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package context
import (
"fmt"
"github.com/sirupsen/logrus"
"runtime"
)
// Logger provides a leveled-logging interface.
type Logger interface {
// standard logger methods
Print(args ...interface{})
Printf(format string, args ...interface{})
Println(args ...interface{})
Fatal(args ...interface{})
Fatalf(format string, args ...interface{})
Fatalln(args ...interface{})
Panic(args ...interface{})
Panicf(format string, args ...interface{})
Panicln(args ...interface{})
// Leveled methods, from logrus
Debug(args ...interface{})
Debugf(format string, args ...interface{})
Debugln(args ...interface{})
Error(args ...interface{})
Errorf(format string, args ...interface{})
Errorln(args ...interface{})
Info(args ...interface{})
Infof(format string, args ...interface{})
Infoln(args ...interface{})
Warn(args ...interface{})
Warnf(format string, args ...interface{})
Warnln(args ...interface{})
}
// WithLogger creates a new context with provided logger.
func WithLogger(ctx Context, logger Logger) Context {
return WithValue(ctx, "logger", logger)
}
// GetLoggerWithField returns a logger instance with the specified field key
// and value without affecting the context. Extra specified keys will be
// resolved from the context.
func GetLoggerWithField(ctx Context, key, value interface{}, keys ...interface{}) Logger {
return getLogrusLogger(ctx, keys...).WithField(fmt.Sprint(key), value)
}
// GetLoggerWithFields returns a logger instance with the specified fields
// without affecting the context. Extra specified keys will be resolved from
// the context.
func GetLoggerWithFields(ctx Context, fields map[interface{}]interface{}, keys ...interface{}) Logger {
// must convert from interface{} -> interface{} to string -> interface{} for logrus.
lfields := make(logrus.Fields, len(fields))
for key, value := range fields {
lfields[fmt.Sprint(key)] = value
}
return getLogrusLogger(ctx, keys...).WithFields(lfields)
}
// GetLogger returns the logger from the current context, if present. If one
// or more keys are provided, they will be resolved on the context and
// included in the logger. While context.Value takes an interface, any key
// argument passed to GetLogger will be passed to fmt.Sprint when expanded as
// a logging key field. If context keys are integer constants, for example,
// its recommended that a String method is implemented.
func GetLogger(ctx Context, keys ...interface{}) Logger {
return getLogrusLogger(ctx, keys...)
}
// GetLogrusLogger returns the logrus logger for the context. If one more keys
// are provided, they will be resolved on the context and included in the
// logger. Only use this function if specific logrus functionality is
// required.
func getLogrusLogger(ctx Context, keys ...interface{}) *logrus.Entry {
var logger *logrus.Entry
// Get a logger, if it is present.
loggerInterface := ctx.Value("logger")
if loggerInterface != nil {
if lgr, ok := loggerInterface.(*logrus.Entry); ok {
logger = lgr
}
}
if logger == nil {
fields := logrus.Fields{}
// Fill in the instance id, if we have it.
instanceID := ctx.Value("instance.id")
if instanceID != nil {
fields["instance.id"] = instanceID
}
fields["go.version"] = runtime.Version()
// If no logger is found, just return the standard logger.
logger = logrus.StandardLogger().WithFields(fields)
}
fields := logrus.Fields{}
for _, key := range keys {
v := ctx.Value(key)
if v != nil {
fields[fmt.Sprint(key)] = v
}
}
return logger.WithFields(fields)
}
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