function resp_exit(code, ...)
     end
 
     if idx > 0 then
-        ngx_print(concat_tab(t, "", 1, idx))
+        ngx_print(t)
     end
 
     if code then
@@ -174,7 +176,7 @@ end
 --  final_body = transform(final_body)
 --  ngx.arg[1] = final_body
 --  ...
-function _M.hold_body_chunk(ctx, hold_the_copy)
+function _M.hold_body_chunk(ctx, hold_the_copy, max_resp_body_bytes)
     local body_buffer
     local chunk, eof = arg[1], arg[2]
 
@@ -190,22 +192,32 @@ function _M.hold_body_chunk(ctx, hold_the_copy)
                 n = 1
             }
             ctx._body_buffer[ctx._plugin_name] = body_buffer
+            ctx._resp_body_bytes = #chunk
         else
             local n = body_buffer.n + 1
             body_buffer.n = n
             body_buffer[n] = chunk
+            ctx._resp_body_bytes = ctx._resp_body_bytes + #chunk
+        end
+        if max_resp_body_bytes and ctx._resp_body_bytes >= max_resp_body_bytes then
+            local body_data = concat_tab(body_buffer, "", 1, body_buffer.n)
+            body_data = str_sub(body_data, 1, max_resp_body_bytes)
+            return body_data
         end
     end
 
     if eof then
         body_buffer = ctx._body_buffer[ctx._plugin_name]
         if not body_buffer then
+            if max_resp_body_bytes and #chunk >= max_resp_body_bytes then
+                chunk = str_sub(chunk, 1, max_resp_body_bytes)
+            end
             return chunk
         end
 
-        body_buffer = concat_tab(body_buffer, "", 1, body_buffer.n)
+        local body_data = concat_tab(body_buffer, "", 1, body_buffer.n)
         ctx._body_buffer[ctx._plugin_name] = nil
-        return body_buffer
+        return body_data
     end
 
     if not hold_the_copy then

apisix/plugins/kafka-logger.lua

@@ -14,6 +14,7 @@
 -- See the License for the specific language governing permissions and
 -- limitations under the License.
 --
+local expr     = require("resty.expr.v1")
 local core     = require("apisix.core")
 local log_util = require("apisix.utils.log-util")
 local producer = require ("resty.kafka.producer")
@@ -22,6 +23,7 @@ local bp_manager_mod = require("apisix.utils.batch-processor-manager")
 local math     = math
 local pairs    = pairs
 local type     = type
+local req_read_body = ngx.req.read_body
 local plugin_name = "kafka-logger"
 local batch_processor_manager = bp_manager_mod.new("kafka logger")
 
@@ -95,7 +97,7 @@ local schema = {
         required_acks = {
             type = "integer",
             default = 1,
-            enum = { 0, 1, -1 },
+            enum = { 1, -1 },
         },
         key = {type = "string"},
         timeout = {type = "integer", minimum = 1, default = 3},
@@ -115,6 +117,8 @@ local schema = {
                 type = "array"
             }
         },
+        max_req_body_bytes = {type = "integer", minimum = 1, default = 524288},
+        max_resp_body_bytes = {type = "integer", minimum = 1, default = 524288},
         -- in lua-resty-kafka, cluster_name is defined as number
         -- see https://github.com/doujiang24/lua-resty-kafka#new-1
         cluster_name = {type = "integer", minimum = 1, default = 1},
@@ -134,7 +138,9 @@ local schema = {
 local metadata_schema = {
     type = "object",
     properties = {
-        log_format = log_util.metadata_schema_log_format,
+        log_format = {
+            type = "object"
+        }
     },
 }
 
@@ -208,6 +214,32 @@ local function send_kafka_data(conf, log_message, prod)
 end
 
 
+function _M.access(conf, ctx)
+    if conf.include_req_body then
+        local should_read_body = true
+        if conf.include_req_body_expr then
+            if not conf.request_expr then
+                local request_expr, err = expr.new(conf.include_req_body_expr)
+                if not request_expr then
+                    core.log.error('generate request expr err ', err)
+                    return
+                end
+                conf.request_expr = request_expr
+            end
+
+            local result = conf.request_expr:eval(ctx.var)
+
+            if not result then
+                should_read_body = false
+            end
+        end
+        if should_read_body then
+            req_read_body()
+        end
+    end
+end
+
+
 function _M.body_filter(conf, ctx)
     log_util.collect_body(conf, ctx)
 end

apisix/utils/log-util.lua

@@ -17,29 +17,56 @@
 local core = require("apisix.core")
 local plugin = require("apisix.plugin")
 local expr = require("resty.expr.v1")
-local ngx  = ngx
+local content_decode = require("apisix.utils.content-decode")
+local ngx = ngx
 local pairs = pairs
 local ngx_now = ngx.now
+local ngx_header = ngx.header
 local os_date = os.date
 local str_byte = string.byte
+local str_sub  = string.sub
 local math_floor = math.floor
 local ngx_update_time = ngx.update_time
 local req_get_body_data = ngx.req.get_body_data
 local is_http = ngx.config.subsystem == "http"
+local req_get_body_file = ngx.req.get_body_file
+local MAX_REQ_BODY      = 524288      -- 512 KiB
+local MAX_RESP_BODY     = 524288      -- 512 KiB
+local io                = io
 
