Add Kafka asynchronous send support (#2409)

* Add Kafka asynchronous send support

* Add Kafka asynchronous send support

* Upgrade sarama to 1.30.1

* Example

plugins/broker/kafka/README.md

@@ -0,0 +1,24 @@
+# Kafka Broker
+
+
+## Async Publish
+```go
+import "github.com/Shopify/sarama"
+
+func AsyncProduceMessage()  {
+    var errorsChan = make(chan *sarama.ProducerError)
+    var successesChan = make(chan *sarama.ProducerMessage)
+    go func() {
+        for err := range errorsChan {
+            fmt.Println(err)
+        }
+    }
+    go func() {
+        for v := range successesChan {
+            fmt.Println(v)
+        }
+    }
+    b := NewBroker(AsyncProducer(errorsChan,successesChan))
+    b.Publish(`topic`, &broker.Message{})
+}
+```

plugins/broker/kafka/context.go

@@ -2,7 +2,6 @@ package kafka
 
 import (
 	"context"
-
 	"go-micro.dev/v4/broker"
 	"go-micro.dev/v4/server"
 )

plugins/broker/kafka/go.mod

@@ -3,7 +3,7 @@ module github.com/asim/go-micro/plugins/broker/kafka/v4
 go 1.17
 
 require (
-	github.com/Shopify/sarama v1.29.1
+	github.com/Shopify/sarama v1.30.1
 	github.com/google/uuid v1.2.0
 	go-micro.dev/v4 v4.2.1
 )
@@ -24,7 +24,7 @@ require (
 	github.com/go-git/go-billy/v5 v5.3.1 // indirect
 	github.com/go-git/go-git/v5 v5.4.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
-	github.com/golang/snappy v0.0.3 // indirect
+	github.com/golang/snappy v0.0.4 // indirect
 	github.com/google/go-cmp v0.5.6 // indirect
 	github.com/hashicorp/go-uuid v1.0.2 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
@@ -35,13 +35,13 @@ require (
 	github.com/jcmturner/gokrb5/v8 v8.4.2 // indirect
 	github.com/jcmturner/rpc/v2 v2.0.3 // indirect
 	github.com/kevinburke/ssh_config v0.0.0-20201106050909-4977a11b4351 // indirect
-	github.com/klauspost/compress v1.12.2 // indirect
+	github.com/klauspost/compress v1.13.6 // indirect
 	github.com/miekg/dns v1.1.43 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/nxadm/tail v1.4.8 // indirect
 	github.com/oxtoacart/bpool v0.0.0-20190530202638-03653db5a59c // indirect
 	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
-	github.com/pierrec/lz4 v2.6.0+incompatible // indirect
+	github.com/pierrec/lz4 v2.6.1+incompatible // indirect
 	github.com/pkg/errors v0.9.1 // indirect
 	github.com/rcrowley/go-metrics v0.0.0-20201227073835-cf1acfcdf475 // indirect
 	github.com/russross/blackfriday/v2 v2.0.1 // indirect
@@ -49,11 +49,11 @@ require (
 	github.com/shurcooL/sanitized_anchor_name v1.0.0 // indirect
 	github.com/urfave/cli/v2 v2.3.0 // indirect
 	github.com/xanzy/ssh-agent v0.3.0 // indirect
-	golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e // indirect
+	golang.org/x/crypto v0.0.0-20210920023735-84f357641f63 // indirect
-	golang.org/x/net v0.0.0-20210614182718-04defd469f4e // indirect
+	golang.org/x/net v0.0.0-20210917221730-978cfadd31cf // indirect
 	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c // indirect
 	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
-	golang.org/x/text v0.3.6 // indirect
+	golang.org/x/text v0.3.7 // indirect
 	google.golang.org/protobuf v1.26.0 // indirect
 	gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect

