Golang Request.Service方法代碼示例

func (w *wrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	if !w.whitelist[req.Service()] {
		return errors.Forbidden("go.micro.rpc", "forbidden")
	}

	return w.Client.Call(ctx, req, rsp, opts...)
}

func (m *MockClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	m.Lock()
	defer m.Unlock()

	response, ok := m.Response[req.Service()]
	if !ok {
		return errors.NotFound("go.micro.client.mock", "service not found")
	}

	for _, r := range response {
		if r.Method != req.Method() {
			continue
		}

		if r.Error != nil {
			return r.Error
		}

		v := reflect.ValueOf(rsp)

		if t := reflect.TypeOf(rsp); t.Kind() == reflect.Ptr {
			v = reflect.Indirect(v)
		}

		v.Set(reflect.ValueOf(r.Response))

		return nil
	}

	return fmt.Errorf("rpc: can't find service %s", req.Method())
}

func (x *xrayWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	var err error
	s := getSegment(x.opts.Name, ctx)

	defer func() {
		setCallStatus(s, req.Service(), req.Method(), err)
		go record(x.x, s)
	}()

	ctx = newContext(ctx, s)
	err = x.Client.Call(ctx, req, rsp, opts...)
	return err
}

func (g *grpcClient) stream(ctx context.Context, address string, req client.Request, opts client.CallOptions) (client.Streamer, error) {
	header := make(map[string]string)
	if md, ok := metadata.FromContext(ctx); ok {
		for k, v := range md {
			header[k] = v
		}
	}

	// set timeout in nanoseconds
	header["timeout"] = fmt.Sprintf("%d", opts.RequestTimeout)
	// set the content type for the request
	header["x-content-type"] = req.ContentType()

	md := gmetadata.New(header)
	ctx = gmetadata.NewContext(ctx, md)

	cf, err := g.newGRPCCodec(req.ContentType())
	if err != nil {
		return nil, errors.InternalServerError("go.micro.client", err.Error())
	}

	// TODO: do not use insecure
	cc, err := grpc.Dial(address, grpc.WithCodec(cf), grpc.WithTimeout(opts.DialTimeout), grpc.WithInsecure())
	if err != nil {
		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
	}

	desc := &grpc.StreamDesc{
		StreamName:    req.Service() + req.Method(),
		ClientStreams: true,
		ServerStreams: true,
	}

	st, err := grpc.NewClientStream(ctx, desc, cc, req.Method())
	if err != nil {
		return nil, errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
	}

	return &grpcStream{
		context: ctx,
		request: req,
		closed:  make(chan bool),
		stream:  st,
		conn:    cc,
	}, nil
}

func (o *otWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	md, _ := metadata.FromContext(ctx)
	name := fmt.Sprintf("%s.%s", req.Service(), req.Method())
	var sp opentracing.Span
	wireContext, err := o.ot.Extract(opentracing.TextMap, opentracing.TextMapCarrier(md))
	if err != nil {
		sp = o.ot.StartSpan(name)
	} else {
		sp = o.ot.StartSpan(name, opentracing.ChildOf(wireContext))
	}
	defer sp.Finish()
	if err := sp.Tracer().Inject(sp.Context(), opentracing.TextMap, opentracing.TextMapCarrier(md)); err != nil {
		return err
	}
	ctx = metadata.NewContext(ctx, md)
	return o.Client.Call(ctx, req, rsp, opts...)
}

func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	var span *Span
	var ok, okk bool
	var err error
	md := metadata.Metadata{}

	// try pull span from context
	span, ok = c.t.FromContext(ctx)
	if !ok {
		// couldn't do that, try from the metadata

		// So get trace info from metadata
		var kk bool
		md, kk = metadata.FromContext(ctx)
		if !kk {
			// couldn't do that either

			// so this is a new span!
			md = metadata.Metadata{}
			span = c.t.NewSpan(nil)
		} else {
			// ok we got some md

