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+---
+date: "2019-04-02T17:06:00+01:00"
+title: "Advanced: Logging Configuration"
+slug: "logging-configuration"
+weight: 55
+toc: true
+draft: false
+menu:
+  sidebar:
+    parent: "advanced"
+    name: "Logging Configuration"
+    weight: 55
+    identifier: "logging-configuration"
+---
+
+# Logging Configuration
+
+The logging framework has been revamped in Gitea 1.9.0.
+
+## Log Groups
+
+The fundamental thing to be aware of in Gitea is that there are several
+log groups:
+
+* The "Default" logger
+* The Macaron logger
+* The Router logger
+* The Access logger
+* The XORM logger
+* A logger called the `GitLogger` which is used during hooks.
+
+There is also the go log logger.
+
+### The go log logger
+
+Go provides its own extremely basic logger in the `log` package,
+however, this is not sufficient for our purposes as it does not provide
+a way of logging at multiple levels, nor does it provide a good way of
+controlling where these logs are logged except through setting of a
+writer.
+
+We have therefore redirected this logger to our Default logger, and we
+will log anything that is logged using the go logger at the INFO level.
+
+### The "Default" logger
+
+Calls to `log.Info`, `log.Debug`, `log.Error` etc. from the `code.gitea.io/gitea/modules/log` package will log to this logger.
+
+You can configure the outputs of this logger by setting the `MODE`
+value in the `[log]` section of the configuration.
+
+Each output sublogger is configured in a separate `[log.sublogger]`
+section, but there are certain default values. These will not be inherited from the `[log]` section:
+
+* `FLAGS` is `stdflags` (Equal to
+`date,time,medfile,shortfuncname,levelinitial`)
+* `FILE_NAME` will default to `%(ROOT_PATH)/gitea.log`
+* `EXPRESSION` will default to `""`
+* `PREFIX` will default to `""`
+
+The provider type of the sublogger can be set using the `MODE` value in
+its subsection, but will default to the name. This allows you to have
+multiple subloggers that will log to files.
+
+### The "Macaron" logger
+
+By default Macaron will log to its own go `log` instance. This writes
+to `os.Stdout`. You can redirect this log to a Gitea configurable logger
+through setting the `ENABLE_MACARON_REDIRECT` setting in the `[log]`
+section which you can configure the outputs of by setting the `MACARON`
+value in the `[log]` section of the configuration. `MACARON` defaults
+to `file` if unset.
+
+Each output sublogger for this logger is configured in
+`[log.sublogger.macaron]` sections. There are certain default values
+which will not be inherited from the `[log]` or relevant
+`[log.sublogger]` sections:
+
+* `FLAGS` is `stdflags` (Equal to
+`date,time,medfile,shortfuncname,levelinitial`)
+* `FILE_NAME` will default to `%(ROOT_PATH)/macaron.log`
+* `EXPRESSION` will default to `""`
+* `PREFIX` will default to `""`
+
+NB: You can redirect the macaron logger to send its events to the gitea
+log using the value: `MACARON = ,`
+
+### The "Router" logger
+
+There are two types of Router log. By default Macaron send its own
+router log which will be directed to Macaron's go `log`, however if you
+`ENABLE_MACARON_REDIRECT` you will enable Gitea's router log. You can
+disable both types of Router log by setting `DISABLE_ROUTER_LOG`.
+
+If you enable the redirect, you can configure the outputs of this
+router log by setting the `ROUTER` value in the `[log]` section of the
+configuration. `ROUTER` will default to `console` if unset. The Gitea
+Router logs the same data as the Macaron log but has slightly different
+coloring. It logs at the `Info` level by default, but this can be
+changed if desired by setting the `ROUTER_LOG_LEVEL` value.
