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111 lines
3.3 KiB
111 lines
3.3 KiB
// Copyright (c) 2019 The Jaeger Authors.
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// Copyright (c) 2017 Uber Technologies, Inc.
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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 driver
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import (
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"context"
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"encoding/json"
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"net"
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"go.opentelemetry.io/contrib/instrumentation/google.golang.org/grpc/otelgrpc"
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"go.uber.org/zap"
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"google.golang.org/grpc"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/log"
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"github.com/jaegertracing/jaeger/examples/hotrod/pkg/tracing"
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"github.com/jaegertracing/jaeger/pkg/metrics"
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)
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// Server implements jaeger-demo-frontend service
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type Server struct {
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hostPort string
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logger log.Factory
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redis *Redis
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server *grpc.Server
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}
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var _ DriverServiceServer = (*Server)(nil)
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// NewServer creates a new driver.Server
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func NewServer(hostPort string, otelExporter string, metricsFactory metrics.Factory, logger log.Factory) *Server {
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tracerProvider := tracing.InitOTEL("driver", otelExporter, metricsFactory, logger)
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server := grpc.NewServer(
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grpc.StatsHandler(otelgrpc.NewServerHandler(otelgrpc.WithTracerProvider(tracerProvider))),
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)
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return &Server{
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hostPort: hostPort,
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logger: logger,
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server: server,
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redis: newRedis(otelExporter, metricsFactory, logger),
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}
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}
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// Run starts the Driver server
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func (s *Server) Run() error {
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lis, err := net.Listen("tcp", s.hostPort)
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if err != nil {
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s.logger.Bg().Fatal("Unable to create http listener", zap.Error(err))
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}
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RegisterDriverServiceServer(s.server, s)
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s.logger.Bg().Info("Starting", zap.String("address", s.hostPort), zap.String("type", "gRPC"))
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err = s.server.Serve(lis)
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if err != nil {
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s.logger.Bg().Fatal("Unable to start gRPC server", zap.Error(err))
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}
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return err
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}
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// FindNearest implements gRPC driver interface
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func (s *Server) FindNearest(ctx context.Context, location *DriverLocationRequest) (*DriverLocationResponse, error) {
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s.logger.For(ctx).Info("Searching for nearby drivers", zap.String("location", location.Location))
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driverIDs := s.redis.FindDriverIDs(ctx, location.Location)
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locations := make([]*DriverLocation, len(driverIDs))
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for i, driverID := range driverIDs {
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var drv Driver
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var err error
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for i := 0; i < 3; i++ {
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drv, err = s.redis.GetDriver(ctx, driverID)
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if err == nil {
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break
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}
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s.logger.For(ctx).Error("Retrying GetDriver after error", zap.Int("retry_no", i+1), zap.Error(err))
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}
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if err != nil {
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s.logger.For(ctx).Error("Failed to get driver after 3 attempts", zap.Error(err))
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return nil, err
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}
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locations[i] = &DriverLocation{
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DriverID: drv.DriverID,
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Location: drv.Location,
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}
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}
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s.logger.For(ctx).Info(
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"Search successful",
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zap.Int("driver_count", len(locations)),
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zap.String("locations", toJSON(locations)),
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)
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return &DriverLocationResponse{Locations: locations}, nil
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}
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func toJSON(v any) string {
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str, err := json.Marshal(v)
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if err != nil {
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return err.Error()
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}
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return string(str)
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}
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