plugins/broker/kafka/go.sum

@@ -54,10 +54,12 @@ github.com/OpenDNS/vegadns2client v0.0.0-20180418235048-a3fa4a771d87/go.mod h1:i
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7 h1:YoJbenK9C67SkzkDfmQuVln04ygHj3vjZfd9FL+GmQQ=
 github.com/ProtonMail/go-crypto v0.0.0-20210428141323-04723f9f07d7/go.mod h1:z4/9nQmJSSwwds7ejkxaJwO37dru3geImFUdJlaLzQo=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
-github.com/Shopify/sarama v1.29.1 h1:wBAacXbYVLmWieEA/0X/JagDdCZ8NVFOfS6l6+2u5S0=
+github.com/Shopify/sarama v1.30.1 h1:z47lP/5PBw2UVKf1lvfS5uWXaJws6ggk9PLnKEHtZiQ=
-github.com/Shopify/sarama v1.29.1/go.mod h1:mdtqvCSg8JOxk8PmpTNGyo6wzd4BMm4QXSfDnTXmgkE=
+github.com/Shopify/sarama v1.30.1/go.mod h1:hGgx05L/DiW8XYBXeJdKIN6V2QUy2H6JqME5VT1NLRw=
 github.com/Shopify/toxiproxy v2.1.4+incompatible h1:TKdv8HiTLgE5wdJuEML90aBgNWsokNbMijUGhmcoBJc=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
+github.com/Shopify/toxiproxy/v2 v2.1.6-0.20210914104332-15ea381dcdae h1:ePgznFqEG1v3AjMklnK8H7BSc++FDSo7xfK9K7Af+0Y=
+github.com/Shopify/toxiproxy/v2 v2.1.6-0.20210914104332-15ea381dcdae/go.mod h1:/cvHQkZ1fst0EmZnA5dFtiQdWCNCFYzb+uE2vqVgvx0=
 github.com/acomagu/bufpipe v1.0.3 h1:fxAGrHZTgQ9w5QqVItgzwj235/uYZYgbXitB+dLupOk=
 github.com/acomagu/bufpipe v1.0.3/go.mod h1:mxdxdup/WdsKVreO5GpW4+M/1CE2sMG4jeGJ2sYmHc4=
 github.com/ajstarks/svgo v0.0.0-20180226025133-644b8db467af/go.mod h1:K08gAheRH3/J6wwsYMMT4xOr94bZjxIelGM0+d/wbFw=
@@ -215,8 +217,8 @@ github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaS
 github.com/golang/protobuf v1.5.2 h1:ROPKBNFfQgOUMifHyP+KYbvpjbdoFNs+aK7DXlji0Tw=
 github.com/golang/protobuf v1.5.2/go.mod h1:XVQd3VNwM+JqD3oG2Ue2ip4fOMUkwXdXDdiuN0vRsmY=
 github.com/golang/snappy v0.0.0-20180518054509-2e65f85255db/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
-github.com/golang/snappy v0.0.3 h1:fHPg5GQYlCeLIPB9BZqMVR5nR9A+IM5zcgeTdjMYmLA=
+github.com/golang/snappy v0.0.4 h1:yAGX7huGHXlcLOEtBnF4w7FQwA26wojNCwOYAEhLjQM=
-github.com/golang/snappy v0.0.3/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
+github.com/golang/snappy v0.0.4/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/golangci/lint-1 v0.0.0-20181222135242-d2cdd8c08219/go.mod h1:/X8TswGSh1pIozq4ZwCfxS0WA5JGXguxk94ar/4c87Y=
 github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
@@ -327,8 +329,8 @@ github.com/kisielk/errcheck v1.1.0/go.mod h1:EZBBE59ingxPouuu3KfxchcWSUPOHkagtvW
 github.com/kisielk/errcheck v1.2.0/go.mod h1:/BMXB+zMLi60iA8Vv6Ksmxu/1UDYcXs4uQLJ+jE2L00=
 github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8=
 github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck=
-github.com/klauspost/compress v1.12.2 h1:2KCfW3I9M7nSc5wOqXAlW2v2U6v+w6cbjvbfp+OykW8=
+github.com/klauspost/compress v1.13.6 h1:P76CopJELS0TiO2mebmnzgWaajssP/EszplttgQxcgc=
-github.com/klauspost/compress v1.12.2/go.mod h1:8dP1Hq4DHOhN9w426knH3Rhby4rFm6D8eO+e+Dq5Gzg=
+github.com/klauspost/compress v1.13.6/go.mod h1:/3/Vjq9QcHkK5uEr5lBEmyoZ1iFhe47etQ6QUkpK6sk=