+
+Each output sublogger for this logger is configured in
+`[log.sublogger.router]` sections. There are certain default values
+which will not be inherited from the `[log]` or relevant
+`[log.sublogger]` sections:
+
+* `FILE_NAME` will default to `%(ROOT_PATH)/router.log`
+* `FLAGS` defaults to `date,time`
+* `EXPRESSION` will default to `""`
+* `PREFIX` will default to `""`
+
+NB: You can redirect the router logger to send its events to the Gitea
+log using the value: `ROUTER = ,`
+
+### The "Access" logger
+
+The Access logger is a new logger for version 1.9. It provides a NCSA
+Common Log compliant log format. It's highly configurable but caution
+should be taken when changing its template. The main benefit of this
+logger is that Gitea can now log accesses in a standard log format so
+standard tools may be used.
+
+You can enable this logger using `ENABLE_ACCESS_LOG`. Its outputs are
+configured by setting the `ACCESS` value in the `[log]` section of the
+configuration. `ACCESS` defaults to `file` if unset.
+
+Each output sublogger for this logger is configured in
+`[log.sublogger.access]` sections. There are certain default values
+which will not be inherited from the `[log]` or relevant
+`[log.sublogger]` sections:
+
+* `FILE_NAME` will default to `%(ROOT_PATH)/access.log`
+* `FLAGS` defaults to `` or None
+* `EXPRESSION` will default to `""`
+* `PREFIX` will default to `""`
+
+If desired the format of the Access logger can be changed by changing
+the value of the `ACCESS_LOG_TEMPLATE`.
+
+NB: You can redirect the access logger to send its events to the Gitea
+log using the value: `ACCESS = ,`
+
+#### The ACCESS_LOG_TEMPLATE
+
+This value represent a go template. It's default value is:
+
+`{{.Ctx.RemoteAddr}} - {{.Identity}} {{.Start.Format "[02/Jan/2006:15:04:05 -0700]" }} "{{.Ctx.Req.Method}} {{.Ctx.Req.RequestURI}} {{.Ctx.Req.Proto}}" {{.ResponseWriter.Status}} {{.ResponseWriter.Size}} "{{.Ctx.Req.Referer}}\" \"{{.Ctx.Req.UserAgent}}"`
+
+The template is passed following options:
+
+* `Ctx` is the `macaron.Context`
+* `Identity` is the `SignedUserName` or `"-"` if the user is not logged
+in
+* `Start` is the start time of the request
+* `ResponseWriter` is the `macaron.ResponseWriter`
+
+Caution must be taken when changing this template as it runs outside of
+the standard panic recovery trap. The template should also be as simple
+as it runs for every request.
+
+### The "XORM" logger
+
+The XORM logger is a long-standing logger that exists to collect XORM
+log events. It is enabled by default but can be switched off by setting
+`ENABLE_XORM_LOG` to `false` in the `[log]` section. Its outputs are
+configured by setting the `XORM` value in the `[log]` section of the
+configuration. `XORM` defaults to `,` if unset, meaning it is redirected
+to the main Gitea log.
+
+XORM will log SQL events by default. This can be changed by setting
+the `LOG_SQL` value to `false` in the `[database]` section.
+
+Each output sublogger for this logger is configured in
+`[log.sublogger.xorm]` sections. There are certain default values
+which will not be inherited from the `[log]` or relevant
+`[log.sublogger]` sections:
+
+* `FILE_NAME` will default to `%(ROOT_PATH)/xorm.log`
+* `FLAGS` defaults to `date,time`
+* `EXPRESSION` will default to `""`
+* `PREFIX` will default to `""`
+
+### The Hook and Serv "GitLoggers"
+
+These are less well defined loggers. Essentially these should only be
+used within Gitea's subsystems and cannot be configured at present.
+
+They will write log files in:
+
+* `%(ROOT_PATH)/hooks/pre-receive.log`
+* `%(ROOT_PATH)/hooks/update.log`
+* `%(ROOT_PATH)/hooks/post-receive.log`
+* `%(ROOT_PATH)/serv.log`
+* `%(ROOT_PATH)/http.log`
+
+In the future these logs may be rationalised.
