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client.go
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client.go
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// 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"
"github.com/opentracing/opentracing-go"
"github.com/uber/tchannel-go"
"github.com/uber/tchannel-go/thrift"
"go.uber.org/zap"
"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
"github.com/jaegertracing/jaeger/examples/hotrod/services/driver/thrift-gen/driver"
)
// Client is a remote client that implements driver.Interface
type Client struct {
tracer opentracing.Tracer
logger log.Factory
ch *tchannel.Channel
client driver.TChanDriver
}
// NewClient creates a new driver.Client
func NewClient(tracer opentracing.Tracer, logger log.Factory, hostPort string) *Client {
channelOpts := &tchannel.ChannelOptions{
//Logger: logger,
//StatsReporter: statsReporter,
Tracer: tracer,
}
ch, err := tchannel.NewChannel("driver-client", channelOpts)
if err != nil {
logger.Bg().Fatal("Cannot create TChannel", zap.Error(err))
}
clientOpts := &thrift.ClientOptions{
HostPort: hostPort,
}
thriftClient := thrift.NewClient(ch, "driver", clientOpts)
client := driver.NewTChanDriverClient(thriftClient)
return &Client{
tracer: tracer,
logger: logger,
ch: ch,
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()
results, err := c.client.FindNearest(thrift.Wrap(ctx), location)
if err != nil {
return nil, err
}
return fromThrift(results), nil
}
func fromThrift(results []*driver.DriverLocation) []Driver {
retMe := make([]Driver, len(results))
for i, result := range results {
retMe[i] = Driver{
DriverID: result.DriverID,
Location: result.Location,
}
}
return retMe
}