一，client.go 客户端主程序
主要内容在注释部分
package main
import (
"context"
"flag"
"io"
"log"
"math/rand"
"time"
"google.golang/grpc"
"google.golang/grpc/credentials"
"google.golang/grpc/credentials/insecure"
"google.golang/grpc/examples/data"
pb "google.golang/grpc/examples/route_guide/routeguide"
)
var (
tls = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
caFile = flag.String("ca_file", "", "The file containing the CA root cert file")
serverAddr = flag.String("addr", "localhost:50051", "The server address in the format of host:port")
serverHostOverride = flag.String("server_host_override", "x.test.example", "The server name used to verify the hostname returned by the TLS handshake")
)
// 双端一元式
func printFeature(client pb.RouteGuideClient, point *pb.Point) {
log.Printf("Getting feature for point (%d, %d)", point.Latitude, point.Longitude)
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// 客户端调用双端一元式的函数获取服务端返回结果
feature, err := client.GetFeature(ctx, point)
if err != nil {
log.Fatalf("%v.GetFeatures(_) = _, %v: ", client, err)
}
log.Println(feature)
}
// 服务端流式
func printFeatures(client pb.RouteGuideClient, rect *pb.Rectangle) {
log.Printf("Looking for features within %v", rect)
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// 客户端调用服务端流式的函数获取服务端返回的流
stream, err := client.ListFeatures(ctx, rect)
if err != nil {
log.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
}
for {
// 从流中循环获取服务端写入的内容，直到末尾，Recv方法，在route_guide_grpc.pb.go中实现
feature, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
log.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
}
log.Printf("Feature: name: %q, point:(%v, %v)", feature.GetName(),
feature.GetLocation().GetLatitude(), feature.GetLocation().GetLongitude())
}
}
// 客户端流式
func runRecordRoute(client pb.RouteGuideClient) {
// Create a random number of random points
r := rand.New(rand.NewSource(time.Now().UnixNano()))
pointCount := int(r.Int31n(100)) + 2 // Traverse at least two points
var points []*pb.Point
for i := 0; i < pointCount; i++ {
points = append(points, randomPoint(r))
}
log.Printf("Traversing %d points.", len(points))
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// 客户端调用客户端流式的函数获取服务端返回的流
stream, err := client.RecordRoute(ctx)
if err != nil {
log.Fatalf("%v.RecordRoute(_) = _, %v", client, err)
}
for _, point := range points {
// 多次往流中写入内容，Send方法，在route_guide_grpc.pb.go中实现
if err := stream.Send(point); err != nil {
log.Fatalf("%v.Send(%v) = %v", stream, point, err)
}
}
// 关闭流，并获取服务端的返回结果，CloseAndRecv方法，在route_guide_grpc.pb.go中实现
reply, err := stream.CloseAndRecv()
if err != nil {
log.Fatalf("%v.CloseAndRecv() got error %v, want %v", stream, err, nil)
}
log.Printf("Route summary: %v", reply)
}
// 双端双流式
func runRouteChat(client pb.RouteGuideClient) {
notes := []*pb.RouteNote{
{Location: &pb.Point{Latitude: 0, Longitude: 1}, Message: "First message"},
{Location: &pb.Point{Latitude: 0, Longitude: 2}, Message: "Second message"},
{Location: &pb.Point{Latitude: 0, Longitude: 3}, Message: "Third message"},
{Location: &pb.Point{Latitude: 0, Longitude: 1}, Message: "Fourth message"},
{Location: &pb.Point{Latitude: 0, Longitude: 2}, Message: "Fifth message"},
{Location: &pb.Point{Latitude: 0, Longitude: 3}, Message: "Sixth message"},
}
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
defer cancel()
// 客户端调用双端双流式的函数，获取服务端返回的流
stream, err := client.RouteChat(ctx)
if err != nil {
log.Fatalf("%v.RouteChat(_) = _, %v", client, err)
}
waitc := make(chan struct{})
go func() {
for {
// 单起一个协程，从流中获取服务端输入的内容，Recv方法，在route_guide_grpc.pb.go中实现
in, err := stream.Recv()
if err == io.EOF {
close(waitc) // 表示流读取内容完成
return
}
if err != nil {
log.Fatalf("Failed to receive a note : %v", err)
}
log.Printf("Got message %s at point(%d, %d)", in.Message, in.Location.Latitude, in.Location.Longitude)
}
}()
for _, note := range notes {
// 多次往流中写入内容发送到服务端，Send方法，在route_guide_grpc.pb.go中实现
if err := stream.Send(note); err != nil {
log.Fatalf("Failed to send a note: %v", err)
}
}
stream.CloseSend() // 表示流写入内容完成
<-waitc // 等待单起的协程读取内容完毕
}
func randomPoint(r *rand.Rand) *pb.Point {
lat := (r.Int31n(180) - 90) * 1e7
long := (r.Int31n(360) - 180) * 1e7
return &pb.Point{Latitude: lat, Longitude: long}
}
func main() {
flag.Parse()
var opts []grpc.DialOption
if *tls {
// grpc支持tls连接，通过ca证书验证
if *caFile == "" {
*caFile = data.Path("x509/ca_cert.pem")
}
creds, err := credentials.NewClientTLSFromFile(*caFile, *serverHostOverride)
if err != nil {
log.Fatalf("Failed to create TLS credentials %v", err)
}
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithTransportCredentials(insecure.NewCredentials()))
}
// 与grpc服务端创建连接
conn, err := grpc.Dial(*serverAddr, opts...)
