grpc 深入
grpc 的生命周期由4种请求的方式不同而不同:(详细查看router示例)
gprc 设置超时时间:
指定的截止日期或超时时间因语言而异,并不是所有语言都有默认的最后期限。
某些语言时间是截止时间(固定时间点),而某些语言超时时间是范围 (持续时间)。
取消RPC客户端或服务器可以随时取消调用。 取消立即终止RPC。 它不是一个“撤消”:取消之前所做的更改将不会被回滚。
具有或不具有基于Google token身份验证的SSL/TLS,或者您可以通过扩展提供的代码来插入自己的身份验证系统。
google的token值能用于连接google服务,将这个token发给非google服务看能会发生被盗用的情况,并用于将客户端模拟为Google服务。
这个例子演示了客户端和服务端的集中通讯方式
将stream关键字放在响应类型之前指定服务端或客户端的方法使用流的方法。
下面是4中方式的定义:
service RouteGuide {
rpc GetFeature(Point) returns (Feature) {}
rpc ListFeatures(Rectangle) returns (stream Feature) {}
rpc RecordRoute(stream Point) returns (RouteSummary) {}
rpc RouteChat(stream RouteNote) returns (stream RouteNote) {}
}
完整定义:
syntax = "proto3";
option java_multiple_files = true;
option java_package = "io.grpc.examples.routeguide";
option java_outer_classname = "RouteGuideProto";
package pb;
// Interface exported by the server.
service RouteGuide {
// A simple RPC.
//
// Obtains the feature at a given position.
//
// A feature with an empty name is returned if there's no feature at the given
// position.
rpc GetFeature(Point) returns (Feature) {}
// A server-to-client streaming RPC.
//
// Obtains the Features available within the given Rectangle. Results are
// streamed rather than returned at once (e.g. in a response message with a
// repeated field), as the rectangle may cover a large area and contain a
// huge number of features.
rpc ListFeatures(Rectangle) returns (stream Feature) {}
// A client-to-server streaming RPC.
//
// Accepts a stream of Points on a route being traversed, returning a
// RouteSummary when traversal is completed.
rpc RecordRoute(stream Point) returns (RouteSummary) {}
// A Bidirectional streaming RPC.
//
// Accepts a stream of RouteNotes sent while a route is being traversed,
// while receiving other RouteNotes (e.g. from other users).
rpc RouteChat(stream RouteNote) returns (stream RouteNote) {}
}
// Points are represented as latitude-longitude pairs in the E7 representation
// (degrees multiplied by 10**7 and rounded to the nearest integer).
// Latitudes should be in the range +/- 90 degrees and longitude should be in
// the range +/- 180 degrees (inclusive).
message Point {
int32 latitude = 1;
int32 longitude = 2;
}
// A latitude-longitude rectangle, represented as two diagonally opposite
// points "lo" and "hi".
message Rectangle {
// One corner of the rectangle.
Point lo = 1;
// The other corner of the rectangle.
Point hi = 2;
}
// A feature names something at a given point.
//
// If a feature could not be named, the name is empty.
message Feature {
// The name of the feature.
string name = 1;
// The point where the feature is detected.
Point location = 2;
}
// A RouteNote is a message sent while at a given point.
message RouteNote {
// The location from which the message is sent.
Point location = 1;
// The message to be sent.
string message = 2;
}
// A RouteSummary is received in response to a RecordRoute rpc.
//
// It contains the number of individual points received, the number of
// detected features, and the total distance covered as the cumulative sum of
// the distance between each point.
message RouteSummary {
// The number of points received.
int32 point_count = 1;
// The number of known features passed while traversing the route.
int32 feature_count = 2;
// The distance covered in metres.
int32 distance = 3;
// The duration of the traversal in seconds.
int32 elapsed_time = 4;
}
使用上面的文件,然后在对应文件夹下生产xx.pb.go文件
protoc -I ./ route_guide.proto --go_out=plugins=grpc:.
// Package main implements a simple gRPC server that demonstrates how to use gRPC-Go libraries
// to perform unary, client streaming, server streaming and full duplex RPCs.
//
// It implements the route guide service whose definition can be found in proto/route_guide.proto.
package main
import (
"encoding/json"
"flag"
"fmt"
"io"
"io/ioutil"
"math"
"net"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"github.com/golang/protobuf/proto"
"git.oschina.net/solate/test/other/grpc/router/pb"
)
var (
tls = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
certFile = flag.String("cert_file", "testdata/server1.pem", "The TLS cert file")
keyFile = flag.String("key_file", "testdata/server1.key", "The TLS key file")
jsonDBFile = flag.String("json_db_file", "testdata/route_guide_db.json", "A json file containing a list of features")
port = flag.Int("port", 10000, "The server port")
)
type routeGuideServer struct {
savedFeatures []*pb.Feature
routeNotes map[string][]*pb.RouteNote
}
// GetFeature returns the feature at the given point.
