{"id":46846,"date":"2023-03-11T08:33:07","date_gmt":"2023-04-01T06:53:56","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%8e%a5%e6%94%b6kafka%e6%b6%88%e6%81%af\/"},"modified":"2024-01-15T12:12:56","modified_gmt":"2024-01-15T04:12:56","slug":"%e6%8e%a5%e6%94%b6kafka%e6%b6%88%e6%81%af","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%8e%a5%e6%94%b6kafka%e6%b6%88%e6%81%af\/","title":{"rendered":"\u63a5\u6536Kafka\u6d88\u606f"},"content":{"rendered":"

\u4eca\u5929\u6211\u4eec\u8981\u770b\u4e00\u4e0b\u6628\u5929\u53d1\u9001\u7684\u6d88\u606f\u7684\u63a5\u6536\u5904\u7406\u3002<\/p>\n

\u3010\u6f0f\u6d1e\u4fee\u590d\u3011<\/h2>\n

\u5728\u8fd9\u4e4b\u524d\uff0c\u6211\u5c06\u4fee\u590d\u4e00\u4e2a\u9519\u8bef\u3002
\n\u6211\u5df2\u7ecf\u4f7f\u7528\u4ee5\u4e0b\u7c7b\u578b\u5b9e\u65bd\u4e86substrate.Message\u3002<\/p>\n

type<\/span> message<\/span> []<\/span>byte<\/span>\r\n\r\nfunc<\/span> (<\/span>m<\/span> message<\/span>)<\/span> Data<\/span>()<\/span> []<\/span>byte<\/span> {<\/span>\r\n    return<\/span> m<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u7136\u800c\uff0c\u5728substrate\u5e93\u4e2d\u6709\u4ee5\u4e0b\u7684\u63cf\u8ff0\uff0c\u7531\u4e8eslice\u65e0\u6cd5\u4f7f\u7528==\/!=\u8fd0\u7b97\u7b26\u8fdb\u884c\u6bd4\u8f83\uff0c\u56e0\u6b64\u4f1a\u53d1\u751f\u6050\u614c\u3002<\/p>\n
    https:\/\/github.com\/uw-labs\/substrate\/blob\/master\/sync_adapter_sink.go#L98<\/ul>\n
    if<\/span> msg<\/span>.<\/span>Message<\/span> !=<\/span> req<\/span>.<\/span>m<\/span> {<\/span>\r\n    panic<\/span>(<\/span>fmt<\/span>.<\/span>Sprintf<\/span>(<\/span>\"wrong message expected: %s got: %s\"<\/span>,<\/span> req<\/span>.<\/span>m<\/span>,<\/span> msg<\/span>.<\/span>Message<\/span>))<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u6240\u4ee5\u6211\u4eec\u5c06\u8c03\u6574message\u578b\u5982\u4e0b\u3002<\/p>\n
    type<\/span> message<\/span> struct<\/span>{<\/span> data<\/span> []<\/span>byte<\/span> }<\/span>\r\n\r\nfunc<\/span> (<\/span>m<\/span> *<\/span>message<\/span>)<\/span> Data<\/span>()<\/span> []<\/span>byte<\/span> {<\/span>\r\n    return<\/span> m<\/span>.<\/span>data<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u8bf7\u67e5\u770b\u5b58\u50a8\u5e93\uff0c\u56e0\u4e3a\u547c\u53eb\u65b9\u4e5f\u9700\u8981\u8fdb\u884c\u4e00\u4e9b\u5c0f\u7684\u66f4\u6539\u3002\u4fee\u6539\u5df2\u5b8c\u6210\u3002<\/p>\n
    \u521b\u5efaSubstrate.SynchronousMessageSource<\/h2>\n
    \u4ecesubstrate\u5e93\u4e2d\u63d0\u4f9b\u4e86\u7528\u4e8e\u63a5\u6536\u6d88\u606f\u7684Source\u5bf9\u8c61\u63a5\u53e3\u3002
    \n\u901a\u8fc7\u5b9a\u4e49initializeKafkaSource()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u521b\u5efaSource\u5bf9\u8c61\u3002<\/p>\n