if err != nil {
log.Fatalf("fail to dial: %v", err)
}
defer conn.Close()
// 从grpc连接中创建某个服务的客户端，当前服务为RouteGuideClient（可以从一个grpc服务中创建多个服务的客户端）
client := pb.NewRouteGuideClient(conn)
// 双端一元式
printFeature(client, &pb.Point{Latitude: 409146138, Longitude: -746188906})
printFeature(client, &pb.Point{Latitude: 0, Longitude: 0})
// 服务端流式
printFeatures(client, &pb.Rectangle{
Lo: &pb.Point{Latitude: 400000000, Longitude: -750000000},
Hi: &pb.Point{Latitude: 420000000, Longitude: -730000000},
})
// 客户端流式
runRecordRoute(client)
// 双端双流式
runRouteChat(client)
}
二、server.go 服务端主程序
package main
import (
"context"
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"net"
"sync"
"time"
"google.golang/grpc"
"google.golang/grpc/credentials"
"google.golang/grpc/examples/data"
"github/golang/protobuf/proto"
pb "google.golang/grpc/examples/route_guide/routeguide"
)
var (
tls = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
certFile = flag.String("cert_file", "", "The TLS cert file")
keyFile = flag.String("key_file", "", "The TLS key file")
jsonDBFile = flag.String("json_db_file", "", "A json file containing a list of features")
port = flag.Int("port", 50051, "The server port")
)
// 服务端结构体，继承route_guide_grpc.pb.go中未实现的服务端结构体UnimplementedRouteGuideServer
// 并重写了其声明的方法，即服务端处理客户端请求的逻辑体，成为其子类，以实现多态
type routeGuideServer struct {
pb.UnimplementedRouteGuideServer
savedFeatures []*pb.Feature // read-only after initialized
mu sync.Mutex // protects routeNotes
routeNotes map[string][]*pb.RouteNote
}
// 双端一流式，重写了UnimplementedRouteGuideServer的该方法
func (s *routeGuideServer) GetFeature(ctx context.Context, point *pb.Point) (*pb.Feature, error) {
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
return feature, nil
}
}
// No feature was found, return an unnamed feature
return &pb.Feature{Location: point}, nil
}
// 服务端流式，重写了UnimplementedRouteGuideServer的该方法
func (s *routeGuideServer) ListFeatures(rect *pb.Rectangle, stream pb.RouteGuide_ListFeaturesServer) error {
for _, feature := range s.savedFeatures {
if inRange(feature.Location, rect) {
// 多次往流中写入内容，Send方法，在route_guide_grpc.pb.go中实现
if err := stream.Send(feature); err != nil {
return err
}
}
}
return nil
}
// 客户端流式，重写了UnimplementedRouteGuideServer的该方法
func (s *routeGuideServer) RecordRoute(stream pb.RouteGuide_RecordRouteServer) error {
var pointCount, featureCount, distance int32
var lastPoint *pb.Point
startTime := time.Now()
for {
// 多次从流中获取客户端写入的内容
point, err := stream.Recv()
if err == io.EOF {
endTime := time.Now()
// 流读取完毕，返回结果并关闭流，SendAndClose方法，在route_guide_grpc.pb.go中实现
return stream.SendAndClose(&pb.RouteSummary{
PointCount: pointCount,
FeatureCount: featureCount,
Distance: distance,
ElapsedTime: int32(endTime.Sub(startTime).Seconds()),
})
}
if err != nil {
return err
}
pointCount++
for _, feature := range s.savedFeatures {
if proto.Equal(feature.Location, point) {
featureCount++
}
}
if lastPoint != nil {
distance += calcDistance(lastPoint, point)
}
lastPoint = point
}
}
// 双端双流式，重写了UnimplementedRouteGuideServer的该方法
func (s *routeGuideServer) RouteChat(stream pb.RouteGuide_RouteChatServer) error {
for {
// 多次从流中获取客户端写入的内容，Recv方法，在route_guide_grpc.pb.go中实现
in, err := stream.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
key := serialize(in.Location)
s.mu.Lock()
s.routeNotes[key] = append(s.routeNotes[key], in)
// Note: this copy prevents blocking other clients while serving this one.
