上下文
我正在实现基于Apache Camel的集成应用程序，该应用程序必须与Google Pub / Sub基础结构接口。为此，我使用了专用的Camel PubSub component，它基于Google PubSub HTTP Service API
在开发和测试阶段，我想使用PubSub Emulator，并使其在共享的DEV环境中可用，以便整个DEV团队都可以访问它。
问题
在本地主机上运行模拟器时，一切工作正常：REST HTTP API可用（例如，用于创建主题和订阅），并且Camel路由正确使用了消息。
gcloud beta emulators pubsub start --host-port=localhost:8085
API调用结果（创建主题）：
$ curl -X PUT -v http://localhost:8085/v1/projects/test-project/topics/topic-data
HTTP/1.1 200 OK
content-type: application/json
{ "name": "projects/test-project/topics/topic-data"}
但是，一旦我使用不同于-host的{{1}}参数（例如，使用我的主IP地址）启动仿真器，REST API将不再起作用，并始终返回localhost：< / p>
503 UNAVAILABLE尝试创建主题时的结果：
gcloud beta emulators pubsub start --host-port=[MY_IP_ADDRESS]:8085
我已将仿真器日志级别更改为FINEST，但是日志中没有任何内容可以解释此行为：
$ curl -X PUT -v http://[MY_IP_ADDRESS]:8085/v1/projects/test-project/topics/topic-data
HTTP/1.1 503 Service Unavailable
content-type: application/json
{"error":{"code":503,"message":"io exception","status":"UNAVAILABLE"}}
（请注意，在本地主机上运行模拟器时也会出现消息INFOS: Server started, listening on 8085
aout 16, 2019 11:43:51 AM io.netty.buffer.AbstractByteBuf <clinit>
PRECIS: -Dio.netty.buffer.checkAccessible: true
aout 16, 2019 11:43:51 AM io.netty.buffer.AbstractByteBuf <clinit>
PRECIS: -Dio.netty.buffer.checkBounds: true
aout 16, 2019 11:43:51 AM io.netty.util.ResourceLeakDetectorFactory$DefaultResourceLeakDetectorFactory newResourceLeakDetector
PRECIS: Loaded default ResourceLeakDetector: io.netty.util.ResourceLeakDetector@280b84c6
aout 16, 2019 11:43:51 AM io.gapi.emulators.grpc.GrpcServer$3 operationComplete
INFOS: Adding handler(s) to newly registered Channel.
aout 16, 2019 11:43:51 AM io.netty.handler.logging.LoggingHandler channelRegistered
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] REGISTERED
aout 16, 2019 11:43:51 AM io.netty.handler.logging.LoggingHandler channelActive
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] ACTIVE
aout 16, 2019 11:43:51 AM io.netty.util.Recycler <clinit>
PRECIS: -Dio.netty.recycler.maxCapacityPerThread: 4096
aout 16, 2019 11:43:51 AM io.netty.util.Recycler <clinit>
PRECIS: -Dio.netty.recycler.maxSharedCapacityFactor: 2
aout 16, 2019 11:43:51 AM io.netty.util.Recycler <clinit>
PRECIS: -Dio.netty.recycler.linkCapacity: 16
aout 16, 2019 11:43:51 AM io.netty.util.Recycler <clinit>
PRECIS: -Dio.netty.recycler.ratio: 8
aout 16, 2019 11:43:51 AM io.netty.handler.logging.LoggingHandler channelRead
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] READ: 285B
+-------------------------------------------------+
| 0 1 2 3 4 5 6 7 8 9 a b c d e f |
+--------+-------------------------------------------------+----------------+
|00000000| 50 55 54 20 2f 76 31 2f 70 72 6f 6a 65 63 74 73 |PUT /v1/projects|
|00000010| 2f 74 65 73 74 2d 70 72 6f 6a 65 63 74 2f 74 6f |/test-project/to|
|00000020| 70 69 63 73 2f 74 6f 70 69 63 2d 64 61 74 61 20 |pics/topic-data |
|00000030| 48 54 54 50 2f 31 2e 31 0d 0a 55 73 65 72 2d 41 |HTTP/1.1..User-A|