    func<\/span> initialiseKafkaSource<\/span>(<\/span>version<\/span>,<\/span> brokers<\/span>,<\/span> topic<\/span>,<\/span> consumer<\/span> *<\/span>string<\/span>,<\/span> offsetOldest<\/span> *<\/span>bool<\/span>)<\/span> (<\/span>substrate<\/span>.<\/span>SynchronousMessageSource<\/span>,<\/span> error<\/span>)<\/span> {<\/span>\r\n    var<\/span> kafkaOffset<\/span> int64<\/span>\r\n    if<\/span> *<\/span>offsetOldest<\/span> {<\/span>\r\n        kafkaOffset<\/span> =<\/span> kafka<\/span>.<\/span>OffsetOldest<\/span>\r\n    }<\/span> else<\/span> {<\/span>\r\n        kafkaOffset<\/span> =<\/span> kafka<\/span>.<\/span>OffsetNewest<\/span>\r\n    }<\/span>\r\n\r\n    source<\/span>,<\/span> err<\/span> :=<\/span> kafka<\/span>.<\/span>NewAsyncMessageSource<\/span>(<\/span>kafka<\/span>.<\/span>AsyncMessageSourceConfig<\/span>{<\/span>\r\n        ConsumerGroup<\/span>:<\/span> *<\/span>consumer<\/span>,<\/span>\r\n        Topic<\/span>:<\/span>         *<\/span>topic<\/span>,<\/span>\r\n        Brokers<\/span>:<\/span>       strings<\/span>.<\/span>Split<\/span>(<\/span>*<\/span>brokers<\/span>,<\/span> \",\"<\/span>),<\/span>\r\n        Offset<\/span>:<\/span>        kafkaOffset<\/span>,<\/span>\r\n        Version<\/span>:<\/span>       *<\/span>version<\/span>,<\/span>\r\n    })<\/span>\r\n    if<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        return<\/span> nil<\/span>,<\/span> err<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> substrate<\/span>.<\/span>NewSynchronousMessageSource<\/span>(<\/span>source<\/span>),<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u547c\u53eb\u65b9\u7684\u6837\u5b50\u5c31\u662f\u8fd9\u6837\u3002<\/p>\n
    sourceKafkaVersion<\/span> :=<\/span> app<\/span>.<\/span>String<\/span>(<\/span>cli<\/span>.<\/span>StringOpt<\/span>{<\/span>\r\n    Name<\/span>:<\/span>   \"source-kafka-version\"<\/span>,<\/span>\r\n    Desc<\/span>:<\/span>   \"source kafka version\"<\/span>,<\/span>\r\n    EnvVar<\/span>:<\/span> \"SOURCE_KAFKA_VERSION\"<\/span>,<\/span>\r\n})<\/span>\r\nsourceBrokers<\/span> :=<\/span> app<\/span>.<\/span>String<\/span>(<\/span>cli<\/span>.<\/span>StringOpt<\/span>{<\/span>\r\n    Name<\/span>:<\/span>   \"source-brokers\"<\/span>,<\/span>\r\n    Desc<\/span>:<\/span>   \"kafka source brokers\"<\/span>,<\/span>\r\n    EnvVar<\/span>:<\/span> \"SOURCE_BROKERS\"<\/span>,<\/span>\r\n    Value<\/span>:<\/span>  \"localhost:9092\"<\/span>,<\/span>\r\n})<\/span>\r\nconsumerID<\/span> :=<\/span> app<\/span>.<\/span>String<\/span>(<\/span>cli<\/span>.<\/span>StringOpt<\/span>{<\/span>\r\n    Name<\/span>:<\/span>   \"consumer-id\"<\/span>,<\/span>\r\n    Desc<\/span>:<\/span>   \"consumer id to connect to source\"<\/span>,<\/span>\r\n    EnvVar<\/span>:<\/span> \"CONSUMER_ID\"<\/span>,<\/span>\r\n    Value<\/span>:<\/span>  appName<\/span>,<\/span>\r\n})<\/span>\r\nkafkaOffsetOldest<\/span> :=<\/span> app<\/span>.<\/span>Bool<\/span>(<\/span>cli<\/span>.