// We don't need to do a deep copy, because elements in the slice are
// insert-only and never modified.
rn := make([]*pb.RouteNote, len(s.routeNotes[key]))
copy(rn, s.routeNotes[key])
s.mu.Unlock()
for _, note := range rn {
// 多次往流中写入内容，Send方法，在route_guide_grpc.pb.go中实现
if err := stream.Send(note); err != nil {
return err
}
}
}
}
// loadFeatures loads features from a JSON file.
func (s *routeGuideServer) loadFeatures(filePath string) {
var data []byte
if filePath != "" {
var err error
data, err = ioutil.ReadFile(filePath)
if err != nil {
log.Fatalf("Failed to load default features: %v", err)
}
} else {
data = exampleData
}
if err := json.Unmarshal(data, &s.savedFeatures); err != nil {
log.Fatalf("Failed to load default features: %v", err)
}
}
func toRadians(num float64) float64 {
return num * math.Pi / float64(180)
}
// calcDistance calculates the distance between two points using the "haversine" formula.
// The formula is based on http://mathforum/library/drmath/view/51879.html.
func calcDistance(p1 *pb.Point, p2 *pb.Point) int32 {
const CordFactor float64 = 1e7
const R = float64(6371000) // earth radius in metres
lat1 := toRadians(float64(p1.Latitude) / CordFactor)
lat2 := toRadians(float64(p2.Latitude) / CordFactor)
lng1 := toRadians(float64(p1.Longitude) / CordFactor)
lng2 := toRadians(float64(p2.Longitude) / CordFactor)
dlat := lat2 - lat1
dlng := lng2 - lng1
a := math.Sin(dlat/2)*math.Sin(dlat/2) +
math.Cos(lat1)*math.Cos(lat2)*
math.Sin(dlng/2)*math.Sin(dlng/2)
c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
distance := R * c
return int32(distance)
}
func inRange(point *pb.Point, rect *pb.Rectangle) bool {
left := math.Min(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
right := math.Max(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
top := math.Max(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
bottom := math.Min(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
if float64(point.Longitude) >= left &&
float64(point.Longitude) <= right &&
float64(point.Latitude) >= bottom &&
float64(point.Latitude) <= top {
return true
}
return false
}
func serialize(point *pb.Point) string {
return fmt.Sprintf("%d %d", point.Latitude, point.Longitude)
}
func newServer() *routeGuideServer {
s := &routeGuideServer{routeNotes: make(map[string][]*pb.RouteNote)}
s.loadFeatures(*jsonDBFile)
return s
}
func main() {
flag.Parse()
lis, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port))
if err != nil {
log.Fatalf("failed to listen: %v", err)
}
var opts []grpc.ServerOption
if *tls {
// 判断是否需要tls验证
if *certFile == "" {
*certFile = data.Path("x509/server_cert.pem")
}
if *keyFile == "" {
*keyFile = data.Path("x509/server_key.pem")
}
creds, err := credentials.NewServerTLSFromFile(*certFile, *keyFile)
if err != nil {
log.Fatalf("Failed to generate credentials %v", err)
}
opts = []grpc.ServerOption{grpc.Creds(creds)}
}
// 创建一个grpc服务
grpcServer := grpc.NewServer(opts...)
