[v3] fix panic on publish methods (#167)

* move publish methods to a separate file
* reorder client methods
* fix panic for publish
* refactoring
* go mod tidy
* rename go.micro => micro
* add comment to README about Set-Cookie headers

README.md

@@ -13,6 +13,7 @@ implements HTTP rules defined in the [google/api/http.proto](https://github.com/
 
 * Streaming is not yet implemented.
 * Only protobuf-generated messages are supported.
+* In `micro/v3`, metadata is implemented as `map[string]string`, which works for most headers but not for multiple `Set-Cookie` headers. The HTTP specification forbids the use of commas in `Set-Cookie` headers; therefore, their values cannot be parsed reliably. In `micro/v4`, metadata uses `map[string][]string`, resolving this issue.
 
 ## Usage
 

client.go

@@ -3,20 +3,17 @@ 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)
@@ -52,6 +49,8 @@ func NewClient(opts ...client.Option) *Client {
 		c.httpClient = defaultHTTPClient(dialer, clientOpts.TLSConfig)
 	}
 
+	c.funcPublish = c.fnPublish
+	c.funcBatchPublish = c.fnBatchPublish
 	c.funcCall = c.fnCall
 	c.funcStream = c.fnStream
 
@@ -73,6 +72,10 @@ func (c *Client) Init(opts ...client.Option) error {
 			c.funcCall = h(c.funcCall)
 		case client.HookStream:
 			c.funcStream = h(c.funcStream)
+		case client.HookPublish:
+			c.funcPublish = h(c.funcPublish)
+		case client.HookBatchPublish:
+			c.funcBatchPublish = h(c.funcBatchPublish)
 		}
 	})
 
@@ -83,6 +86,20 @@ func (c *Client) Options() client.Options {
 	return c.opts
 }
 
+func (c *Client) NewMessage(topic string, msg interface{}, opts ...client.MessageOption) client.Message {
+	msgOpts := client.NewMessageOptions(opts...)
+	if msgOpts.ContentType == "" {
+		msgOpts.ContentType = c.opts.ContentType
+	}
+
+	return &httpMessage{
+		topic:   topic,
+		payload: msg,
+		opts:    msgOpts,
+	}
+
+}
+
 func (c *Client) NewRequest(service, method string, req any, opts ...client.RequestOption) client.Request {
 	reqOpts := client.NewRequestOptions(opts...)
 	if reqOpts.ContentType == "" {
@@ -146,88 +163,14 @@ func (c *Client) Stream(ctx context.Context, req client.Request, opts ...client.
 	return c.funcStream(ctx, req, opts...)
 }
 
-func (c *Client) String() string {
+func (c *Client) Publish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
-	return "http"
+	return c.funcPublish(ctx, p, opts...)
 }
 
 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 {
+func (c *Client) String() string {
-	return c.publish(ctx, ps, opts...)
+	return "http"
-}
-
-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...)
 }

client_publish.go

@@ -0,0 +1,84 @@
+package http
+
+import (
+	"context"
+	"os"
+
+	"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"
+)
+
+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) fnPublish(ctx context.Context, p client.Message, opts ...client.PublishOption) error {
+	return c.publish(ctx, []client.Message{p}, opts...)
+}
+
+func (c *Client) fnBatchPublish(ctx context.Context, ps []client.Message, opts ...client.PublishOption) error {
+	return c.publish(ctx, ps, opts...)
+}

go.mod

@@ -7,7 +7,7 @@ toolchain go1.24.3
 require (
 	github.com/stretchr/testify v1.11.1
 	go.unistack.org/micro-codec-json/v3 v3.10.3
-	go.unistack.org/micro/v3 v3.11.45
+	go.unistack.org/micro/v3 v3.11.48
 	google.golang.org/protobuf v1.36.10
 )
 

go.sum

@@ -29,8 +29,8 @@ go.unistack.org/micro-codec-json/v3 v3.10.3 h1:FwSBfJswov30Dyqxp1XfQW1EG4h77uTEe
 go.unistack.org/micro-codec-json/v3 v3.10.3/go.mod h1:26OK5MizMNKhspGC6PRVwpDIp5w1GmRb0nE5eRWWDxA=
 go.unistack.org/micro-proto/v3 v3.4.1 h1:UTjLSRz2YZuaHk9iSlVqqsA50JQNAEK2ZFboGqtEa9Q=
 go.unistack.org/micro-proto/v3 v3.4.1/go.mod h1:okx/cnOhzuCX0ggl/vToatbCupi0O44diiiLLsZ93Zo=
-go.unistack.org/micro/v3 v3.11.45 h1:fjTLZYWgsVf9FIMZBxOg8ios2/tmyimnjZrsrxEUeXU=
+go.unistack.org/micro/v3 v3.11.48 h1:lHJYSHU2z1TTcuswItGwG7cZXN6n04EFqY7lk/0gA7w=
-go.unistack.org/micro/v3 v3.11.45/go.mod h1:fDQ8Mu9wubaFP0L8hNQlpzHiEnWN0wbOlawN9HYo0N4=
+go.unistack.org/micro/v3 v3.11.48/go.mod h1:fDQ8Mu9wubaFP0L8hNQlpzHiEnWN0wbOlawN9HYo0N4=
 golang.org/x/net v0.41.0 h1:vBTly1HeNPEn3wtREYfy4GZ/NECgw2Cnl+nK6Nz3uvw=
 golang.org/x/net v0.41.0/go.mod h1:B/K4NNqkfmg07DQYrbwvSluqCJOOXwUjeb/5lOisjbA=
 golang.org/x/sys v0.36.0 h1:KVRy2GtZBrk1cBYA7MKu5bEZFxQk4NIDV6RLVcC8o0k=

message.go

@@ -5,40 +5,24 @@ import (
 	"go.unistack.org/micro/v3/metadata"
 )
 
-type httpEvent struct {
+type httpMessage struct {
-	payload     interface{}
+	topic   string
-	topic       string
+	payload interface{}
-	contentType string
+	opts    client.MessageOptions
-	opts        client.MessageOptions
 }
 
-func newHTTPEvent(topic string, payload interface{}, contentType string, opts ...client.MessageOption) client.Message {
+func (m *httpMessage) Topic() string {
-	options := client.NewMessageOptions(opts...)
+	return m.topic
-
-	if len(options.ContentType) > 0 {
-		contentType = options.ContentType
-	}
-
-	return &httpEvent{
-		payload:     payload,
-		topic:       topic,
-		contentType: contentType,
-		opts:        options,
-	}
 }
 
-func (c *httpEvent) ContentType() string {
+func (m *httpMessage) Payload() interface{} {
-	return c.contentType
+	return m.payload
 }
 
-func (c *httpEvent) Topic() string {
+func (m *httpMessage) ContentType() string {
-	return c.topic
+	return m.opts.ContentType
 }
 
-func (c *httpEvent) Payload() interface{} {
+func (m *httpMessage) Metadata() metadata.Metadata {
-	return c.payload
+	return m.opts.Metadata
-}
-
-func (c *httpEvent) Metadata() metadata.Metadata {
-	return c.opts.Metadata
 }