			// can we get the span from the header?
			span, okk = c.t.FromHeader(md)
			if !okk {
				// no, ok create one!
				span = c.t.NewSpan(nil)
			}
		}
	}

	// got parent span from context or metadata
	if okk || ok {
		// setup the span with parent
		span = c.t.NewSpan(&Span{
			// same trace id
			TraceId: span.TraceId,
			// set parent id to parent span id
			ParentId: span.Id,
			// use previous debug
			Debug: span.Debug,
		})
	}

	// start the span
	span.Annotations = append(span.Annotations, &Annotation{
		Timestamp: time.Now(),
		Type:      AnnStart,
		Service:   c.s,
	})

	// and mark as debug? might want to do this based on a setting
	span.Debug = true
	// set uniq span name
	span.Name = req.Service() + "." + req.Method()
	// set source/dest
	span.Source = c.s
	span.Destination = &registry.Service{Name: req.Service()}

	// set context key
	newCtx := c.t.NewContext(ctx, span)
	// set metadata
	newCtx = metadata.NewContext(newCtx, c.t.NewHeader(md, span))

	// mark client request
	span.Annotations = append(span.Annotations, &Annotation{
		Timestamp: time.Now(),
		Type:      AnnClientRequest,
		Service:   c.s,
	})

	// defer the completion of the span
	defer func() {
		// mark client response
		span.Annotations = append(span.Annotations, &Annotation{
			Timestamp: time.Now(),
			Type:      AnnClientResponse,
			Service:   c.s,
		})

		// if we were the creator
		var debug map[string]string
		if err != nil {
			debug = map[string]string{"error": err.Error()}
		}
		// mark end of span
		span.Annotations = append(span.Annotations, &Annotation{
			Timestamp: time.Now(),
			Type:      AnnEnd,
			Service:   c.s,
			Debug:     debug,
		})

		span.Duration = time.Now().Sub(span.Timestamp)

		// flush the span to the collector on return
		c.t.Collect(span)
	}()

//.........這裏部分代碼省略.........

func (g *grpcClient) Stream(ctx context.Context, req client.Request, opts ...client.CallOption) (client.Streamer, error) {
	// make a copy of call opts
	callOpts := g.opts.CallOptions
	for _, opt := range opts {
		opt(&callOpts)
	}

	// get next nodes from the selector
	next, err := g.opts.Selector.Select(req.Service(), callOpts.SelectOptions...)
	if err != nil && err == selector.ErrNotFound {
		return nil, errors.NotFound("go.micro.client", err.Error())
	} else if err != nil {
		return nil, errors.InternalServerError("go.micro.client", err.Error())
	}

	// check if we already have a deadline
	d, ok := ctx.Deadline()
	if !ok {
		// no deadline so we create a new one
		ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
	} else {
		// got a deadline so no need to setup context
		// but we need to set the timeout we pass along
		opt := client.WithRequestTimeout(d.Sub(time.Now()))
		opt(&callOpts)
	}

	// should we noop right here?
	select {
	case <-ctx.Done():
		return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
	default:
	}

	call := func(i int) (client.Streamer, error) {
		// call backoff first. Someone may want an initial start delay
		t, err := callOpts.Backoff(ctx, req, i)
		if err != nil {
			return nil, errors.InternalServerError("go.micro.client", err.Error())
		}

		// only sleep if greater than 0
		if t.Seconds() > 0 {
			time.Sleep(t)
		}

		node, err := next()
		if err != nil && err == selector.ErrNotFound {
			return nil, errors.NotFound("go.micro.client", err.Error())
		} else if err != nil {
			return nil, errors.InternalServerError("go.micro.client", err.Error())
		}

		addr := node.Address
		if node.Port > 0 {
			addr = fmt.Sprintf("%s:%d", addr, node.Port)
		}

		stream, err := g.stream(ctx, addr, req, callOpts)
		g.opts.Selector.Mark(req.Service(), node, err)
		return stream, err
	}