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
}
// ListFeatures lists all features contained within the given bounding Rectangle.
func (s *routeGuideServer) ListFeatures(rect *pb.Rectangle, stream pb.RouteGuide_ListFeaturesServer) error {
for _, feature := range s.savedFeatures {
if inRange(feature.Location, rect) {
if err := stream.Send(feature); err != nil {
return err
}
}
}
return nil
}
// RecordRoute records a route composited of a sequence of points.
//
// It gets a stream of points, and responds with statistics about the "trip":
// number of points, number of known features visited, total distance traveled, and
// total time spent.
func (s *routeGuideServer) RecordRoute(stream pb.RouteGuide_RecordRouteServer) error {
var pointCount, featureCount, distance int32
var lastPoint *pb.Point
startTime := time.Now()
for {
point, err := stream.Recv()
if err == io.EOF {
endTime := time.Now()
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
}
}
// RouteChat receives a stream of message/location pairs, and responds with a stream of all
// previous messages at each of those locations.
func (s *routeGuideServer) RouteChat(stream pb.RouteGuide_RouteChatServer) error {
for {
in, err := stream.Recv()
if err == io.EOF {
return nil
}
if err != nil {
return err
}
key := serialize(in.Location)
if _, present := s.routeNotes[key]; !present {
s.routeNotes[key] = []*pb.RouteNote{in}
} else {
s.routeNotes[key] = append(s.routeNotes[key], in)
}
for _, note := range s.routeNotes[key] {
if err := stream.Send(note); err != nil {
return err
}
}
}
}
// loadFeatures loads features from a JSON file.
func (s *routeGuideServer) loadFeatures(filePath string) {
file, err := ioutil.ReadFile(filePath)
if err != nil {
grpclog.Fatalf("Failed to load default features: %v", err)
}
if err := json.Unmarshal(file, &s.savedFeatures); err != nil {
grpclog.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.
// This code was taken from http://www.movable-type.co.uk/scripts/latlong.html.
func calcDistance(p1 *pb.Point, p2 *pb.Point) int32 {
const CordFactor float64 = 1e7
const R float64 = float64(6371000) // metres
lat1 := float64(p1.Latitude) / CordFactor
lat2 := float64(p2.Latitude) / CordFactor
lng1 := float64(p1.Longitude) / CordFactor
lng2 := float64(p2.Longitude) / CordFactor
φ1 := toRadians(lat1)
φ2 := toRadians(lat2)
Δφ := toRadians(lat2 - lat1)
Δλ := toRadians(lng2 - lng1)
a := math.Sin(Δφ/2)*math.Sin(Δφ/2) +
math.Cos(φ1)*math.Cos(φ2)*
math.Sin(Δλ/2)*math.Sin(Δλ/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 := new(routeGuideServer)
s.loadFeatures(*jsonDBFile)
s.routeNotes = make(map[string][]*pb.RouteNote)
return s
}
func main() {
flag.Parse()
lis, err := net.Listen("tcp", fmt.Sprintf(":%d", *port))
if err != nil {
grpclog.Fatalf("failed to listen: %v", err)
}
var opts []grpc.ServerOption
if *tls {
creds, err := credentials.NewServerTLSFromFile(*certFile, *keyFile)
if err != nil {
grpclog.Fatalf("Failed to generate credentials %v", err)
}
opts = []grpc.ServerOption{grpc.Creds(creds)}
}
grpcServer := grpc.NewServer(opts...)
pb.RegisterRouteGuideServer(grpcServer, newServer())
grpcServer.Serve(lis)
}
// Package main implements a simple gRPC client that demonstrates how to use gRPC-Go libraries
// to perform unary, client streaming, server streaming and full duplex RPCs.