 github.com/kolo/xmlrpc v0.0.0-20200310150728-e0350524596b/go.mod h1:o03bZfuBwAXHetKXuInt4S7omeXUu62/A845kiycsSQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
 github.com/konsorten/go-windows-terminal-sequences v1.0.2/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
@@ -429,8 +431,8 @@ github.com/patrickmn/go-cache v2.1.0+incompatible/go.mod h1:3Qf8kWWT7OJRJbdiICTK
 github.com/pelletier/go-toml v1.2.0/go.mod h1:5z9KED0ma1S8pY6P1sdut58dfprrGBbd/94hg7ilaic=
 github.com/pelletier/go-toml v1.8.1/go.mod h1:T2/BmBdy8dvIRq1a/8aqjN41wvWlN4lrapLU/GW4pbc=
 github.com/pierrec/lz4 v2.0.5+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
-github.com/pierrec/lz4 v2.6.0+incompatible h1:Ix9yFKn1nSPBLFl/yZknTp8TU5G4Ps0JDmguYK6iH1A=
+github.com/pierrec/lz4 v2.6.1+incompatible h1:9UY3+iC23yxF0UfGaYrGplQ+79Rg+h/q9FV9ix19jjM=
-github.com/pierrec/lz4 v2.6.0+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
+github.com/pierrec/lz4 v2.6.1+incompatible/go.mod h1:pdkljMzZIN41W+lC3N2tnIh5sFi+IEE17M5jbnwPHcY=
 github.com/pkg/errors v0.8.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
@@ -482,6 +484,7 @@ github.com/sirupsen/logrus v1.2.0/go.mod h1:LxeOpSwHxABJmUn/MG1IvRgCAasNZTLOkJPx
 github.com/sirupsen/logrus v1.4.1/go.mod h1:ni0Sbl8bgC9z8RoU9G6nDWqqs/fq4eDPysMBDgk/93Q=
 github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
 github.com/sirupsen/logrus v1.7.0/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
+github.com/sirupsen/logrus v1.8.1/go.mod h1:yWOB1SBYBC5VeMP7gHvWumXLIWorT60ONWic61uBYv0=
 github.com/skratchdot/open-golang v0.0.0-20160302144031-75fb7ed4208c/go.mod h1:sUM3LWHvSMaG192sy56D9F7CNvL7jUJVXoqM1QKLnog=
 github.com/smartystreets/assertions v0.0.0-20180927180507-b2de0cb4f26d/go.mod h1:OnSkiWE9lh6wB0YB77sQom3nweQdgAjqCqsofrRNTgc=
 github.com/smartystreets/assertions v1.0.1/go.mod h1:kHHU4qYBaI3q23Pp3VPrmWhuIUrLW/7eUrw0BU5VaoM=
@@ -532,8 +535,9 @@ github.com/vinyldns/go-vinyldns v0.0.0-20200917153823-148a5f6b8f14/go.mod h1:RWc
 github.com/vultr/govultr/v2 v2.0.0/go.mod h1:2PsEeg+gs3p/Fo5Pw8F9mv+DUBEOlrNZ8GmCTGmhOhs=
 github.com/xanzy/ssh-agent v0.3.0 h1:wUMzuKtKilRgBAD1sUb8gOwwRr2FGoBVumcjoOACClI=
 github.com/xanzy/ssh-agent v0.3.0/go.mod h1:3s9xbODqPuuhK9JV1R321M/FlMZSBvE5aY6eAcqrDh0=
-github.com/xdg/scram v1.0.3/go.mod h1:lB8K/P019DLNhemzwFU4jHLhdvlE6uDZjXFejJXr49I=
+github.com/xdg-go/pbkdf2 v1.0.0/go.mod h1:jrpuAogTd400dnrH08LKmI/xc1MbPOebTwRqcT5RDeI=
-github.com/xdg/stringprep v1.0.3/go.mod h1:Jhud4/sHMO4oL310DaZAKk9ZaJ08SJfe+sJh0HrGL1Y=
+github.com/xdg-go/scram v1.0.2/go.mod h1:1WAq6h33pAW+iRreB34OORO2Nf7qel3VV3fjBj+hCSs=
+github.com/xdg-go/stringprep v1.0.2/go.mod h1:8F9zXuvzgwmyT5DUm4GUfZGDdT3W+LCvS6+da4O5kxM=
 github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f/go.mod h1:N2zxlSyiKSe5eX1tZViRH5QA0qijqEDrYZiPEAiq3wU=
 github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415/go.mod h1:GwrjFmJcFw6At/Gs6z4yjiIwzuJ1/+UwLxMQDVQXShQ=
 github.com/xeipuuv/gojsonschema v1.2.0/go.mod h1:anYRn/JVcOK2ZgGU+IjEV4nwlhoK5sQluxsYJ78Id3Y=
@@ -541,7 +545,6 @@ github.com/xiang90/probing v0.0.0-20190116061207-43a291ad63a2/go.mod h1:UETIi67q