	type response struct {
		stream client.Streamer
		err    error
	}

	ch := make(chan response, callOpts.Retries)
	var grr error

	for i := 0; i < callOpts.Retries; i++ {
		go func() {
			s, err := call(i)
			ch <- response{s, err}
		}()

		select {
		case <-ctx.Done():
			return nil, errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
		case rsp := <-ch:
			// if the call succeeded lets bail early
			if rsp.err == nil {
				return rsp.stream, nil
			}

			retry, rerr := callOpts.Retry(ctx, req, i, err)
			if rerr != nil {
				return nil, rerr
			}

			if !retry {
				return nil, rsp.err
			}

			grr = rsp.err
		}
	}

	return nil, grr
//.........這裏部分代碼省略.........

func (g *grpcClient) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	// make a copy of call opts
	callOpts := g.opts.CallOptions
	for _, opt := range opts {
		opt(&callOpts)
	}

	// get next nodes from the selector
	next, err := g.opts.Selector.Select(req.Service(), callOpts.SelectOptions...)
	if err != nil && err == selector.ErrNotFound {
		return errors.NotFound("go.micro.client", err.Error())
	} else if err != nil {
		return errors.InternalServerError("go.micro.client", err.Error())
	}

	// check if we already have a deadline
	d, ok := ctx.Deadline()
	if !ok {
		// no deadline so we create a new one
		ctx, _ = context.WithTimeout(ctx, callOpts.RequestTimeout)
	} else {
		// got a deadline so no need to setup context
		// but we need to set the timeout we pass along
		opt := client.WithRequestTimeout(d.Sub(time.Now()))
		opt(&callOpts)
	}

	// should we noop right here?
	select {
	case <-ctx.Done():
		return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
	default:
	}

	// make copy of call method
	gcall := g.call

	// wrap the call in reverse
	for i := len(callOpts.CallWrappers); i > 0; i-- {
		gcall = callOpts.CallWrappers[i-1](gcall)
	}

	// return errors.New("go.micro.client", "request timeout", 408)
	call := func(i int) error {
		// call backoff first. Someone may want an initial start delay
		t, err := callOpts.Backoff(ctx, req, i)
		if err != nil {
			return errors.InternalServerError("go.micro.client", err.Error())
		}

		// only sleep if greater than 0
		if t.Seconds() > 0 {
			time.Sleep(t)
		}

		// select next node
		node, err := next()
		if err != nil && err == selector.ErrNotFound {
			return errors.NotFound("go.micro.client", err.Error())
		} else if err != nil {
			return errors.InternalServerError("go.micro.client", err.Error())
		}

		// set the address
		addr := node.Address
		if node.Port > 0 {
			addr = fmt.Sprintf("%s:%d", addr, node.Port)
		}

		// make the call
		err = gcall(ctx, addr, req, rsp, callOpts)
		g.opts.Selector.Mark(req.Service(), node, err)
		return err
	}

	ch := make(chan error, callOpts.Retries)
	var gerr error

	for i := 0; i < callOpts.Retries; i++ {
		go func() {
			ch <- call(i)
		}()

		select {
		case <-ctx.Done():
			return errors.New("go.micro.client", fmt.Sprintf("%v", ctx.Err()), 408)
		case err := <-ch:
			// if the call succeeded lets bail early
			if err == nil {
				return nil
			}

			retry, rerr := callOpts.Retry(ctx, req, i, err)
			if rerr != nil {
				return rerr
			}

			if !retry {
				return err
			}
//.........這裏部分代碼省略.........

func (c *clientWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	return hystrix.Do(req.Service()+"."+req.Method(), func() error {
		return c.Client.Call(ctx, req, rsp, opts...)
	}, nil)
}

func (l *logWrapper) Call(ctx context.Context, req client.Request, rsp interface{}, opts ...client.CallOption) error {
	md, _ := c.GetMetadata(ctx)
	fmt.Printf("[Log Wrapper] ctx: %v service: %s method: %s\n", md, req.Service(), req.Method())
	return l.Client.Call(ctx, req, rsp)
}