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client.go
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client.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2017 Uber Technologies, Inc.
//
// 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 driver
import (
"context"
"time"
"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials/insecure"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
)
// Client is a remote client that implements driver.Interface
type Client struct {
logger log.Factory
client DriverServiceClient
}
// NewClient creates a new driver.Client
func NewClient(tracerProvider trace.TracerProvider, logger log.Factory, hostPort string) *Client {
conn, err := grpc.NewClient(hostPort,
grpc.WithTransportCredentials(insecure.NewCredentials()),
grpc.WithStatsHandler(otelgrpc.NewClientHandler(otelgrpc.WithTracerProvider(tracerProvider))),
)
if err != nil {
logger.Bg().Fatal("Cannot create gRPC connection", zap.Error(err))
}
client := NewDriverServiceClient(conn)
return &Client{
logger: logger,
client: client,
}
}
// FindNearest implements driver.Interface#FindNearest as an RPC
func (c *Client) FindNearest(ctx context.Context, location string) ([]Driver, error) {
c.logger.For(ctx).Info("Finding nearest drivers", zap.String("location", location))
ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
defer cancel()
response, err := c.client.FindNearest(ctx, &DriverLocationRequest{Location: location})
if err != nil {
return nil, err
}
return fromProto(response), nil
}
func fromProto(response *DriverLocationResponse) []Driver {
retMe := make([]Driver, len(response.Locations))
for i, result := range response.Locations {
retMe[i] = Driver{
DriverID: result.DriverID,
Location: result.Location,
}
}
return retMe
}