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package logger
import (
"fmt"
"io"
"log"
"os"
"strconv"
)
var (
DefaultLogger = newLogger(os.Stderr, LogLevelWarning)
logger Logger = DefaultLogger
)
// loggerT is the default logger used by scaleway-sdk-go.
type loggerT struct {
m [4]*log.Logger
v LogLevel
}
// Init create a new default logger.
// Not mutex-protected, should be called before any scaleway-sdk-go functions.
func (g *loggerT) Init(w io.Writer, level LogLevel) {
g.m = newLogger(w, level).m
g.v = level
}
// Debugf logs to the DEBUG log. Arguments are handled in the manner of fmt.Printf.
func Debugf(format string, args ...interface{}) { logger.Debugf(format, args...) }
func (g *loggerT) Debugf(format string, args ...interface{}) {
g.m[LogLevelDebug].Printf(format, args...)
}
// Infof logs to the INFO log. Arguments are handled in the manner of fmt.Printf.
func Infof(format string, args ...interface{}) { logger.Infof(format, args...) }
func (g *loggerT) Infof(format string, args ...interface{}) {
g.m[LogLevelInfo].Printf(format, args...)
}
// Warningf logs to the WARNING log. Arguments are handled in the manner of fmt.Printf.
func Warningf(format string, args ...interface{}) { logger.Warningf(format, args...) }
func (g *loggerT) Warningf(format string, args ...interface{}) {
g.m[LogLevelWarning].Printf(format, args...)
}
// Errorf logs to the ERROR log. Arguments are handled in the manner of fmt.Printf.
func Errorf(format string, args ...interface{}) { logger.Errorf(format, args...) }
func (g *loggerT) Errorf(format string, args ...interface{}) {
g.m[LogLevelError].Printf(format, args...)
}
// ShouldLog reports whether verbosity level l is at least the requested verbose level.
func ShouldLog(level LogLevel) bool { return logger.ShouldLog(level) }
func (g *loggerT) ShouldLog(level LogLevel) bool {
return level >= g.v
}
func isEnabled(envKey string) bool {
env, exist := os.LookupEnv(envKey)
if !exist {
return false
}
value, err := strconv.ParseBool(env)
if err != nil {
fmt.Fprintf(os.Stderr, "ERROR: environment variable %s has invalid boolean value\n", envKey)
}
return value
}
// newLogger creates a logger to be used as default logger.
// All logs are written to w.
func newLogger(w io.Writer, level LogLevel) *loggerT {
errorW := io.Discard
warningW := io.Discard
infoW := io.Discard
debugW := io.Discard
if isEnabled(DebugEnv) {
level = LogLevelDebug
}
switch level {
case LogLevelDebug:
debugW = w
case LogLevelInfo:
infoW = w
case LogLevelWarning:
warningW = w
case LogLevelError:
errorW = w
}
// Error logs will be written to errorW, warningW, infoW and debugW.
// Warning logs will be written to warningW, infoW and debugW.
// Info logs will be written to infoW and debugW.
// Debug logs will be written to debugW.
var m [4]*log.Logger
m[LogLevelError] = log.New(io.MultiWriter(debugW, infoW, warningW, errorW),
severityName[LogLevelError]+": ", log.LstdFlags)
m[LogLevelWarning] = log.New(io.MultiWriter(debugW, infoW, warningW),
severityName[LogLevelWarning]+": ", log.LstdFlags)
m[LogLevelInfo] = log.New(io.MultiWriter(debugW, infoW),
severityName[LogLevelInfo]+": ", log.LstdFlags)
m[LogLevelDebug] = log.New(debugW,
severityName[LogLevelDebug]+": ", log.LstdFlags)
return &loggerT{m: m, v: level}
}
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