go/examples/echo/echo_zap.go

// Code generated by zapgen; DO NOT EDIT.
// source: echo.zap

package echo

import (
	"fmt"
	"github.com/zap-proto/go/rpc"
)

// Method ordinals for the Echo service (stable 1-based wire ids).
const (
	EchoPingOrdinal     uint32 = 1
	EchoNotifyOrdinal   uint32 = 2
	EchoHealthOrdinal   uint32 = 3
	EchoShutdownOrdinal uint32 = 4
)

// EchoChannel ships one Call envelope and awaits its correlated Response.
type EchoChannel interface {
	Call(envelope []byte) (rpc.Response, error)
}

// EchoClient is a typed RPC client for the Echo service over a ZAP call channel.
// Each call takes a fresh PromiseID from sess; the pipelined "On" form of a
// method sets Target to a prior call's Promise so the server chains them.
type EchoClient struct {
	ch   EchoChannel
	cap  []byte
	sess *rpc.Session
}

// NewEchoClient returns a client that issues calls over ch, attaching cap
// (which may be nil) to every request.
func NewEchoClient(ch EchoChannel, capability []byte) *EchoClient {
	return &EchoClient{ch: ch, cap: capability, sess: rpc.NewSession()}
}

func (c *EchoClient) Ping(req []byte) (rpc.Promise, []byte, error) {
	return c.invokePing(rpc.NoTarget, req)
}

// PingOn issues Ping as a dependent call pipelined on the answer of on:
// the server substitutes on's resolved result for this call's payload
// before dispatch, so it ships without waiting for on to round-trip.
func (c *EchoClient) PingOn(on rpc.Promise) (rpc.Promise, []byte, error) {
	return c.invokePing(on.ID, nil)
}

func (c *EchoClient) invokePing(target uint32, payload []byte) (rpc.Promise, []byte, error) {
	p := c.sess.Next()
	resp, err := c.ch.Call(rpc.BuildRequest(rpc.Call{
		Method:    EchoPingOrdinal,
		PromiseID: p.ID,
		Target:    target,
		Cap:       c.cap,
		Payload:   payload,
	}))
	if err != nil {
		return p, nil, err
	}
	if resp.Status != rpc.StatusOK {
		return p, nil, fmt.Errorf("Echo.Ping: status %d", resp.Status)
	}
	return p, resp.Body, nil
}

func (c *EchoClient) Notify(req []byte) (rpc.Promise, error) {
	return c.invokeNotify(rpc.NoTarget, req)
}

// NotifyOn issues Notify as a dependent call pipelined on the answer of on:
// the server substitutes on's resolved result for this call's payload
// before dispatch, so it ships without waiting for on to round-trip.
func (c *EchoClient) NotifyOn(on rpc.Promise) (rpc.Promise, error) {
	return c.invokeNotify(on.ID, nil)
}

func (c *EchoClient) invokeNotify(target uint32, payload []byte) (rpc.Promise, error) {
	p := c.sess.Next()
	resp, err := c.ch.Call(rpc.BuildRequest(rpc.Call{
		Method:    EchoNotifyOrdinal,
		PromiseID: p.ID,
		Target:    target,
		Cap:       c.cap,
		Payload:   payload,
	}))
	if err != nil {
		return p, err
	}
	if resp.Status != rpc.StatusOK {
		return p, fmt.Errorf("Echo.Notify: status %d", resp.Status)
	}
	return p, nil
}

func (c *EchoClient) Health() (rpc.Promise, []byte, error) {
	return c.invokeHealth(rpc.NoTarget, nil)
}

// HealthOn issues Health as a dependent call pipelined on the answer of on:
// the server substitutes on's resolved result for this call's payload
// before dispatch, so it ships without waiting for on to round-trip.
func (c *EchoClient) HealthOn(on rpc.Promise) (rpc.Promise, []byte, error) {
	return c.invokeHealth(on.ID, nil)
}

func (c *EchoClient) invokeHealth(target uint32, payload []byte) (rpc.Promise, []byte, error) {
	p := c.sess.Next()
	resp, err := c.ch.Call(rpc.BuildRequest(rpc.Call{
		Method:    EchoHealthOrdinal,
		PromiseID: p.ID,
		Target:    target,
		Cap:       c.cap,
		Payload:   payload,
	}))
	if err != nil {
		return p, nil, err
	}
	if resp.Status != rpc.StatusOK {
		return p, nil, fmt.Errorf("Echo.Health: status %d", resp.Status)
	}
	return p, resp.Body, nil
}

func (c *EchoClient) Shutdown() (rpc.Promise, error) {
	return c.invokeShutdown(rpc.NoTarget, nil)
}

// ShutdownOn issues Shutdown as a dependent call pipelined on the answer of on:
// the server substitutes on's resolved result for this call's payload
// before dispatch, so it ships without waiting for on to round-trip.
func (c *EchoClient) ShutdownOn(on rpc.Promise) (rpc.Promise, error) {
	return c.invokeShutdown(on.ID, nil)
}

func (c *EchoClient) invokeShutdown(target uint32, payload []byte) (rpc.Promise, error) {
	p := c.sess.Next()
	resp, err := c.ch.Call(rpc.BuildRequest(rpc.Call{
		Method:    EchoShutdownOrdinal,
		PromiseID: p.ID,
		Target:    target,
		Cap:       c.cap,
		Payload:   payload,
	}))
	if err != nil {
		return p, err
	}
	if resp.Status != rpc.StatusOK {
		return p, fmt.Errorf("Echo.Shutdown: status %d", resp.Status)
	}
	return p, nil
}

// EchoHandler is the server contract for the Echo service. Implement each
// method, then route requests to it with DispatchEcho.
type EchoHandler interface {
	Ping(req []byte) ([]byte, error)
	Notify(req []byte) error
	Health() ([]byte, error)
	Shutdown() error
}

// DispatchEcho decodes a Call envelope, routes it by method ordinal to h,
// and returns the response envelope. An unknown ordinal yields a
// StatusNotFound response; a handler error yields StatusInternal.
func DispatchEcho(h EchoHandler, envelope []byte) ([]byte, error) {
	call, err := rpc.ParseRequest(envelope)
	if err != nil {
		return nil, err
	}
	switch call.Method {
	case EchoPingOrdinal:
		body, err := h.Ping(call.Payload)
		if err != nil {
			return rpc.BuildResponse(rpc.StatusInternal, call.PromiseID, nil), nil
		}
		return rpc.BuildResponse(rpc.StatusOK, call.PromiseID, body), nil
	case EchoNotifyOrdinal:
		if err := h.Notify(call.Payload); err != nil {
			return rpc.BuildResponse(rpc.StatusInternal, call.PromiseID, nil), nil
		}
		return rpc.BuildResponse(rpc.StatusOK, call.PromiseID, nil), nil
	case EchoHealthOrdinal:
		body, err := h.Health()
		if err != nil {
			return rpc.BuildResponse(rpc.StatusInternal, call.PromiseID, nil), nil
		}
		return rpc.BuildResponse(rpc.StatusOK, call.PromiseID, body), nil
	case EchoShutdownOrdinal:
		if err := h.Shutdown(); err != nil {
			return rpc.BuildResponse(rpc.StatusInternal, call.PromiseID, nil), nil
		}
		return rpc.BuildResponse(rpc.StatusOK, call.PromiseID, nil), nil
	default:
		return rpc.BuildResponse(rpc.StatusNotFound, call.PromiseID, nil), nil
	}
}