micro/client/noop.go

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package client
import (
"context"
"github.com/unistack-org/micro/v3/broker"
"github.com/unistack-org/micro/v3/codec"
"github.com/unistack-org/micro/v3/errors"
"github.com/unistack-org/micro/v3/metadata"
)
var (
// DefaultCodecs will be used to encode/decode data
DefaultCodecs = map[string]codec.Codec{
//"application/json": cjson.NewCodec,
//"application/json-rpc": cjsonrpc.NewCodec,
//"application/protobuf": cproto.NewCodec,
//"application/proto-rpc": cprotorpc.NewCodec,
"application/octet-stream": codec.NewCodec(),
}
)
const (
defaultContentType = "application/json"
)
type noopClient struct {
opts Options
}
type noopMessage struct {
topic string
payload interface{}
opts MessageOptions
}
type noopRequest struct {
service string
method string
endpoint string
contentType string
body interface{}
codec codec.Codec
stream bool
}
// NewClient returns new noop client
func NewClient(opts ...Option) Client {
return &noopClient{opts: NewOptions(opts...)}
}
func (n *noopRequest) Service() string {
return n.service
}
func (n *noopRequest) Method() string {
return n.method
}
func (n *noopRequest) Endpoint() string {
return n.endpoint
}
func (n *noopRequest) ContentType() string {
return n.contentType
}
func (n *noopRequest) Body() interface{} {
return n.body
}
func (n *noopRequest) Codec() codec.Codec {
return n.codec
}
func (n *noopRequest) Stream() bool {
return n.stream
}
type noopResponse struct {
codec codec.Codec
header metadata.Metadata
}
func (n *noopResponse) Codec() codec.Codec {
return n.codec
}
func (n *noopResponse) Header() metadata.Metadata {
return n.header
}
func (n *noopResponse) Read() ([]byte, error) {
return nil, nil
}
type noopStream struct{}
func (n *noopStream) Context() context.Context {
return context.Background()
}
func (n *noopStream) Request() Request {
return &noopRequest{}
}
func (n *noopStream) Response() Response {
return &noopResponse{}
}
func (n *noopStream) Send(interface{}) error {
return nil
}
func (n *noopStream) Recv(interface{}) error {
return nil
}
func (n *noopStream) Error() error {
return nil
}
func (n *noopStream) Close() error {
return nil
}
func (n *noopMessage) Topic() string {
return n.topic
}
func (n *noopMessage) Payload() interface{} {
return n.payload
}
func (n *noopMessage) ContentType() string {
return n.opts.ContentType
}
func (n *noopClient) newCodec(contentType string) (codec.Codec, error) {
if cf, ok := n.opts.Codecs[contentType]; ok {
return cf, nil
}
if cf, ok := DefaultCodecs[contentType]; ok {
return cf, nil
}
return nil, codec.ErrUnknownContentType
}
func (n *noopClient) Init(opts ...Option) error {
for _, o := range opts {
o(&n.opts)
}
return nil
}
func (n *noopClient) Options() Options {
return n.opts
}
func (n *noopClient) String() string {
return "noop"
}
func (n *noopClient) Call(ctx context.Context, req Request, rsp interface{}, opts ...CallOption) error {
return nil
}
func (n *noopClient) NewRequest(service, endpoint string, req interface{}, opts ...RequestOption) Request {
return &noopRequest{}
}
func (n *noopClient) NewMessage(topic string, msg interface{}, opts ...MessageOption) Message {
options := NewMessageOptions(opts...)
return &noopMessage{topic: topic, payload: msg, opts: options}
}
func (n *noopClient) Stream(ctx context.Context, req Request, opts ...CallOption) (Stream, error) {
return &noopStream{}, nil
}
func (n *noopClient) Publish(ctx context.Context, p Message, opts ...PublishOption) error {
var body []byte
options := NewPublishOptions(opts...)
md, ok := metadata.FromContext(ctx)
if !ok {
md = metadata.New(0)
}
md["Content-Type"] = p.ContentType()
md["Micro-Topic"] = p.Topic()
// passed in raw data
if d, ok := p.Payload().(*codec.Frame); ok {
body = d.Data
} else {
// use codec for payload
cf, err := n.newCodec(p.ContentType())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
// set the body
b, err := cf.Marshal(p.Payload())
if err != nil {
return errors.InternalServerError("go.micro.client", err.Error())
}
body = b
}
topic := p.Topic()
// get the exchange
if len(options.Exchange) > 0 {
topic = options.Exchange
}
return n.opts.Broker.Publish(ctx, topic, &broker.Message{
Header: md,
Body: body,
}, broker.PublishContext(options.Context))
}