+
+## Log outputs
+
+Gitea provides 4 possible log outputs:
+
+* `console` - Log to `os.Stdout` or `os.Stderr`
+* `file` - Log to a file
+* `conn` - Log to a keep-alive TCP connection
+* `smtp` - Log via email
+
+Certain configuration is common to all modes of log output:
+
+* `LEVEL` is the lowest level that this output will log. This value
+is inherited from `[log]` and in the case of the non-default loggers
+from `[log.sublogger]`.
+* `STACKTRACE_LEVEL` is the lowest level that this output will print
+a stacktrace. This value is inherited.
+* `MODE` is the mode of the log output. It will default to the sublogger
+name. Thus `[log.console.macaron]` will default to `MODE = console`.
+* `COLORIZE` will default to `true` for `file` and `console` as
+described, otherwise it will default to `false`.
+
+### Non-inherited default values
+
+There are several values which are not inherited as described above but
+rather default to those specific to type of logger, these are:
+`EXPRESSION`, `FLAGS`, `PREFIX` and `FILE_NAME`.
+
+#### `EXPRESSION`
+
+`EXPRESSION` represents a regular expression that log events must match to be logged by the sublogger. Either the log message, (with colors removed), must match or the `longfilename:linenumber:functionname` must match. NB: the whole message or string doesn't need to completely match.
+
+Please note this expression will be run in the sublogger's goroutine
+not the logging event subroutine. Therefore it can be complicated.
+
+#### `FLAGS`
+
+`FLAGS` represents the preceding logging context information that is
+printed before each message. It is a comma-separated string set. The order of values does not matter.
+
+Possible values are:
+
+* `none` or `,` - No flags.
+* `date` - the date in the local time zone: `2009/01/23`.
+* `time` - the time in the local time zone: `01:23:23`.
+* `microseconds` - microsecond resolution: `01:23:23.123123`. Assumes
+time.
+* `longfile` - full file name and line number: `/a/b/c/d.go:23`.
+* `shortfile` - final file name element and line number: `d.go:23`.
+* `funcname` - function name of the caller: `runtime.Caller()`.
+* `shortfuncname` - last part of the function name. Overrides
+`funcname`.
+* `utc` - if date or time is set, use UTC rather than the local time
+zone.
+* `levelinitial` - Initial character of the provided level in brackets eg. `[I]` for info.
+* `level` - Provided level in brackets `[INFO]`
+* `medfile` - Last 20 characters of the filename - equivalent to
+`shortfile,longfile`.
+* `stdflags` - Equivalent to `date,time,medfile,shortfuncname,levelinitial`
+
+### Console mode
+
+For loggers in console mode, `COLORIZE` will default to `true` if not
+on windows, or the windows terminal can be set into ANSI mode or is a
+cygwin or Msys pipe.
+
+If `STDERR` is set to `true` the logger will use `os.Stderr` instead of
+`os.Stdout`.
+
+### File mode
+
+The `FILE_NAME` defaults as described above. If set it will be relative
+to the provided `ROOT_PATH` in the master `[log]` section.
+
+Other values:
+
+* `LOG_ROTATE`: **true**: Rotate the log files.
+* `MAX_SIZE_SHIFT`: **28**: Maximum size shift of a single file, 28 represents 256Mb.
+* `DAILY_ROTATE`: **true**: Rotate logs daily.
+* `MAX_DAYS`: **7**: Delete the log file after n days
+* NB: `COLORIZE`: will default to `true` if not on windows.
+* `COMPRESS`: **true**: Compress old log files by default with gzip
+* `COMPRESSION_LEVEL`: **-1**: Compression level
+
+### Conn mode
+
+* `RECONNECT_ON_MSG`: **false**: Reconnect host for every single message.
+* `RECONNECT`: **false**: Try to reconnect when connection is lost.
+* `PROTOCOL`: **tcp**: Set the protocol, either "tcp", "unix" or "udp".
+* `ADDR`: **:7020**: Sets the address to connect to.
+
+### SMTP mode
+
+It is not recommended to use this logger to send general logging
+messages. However, you could perhaps set this logger to work on `FATAL`.
