HTTP/2客户端前缀字符串丢失或损坏C客户端gRPC使用HTTPClient
HTTP/2客户端前缀字符串丢失或损坏C客户端gRPC使用HTTPClient
提问于 2021-12-10 22:44:41
我得到了"HTTP/2客户端序言字符串丢失或损坏“。
我的想法是，这与没有正确设置标头有关。它很可能是WifiClient/WifiSecureClient的实现。我已经想了好几个星期了，我被困住了。有什么建议吗？
更新:答复如下
客户机是使用纳米粒子协议缓冲编译器生成的：
protoc --plugin=protoc-gen-nanopb=~/grpc/nanopb/generator/protoc-gen-nanopb --nanopb_out=. helloworld.protoArduino客户：
DHT dht(DHTPIN, DHTTYPE);
WiFiClient client;
//WiFiClientSecure client;
void setup() {
Serial.setDebugOutput(true);
Serial.begin(115200);
delay(10);
WiFi.begin("<SSID>", "<My Password>");
delay(3000);
while (WiFi.status() != WL_CONNECTED) {
Serial.println("WIFI connection failed, reconnecting...");
delay(2000);
}
Serial.print("WiFi connected, ");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
Serial.println("Starting DHT11 sensor...");
dht.begin();
}
void loop() {
Serial.print("connecting to ");
Serial.println(addr);
// client.setInsecure();
if (!client.connect(addr, port)) {
Serial.println(addr);
Serial.println(port);
Serial.println("connection failed");
Serial.println("wait 5 sec to reconnect...");
delay(5000);
return;
}
Serial.println("reading humidity/temp...");
float hum = dht.readHumidity();
float tmp = dht.readTemperature(true);
Serial.println(hum);
Serial.println(tmp);
if (isnan(hum) || isnan(tmp)) {
Serial.println("failed to read sensor data");
delay(2000);
return;
}
float hiCel = dht.computeHeatIndex(tmp, hum, true);
helloworld_TempEvent temp = helloworld_TempEvent_init_zero;
temp.deviceId = 1;
temp.eventId = 0;
temp.humidity = hum;
temp.tempCel = tmp;
temp.heatIdxCel = hiCel;
sendTemp(temp);
delay(1000);
}
void sendTemp(helloworld_TempEvent e) {
uint8_t buffer[128];
pb_ostream_t stream = pb_ostream_from_buffer(buffer, sizeof(buffer));
if (!pb_encode(&stream, helloworld_TempEvent_fields, &e)) {
Serial.println("failed to encode temp proto");
Serial.println(PB_GET_ERROR(&stream));
return;
}
Serial.print("sending temp... ");
Serial.println(e.tempCel);
client.write(buffer, stream.bytes_written);
}服务器是使用标准的java协议缓冲区编译器生成的。我唯一改变的是添加了一个TempEvent (如下所示)。
... (helloworld template stuff) ...
// The request message containing temperatures
message TempEvent {
int32 deviceId = 1;
int32 eventId = 2;
float humidity = 3;
float tempCel = 4;
float heatIdxCel = 5;
}示例java客户端可以正常工作，不会出现任何问题。我的问题在于，简单的客户端使用的是ESP8266-01无线模块上的纳米粒子，它使用gRPC发送数据。
public class Server {
// Doesn't work
public static void main(String[] args) throws IOException, InterruptedException {
io.grpc.Server server = ServerBuilder
.forPort(8080)
.addService(new HelloServiceImpl()).build();
server.start();
server.awaitTermination();
}
// Works just fine
public static void main(String[] args) throws IOException, InterruptedException {
try (ServerSocket server = new ServerSocket(8080)) {
System.out.println("Server accepting connections on port " + server.getLocalPort());
TemperatureClient tempClient = new TemperatureClient();
while(true) {
Socket client = server.accept();
System.out.println("Client connected using remote port " + client.getPort());
final Thread t = new Thread(() -> {
try {
TempEvent p = TempEvent.parseFrom(client.getInputStream());
float i = p.getTempCel();
System.out.println("TEMP " + i);
} catch (IOException ioe) {
ioe.printStackTrace();
}
});
t.start();
}
}
}客户端能够访问服务器：
Nov 29, 2021 5:49:30 PM io.grpc.netty.shaded.io.grpc.netty.NettyServerTransport notifyTerminated
INFO: Transport failed
io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception: HTTP/2 client preface string missing or corrupt. Hex dump for received bytes: 080c10641d0000d84125e17aa0422de4459e42
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception.connectionError(Http2Exception.java:108)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.readClientPrefaceString(Http2ConnectionHandler.java:306)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.decode(Http2ConnectionHandler.java:239)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:438)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:447)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.grpc.netty.shaded.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:831)为了调试这一点，我想先看看是否可以使用grpcurl，但是我得到了以下内容：