 github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74=
 go.etcd.io/bbolt v1.3.2/go.mod h1:IbVyRI1SCnLcuJnV2u8VeU0CEYM7e686BmAb1XKL+uU=
-go.m3o.com v0.1.0/go.mod h1:p8FdLqZH3R9a0y04qiMNT+clw69d3SxyQPFzCNbDRtk=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.20.2/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 go.opencensus.io v0.21.0/go.mod h1:mSImk1erAIZhrmZN+AvHh14ztQfjbGwt4TtuofqLduU=
@@ -572,8 +575,8 @@ golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWP
 golang.org/x/crypto v0.0.0-20210322153248-0c34fe9e7dc2/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b/go.mod h1:T9bdIzuCu7OtxOm1hfPfRQxPLYneinmdGuTeoZ9dtd4=
 golang.org/x/crypto v0.0.0-20210513164829-c07d793c2f9a/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8=
-golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e h1:gsTQYXdTw2Gq7RBsWvlQ91b+aEQ6bXFUngBGuR8sPpI=
+golang.org/x/crypto v0.0.0-20210920023735-84f357641f63 h1:kETrAMYZq6WVGPa8IIixL0CaEcIUNi+1WX7grUoi3y8=
-golang.org/x/crypto v0.0.0-20210616213533-5ff15b29337e/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/crypto v0.0.0-20210920023735-84f357641f63/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/exp v0.0.0-20180321215751-8460e604b9de/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20180807140117-3d87b88a115f/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -642,8 +645,8 @@ golang.org/x/net v0.0.0-20210220033124-5f55cee0dc0d/go.mod h1:m0MpNAwzfU5UDzcl9v
 golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/net v0.0.0-20210326060303-6b1517762897/go.mod h1:uSPa2vr4CLtc/ILN5odXGNXS6mhrKVzTaCXzk9m6W3k=
 golang.org/x/net v0.0.0-20210510120150-4163338589ed/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
-golang.org/x/net v0.0.0-20210614182718-04defd469f4e h1:XpT3nA5TvE525Ne3hInMh6+GETgn27Zfm9dxsThnX2Q=
+golang.org/x/net v0.0.0-20210917221730-978cfadd31cf h1:R150MpwJIv1MpS0N/pc+NhTM8ajzvlmxlY5OYsrevXQ=
-golang.org/x/net v0.0.0-20210614182718-04defd469f4e/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
+golang.org/x/net v0.0.0-20210917221730-978cfadd31cf/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
 golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -726,8 +729,10 @@ golang.org/x/text v0.3.1-0.20180807135948-17ff2d5776d2/go.mod h1:NqM8EUOU14njkJ3
 golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
 golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.4/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.6 h1:aRYxNxv6iGQlyVaZmk6ZgYEDa+Jg18DxebPSrd6bg1M=
+golang.org/x/text v0.3.5/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.7 h1:olpwvP2KacW1ZWvsR7uQhoyTYvKAupfQrRGBFM352Gk=
+golang.org/x/text v0.3.7/go.mod h1:u+2+/6zg+i71rQMx5EYifcz6MCKuco9NR6JIITiCfzQ=
 golang.org/x/time v0.0.0-20181108054448-85acf8d2951c/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20190308202827-9d24e82272b4/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=
 golang.org/x/time v0.0.0-20191024005414-555d28b269f0/go.mod h1:tRJNPiyCQ0inRvYxbN9jk5I+vvW/OXSQhTDSoE431IQ=