<\/span>BoolOpt<\/span>{<\/span>\r\n    Name<\/span>:<\/span>   \"kafka-offset-oldest\"<\/span>,<\/span>\r\n    Desc<\/span>:<\/span>   \"If set to true, will start consuming from the oldest available messages\"<\/span>,<\/span>\r\n    EnvVar<\/span>:<\/span> \"KAFKA_OFFSET_OLDEST\"<\/span>,<\/span>\r\n    Value<\/span>:<\/span>  true<\/span>,<\/span>\r\n})<\/span>\r\n\r\n...<\/span>\r\n\r\nactionSource<\/span>,<\/span> err<\/span> :=<\/span> initialiseKafkaSource<\/span>(<\/span>sourceKafkaVersion<\/span>,<\/span> sourceBrokers<\/span>,<\/span> actionTopic<\/span>,<\/span> consumerID<\/span>,<\/span> kafkaOffsetOldest<\/span>)<\/span>\r\nif<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n    log<\/span>.<\/span>WithError<\/span>(<\/span>err<\/span>)<\/span>.<\/span>Fatalln<\/span>(<\/span>\"init action event kafka source\"<\/span>)<\/span>\r\n}<\/span>\r\ndefer<\/span> actionSource<\/span>.<\/span>Close<\/span>()<\/span>\r\n<\/code><\/pre>\n
    \u521b\u5efa\u6d88\u606f\u5904\u7406\u7a0b\u5e8f<\/h2>\n
    \u4ee5\u4e0b\u662f\u5728 substrate.SynchronousMessageSource\u63a5\u53e3\u4e2d\u5b9a\u4e49\u7684\u65b9\u6cd5\u3002<\/p>\n
    type<\/span> SynchronousMessageSource<\/span> interface<\/span> {<\/span>\r\n    ...<\/span>\r\n    \/\/ ConsumeMessages calls the `handler` function for each messages<\/span>\r\n    \/\/ available to consume.  If the handler returns no error, an<\/span>\r\n    \/\/ acknowledgement will be sent to the broker.  If an error is returned<\/span>\r\n    \/\/ by the handler, it will be propogated and returned from this<\/span>\r\n    \/\/ function.  This function will block until `ctx` is done or until an<\/span>\r\n    \/\/ error occurs.<\/span>\r\n    ConsumeMessages<\/span>(<\/span>ctx<\/span> context<\/span>.<\/span>Context<\/span>,<\/span> handler<\/span> ConsumerMessageHandler<\/span>)<\/span> error<\/span>\r\n    ...<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u8fd9\u4e2a\u53c2\u6570\u6240\u4ee3\u8868\u7684substrate.ConsumerMessageHandler\u88ab\u5b9a\u4e49\u5982\u4e0b\uff0c\u4f5c\u4e3a\u5904\u7406\u6d88\u606f\u7684\u5904\u7406\u5668\u6765\u5b9e\u73b0\u5b83\u3002<\/p>\n
    \/\/ ConsumerMessageHandler is the callback function type that synchronous<\/span>\r\n\/\/ message consumers must implement.<\/span>\r\ntype<\/span> ConsumerMessageHandler<\/span> func<\/span>(<\/span>context<\/span>.<\/span>Context<\/span>,<\/span> Message<\/span>)<\/span> error<\/span>\r\n<\/code><\/pre>\n
    \u56e0\u6b64\uff0c\u7528\u4e8e\u5904\u7406\u7a0b\u5e8f\u7684actionEventHandler\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