localhost@pro ~ % grpcurl -plaintext localhost:50051 list
Failed to list services: server does not support the reflection API
localhost@pro ~ % grpcurl -insecure localhost:50051 list
Failed to dial target host "localhost:50051": tls: first record does not look like a TLS handshake我开始研究在我的实现代码中使用的WifiClient.h的实现，但是有没有人想过一种简单的方法来测试这一点而不深入研究所有的东西呢？我在想这应该非常简单..。但事实证明，要产生一个简单的客户端比我想象的要复杂得多。我觉得我好像错过了什么。
来自这里上的其他论坛：“客户端和服务器不同意。这通常是因为一个是纯文本，另一个是使用TLS。但在某些环境中，也可能是HTTP/1VS HTTP/2造成的。”
在查看Go Lang实现之后，我刚刚尝试使用WiFiClientSecure client.setInsecure()；//没有工作，十六进制转储如下所示。
17:36:33.030 [grpc-nio-worker-ELG-3-1] DEBUG io.grpc.netty.shaded.io.grpc.netty.NettyServerHandler - [id: 0x41b96938, L:/192.168.0.23:8080 - R:/192.168.0.24:61587] OUTBOUND SETTINGS: ack=false settings={MAX_CONCURRENT_STREAMS=2147483647, INITIAL_WINDOW_SIZE=1048576, MAX_HEADER_LIST_SIZE=8192}
17:36:33.031 [grpc-nio-worker-ELG-3-1] DEBUG io.grpc.netty.shaded.io.grpc.netty.NettyServerHandler - [id: 0x41b96938, L:/192.168.0.23:8080 - R:/192.168.0.24:61587] OUTBOUND WINDOW_UPDATE: streamId=0 windowSizeIncrement=983041
17:36:33.063 [grpc-nio-worker-ELG-3-1] DEBUG io.grpc.netty.shaded.io.grpc.netty.NettyServerHandler - [id: 0x41b96938, L:/192.168.0.23:8080 - R:/192.168.0.24:61587] OUTBOUND GO_AWAY: lastStreamId=2147483647 errorCode=1 length=126 bytes=485454502f3220636c69656e74207072656661636520737472696e67206d697373696e67206f7220636f72727570742e204865782064756d7020666f72207265...
17:36:33.064 [grpc-nio-worker-ELG-3-1] DEBUG io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler - [id: 0x41b96938, L:/192.168.0.23:8080 - R:/192.168.0.24:61587] Sent GOAWAY: lastStreamId '2147483647', errorCode '1', debugData 'HTTP/2 client preface string missing or corrupt. Hex dump for received bytes: 16030100d4010000d00303000000005c2f03aae7147c5f36'. Forcing shutdown of the connection.
Dec 10, 2021 5:36:33 PM io.grpc.netty.shaded.io.grpc.netty.NettyServerTransport notifyTerminated
INFO: Transport failed
io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception: HTTP/2 client preface string missing or corrupt. Hex dump for received bytes: 16030100d4010000d00303000000005c2f03aae7147c5f36
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2Exception.connectionError(Http2Exception.java:108)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.readClientPrefaceString(Http2ConnectionHandler.java:306)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler$PrefaceDecoder.decode(Http2ConnectionHandler.java:239)
at io.grpc.netty.shaded.io.netty.handler.codec.http2.Http2ConnectionHandler.decode(Http2ConnectionHandler.java:438)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:508)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:447)
at io.grpc.netty.shaded.io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379)
at io.grpc.netty.shaded.io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365)
at io.grpc.netty.shaded.io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.grpc.netty.shaded.io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.grpc.netty.shaded.io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.grpc.netty.shaded.io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.grpc.netty.shaded.io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.grpc.netty.shaded.io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:831)回答 1
Stack Overflow用户
回答已采纳
发布于 2021-12-11 06:37:52
WiFiClient client;
if (!client.connect(addr, port)) {这形成了一个基本的TCP连接。然而，gRPC是一个基于HTTP/2的复杂协议。目前，您只是在为TCP编写原始的原型消息，它可以用于通信，但这肯定不是gRPC服务器所期望的。
Nanopb本身不支持gRPC。有一个第三方工程添加了它，但它目前没有维护。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70311138
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