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// Copyright The OpenTelemetry Authors
//
// 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 otlptracegrpc
import (
"context"
"sync"
"time"
"github.com/pkg/errors"
"go.opentelemetry.io/otel/exporters/otlp/otlptrace"
coltracepb "go.opentelemetry.io/proto/otlp/collector/trace/v1"
tracepb "go.opentelemetry.io/proto/otlp/trace/v1"
"google.golang.org/grpc"
)
type client struct {
connection *Connection
lock sync.Mutex
tracesClient coltracepb.TraceServiceClient
}
var _ otlptrace.Client = (*client)(nil)
// NewClient creates a new gRPC trace client.
func NewClient(cc *grpc.ClientConn) otlptrace.Client {
c := &client{}
c.connection = NewConnection(cc, c.handleNewConnection)
return c
}
func (c *client) handleNewConnection(cc *grpc.ClientConn) {
c.lock.Lock()
defer c.lock.Unlock()
if cc != nil {
c.tracesClient = coltracepb.NewTraceServiceClient(cc)
} else {
c.tracesClient = nil
}
}
// Start establishes a connection to the collector.
func (c *client) Start(ctx context.Context) error {
return c.connection.StartConnection(ctx)
}
// Stop shuts down the connection to the collector.
func (c *client) Stop(ctx context.Context) error {
return c.connection.Shutdown(ctx)
}
// UploadTraces sends a batch of spans to the collector.
func (c *client) UploadTraces(ctx context.Context, protoSpans []*tracepb.ResourceSpans) error {
if !c.connection.Connected() {
return errors.Wrap(c.connection.LastConnectError(), "traces exporter is disconnected from the server")
}
ctx, cancel := c.connection.ContextWithStop(ctx)
defer cancel(errors.WithStack(context.Canceled))
ctx, tCancel := context.WithCancelCause(ctx)
ctx, _ = context.WithTimeoutCause(ctx, 30*time.Second, errors.WithStack(context.DeadlineExceeded))
defer tCancel(errors.WithStack(context.Canceled))
ctx = c.connection.ContextWithMetadata(ctx)
err := func() error {
c.lock.Lock()
defer c.lock.Unlock()
if c.tracesClient == nil {
return errNoClient
}
_, err := c.tracesClient.Export(ctx, &coltracepb.ExportTraceServiceRequest{
ResourceSpans: protoSpans,
})
return err
}()
if err != nil {
c.connection.SetStateDisconnected(err)
}
return err
}
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