    type<\/span> actionEventHandler<\/span> struct<\/span> {<\/span>\r\n    todoMgr<\/span> todoManager<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> newActionEventHandler<\/span>(<\/span>todoMgr<\/span> todoManager<\/span>)<\/span> actionEventHandler<\/span> {<\/span>\r\n    return<\/span> actionEventHandler<\/span>{<\/span>todoMgr<\/span>:<\/span> todoMgr<\/span>}<\/span>\r\n}<\/span>\r\n\r\nfunc<\/span> (<\/span>h<\/span> actionEventHandler<\/span>)<\/span> handle<\/span>(<\/span>ctx<\/span> context<\/span>.<\/span>Context<\/span>,<\/span> msg<\/span> substrate<\/span>.<\/span>Message<\/span>)<\/span> error<\/span> {<\/span>\r\n    var<\/span> env<\/span> envelope<\/span>.<\/span>Event<\/span>\r\n    if<\/span> err<\/span> :=<\/span> proto<\/span>.<\/span>Unmarshal<\/span>(<\/span>msg<\/span>.<\/span>Data<\/span>(),<\/span> &<\/span>env<\/span>);<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        return<\/span> errors<\/span>.<\/span>Wrap<\/span>(<\/span>err<\/span>,<\/span> \"failed to unmarshal message\"<\/span>)<\/span>\r\n    }<\/span>\r\n\r\n    if<\/span> types<\/span>.<\/span>Is<\/span>(<\/span>env<\/span>.<\/span>Payload<\/span>,<\/span> &<\/span>event<\/span>.<\/span>CreateTodoActionEvent<\/span>{})<\/span> {<\/span>\r\n        var<\/span> ev<\/span> event<\/span>.<\/span>CreateTodoActionEvent<\/span>\r\n        if<\/span> err<\/span> :=<\/span> types<\/span>.<\/span>UnmarshalAny<\/span>(<\/span>env<\/span>.<\/span>Payload<\/span>,<\/span> &<\/span>ev<\/span>);<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            return<\/span> errors<\/span>.<\/span>Wrap<\/span>(<\/span>err<\/span>,<\/span> \"failed to unmarshal payload\"<\/span>)<\/span>\r\n        }<\/span>\r\n\r\n        if<\/span> err<\/span> :=<\/span> h<\/span>.<\/span>todoMgr<\/span>.<\/span>projectTodo<\/span>(<\/span>todo<\/span>{<\/span>\r\n            id<\/span>:<\/span>          ev<\/span>.<\/span>Id<\/span>,<\/span>\r\n            title<\/span>:<\/span>       ev<\/span>.<\/span>Title<\/span>,<\/span>\r\n            description<\/span>:<\/span> ev<\/span>.<\/span>Description<\/span>,<\/span>\r\n        });<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n            return<\/span> errors<\/span>.<\/span>Wrap<\/span>(<\/span>err<\/span>,<\/span> \"failed to project a todo\"<\/span>)<\/span>\r\n        }<\/span>\r\n    }<\/span>\r\n\r\n    return<\/span> nil<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
    \u628a\u4ecemsg.Data()\u5230\u4e8b\u4ef6\u7684\u62c6\u89e3\u5904\u7406\u548c\u524d\u51e0\u5929\u5728keyFunc\u7ae0\u8282\u4e2d\u770b\u5230\u7684\u975e\u5e38\u76f8\u4f3c\u554a\u3002
    \n\u5c06\u63d0\u53d6\u7684\u4e8b\u4ef6\u4fdd\u5b58\u5904\u7406\u4e0e\u540c\u6b65\u5904\u7406\u65f6\u5728\u670d\u52a1\u5668\u7ed3\u6784\u4f53\u4e2d\u5b9e\u73b0\u7684\u5b8c\u5168\u4e00\u6837\u3002
    \n\u5bf9\u4e0d\u8d77\uff0c\u6d4b\u8bd5\u90e8\u5206\u7701\u7565\u4e86\u3002<\/p>\n
    \u8bf7\u786e\u8ba4\u6839\u636e\u5bf9todo\u7684id\u5904\u7406\u6240\u505a\u7684\u66f4\u6539\uff0c\u76f8\u5e94\u5730\u8fdb\u884c\u4e86\u4e00\u4e9b\u6570\u636e\u7c7b\u578b\u548ctodoManager\u63a5\u53e3\u7684\u53d8\u66f4\u3002<\/p>\n
    \u63a5\u6536\u6d88\u606f\u8fdb\u7a0b\u7684\u5f00\u59cb<\/h2>\n