 local lru_log_format = core.lrucache.new({
     ttl = 300, count = 512
 })
 
 local _M = {}
-_M.metadata_schema_log_format = {
-    type = "object",
-    default = {
-        ["host"] = "$host",
-        ["@timestamp"] = "$time_iso8601",
-        ["client_ip"] = "$remote_addr",
-    },
-}
+
+
+local function get_request_body(max_bytes)
+    local req_body = req_get_body_data()
+    if req_body then
+        if max_bytes and #req_body >= max_bytes then
+            req_body = str_sub(req_body, 1, max_bytes)
+        end
+        return req_body
+    end
+
+    local file_name = req_get_body_file()
+    if not file_name then
+        return nil
+    end
+
+    core.log.info("attempt to read body from file: ", file_name)
+
+    local f, err = io.open(file_name, 'r')
+    if not f then
+        return nil, "fail to open file " .. err
+    end
+
+    req_body = f:read(max_bytes)
+    f:close()
+
+    return req_body
+end
 
 
 local function gen_log_format(format)
@@ -55,6 +82,7 @@ local function gen_log_format(format)
     return log_format
 end
 
+
 local function get_custom_format_log(ctx, format)
     local log_format = lru_log_format(format or "", nil, gen_log_format, format)
     local entry = core.table.new(0, core.table.nkeys(log_format))
@@ -186,15 +214,13 @@ local function get_full_log(ngx, conf)
         end
 
         if log_request_body then
-            local body = req_get_body_data()
-            if body then
-                log.request.body = body
-            else
-                local body_file = ngx.req.get_body_file()
-                if body_file then
-                    log.request.body_file = body_file
-                end
+            local max_req_body_bytes = conf.max_req_body_bytes or MAX_REQ_BODY
+            local body, err = get_request_body(max_req_body_bytes)
+            if err then
+                core.log.error("fail to get request body: ", err)
+                return
             end
+            log.request.body = body
         end
     end
 
@@ -210,7 +236,27 @@ function _M.inject_get_full_log(f)
 end
 
 
+local function is_match(match, ctx)
+    local match_result
+    for _, m in pairs(match) do
+        local expr, _ = expr.new(m)
+        match_result = expr:eval(ctx.var)
+        if match_result then
+            break
+        end
+    end
+
+    return match_result
+end
+
+
 function _M.get_log_entry(plugin_name, conf, ctx)
+    -- If the "match" configuration is set and the matching conditions are not met,
+    -- then do not log the message.
+    if conf.match and not is_match(conf.match, ctx) then
+        return
+    end
+
     local metadata = plugin.plugin_metadata(plugin_name)
     core.log.info("metadata: ", core.json.delay_encode(metadata))
 
@@ -237,20 +283,21 @@ end
 
 
 function _M.get_req_original(ctx, conf)
-    local headers = {
+    local data = {
         ctx.var.request, "\r\n"
     }
     for k, v in pairs(ngx.req.get_headers()) do
-        core.table.insert_tail(headers, k, ": ", v, "\r\n")
+        core.table.insert_tail(data, k, ": ", v, "\r\n")
     end
-    -- core.log.error("headers: ", core.table.concat(headers, ""))
-    core.table.insert(headers, "\r\n")
+    core.table.insert(data, "\r\n")
 
     if conf.include_req_body then
-        core.table.insert(headers, ctx.var.request_body)
+        local max_req_body_bytes = conf.max_req_body_bytes or MAX_REQ_BODY
+        local req_body = get_request_body(max_req_body_bytes)
+        core.table.insert(data, req_body)
     end
 
-    return core.table.concat(headers, "")
+    return core.table.concat(data, "")
 end
 
 
@@ -295,11 +342,38 @@ function _M.collect_body(conf, ctx)
         end
 
         if log_response_body then
-            local final_body = core.response.hold_body_chunk(ctx, true)
+            local max_resp_body_bytes = conf.max_resp_body_bytes or MAX_RESP_BODY
+
+            if ctx._resp_body_bytes and ctx._resp_body_bytes >= max_resp_body_bytes then
+                return
+            end
+            local final_body = core.response.hold_body_chunk(ctx, true, max_resp_body_bytes)
             if not final_body then
                 return
             end
-            ctx.resp_body = final_body
+
+            local response_encoding = ngx_header["Content-Encoding"]
+            if not response_encoding then
+                ctx.resp_body = final_body
+                return
+            end
+
+            local decoder = content_decode.dispatch_decoder(response_encoding)
+            if not decoder then
+                core.log.warn("unsupported compression encoding type: ",
+                              response_encoding)
+                ctx.resp_body = final_body
+                return
+            end
+
+            local decoded_body, err = decoder(final_body)
+            if err ~= nil then
+                core.log.warn("try decode compressed data err: ", err)
+                ctx.resp_body = final_body
+                return
+            end
+
+            ctx.resp_body = decoded_body
         end
     end
 end