// 将当前服务注册到grpc服务中
pb.RegisterRouteGuideServer(grpcServer, newServer())
// grpc服务接收监听到的连接，并创建一个单独的协程，然后调用已注册的处理程序来响应
grpcServer.Serve(lis)
}
// exampleData is a copy of testdata/route_guide_db.json. It's to avoid
// specifying file path with `go run`.
var exampleData = []byte(`[{
"location": {
"latitude": 407838351,
"longitude": -746143763
},
"name": "Patriots Path, Mendham, NJ 07945, USA"
}, {
"location": {
"latitude": 408122808,
"longitude": -743999179
},
"name": "101 New Jersey 10, Whippany, NJ 07981, USA"
}, {
"location": {
"latitude": 413628156,
"longitude": -749015468
},
"name": "U.S. 6, Shohola, PA 18458, USA"
}, {
"location": {
"latitude": 419999544,
"longitude": -740371136
},
"name": "5 Conners Road, Kingston, NY 12401, USA"
}, {
"location": {
"latitude": 414008389,
"longitude": -743951297
},
"name": "Mid Hudson Psychiatric Center, New Hampton, NY 10958, USA"
}, {
"location": {
"latitude": 419611318,
"longitude": -746524769
},
"name": "287 Flugertown Road, Livingston Manor, NY 12758, USA"
}, {
"location": {
"latitude": 406109563,
"longitude": -742186778
},
"name": "4001 Tremley Point Road, Linden, NJ 07036, USA"
}, {
"location": {
"latitude": 416802456,
"longitude": -742370183
},
"name": "352 South Mountain Road, Wallkill, NY 12589, USA"
}, {
"location": {
"latitude": 412950425,
"longitude": -741077389
},
"name": "Bailey Turn Road, Harriman, NY 10926, USA"
}, {
"location": {
"latitude": 412144655,
"longitude": -743949739
},
"name": "193-199 Wawayanda Road, Hewitt, NJ 07421, USA"
}, {
"location": {
"latitude": 415736605,
"longitude": -742847522
},
"name": "406-496 Ward Avenue, Pine Bush, NY 12566, USA"
}, {
"location": {
"latitude": 413843930,
"longitude": -740501726
},
"name": "162 Merrill Road, Highland Mills, NY 10930, USA"
}, {
"location": {
"latitude": 410873075,
"longitude": -744459023
},
"name": "Clinton Road, West Milford, NJ 07480, USA"
}, {
"location": {
"latitude": 412346009,
"longitude": -744026814
},
"name": "16 Old Brook Lane, Warwick, NY 10990, USA"
}, {
"location": {
"latitude": 402948455,
"longitude": -747903913
},
"name": "3 Drake Lane, Pennington, NJ 08534, USA"
}, {
"location": {
"latitude": 406337092,
"longitude": -740122226
},
"name": "6324 8th Avenue, Brooklyn, NY 11220, USA"
}, {
"location": {
"latitude": 406421967,
"longitude": -747727624
},
"name": "1 Merck Access Road, Whitehouse Station, NJ 08889, USA"
}, {
"location": {
"latitude": 416318082,
"longitude": -749677716
},
"name": "78-98 Schalck Road, Narrowsburg, NY 12764, USA"
}, {
"location": {
"latitude": 415301720,
"longitude": -748416257
},
"name": "282 Lakeview Drive Road, Highland Lake, NY 12743, USA"
}, {
"location": {
"latitude": 402647019,
"longitude": -747071791
},
"name": "330 Evelyn Avenue, Hamilton Township, NJ 08619, USA"
}, {
"location": {
"latitude": 412567807,
"longitude": -741058078
},
"name": "New York State Reference Route 987E, Southfields, NY 10975, USA"
}, {
"location": {
"latitude": 416855156,
"longitude": -744420597
},
"name": "103-271 Tempaloni Road, Ellenville, NY 12428, USA"
}, {
"location": {
"latitude": 404663628,
"longitude": -744820157
},
"name": "1300 Airport Road, North Brunswick Township, NJ 08902, USA"
}, {
"location": {
"latitude": 407113723,
"longitude": -749746483
},
"name": ""
}, {
"location": {
"latitude": 402133926,
"longitude": -743613249
},
"name": ""
}, {
"location": {
"latitude": 400273442,
"longitude": -741220915
},
"name": ""
}, {
"location": {
"latitude": 411236786,
"longitude": -744070769
},
"name": ""
}, {
"location": {
"latitude": 411633782,
"longitude": -746784970
},
"name": "211-225 Plains Road, Augusta, NJ 07822, USA"
}, {
"location": {
"latitude": 415830701,
"longitude": -742952812
},
"name": ""
}, {
"location": {
