mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2024-11-30 07:32:45 +00:00
361 lines
9.6 KiB
Go
361 lines
9.6 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package jaeger // import "go.opentelemetry.io/otel/exporters/jaeger"
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import (
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"context"
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"encoding/binary"
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"encoding/json"
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"fmt"
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"sync"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/codes"
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gen "go.opentelemetry.io/otel/exporters/jaeger/internal/gen-go/jaeger"
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"go.opentelemetry.io/otel/sdk/resource"
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sdktrace "go.opentelemetry.io/otel/sdk/trace"
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semconv "go.opentelemetry.io/otel/semconv/v1.17.0"
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"go.opentelemetry.io/otel/trace"
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)
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const (
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keyInstrumentationLibraryName = "otel.library.name"
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keyInstrumentationLibraryVersion = "otel.library.version"
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keyError = "error"
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keySpanKind = "span.kind"
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keyStatusCode = "otel.status_code"
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keyStatusMessage = "otel.status_description"
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keyDroppedAttributeCount = "otel.event.dropped_attributes_count"
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keyEventName = "event"
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)
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// New returns an OTel Exporter implementation that exports the collected
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// spans to Jaeger.
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func New(endpointOption EndpointOption) (*Exporter, error) {
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uploader, err := endpointOption.newBatchUploader()
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if err != nil {
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return nil, err
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}
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// Fetch default service.name from default resource for backup
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var defaultServiceName string
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defaultResource := resource.Default()
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if value, exists := defaultResource.Set().Value(semconv.ServiceNameKey); exists {
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defaultServiceName = value.AsString()
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}
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if defaultServiceName == "" {
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return nil, fmt.Errorf("failed to get service name from default resource")
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}
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stopCh := make(chan struct{})
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e := &Exporter{
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uploader: uploader,
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stopCh: stopCh,
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defaultServiceName: defaultServiceName,
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}
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return e, nil
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}
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// Exporter exports OpenTelemetry spans to a Jaeger agent or collector.
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type Exporter struct {
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uploader batchUploader
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stopOnce sync.Once
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stopCh chan struct{}
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defaultServiceName string
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}
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var _ sdktrace.SpanExporter = (*Exporter)(nil)
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// ExportSpans transforms and exports OpenTelemetry spans to Jaeger.
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func (e *Exporter) ExportSpans(ctx context.Context, spans []sdktrace.ReadOnlySpan) error {
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// Return fast if context is already canceled or Exporter shutdown.
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select {
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case <-ctx.Done():
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return ctx.Err()
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case <-e.stopCh:
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return nil
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default:
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}
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// Cancel export if Exporter is shutdown.
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var cancel context.CancelFunc
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ctx, cancel = context.WithCancel(ctx)
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defer cancel()
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go func(ctx context.Context, cancel context.CancelFunc) {
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select {
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case <-ctx.Done():
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case <-e.stopCh:
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cancel()
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}
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}(ctx, cancel)
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for _, batch := range jaegerBatchList(spans, e.defaultServiceName) {
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if err := e.uploader.upload(ctx, batch); err != nil {
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return err
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}
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}
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return nil
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}
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// Shutdown stops the Exporter. This will close all connections and release
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// all resources held by the Exporter.
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func (e *Exporter) Shutdown(ctx context.Context) error {
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// Stop any active and subsequent exports.
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e.stopOnce.Do(func() { close(e.stopCh) })
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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}
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return e.uploader.shutdown(ctx)
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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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}{
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Type: "jaeger",
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}
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}
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func spanToThrift(ss sdktrace.ReadOnlySpan) *gen.Span {
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attr := ss.Attributes()
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tags := make([]*gen.Tag, 0, len(attr))
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for _, kv := range attr {
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tag := keyValueToTag(kv)
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if tag != nil {
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tags = append(tags, tag)
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}
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}
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if is := ss.InstrumentationScope(); is.Name != "" {
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tags = append(tags, getStringTag(keyInstrumentationLibraryName, is.Name))
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if is.Version != "" {
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tags = append(tags, getStringTag(keyInstrumentationLibraryVersion, is.Version))
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}
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}
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if ss.SpanKind() != trace.SpanKindInternal {
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tags = append(tags,
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getStringTag(keySpanKind, ss.SpanKind().String()),
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)
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}
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if ss.Status().Code != codes.Unset {
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switch ss.Status().Code {
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case codes.Ok:
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tags = append(tags, getStringTag(keyStatusCode, "OK"))
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case codes.Error:
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tags = append(tags, getBoolTag(keyError, true))
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tags = append(tags, getStringTag(keyStatusCode, "ERROR"))
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}
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if ss.Status().Description != "" {
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tags = append(tags, getStringTag(keyStatusMessage, ss.Status().Description))
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}
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}
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var logs []*gen.Log
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for _, a := range ss.Events() {
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nTags := len(a.Attributes)
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if a.Name != "" {
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nTags++
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}
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if a.DroppedAttributeCount != 0 {
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nTags++
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}
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fields := make([]*gen.Tag, 0, nTags)
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if a.Name != "" {
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// If an event contains an attribute with the same key, it needs
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// to be given precedence and overwrite this.