|00000040| 67 65 6e 74 3a 20 50 6f 73 74 6d 61 6e 52 75 6e |gent: PostmanRun|
|00000050| 74 69 6d 65 2f 37 2e 31 35 2e 32 0d 0a 41 63 63 |time/7.15.2..Acc|
|00000060| 65 70 74 3a 20 2a 2f 2a 0d 0a 43 61 63 68 65 2d |ept: */*..Cache-|
|00000070| 43 6f 6e 74 72 6f 6c 3a 20 6e 6f 2d 63 61 63 68 |Control: no-cach|
|00000080| 65 0d 0a 50 6f 73 74 6d 61 6e 2d 54 6f 6b 65 6e |e..Postman-Token|
|00000090| 3a 20 66 31 61 38 33 63 35 36 2d 36 66 38 66 2d |: f1a83c56-6f8f-|
|000000a0| 34 65 35 32 2d 38 64 35 35 2d 64 64 66 66 64 37 |4e52-8d55-ddffd7|
|000000b0| 37 38 66 64 36 65 0d 0a 48 6f 73 74 3a 20 31 30 |78fd6e..Host: a.|
|000000c0| 2e 32 2e 34 31 2e 31 39 32 3a 38 30 38 35 0d 0a |.b.c.d:8085.....|
|000000d0| 41 63 63 65 70 74 2d 45 6e 63 6f 64 69 6e 67 3a |Accept-Encoding:|
|000000e0| 20 67 7a 69 70 2c 20 64 65 66 6c 61 74 65 0d 0a | gzip, deflate..|
|000000f0| 43 6f 6e 74 65 6e 74 2d 4c 65 6e 67 74 68 3a 20 |Content-Length: |
|00000100| 30 0d 0a 43 6f 6e 6e 65 63 74 69 6f 6e 3a 20 6b |0..Connection: k|
|00000110| 65 65 70 2d 61 6c 69 76 65 0d 0a 0d 0a |eep-alive.... |
+--------+-------------------------------------------------+----------------+
aout 16, 2019 11:43:51 AM io.gapi.emulators.netty.HttpVersionRoutingHandler channelRead
INFOS: Detected non-HTTP/2 connection.
aout 16, 2019 11:43:51 AM io.netty.handler.logging.LoggingHandler channelReadComplete
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] READ COMPLETE
aout 16, 2019 11:43:51 AM io.grpc.Context createStorage
PRECIS: Storage override doesn't exist. Using default
java.lang.ClassNotFoundException: io.grpc.override.ContextStorageOverride
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:264)
at io.grpc.Context.createStorage(Context.java:137)
at io.grpc.Context.storage(Context.java:129)
at io.grpc.Context.current(Context.java:181)
at io.grpc.Context$Key.get(Context.java:891)
at io.grpc.internal.CensusTracingModule$TracingClientInterceptor.interceptCall(CensusTracingModule.java:385)
at io.grpc.ClientInterceptors$InterceptorChannel.newCall(ClientInterceptors.java:156)
at io.grpc.internal.CensusStatsModule$StatsClientInterceptor.interceptCall(CensusStatsModule.java:691)
at io.grpc.ClientInterceptors$InterceptorChannel.newCall(ClientInterceptors.java:156)
at io.grpc.internal.ManagedChannelImpl.newCall(ManagedChannelImpl.java:819)
at io.grpc.internal.ForwardingManagedChannel.newCall(ForwardingManagedChannel.java:63)
at io.grpc.stub.MetadataUtils$HeaderAttachingClientInterceptor.interceptCall(MetadataUtils.java:74)
at io.grpc.ClientInterceptors$InterceptorChannel.newCall(ClientInterceptors.java:156)
at com.google.pubsub.v1.PublisherGrpc$PublisherStub.createTopic(PublisherGrpc.java:673)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at io.gapi.emulators.grpc.ProtoReflectionUtil.invoke(ProtoReflectionUtil.java:159)
at io.gapi.emulators.grpc.HttpAdapter$UnaryMethodHandler.handle(HttpAdapter.java:531)
at io.gapi.emulators.grpc.HttpAdapter.handleRequest(HttpAdapter.java:165)