"latitude": 413447164,
"longitude": -748712898
},
"name": "165 Pedersen Ridge Road, Milford, PA 18337, USA"
}, {
"location": {
"latitude": 405047245,
"longitude": -749800722
},
"name": "100-122 Locktown Road, Frenchtown, NJ 08825, USA"
}, {
"location": {
"latitude": 418858923,
"longitude": -746156790
},
"name": ""
}, {
"location": {
"latitude": 417951888,
"longitude": -748484944
},
"name": "650-652 Willi Hill Road, Swan Lake, NY 12783, USA"
}, {
"location": {
"latitude": 407033786,
"longitude": -743977337
},
"name": "26 East 3rd Street, New Providence, NJ 07974, USA"
}, {
"location": {
"latitude": 417548014,
"longitude": -740075041
},
"name": ""
}, {
"location": {
"latitude": 410395868,
"longitude": -744972325
},
"name": ""
}, {
"location": {
"latitude": 404615353,
"longitude": -745129803
},
"name": ""
}, {
"location": {
"latitude": 406589790,
"longitude": -743560121
},
"name": "611 Lawrence Avenue, Westfield, NJ 07090, USA"
}, {
"location": {
"latitude": 414653148,
"longitude": -740477477
},
"name": "18 Lannis Avenue, New Windsor, NY 12553, USA"
}, {
"location": {
"latitude": 405957808,
"longitude": -743255336
},
"name": "82-104 Amherst Avenue, Colonia, NJ 07067, USA"
}, {
"location": {
"latitude": 411733589,
"longitude": -741648093
},
"name": "170 Seven Lakes Drive, Sloatsburg, NY 10974, USA"
}, {
"location": {
"latitude": 412676291,
"longitude": -742606606
},
"name": "1270 Lakes Road, Monroe, NY 10950, USA"
}, {
"location": {
"latitude": 409224445,
"longitude": -748286738
},
"name": "509-535 Alphano Road, Great Meadows, NJ 07838, USA"
}, {
"location": {
"latitude": 406523420,
"longitude": -742135517
},
"name": "652 Garden Street, Elizabeth, NJ 07202, USA"
}, {
"location": {
"latitude": 401827388,
"longitude": -740294537
},
"name": "349 Sea Spray Court, Neptune City, NJ 07753, USA"
}, {
"location": {
"latitude": 410564152,
"longitude": -743685054
},
"name": "13-17 Stanley Street, West Milford, NJ 07480, USA"
}, {
"location": {
"latitude": 408472324,
"longitude": -740726046
},
"name": "47 Industrial Avenue, Teterboro, NJ 07608, USA"
}, {
"location": {
"latitude": 412452168,
"longitude": -740214052
},
"name": "5 White Oak Lane, Stony Point, NY 10980, USA"
}, {
"location": {
"latitude": 409146138,
"longitude": -746188906
},
"name": "Berkshire Valley Management Area Trail, Jefferson, NJ, USA"
}, {
"location": {
"latitude": 404701380,
"longitude": -744781745
},
"name": "1007 Jersey Avenue, New Brunswick, NJ 08901, USA"
}, {
"location": {
"latitude": 409642566,
"longitude": -746017679
},
"name": "6 East Emerald Isle Drive, Lake Hopatcong, NJ 07849, USA"
}, {
"location": {
"latitude": 408031728,
"longitude": -748645385
},
"name": "1358-1474 New Jersey 57, Port Murray, NJ 07865, USA"
}, {
"location": {
"latitude": 413700272,
"longitude": -742135189
},
"name": "367 Prospect Road, Chester, NY 10918, USA"
}, {
"location": {
"latitude": 404310607,
"longitude": -740282632
},
"name": "10 Simon Lake Drive, Atlantic Highlands, NJ 07716, USA"
}, {
"location": {
"latitude": 409319800,
"longitude": -746201391
},
"name": "11 Ward Street, Mount Arlington, NJ 07856, USA"
}, {
"location": {
"latitude": 406685311,
"longitude": -742108603
},
"name": "300-398 Jefferson Avenue, Elizabeth, NJ 07201, USA"
}, {
"location": {
"latitude": 419018117,
"longitude": -749142781
},
"name": "43 Dreher Road, Roscoe, NY 12776, USA"
}, {
"location": {
"latitude": 412856162,
"longitude": -745148837
},
"name": "Swan Street, Pine Island, NY 10969, USA"
}, {
"location": {
"latitude": 416560744,
"longitude": -746721964
},
"name": "66 Pleasantview Avenue, Monticello, NY 12701, USA"
}, {
"location": {
"latitude": 405314270,
"longitude": -749836354
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