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package log
/*
http://en.wikipedia.org/wiki/Syslog
Code Severity Keyword
0 Emergency emerg (panic) System is unusable.
A "panic" condition usually affecting multiple apps/servers/sites. At this
level it would usually notify all tech staff on call.
1 Alert alert Action must be taken immediately.
Should be corrected immediately, therefore notify staff who can fix the
problem. An example would be the loss of a primary ISP connection.
2 Critical crit Critical conditions.
Should be corrected immediately, but indicates failure in a secondary
system, an example is a loss of a backup ISP connection.
3 Error err (error) Error conditions.
Non-urgent failures, these should be relayed to developers or admins; each
item must be resolved within a given time.
4 Warning warning (warn) Warning conditions.
Warning messages, not an error, but indication that an error will occur if
action is not taken, e.g. file system 85% full - each item must be resolved
within a given time.
5 Notice notice Normal but significant condition.
Events that are unusual but not error conditions - might be summarized in
an email to developers or admins to spot potential problems - no immediate
action required.
6 Informational info Informational messages.
Normal operational messages - may be harvested for reporting, measuring
throughput, etc. - no action required.
7 Debug debug Debug-level messages.
Info useful to developers for debugging the application, not useful during operations.
*/
const (
// LevelEnv chooses level from LOGXI environment variable or defaults
// to LevelInfo
LevelEnv = -10000
// LevelOff means logging is disabled for logger. This should always
// be first
LevelOff = -1000
// LevelEmergency is usually 0 but that is also the "zero" value
// for Go, which means whenever we do any lookup in string -> int
// map 0 is returned (not good).
LevelEmergency = -1
// LevelAlert means action must be taken immediately.
LevelAlert = 1
// LevelFatal means it should be corrected immediately, eg cannot connect to database.
LevelFatal = 2
// LevelCritical is alias for LevelFatal
LevelCritical = 2
// LevelError is a non-urgen failure to notify devlopers or admins
LevelError = 3
// LevelWarn indiates an error will occur if action is not taken, eg file system 85% full
LevelWarn = 4
// LevelNotice is normal but significant condition.
LevelNotice = 5
// LevelInfo is info level
LevelInfo = 6
// LevelDebug is debug level
LevelDebug = 7
// LevelTrace is trace level and displays file and line in terminal
LevelTrace = 10
// LevelAll is all levels
LevelAll = 1000
)
// FormatHappy uses HappyDevFormatter
const FormatHappy = "happy"
// FormatText uses TextFormatter
const FormatText = "text"
// FormatJSON uses JSONFormatter
const FormatJSON = "JSON"
// FormatEnv selects formatter based on LOGXI_FORMAT environment variable
const FormatEnv = ""
// LevelMap maps int enums to string level.
var LevelMap = map[int]string{
LevelFatal: "FTL",
LevelError: "ERR",
LevelWarn: "WRN",
LevelInfo: "INF",
LevelDebug: "DBG",
LevelTrace: "TRC",
}
// LevelMap maps int enums to string level.
var LevelAtoi = map[string]int{
"OFF": LevelOff,
"FTL": LevelFatal,
"ERR": LevelError,
"WRN": LevelWarn,
"INF": LevelInfo,
"DBG": LevelDebug,
"TRC": LevelTrace,
"ALL": LevelAll,
"off": LevelOff,
"fatal": LevelFatal,
"error": LevelError,
"warn": LevelWarn,
"info": LevelInfo,
"debug": LevelDebug,
"trace": LevelTrace,
"all": LevelAll,
}
// Logger is the interface for logging.
type Logger interface {
Trace(msg string, args ...interface{})
Debug(msg string, args ...interface{})
Info(msg string, args ...interface{})
Warn(msg string, args ...interface{}) error
Error(msg string, args ...interface{}) error
Fatal(msg string, args ...interface{})
Log(level int, msg string, args []interface{})
SetLevel(int)
IsTrace() bool
IsDebug() bool
IsInfo() bool
IsWarn() bool
// Error, Fatal not needed, those SHOULD always be logged
}
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