    \u5728 main.go \u5185\u542f\u52a8\u4e00\u4e2a\u65b0\u7684 goroutine \u6765\u63a5\u6536\u6d88\u606f\u3002<\/p>\n
    wg<\/span>.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>\r\ngo<\/span> func<\/span>()<\/span> {<\/span>\r\n    defer<\/span> wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n\r\n    h<\/span> :=<\/span> newActionEventHandler<\/span>(<\/span>store<\/span>)<\/span>\r\n    if<\/span> err<\/span> :=<\/span> actionSource<\/span>.<\/span>ConsumeMessages<\/span>(<\/span>context<\/span>.<\/span>Background<\/span>(),<\/span> h<\/span>.<\/span>handle<\/span>);<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        errCh<\/span> <-<\/span> errors<\/span>.<\/span>Wrap<\/span>(<\/span>err<\/span>,<\/span> \"failed to consume action event\"<\/span>)<\/span>\r\n    }<\/span>\r\n}()<\/span>\r\n<\/code><\/pre>\n
    \u8fd9\u6837\u4e5f\u53ef\u4ee5\uff0c\u4f46\u662f\u8ba9\u6211\u4eec\u7a0d\u4f5c\u6539\u8fdb\uff0c\u4ee5\u4fbf\u4ee5\u548c\u5e73\u7684\u65b9\u5f0f\u7ed3\u675f\u3002<\/p>\n
    ctx<\/span>,<\/span> cancel<\/span> :=<\/span> context<\/span>.<\/span>WithCancel<\/span>(<\/span>context<\/span>.<\/span>Background<\/span>())<\/span>\r\n\r\nwg<\/span>.<\/span>Add<\/span>(<\/span>1<\/span>)<\/span>\r\ngo<\/span> func<\/span>()<\/span> {<\/span>\r\n    defer<\/span> wg<\/span>.<\/span>Done<\/span>()<\/span>\r\n\r\n    h<\/span> :=<\/span> newActionEventHandler<\/span>(<\/span>store<\/span>)<\/span>\r\n    if<\/span> err<\/span> :=<\/span> actionSource<\/span>.<\/span>ConsumeMessages<\/span>(<\/span>ctx<\/span>,<\/span> h<\/span>.<\/span>handle<\/span>);<\/span> err<\/span> !=<\/span> nil<\/span> {<\/span>\r\n        errCh<\/span> <-<\/span> errors<\/span>.<\/span>Wrap<\/span>(<\/span>err<\/span>,<\/span> \"failed to consume action event\"<\/span>)<\/span>\r\n    }<\/span>\r\n}()<\/span>\r\n\r\n...<\/span>\r\n\r\ngSrv<\/span>.<\/span>GracefulStop<\/span>()<\/span>\r\ncancel<\/span>()<\/span>\r\nwg<\/span>.<\/span>Wait<\/span>()<\/span>\r\n<\/code><\/pre>\n
    \u901a\u8fc7\u8fd9\u4e2a\u8fc7\u7a0b\uff0cgRPC\u670d\u52a1\u5668\u548cKafka\u6d88\u606f\u63a5\u6536\u8fc7\u7a0b\u5c06\u540c\u65f6\u5f00\u59cb\u8fd0\u884c\u3002<\/p>\n
    \n
    \u597d\u5427\uff0c\u6211\u4eec\u73b0\u5728\u8981\u66f4\u65b0Kubernetes\u7684\u6e05\u5355\u6587\u4ef6\u5e76\u8fdb\u884c\u8c03\u8bd5\uff0c\u4f46\u6211\u4f1a\u5077\u61d2?
    \n\u5982\u679c\u4f60\u5bf9\u6b64\u611f\u5174\u8da3\uff0c\u8bf7\u5148\u67e5\u770bGitHub\u4ed3\u5e93\u3002<\/p>\n
    \u6211\u73b0\u5728\u5df2\u7ecf\u5b9e\u73b0\u4e86\u5c06Todo\u4fdd\u5b58\u7684\u5f02\u6b65\u5904\u7406\u3002\u660e\u5929\u6211\u60f3\u8bd5\u8bd5\u7ed9Kafka\u6dfb\u52a0gRPC\u63a5\u53e3\uff0c\u8fd9\u6837\u505a\u6709\u70b9\u6709\u8da3\u5462\u3002\u90a3\u4e48\uff0c\u518d\u89c1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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