plugins/broker/kafka/kafka.go

@@ -3,6 +3,7 @@ package kafka
 
 import (
 	"context"
+	"errors"
 	"sync"
 
 	"github.com/Shopify/sarama"
@@ -16,8 +17,9 @@ import (
 type kBroker struct {
 	addrs []string
 
-	c sarama.Client
+	c  sarama.Client
-	p sarama.SyncProducer
+	p  sarama.SyncProducer
+	ap sarama.AsyncProducer
 
 	sc []sarama.Client
 
@@ -105,14 +107,51 @@ func (k *kBroker) Connect() error {
 		return err
 	}
 
-	p, err := sarama.NewSyncProducerFromClient(c)
+	var (
-	if err != nil {
+		ap                   sarama.AsyncProducer
-		return err
+		p                    sarama.SyncProducer
+		errChan, successChan = k.getAsyncProduceChan()
+	)
+
+	// Because error chan must require, so only error chan
+	// If set the error chan, will use async produce
+	// else use sync produce
+	// only keep one client resource, is c variable
+	if errChan != nil {
+		ap, err = sarama.NewAsyncProducerFromClient(c)
+		if err != nil {
+			return err
+		}
+		// When the ap closed, the Errors() & Successes() channel will be closed
+		// So the goroutine will auto exit
+		go func() {
+			for v := range ap.Errors() {
+				errChan <- v
+			}
+		}()
+
+		if successChan != nil {
+			go func() {
+				for v := range ap.Successes() {
+					successChan <- v
+				}
+			}()
+		}
+	} else {
+		p, err = sarama.NewSyncProducerFromClient(c)
+		if err != nil {
+			return err
+		}
 	}
 
 	k.scMutex.Lock()
 	k.c = c
-	k.p = p
+	if p != nil {
+		k.p = p
+	}
+	if ap != nil {
+		k.ap = ap
+	}
 	k.sc = make([]sarama.Client, 0)
 	k.connected = true
 	k.scMutex.Unlock()
@@ -130,6 +169,9 @@ func (k *kBroker) Disconnect() error {
 	if k.p != nil {
 		k.p.Close()
 	}
+	if k.ap != nil {
+		k.ap.Close()
+	}
 	if err := k.c.Close(); err != nil {
 		return err
 	}
@@ -164,11 +206,21 @@ func (k *kBroker) Publish(topic string, msg *broker.Message, opts ...broker.Publ
 	if err != nil {
 		return err
 	}
-	_, _, err = k.p.SendMessage(&sarama.ProducerMessage{
+
-		Topic: topic,
+	var produceMsg = &sarama.ProducerMessage{
-		Value: sarama.ByteEncoder(b),
+		Topic:    topic,
-	})
+		Value:    sarama.ByteEncoder(b),
-	return err
+		Metadata: msg,
+	}
+	if k.ap != nil {
+		k.ap.Input() <- produceMsg
+		return nil
+	} else if k.p != nil {
+		_, _, err = k.p.SendMessage(produceMsg)
+		return err
+	}
+
+	return errors.New(`no connection resources available`)
 }
 
 func (k *kBroker) getSaramaClusterClient(topic string) (sarama.Client, error) {
@@ -270,6 +322,20 @@ func (k *kBroker) getBrokerConfig() *sarama.Config {
 	return DefaultBrokerConfig
 }
 
+func (k *kBroker) getAsyncProduceChan() (chan<- *sarama.ProducerError, chan<- *sarama.ProducerMessage) {
+	var (
+		errors    chan<- *sarama.ProducerError
+		successes chan<- *sarama.ProducerMessage
+	)
+	if c, ok := k.opts.Context.Value(asyncProduceErrorKey{}).(chan<- *sarama.ProducerError); ok {
+		errors = c
+	}
+	if c, ok := k.opts.Context.Value(asyncProduceSuccessKey{}).(chan<- *sarama.ProducerMessage); ok {
+		successes = c
+	}
+	return errors, successes
+}
+
 func (k *kBroker) getClusterConfig() *sarama.Config {
 	if c, ok := k.opts.Context.Value(clusterConfigKey{}).(*sarama.Config); ok {
 		return c

plugins/broker/kafka/options.go

@@ -24,6 +24,21 @@ func ClusterConfig(c *sarama.Config) broker.Option {
 	return setBrokerOption(clusterConfigKey{}, c)
 }
 
+type asyncProduceErrorKey struct{}
+type asyncProduceSuccessKey struct{}
+
+func AsyncProducer(errors chan<- *sarama.ProducerError, successes chan<- *sarama.ProducerMessage) broker.Option {
+	// set default opt
+	var opt = func(options *broker.Options) {}
+	if successes != nil {
+		opt = setBrokerOption(asyncProduceSuccessKey{}, successes)
+	}
+	if errors != nil {
+		opt = setBrokerOption(asyncProduceErrorKey{}, errors)
+	}
+	return opt
+}
+
 type subscribeContextKey struct{}
 
 // SubscribeContext set the context for broker.SubscribeOption