/
otel_handler.go
131 lines (110 loc) · 3.36 KB
/
otel_handler.go
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/*
Copyright Agoda Services Co.,Ltd.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package otelslog
import (
"context"
otel "github.com/agoda-com/opentelemetry-logs-go/logs"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/instrumentation"
semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
"go.opentelemetry.io/otel/trace"
"io"
"log/slog"
"sync"
)
const (
instrumentationName = "github.com/agoda-com/otelslog"
)
// OtelHandler is a Handler that writes Records to OTLP
type OtelHandler struct {
otelHandler
}
type otelHandler struct {
logger otel.Logger
opts HandlerOptions
mu *sync.Mutex
w io.Writer
}
// compilation time verification handler implement interface
var _ slog.Handler = &otelHandler{}
var instrumentationScope = instrumentation.Scope{
Name: instrumentationName,
Version: Version(),
SchemaURL: semconv.SchemaURL,
}
func (o otelHandler) Enabled(ctx context.Context, level slog.Level) bool {
return true
}
func (o otelHandler) Handle(ctx context.Context, record slog.Record) error {
spanContext := trace.SpanFromContext(ctx).SpanContext()
var traceID *trace.TraceID = nil
var spanID *trace.SpanID = nil
var traceFlags *trace.TraceFlags = nil
if spanContext.IsValid() {
tid := spanContext.TraceID()
sid := spanContext.SpanID()
tf := spanContext.TraceFlags()
traceID = &tid
spanID = &sid
traceFlags = &tf
}
levelString := record.Level.String()
severity := otel.SeverityNumber(int(record.Level.Level()) + 9)
var attributes []attribute.KeyValue
record.Attrs(func(attr slog.Attr) bool {
attributes = append(attributes, otelAttribute(attr)...)
return true
})
lrc := otel.LogRecordConfig{
Timestamp: &record.Time,
ObservedTimestamp: record.Time,
TraceId: traceID,
SpanId: spanID,
TraceFlags: traceFlags,
SeverityText: &levelString,
SeverityNumber: &severity,
Body: &record.Message,
Resource: nil,
InstrumentationScope: &instrumentationScope,
Attributes: &attributes,
}
r := otel.NewLogRecord(lrc)
o.logger.Emit(r)
return nil
}
func (o otelHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
//TODO implement me
panic("not implemented yet")
}
func (o otelHandler) WithGroup(name string) slog.Handler {
//TODO implement me
panic("not implemented yet")
}
// HandlerOptions are options for a OtelHandler.
// A zero HandlerOptions consists entirely of default values.
type HandlerOptions struct {
}
// NewOtelHandler creates a OtelHandler that writes to otlp,
// using the given options.
// If opts is nil, the default options are used.
func NewOtelHandler(loggerProvider otel.LoggerProvider, opts *HandlerOptions) *OtelHandler {
logger := loggerProvider.Logger(
instrumentationScope.Name,
otel.WithInstrumentationVersion(instrumentationScope.Version),
)
return &OtelHandler{
otelHandler{
logger: logger,
},
}
}