1[← Debug](6-Debug-EN.md) | Logger[(中文)](7-Logger-CN.md) | [Concurrent →](8-Concurrent-EN.md) 2*** 3 4 5# Logger 6 7## Description 8 9The logger is mainly used to provide support for auditing, to record each call, similar to the server's access log. 10 11## Using 12 13### Init logger 14 15If you want to use the log function, you need to initialize a log object first. You can set the log level, log template, log output path and channel when initializing the log object. 16```go 17// level: default value is info 18// channel: default value is AlibabaCloud 19// file: should be an object that implements the io.writer interface 20// templete: logger template, If not entered, the default value is `{time} {channel}: "{method} {uri} HTTP/{version}" {code} {cost} {hostname}` 21client.SetLogger("level", "channel", file, templete) // Set the client's log. When you call this method, the log function is enabled by default. 22``` 23 24### Related operations 25 26```go 27logger := client.GetLogger() // Get client logger 28client.OpenLogger() // Open logger, if clien logger is not exist, there will create a default logger for client 29client.CloseLogger() // Close logger 30client.GetLoggerMsg() // Get last logger message,if clien logger is not exist, there will create a default logger for client 31client.SetTemplate(templete) // Set client logger template,if clien logger is not exist, there will create a default logger for client 32client.GetTemplate() // Get client logger template,if clien logger is not exist, there will create a default logger for client 33``` 34 35### Variables 36 37| Variables | Description | 38|----------|-------------| 39| {channel} | name of the log | 40| {host} | Host of the request | 41| {ts} | GMT中的 ISO 8601日期 | 42| {method} | Method of the request | 43| {uri} | URI of the request | 44| {version} | Protocol version | 45| {target} | Request target of the request (path + query) | 46| {hostname} | Hostname of the machine that sent the request | 47| {code} | Status code of the response (if available) | 48| {error} | Any error messages (if available) | 49| {req_headers} | Request headers | 50| {res_headers} | Response headers | 51| {pid} | PID | 52| {cost} | Cost Time | 53| {start_time} | start Time | 54 55*** 56[← Debug](6-Debug-EN.md) | Logger[(中文)](7-Logger-CN.md) | [Concurrent →](8-Concurrent-EN.md)