grpc 深入

生命周期

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)

普通rpc: 客户端发送请求，通知服务端调用rpc服务，服务端返回请求，如果状态"ok"，则客户机将获得响应，从而在客户端完成该呼叫。

服务端流rpc: 服务器在获取客户端的请求消息之后发送回响应流。在发回所有响应后，服务器端的状态信息（状态码和可选状态消息）和可选的尾随元数据将被发送回完成。客户端完成所有服务器响应后即可完成。

客户端流rpc: 客户端将请求流发送到服务器，而不是单个请求。服务器发回单个响应，通常但不一定在收到所有客户端的请求后将其其状态详细信息和可选元数据返回。

双向流rpc: 发生的事情取决于应用程序，因为客户端和服务器可以以任何顺序读取和写入, 流完全独立运行。

截止/超时时间(Deadlines/Timeouts)

gprc 设置超时时间：

客户端指定调用rpc的超时时间，超时返回错误 "DEADLINE_EXCEEDED"

在服务器端，服务器可以查询特定的RPC是否超时，还是剩下多少时间来完成RPC。

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不会回滚操作

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。

身份验证

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。

SSL/TLS：gRPC具有SSL/TLS集成，并促进使用SSL/TLS对服务器进行身份验证，并对客户端和服务器之间交换的所有数据进行加密。

Token (google): 通过gRPC访问Google API时获得token（通常是OAuth2 tokens）的额外支持是为某些验证流提供的：一般情况下，此机制必须使用SSL/TLS，Google不会允许没有SSL/TLS的连接，大多数gRPC语言实现不会让您在未加密的频道上发送凭据。

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。

凭证

通道凭据，附加到通道，如SSL凭据。

调用凭据，它们附加到调用（或C ++中的ClientContext）中。

route_guide

这个例子演示了客户端和服务端的集中通讯方式

普通rpc: 客户端向服务端发起请求，并等待响应回来，就像普通的函数调用一样。

服务器端流式RPC: 客户端向服务器发送请求并获取流来读取一系列消息。客户端从返回的流中读取，直到没有更多的消息。

客户端流RPC：客户端使用流写入一系列消息并将其发送到服务器。一旦客户端完成了消息的写入，它等待服务器读取所有消息并返回其响应。

双向流RPC：其中双方使用读写流发送消息序列。两个流独立运行，所以客户端和服务器可以按照他们喜欢的顺序进行读取和写入：例如，服务器可能在写入响应之前等待接收所有客户端消息，或者可以交替地读取消息然后写入消息，或读取和写入的其他组合。每个流中的消息顺序被保留。

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) {}}

pb文件

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:.

server 实现

// 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 mainimport (	"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)}

客户端实现

// 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 mainimport (	"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)}

testdata

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。

route_guide_db.json 数据

[{    "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": {        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