at io.gapi.emulators.netty.HttpHandler.channelRead(HttpHandler.java:52)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)
at io.netty.handler.codec.MessageToMessageDecoder.channelRead(MessageToMessageDecoder.java:102)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:345)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:337)
at io.netty.handler.codec.ByteToMessageDecoder.fireChannelRead(ByteToMessageDecoder.java:323)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:297)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:359)
at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:38)
at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:350)
at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:163)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:404)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:495)
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:905)
at java.lang.Thread.run(Thread.java:748)
aout 16, 2019 11:43:51 AM io.netty.handler.logging.LoggingHandler flush
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] FLUSH
aout 16, 2019 11:43:51 AM io.grpc.internal.DnsNameResolver$Resolve resolveInternal
PRECIS: No TXT records found for localhost
aout 16, 2019 11:43:53 AM io.gapi.emulators.netty.HttpHandler$1 onError
INFOS: Exception when handling request: UNAVAILABLE: io exception
aout 16, 2019 11:43:53 AM io.netty.handler.logging.LoggingHandler write
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] WRITE: 158B
+-------------------------------------------------+
| 0 1 2 3 4 5 6 7 8 9 a b c d e f |
+--------+-------------------------------------------------+----------------+
|00000000| 48 54 54 50 2f 31 2e 31 20 35 30 33 20 53 65 72 |HTTP/1.1 503 Ser|
|00000010| 76 69 63 65 20 55 6e 61 76 61 69 6c 61 62 6c 65 |vice Unavailable|
|00000020| 0d 0a 63 6f 6e 74 65 6e 74 2d 74 79 70 65 3a 20 |..content-type: |
|00000030| 61 70 70 6c 69 63 61 74 69 6f 6e 2f 6a 73 6f 6e |application/json|
|00000040| 0d 0a 63 6f 6e 74 65 6e 74 2d 6c 65 6e 67 74 68 |..content-length|
|00000050| 3a 20 37 30 0d 0a 0d 0a 7b 22 65 72 72 6f 72 22 |: 70....{"error"|
|00000060| 3a 7b 22 63 6f 64 65 22 3a 35 30 33 2c 22 6d 65 |:{"code":503,"me|
|00000070| 73 73 61 67 65 22 3a 22 69 6f 20 65 78 63 65 70 |ssage":"io excep|
|00000080| 74 69 6f 6e 22 2c 22 73 74 61 74 75 73 22 3a 22 |tion","status":"|
|00000090| 55 4e 41 56 41 49 4c 41 42 4c 45 22 7d 7d |UNAVAILABLE"}} |
+--------+-------------------------------------------------+----------------+
aout 16, 2019 11:43:53 AM io.netty.handler.logging.LoggingHandler flush
PRECIS: [id: 0x369f8b68, L:/a.b.c.d:8085 - R:/a.b.c.d:49246] FLUSH
，所以我不确定是否可能是此原因）
注意，gRPC API在两种情况下（本地主机和特定IP地址）都可以正常工作，但是很遗憾，我无法使用此协议，因为Camel PubSub组件不支持该协议。
答案 0 :(得分：0)
我认为我过去也遇到过同样的问题，不同之处在于我做的事情有所不同，但是每当我在url中使用ip时，url就无法访问。
有些时候，当我们使用本地系统时，您将不得不调整防火墙以使您的请求通过。对我来说，它就像是一种魅力。我承认我所做的只是禁用防火墙，但目前安全性对我而言并不那么重要。
希望这会有所帮助。如果您发现是否还有其他问题，请发表文章，对此我感到很好奇，因为我必须经常使用pubsub服务。
谢谢。