add compile-time interface compliance check

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

client.go

@@ -3,27 +3,34 @@ package http
 import (
 	"context"
 	"net/http"
+	"os"
 	"strconv"
 	"sync"
 	"time"
 
+	"go.unistack.org/micro-client-http/v3/status"
+	"go.unistack.org/micro/v3/broker"
 	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v3/codec"
 	"go.unistack.org/micro/v3/errors"
+	"go.unistack.org/micro/v3/metadata"
 	"go.unistack.org/micro/v3/options"
 	"go.unistack.org/micro/v3/semconv"
 	"go.unistack.org/micro/v3/tracer"
-
-	"go.unistack.org/micro-client-http/v3/status"
 )
 
+var _ client.Client = (*Client)(nil)
+
 var DefaultContentType = "application/json"
 
 type Client struct {
-	funcCall   client.FuncCall
-	funcStream client.FuncStream
-	httpClient *http.Client
-	opts       client.Options
-	mu         sync.RWMutex
+	funcPublish      client.FuncPublish
+	funcBatchPublish client.FuncBatchPublish
+	funcCall         client.FuncCall
+	funcStream       client.FuncStream
+	httpClient       *http.Client
+	opts             client.Options
+	mu               sync.RWMutex
 }
 
 func NewClient(opts ...client.Option) *Client {
@@ -142,3 +149,85 @@ func (c *Client) Stream(ctx context.Context, req client.Request, opts ...client.
 func (c *Client) String() string {
 	return "http"
 }
+
+func (c *Client) BatchPublish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	return c.funcBatchPublish(ctx, ps, opts...)
+}
+
+func (c *Client) fnBatchPublish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	return c.publish(ctx, ps, opts...)
+}
+
+func (c *Client) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
+	return c.funcPublish(ctx, p, opts...)
+}
+
+func (c *Client) fnPublish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
+	return c.publish(ctx, []client.Message{p}, opts...)
+}
+
+func (c *Client) publish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	var body []byte
+
+	options := client.NewPublishOptions(opts...)
+
+	// get proxy
+	exchange := ""
+	if v, ok := os.LookupEnv("MICRO_PROXY"); ok {
+		exchange = v
+	}
+	// get the exchange
+	if len(options.Exchange) > 0 {
+		exchange = options.Exchange
+	}
+
+	msgs := make([]*broker.Message, 0, len(ps))
+
+	omd, ok := metadata.FromOutgoingContext(ctx)
+	if !ok {
+		omd = metadata.New(2)
+	}
+
+	for _, p := range ps {
+		md := metadata.Copy(omd)
+		topic := p.Topic()
+		if len(exchange) > 0 {
+			topic = exchange
+		}
+		md.Set(metadata.HeaderTopic, topic)
+		iter := p.Metadata().Iterator()
+		var k, v string
+		for iter.Next(&k, &v) {
+			md.Set(k, v)
+		}
+
+		md[metadata.HeaderContentType] = p.ContentType()
+
+		// passed in raw data
+		if d, ok := p.Payload().(*codec.Frame); ok {
+			body = d.Data
+		} else {
+			// use codec for payload
+			cf, err := c.newCodec(p.ContentType())
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%+v", err)
+			}
+			// set the body
+			b, err := cf.Marshal(p.Payload())
+			if err != nil {
+				return errors.InternalServerError("go.micro.client", "%+v", err)
+			}
+			body = b
+		}
+		msgs = append(msgs, &broker.Message{Header: md, Body: body})
+	}
+
+	return c.opts.Broker.BatchPublish(ctx, msgs,
+		broker.PublishContext(options.Context),
+		broker.PublishBodyOnly(options.BodyOnly),
+	)
+}
+
+func (c *Client) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
+	return newHTTPEvent(topic, msg, c.opts.ContentType, opts...)
+}

message.go

@@ -0,0 +1,44 @@
+package http
+
+import (
+	"go.unistack.org/micro/v3/client"
+	"go.unistack.org/micro/v3/metadata"
+)
+
+type httpEvent struct {
+	payload     interface{}
+	topic       string
+	contentType string
+	opts        client.MessageOptions
+}
+
+func newHTTPEvent(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
+	options := client.NewMessageOptions(opts...)
+
+	if len(options.ContentType) > 0 {
+		contentType = options.ContentType
+	}
+
+	return &httpEvent{
+		payload:     payload,
+		topic:       topic,
+		contentType: contentType,
+		opts:        options,
+	}
+}
+
+func (c *httpEvent) ContentType() string {
+	return c.contentType
+}
+
+func (c *httpEvent) Topic() string {
+	return c.topic
+}
+
+func (c *httpEvent) Payload() interface{} {
+	return c.payload
+}
+
+func (c *httpEvent) Metadata() metadata.Metadata {
+	return c.opts.Metadata
+}