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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,244 @@ | ||
| package logger | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "path" | ||
| "reflect" | ||
| "runtime" | ||
| "time" | ||
|
|
||
| "go.opentelemetry.io/otel/attribute" | ||
| "go.opentelemetry.io/otel/sdk/resource" | ||
|
|
||
| "github.com/getlantern/golog" | ||
| "github.com/mitchellh/mapstructure" | ||
| "github.com/uptrace/opentelemetry-go-extra/otelutil" | ||
| otlpLog "go.opentelemetry.io/otel/exporters/otlp/otlplog/otlploghttp" | ||
| otelLog "go.opentelemetry.io/otel/log" | ||
| otelLogSdk "go.opentelemetry.io/otel/sdk/log" | ||
| semconv "go.opentelemetry.io/otel/semconv/v1.4.0" | ||
| ) | ||
|
|
||
| const ( | ||
| otelEndpoint = "172.16.0.88:4318" | ||
| otelServiceName = "http-proxy-lantern" | ||
| ) | ||
|
|
||
| // wraps both an otel logger and std logger | ||
| type ProxyLogger struct { | ||
| initializedOtel bool | ||
| stdLogger golog.Logger | ||
| otelLogger otelLog.Logger | ||
| } | ||
|
|
||
| type Opts struct { | ||
| HostMachine string | ||
| TrackName string | ||
| RouteName string | ||
| } | ||
|
|
||
| func (o *Opts) attrKV() []attribute.KeyValue { | ||
| return []attribute.KeyValue{ | ||
| attribute.String("phost", o.HostMachine), | ||
| attribute.String("track", o.TrackName), | ||
| attribute.String("route", o.RouteName), | ||
| } | ||
| } | ||
|
|
||
| // convertFields converts various types of fields into a slice of key-value pairs. | ||
| func convertFields(fields ...any) []any { | ||
| var result []any | ||
| for _, field := range fields { | ||
| switch v := field.(type) { | ||
| case []interface{}: | ||
| for i := 0; i < len(v); i += 2 { | ||
| if i+1 < len(v) { | ||
| result = append(result, v[i], v[i+1]) | ||
| } | ||
| } | ||
| default: | ||
| val := reflect.ValueOf(v) | ||
| if val.Kind() == reflect.Map { | ||
| for _, key := range val.MapKeys() { | ||
| result = append(result, key.Interface(), val.MapIndex(key).Interface()) | ||
| } | ||
| } else if val.Kind() == reflect.Struct { | ||
| var mapResult map[string]interface{} | ||
| err := mapstructure.Decode(v, &mapResult) | ||
| if err == nil { | ||
| result = append(result, v) | ||
| } | ||
|
|
||
| } else { | ||
| result = append(result, v) | ||
| } | ||
| } | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| func kvAttributes(vs []any) []otelLog.KeyValue { | ||
| res := make([]otelLog.KeyValue, 0, len(vs)/2) | ||
|
|
||
| var i int | ||
| for i = 0; i+1 < len(vs); i += 2 { | ||
| k, ok := vs[i].(string) | ||
| if !ok { | ||
| res = append(res, otelLog.String("logError", fmt.Sprintf("%+v is not a string key", vs[i]))) | ||
| } | ||
| res = append(res, otelLog.KeyValue{Key: k, Value: otelutil.LogValue(vs[i+1])}) | ||
| } | ||
|
|
||
| if i < len(vs) { | ||
| res = append(res, otelLog.KeyValue{Key: "_EXTRA", Value: otelutil.LogValue(vs[i])}) | ||
| } | ||
|
|
||
| return res | ||
| } | ||
|
|
||
| func InitLogger(loggerLoc string, opts *Opts) *ProxyLogger { | ||
| goLog := golog.LoggerFor(loggerLoc) | ||
| p := &ProxyLogger{ | ||
| stdLogger: goLog, | ||
| } | ||
|
|
||
| if opts == nil { | ||
| return p | ||
| } | ||
|
|
||
| expLog, err := otlpLog.New(context.Background(), | ||
| otlpLog.WithEndpoint(otelEndpoint), | ||
| otlpLog.WithInsecure(), // the endpoint is on the lo interface, so this "might" be safe | ||
| ) | ||
| if err != nil { | ||
| return p | ||
| } | ||
|
|
||
| resourceAttributes := []attribute.KeyValue{semconv.ServiceNameKey.String(otelServiceName), attribute.String("logger_location", loggerLoc)} | ||
| resourceAttributes = append(resourceAttributes, opts.attrKV()...) | ||
