feat add after filter support on sendMsg

internal/rpc/msg/context.go

@@ -4,14 +4,19 @@ import (
 	pbChat "Open_IM/pkg/proto/chat"
 	"context"
 	"net/http"
+	"time"
 )
 
+var _ context.Context = (*SendContext)(nil)
+
 // SendContext is the most important part of RPC SendMsg. It allows us to pass variables between middleware
 type SendContext struct {
 	ctx context.Context
 	rpc *rpcChat
 	// beforeFilters are filters which will be triggered before send msg
 	beforeFilters []BeforeSendFilter
+	// afterSenders are filters which will be triggered after send msg
+	afterSenders []AfterSendFilter
 }
 
 func NewSendContext(ctx context.Context, rpc *rpcChat) *SendContext {
@@ -19,22 +24,10 @@ func NewSendContext(ctx context.Context, rpc *rpcChat) *SendContext {
 		ctx:           ctx,
 		rpc:           rpc,
 		beforeFilters: rpc.beforeSenders,
+		afterSenders:  rpc.afterSenders,
 	}
 }
 
-func (c *SendContext) SetCtx(ctx context.Context) {
-	c.ctx = ctx
-}
-
-func (c *SendContext) Value(key interface{}) interface{} {
-	return c.ctx.Value(key)
-}
-
-func (c *SendContext) WithValue(key, val interface{}) {
-	ctx := context.WithValue(c.ctx, key, val)
-	c.SetCtx(ctx)
-}
-
 // doBeforeFilters executes the pending filters in the chain inside the calling handler.
 func (c *SendContext) doBeforeFilters(pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, bool, error) {
 	for _, handler := range c.beforeFilters {
@@ -50,6 +43,21 @@ func (c *SendContext) doBeforeFilters(pb *pbChat.SendMsgReq) (*pbChat.SendMsgRes
 	return nil, true, nil
 }
 
+// doAfterFilters executes the pending filters in the chain inside the calling handler.
+func (c *SendContext) doAfterFilters(req *pbChat.SendMsgReq, res *pbChat.SendMsgResp) (*pbChat.SendMsgResp, bool, error) {
+	for _, handler := range c.afterSenders {
+		res, ok, err := handler(c, req, res)
+		if err != nil {
+			return nil, false, err
+		}
+		if !ok {
+			return res, ok, nil
+		}
+	}
+
+	return nil, true, nil
+}
+
 func (c *SendContext) SendMsg(pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, error) {
 	replay := pbChat.SendMsgResp{}
 	res, ok, err := c.doBeforeFilters(pb)
@@ -67,5 +75,54 @@ func (c *SendContext) SendMsg(pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, error
 		return res, err
 	}
 
-	return nil, nil
+	res, ok, err = c.doAfterFilters(pb, res)
+	if err != nil {
+		return returnMsg(&replay, pb, http.StatusInternalServerError, http.StatusText(http.StatusInternalServerError), err.Error(), 0)
+	}
+	if !ok {
+		return res, nil
+	}
+
+	return res, nil
+}
+
+func (c *SendContext) SetCtx(ctx context.Context) {
+	c.ctx = ctx
+}
+
+func (c *SendContext) WithValue(key, val interface{}) {
+	ctx := context.WithValue(c.ctx, key, val)
+	c.SetCtx(ctx)
+}
+
+/************************************/
+/***** context *****/
+/************************************/
+
+// Deadline returns that there is no deadline (ok==false) when c has no Context.
+func (c *SendContext) Deadline() (deadline time.Time, ok bool) {
+	if c.ctx == nil {
+		return
+	}
+	return c.ctx.Deadline()
+}
+
+// Done returns nil (chan which will wait forever) when c has no Context.
+func (c *SendContext) Done() <-chan struct{} {
+	if c.ctx == nil {
+		return nil
+	}
+	return c.ctx.Done()
+}
+
+// Err returns nil when c has no Context.
+func (c *SendContext) Err() error {
+	if c.ctx == nil {
+		return nil
+	}
+	return c.ctx.Err()
+}
+
+func (c *SendContext) Value(key interface{}) interface{} {
+	return c.ctx.Value(key)
 }

internal/rpc/msg/filters.go

@@ -4,3 +4,6 @@ import pbChat "Open_IM/pkg/proto/chat"
 
 // BeforeSendFilter handles custom logic before send msg.
 type BeforeSendFilter func(ctx *SendContext, pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, bool, error)
+
+// AfterSendFilter handles custom logic after send msg.
+type AfterSendFilter func(ctx *SendContext, req *pbChat.SendMsgReq, res *pbChat.SendMsgResp) (*pbChat.SendMsgResp, bool, error)

internal/rpc/msg/rpcChat.go

@@ -23,6 +23,9 @@ type rpcChat struct {
 	producer        *kafka.Producer
 	// beforeSenders are filters which will be triggered before send msg
 	beforeSenders []BeforeSendFilter
+
+	// afterSenders are filters which will be triggered after send msg
+	afterSenders []AfterSendFilter
 }
 
 func NewRpcChatServer(port int) *rpcChat {
@@ -42,6 +45,11 @@ func (rpc *rpcChat) UseBeforSendFilters(hs ...BeforeSendFilter) {
 	rpc.beforeSenders = append(rpc.beforeSenders, hs...)
 }
 
+// UseAfterSendFilters attaches a global filter to the AfterSendFilter logic
+func (rpc *rpcChat) UseAfterSendFilters(hs ...AfterSendFilter) {
+	rpc.afterSenders = append(rpc.afterSenders, hs...)
+}
+
 func (rpc *rpcChat) Run() {
 	log.Info("", "", "rpc get_token init...")
 

internal/rpc/msg/widget/before_sender.go

@@ -1,10 +0,0 @@
-package widget
-
-import (
-	"context"
-
-	pbChat "Open_IM/pkg/proto/chat"
-)
-
-// BeforeSendHandler handles custom logic before send msg.
-type BeforeSendHandler func(ctx context.Context, pb *pbChat.SendMsgReq) (*pbChat.SendMsgResp, bool, error)