154 lines
3.4 KiB
Go
154 lines
3.4 KiB
Go
package gelfexporter
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import (
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"context"
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"sync"
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"git.ma-al.com/maal-libraries/observer/pkg/attr"
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"git.ma-al.com/maal-libraries/observer/pkg/level"
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"git.ma-al.com/maal-libraries/observer/pkg/syslog"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/sdk/trace"
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"go.opentelemetry.io/otel/sdk/trace/tracetest"
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"gopkg.in/Graylog2/go-gelf.v2/gelf"
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)
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var _ trace.SpanExporter = &Exporter{}
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// New creates an Exporter with the passed options.
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func New(options ...Option) (*Exporter, error) {
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cfg, err := newConfig(options...)
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if err != nil {
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return nil, err
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}
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writer, err := gelf.NewUDPWriter(cfg.GelfUrl)
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if err != nil {
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return nil, err
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}
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return &Exporter{
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gelfWriter: writer,
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}, nil
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}
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type Exporter struct {
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gelfWriter *gelf.UDPWriter
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appName string
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stoppedMu sync.RWMutex
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stopped bool
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}
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func (e *Exporter) ExportSpans(ctx context.Context, spans []trace.ReadOnlySpan) error {
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if err := ctx.Err(); err != nil {
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return err
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}
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e.stoppedMu.RLock()
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stopped := e.stopped
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e.stoppedMu.RUnlock()
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if stopped {
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return nil
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}
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if len(spans) == 0 {
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return nil
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}
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stubs := tracetest.SpanStubsFromReadOnlySpans(spans)
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for i := range stubs {
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stub := &stubs[i]
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var attributes = make(map[string]interface{})
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for _, attr := range stub.Attributes {
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attributes[string(attr.Key)] = GetByType(attr.Value)
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}
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for _, attr := range stub.Resource.Attributes() {
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attributes[string(attr.Key)] = GetByType(attr.Value)
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}
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for i := range stub.Events {
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event := stub.Events[i]
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var gelf GELFMessage = GELFMessage{
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Host: e.appName,
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ShortMessage: event.Name,
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Timestamp: stub.StartTime,
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// Defaults to ALERT since we consider lack of the level a serious error that should be fixed ASAP.
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// Otherwise some dangerous unexpected behaviour could go unnoticed.
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Level: syslog.ALERT,
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ExtraFields: attributes,
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}
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for _, attrKV := range event.Attributes {
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if attrKV.Key == attr.LogMessageLongKey {
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gelf.LongMessage = attrKV.Value.AsString()
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continue
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}
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if attrKV.Key == attr.LogMessageShortKey {
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gelf.ShortMessage = attrKV.Value.AsString()
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continue
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}
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if attrKV.Key == attr.SeverityLevelKey {
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gelf.Level = level.FromString(attrKV.Value.AsString()).IntoSyslogLevel()
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continue
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}
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attributes[string(attrKV.Key)] = GetByType(attrKV.Value)
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}
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Log(e.gelfWriter, gelf)
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}
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}
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return nil
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}
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func GetByType(val attribute.Value) interface{} {
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switch val.Type() {
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case attribute.INVALID:
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return "invalid value"
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case attribute.BOOL:
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return val.AsBool()
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case attribute.INT64:
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return val.AsInt64()
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case attribute.FLOAT64:
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return val.AsFloat64()
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case attribute.STRING:
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return val.AsString()
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case attribute.BOOLSLICE:
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return val.AsBoolSlice()
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case attribute.INT64SLICE:
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return val.AsInt64Slice()
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case attribute.FLOAT64SLICE:
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return val.AsFloat64Slice()
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case attribute.STRINGSLICE:
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return val.AsStringSlice()
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}
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return "invalid value"
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}
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// Shutdown is called to stop the exporter, it performs no action.
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func (e *Exporter) Shutdown(ctx context.Context) error {
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e.stoppedMu.Lock()
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e.stopped = true
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e.stoppedMu.Unlock()
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return nil
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}
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// // MarshalLog is the marshaling function used by the logging system to represent this Exporter.
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// func (e *Exporter) MarshalLog() interface{} {
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// return struct {
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// Type string
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// WithTimestamps bool
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// }{
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// Type: "stdout",
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// WithTimestamps: e.timestamps,
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// }
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// }
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