//
// It interacts with the route guide service whose definition can be found in proto/route_guide.proto.
package main
import (
"flag"
"io"
"math/rand"
"time"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
"git.oschina.net/solate/test/other/grpc/router/pb"
)
var (
tls = flag.Bool("tls", false, "Connection uses TLS if true, else plain TCP")
caFile = flag.String("ca_file", "testdata/ca.pem", "The file containning the CA root cert file")
serverAddr = flag.String("server_addr", "127.0.0.1:10000", "The server address in the format of host:port")
serverHostOverride = flag.String("server_host_override", "x.test.youtube.com", "The server name use to verify the hostname returned by TLS handshake")
)
// printFeature gets the feature for the given point.
func printFeature(client pb.RouteGuideClient, point *pb.Point) {
grpclog.Printf("Getting feature for point (%d, %d)", point.Latitude, point.Longitude)
feature, err := client.GetFeature(context.Background(), point)
if err != nil {
grpclog.Fatalf("%v.GetFeatures(_) = _, %v: ", client, err)
}
grpclog.Println(feature)
}
// printFeatures lists all the features within the given bounding Rectangle.
func printFeatures(client pb.RouteGuideClient, rect *pb.Rectangle) {
grpclog.Printf("Looking for features within %v", rect)
stream, err := client.ListFeatures(context.Background(), rect)
if err != nil {
grpclog.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
}
for {
feature, err := stream.Recv()
if err == io.EOF {
break
}
if err != nil {
grpclog.Fatalf("%v.ListFeatures(_) = _, %v", client, err)
}
grpclog.Println(feature)
}
}
// runRecordRoute sends a sequence of points to server and expects to get a RouteSummary from server.
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))
}
grpclog.Printf("Traversing %d points.", len(points))
stream, err := client.RecordRoute(context.Background())
if err != nil {
grpclog.Fatalf("%v.RecordRoute(_) = _, %v", client, err)
}
for _, point := range points {
if err := stream.Send(point); err != nil {
grpclog.Fatalf("%v.Send(%v) = %v", stream, point, err)
}
}
reply, err := stream.CloseAndRecv()
if err != nil {
grpclog.Fatalf("%v.CloseAndRecv() got error %v, want %v", stream, err, nil)
}
grpclog.Printf("Route summary: %v", reply)
}
// runRouteChat receives a sequence of route notes, while sending notes for various locations.
func runRouteChat(client pb.RouteGuideClient) {
notes := []*pb.RouteNote{
{&pb.Point{Latitude: 0, Longitude: 1}, "First message"},
{&pb.Point{Latitude: 0, Longitude: 2}, "Second message"},
{&pb.Point{Latitude: 0, Longitude: 3}, "Third message"},
{&pb.Point{Latitude: 0, Longitude: 1}, "Fourth message"},
{&pb.Point{Latitude: 0, Longitude: 2}, "Fifth message"},
{&pb.Point{Latitude: 0, Longitude: 3}, "Sixth message"},
}
stream, err := client.RouteChat(context.Background())
if err != nil {
grpclog.Fatalf("%v.RouteChat(_) = _, %v", client, err)
}
waitc := make(chan struct{})
go func() {
for {
in, err := stream.Recv()
if err == io.EOF {
// read done.
close(waitc)
return
}
if err != nil {
grpclog.Fatalf("Failed to receive a note : %v", err)
}
grpclog.Printf("Got message %s at point(%d, %d)", in.Message, in.Location.Latitude, in.Location.Longitude)
}
}()
for _, note := range notes {
if err := stream.Send(note); err != nil {
grpclog.Fatalf("Failed to send a note: %v", err)
}
}
stream.CloseSend()
<-waitc
}
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 {
var sn string
if *serverHostOverride != "" {
sn = *serverHostOverride
}
var creds credentials.TransportCredentials
if *caFile != "" {
var err error
creds, err = credentials.NewClientTLSFromFile(*caFile, sn)
if err != nil {
grpclog.Fatalf("Failed to create TLS credentials %v", err)
}
} else {
creds = credentials.NewClientTLSFromCert(nil, sn)
}
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
conn, err := grpc.Dial(*serverAddr, opts...)
if err != nil {
grpclog.Fatalf("fail to dial: %v", err)
}
defer conn.Close()
client := pb.NewRouteGuideClient(conn)
// Looking for a valid feature
printFeature(client, &pb.Point{Latitude: 409146138, Longitude: -746188906})
// Feature missing.
printFeature(client, &pb.Point{Latitude: 0, Longitude: 0})
// Looking for features between 40, -75 and 42, -73.
printFeatures(client, &pb.Rectangle{
Lo: &pb.Point{Latitude: 400000000, Longitude: -750000000},
Hi: &pb.Point{Latitude: 420000000, Longitude: -730000000},
})
// RecordRoute
runRecordRoute(client)
// RouteChat
runRouteChat(client)
}
route_guide_db.json 在调用的时候是会用到的
tls 如果没有的话默认会使用tcp。
[{
"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"
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