+
+* `USER`: User email address to send from.
+* `PASSWD`: Password for the smtp server.
+* `HOST`: **127.0.0.1:25**: The SMTP host to connect to.
+* `RECEIVERS`: Email addresses to send to.
+* `SUBJECT`: **Diagnostic message from Gitea**
+
+## Default Configuration
+
+The default empty configuration is equivalent to:
+
+```ini
+[log]
+ROOT_PATH = %(GITEA_WORK_DIR)/log
+MODE = console
+LEVEL = Info
+STACKTRACE_LEVEL = None
+REDIRECT_MACARON_LOG = false
+ENABLE_ACCESS_LOG = false
+ENABLE_XORM_LOG = true
+XORM = ,
+
+[log.console]
+MODE = console
+LEVEL = %(LEVEL)
+STACKTRACE_LEVEL = %(STACKTRACE_LEVEL)
+FLAGS = stdflags
+PREFIX =
+COLORIZE = true # Or false if your windows terminal cannot color
+```
+
+This is equivalent to sending all logs to the console, with default go log being sent to the console log too.
+
+## Log colorization
+
+Logs to the console will be colorized by default when not running on
+Windows. Terminal sniffing will occur on Windows and if it is
+determined that we are running on a terminal capable of color we will
+colorize.
+
+Further, on *nix it is becoming common to have file logs that are
+colored by default. Therefore file logs will be colorised by default
+when not running on Windows.
+
+You can switch on or off colorization by using the `COLORIZE` value.
+
+From a development point of view. If you write
+`log.Info("A %s string", "formatted")` the `formatted` part of the log
+message will be Bolded on colorized logs.
+
+You can change this by either rendering the formatted string yourself.
+Or you can wrap the value in a `log.ColoredValue` struct.
+
+The `log.ColoredValue` struct contains a pointer to value, a pointer to
+string of bytes which should represent a color and second set of reset
+bytes. Pointers were chosen to prevent copying of large numbers of
+values. There are several helper methods:
+
+* `log.NewColoredValue` takes a value and 0 or more color attributes
+that represent the color. If 0 are provided it will default to a cached
+bold. Note, it is recommended that color bytes constructed from
+attributes should be cached if this is a commonly used log message.
+* `log.NewColoredValuePointer` takes a pointer to a value, and
+0 or more color attributes that represent the color.
+* `log.NewColoredValueBytes` takes a value and a pointer to an array
+of bytes representing the color.
+
+These functions will not double wrap a `log.ColoredValue`. They will
+also set the ResetBytes to the cached resetBytes.
+
+Be careful not to change the contents of resetBytes or boldBytes as this
+will break rendering of logging elsewhere. You have been warned.
+
+## Log Spoofing protection
+
+In order to protect the logs from being spoofed with cleverly
+constructed messages. Newlines are now prefixed with a tab and control
+characters except those used in an ANSI CSI are escaped with a
+preceding `\` and their octal value.
+
+## Creating a new named logger group
+
+Should a developer wish to create a new named logger, `NEWONE`. It is
+recommended to add an `ENABLE_NEWONE_LOG` value to the `[log]`
+section, and to add a new `NEWONE` value for the modes.
+
+A function like `func newNewOneLogService()` is recommended to manage
+construction of the named logger. e.g.
+
+```go
+func newNewoneLogService() {
+	EnableNewoneLog = Cfg.Section("log").Key("ENABLE_NEWONE_LOG").MustBool(false)
+	Cfg.Section("log").Key("NEWONE").MustString("file") // or console? or "," if you want to send this to default logger by default
+	if EnableNewoneLog {
+		options := newDefaultLogOptions()
+		options.filename = filepath.Join(LogRootPath, "newone.log")
+		options.flags = "stdflags"
+		options.bufferLength = Cfg.Section("log").Key("BUFFER_LEN").MustInt64(10000)
+		generateNamedLogger("newone", options)
+	}
+}
+```
+
+You should then add `newOneLogService` to `NewServices()` in 
+`modules/setting/setting.go`