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fields = append(fields, getStringTag(keyEventName, a.Name))
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}
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for _, kv := range a.Attributes {
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tag := keyValueToTag(kv)
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if tag != nil {
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fields = append(fields, tag)
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}
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}
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if a.DroppedAttributeCount != 0 {
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fields = append(fields, getInt64Tag(keyDroppedAttributeCount, int64(a.DroppedAttributeCount)))
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}
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logs = append(logs, &gen.Log{
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Timestamp: a.Time.UnixNano() / 1000,
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Fields: fields,
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})
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}
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var refs []*gen.SpanRef
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for _, link := range ss.Links() {
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tid := link.SpanContext.TraceID()
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sid := link.SpanContext.SpanID()
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refs = append(refs, &gen.SpanRef{
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TraceIdHigh: int64(binary.BigEndian.Uint64(tid[0:8])),
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TraceIdLow: int64(binary.BigEndian.Uint64(tid[8:16])),
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SpanId: int64(binary.BigEndian.Uint64(sid[:])),
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RefType: gen.SpanRefType_FOLLOWS_FROM,
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})
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}
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tid := ss.SpanContext().TraceID()
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sid := ss.SpanContext().SpanID()
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psid := ss.Parent().SpanID()
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return &gen.Span{
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TraceIdHigh: int64(binary.BigEndian.Uint64(tid[0:8])),
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TraceIdLow: int64(binary.BigEndian.Uint64(tid[8:16])),
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SpanId: int64(binary.BigEndian.Uint64(sid[:])),
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ParentSpanId: int64(binary.BigEndian.Uint64(psid[:])),
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OperationName: ss.Name(), // TODO: if span kind is added then add prefix "Sent"/"Recv"
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Flags: int32(ss.SpanContext().TraceFlags()),
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StartTime: ss.StartTime().UnixNano() / 1000,
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Duration: ss.EndTime().Sub(ss.StartTime()).Nanoseconds() / 1000,
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Tags: tags,
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Logs: logs,
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References: refs,
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}
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}
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func keyValueToTag(keyValue attribute.KeyValue) *gen.Tag {
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var tag *gen.Tag
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switch keyValue.Value.Type() {
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case attribute.STRING:
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s := keyValue.Value.AsString()
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tag = &gen.Tag{
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Key: string(keyValue.Key),
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VStr: &s,
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VType: gen.TagType_STRING,
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}
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case attribute.BOOL:
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b := keyValue.Value.AsBool()
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tag = &gen.Tag{
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Key: string(keyValue.Key),
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VBool: &b,
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VType: gen.TagType_BOOL,
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}
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case attribute.INT64:
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i := keyValue.Value.AsInt64()
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tag = &gen.Tag{
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Key: string(keyValue.Key),
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VLong: &i,
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VType: gen.TagType_LONG,
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}
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case attribute.FLOAT64:
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f := keyValue.Value.AsFloat64()
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tag = &gen.Tag{
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Key: string(keyValue.Key),
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VDouble: &f,
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VType: gen.TagType_DOUBLE,
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}
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case attribute.BOOLSLICE,
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attribute.INT64SLICE,
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attribute.FLOAT64SLICE,
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attribute.STRINGSLICE:
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data, _ := json.Marshal(keyValue.Value.AsInterface())
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a := (string)(data)
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tag = &gen.Tag{
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Key: string(keyValue.Key),
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VStr: &a,
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VType: gen.TagType_STRING,
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}
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}
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return tag
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}
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func getInt64Tag(k string, i int64) *gen.Tag {
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return &gen.Tag{
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Key: k,
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VLong: &i,
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VType: gen.TagType_LONG,
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}
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}
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func getStringTag(k, s string) *gen.Tag {
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return &gen.Tag{
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Key: k,
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VStr: &s,
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VType: gen.TagType_STRING,
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}
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}
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func getBoolTag(k string, b bool) *gen.Tag {
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return &gen.Tag{
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Key: k,
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VBool: &b,
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VType: gen.TagType_BOOL,
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}
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}
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// jaegerBatchList transforms a slice of spans into a slice of jaeger Batch.
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func jaegerBatchList(ssl []sdktrace.ReadOnlySpan, defaultServiceName string) []*gen.Batch {
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if len(ssl) == 0 {
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return nil
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}
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batchDict := make(map[attribute.Distinct]*gen.Batch)
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for _, ss := range ssl {
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if ss == nil {
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continue
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}
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resourceKey := ss.Resource().Equivalent()
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batch, bOK := batchDict[resourceKey]
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if !bOK {
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batch = &gen.Batch{
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Process: process(ss.Resource(), defaultServiceName),
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Spans: []*gen.Span{},
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}
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}
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batch.Spans = append(batch.Spans, spanToThrift(ss))
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batchDict[resourceKey] = batch
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}
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// Transform the categorized map into a slice
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batchList := make([]*gen.Batch, 0, len(batchDict))
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for _, batch := range batchDict {
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batchList = append(batchList, batch)
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}
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return batchList
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}
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// process transforms an OTel Resource into a jaeger Process.
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func process(res *resource.Resource, defaultServiceName string) *gen.Process {
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var process gen.Process
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var serviceName attribute.KeyValue
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if res != nil {
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for iter := res.Iter(); iter.Next(); {
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if iter.Attribute().Key == semconv.ServiceNameKey {
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serviceName = iter.Attribute()
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// Don't convert service.name into tag.
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continue
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}
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if tag := keyValueToTag(iter.Attribute()); tag != nil {
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process.Tags = append(process.Tags, tag)
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}
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}
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}
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// If no service.name is contained in a Span's Resource,
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// that field MUST be populated from the default Resource.
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if serviceName.Value.AsString() == "" {
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serviceName = semconv.ServiceName(defaultServiceName)
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}
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process.ServiceName = serviceName.Value.AsString()
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return &process
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}
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