|
|
||
| r := resource.NewWithAttributes(semconv.SchemaURL, resourceAttributes...) | ||
| provider := otelLogSdk.NewLoggerProvider( | ||
| otelLogSdk.WithProcessor(otelLogSdk.NewBatchProcessor(expLog)), | ||
| otelLogSdk.WithResource(r), | ||
| ) | ||
|
|
||
| p.otelLogger = provider.Logger(otelServiceName) | ||
| p.initializedOtel = true | ||
| return p | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) writeLog(severity otelLog.Severity, message string, fields ...any) { | ||
| if pl.otelLogger == nil { | ||
| return | ||
| } | ||
| var record otelLog.Record | ||
| record.SetTimestamp(time.Now()) | ||
| record.SetBody(otelLog.StringValue(message)) | ||
| record.SetSeverity(severity) | ||
| record.SetSeverityText(severity.String()) | ||
|
|
||
| fields = convertFields(fields...) | ||
| record.AddAttributes(kvAttributes(fields)...) | ||
|
|
||
| if pc, file, line, ok := runtime.Caller(2); ok { | ||
| fn := "" | ||
| if function := runtime.FuncForPC(pc); function != nil { | ||
| fn = function.Name() | ||
| } | ||
| record.AddAttributes(otelLog.String("file", path.Base(file)), otelLog.Int64("line", int64(line)), otelLog.String("function", fn)) | ||
| } | ||
|
|
||
| pl.otelLogger.Emit(context.Background(), record) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Debug(message string) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Debug(message) | ||
| } | ||
| pl.writeLog(otelLog.SeverityDebug, message) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Debugf(format string, args ...any) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Debugf(format, args...) | ||
| } | ||
| pl.writeLog(otelLog.SeverityDebug, format, args...) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Fatal(message any) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Fatal(message) | ||
| } | ||
|
|
||
| var msg string | ||
|
|
||
| switch v := message.(type) { | ||
| case error: | ||
| msg = v.Error() | ||
| case fmt.Stringer: | ||
| msg = v.String() | ||
| case string: | ||
| msg = v | ||
| default: | ||
| msg = "unknown error" | ||
| return | ||
| } | ||
|
|
||
| pl.writeLog(otelLog.SeverityFatal, msg) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Fatalf(format string, args ...any) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Fatalf(format, args...) | ||
| } | ||
| pl.writeLog(otelLog.SeverityFatal, format, args...) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Trace(message string) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Trace(message) | ||
| } | ||
| pl.writeLog(otelLog.SeverityTrace, message) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Tracef(format string, args ...any) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Tracef(format, args...) | ||
| } | ||
| pl.writeLog(otelLog.SeverityTrace, format, args...) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Error(message any) { | ||
| var msg string | ||
|
|
||
| switch v := message.(type) { | ||
| case error: | ||
| msg = v.Error() | ||
| case fmt.Stringer: | ||
| msg = v.String() | ||
| case string: | ||
| msg = v | ||
| default: | ||
| msg = "unknown error" | ||
| return | ||
| } | ||
|
|
||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Error(msg) | ||
| } | ||
|
|
||
| pl.writeLog(otelLog.SeverityError, msg) | ||
| } | ||
|
|
||
| func (pl *ProxyLogger) Errorf(format string, args ...any) { | ||
| if pl.stdLogger != nil { | ||
| pl.stdLogger.Errorf(format, args...) | ||
| } | ||
|
|
||
| err := fmt.Errorf(format, args...) | ||
| msg := err.Error() | ||
|
|
||
| pl.writeLog(otelLog.SeverityError, msg) | ||
| } |
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