Support HTTP/2 protocol.

[ujjboy]

Motivation:

Support HTTP/1.1 & HTTP/2 protocol.

Modification:

• Add HTTP/1.1 server & HTTP/2 Clear text server
• Add HTTP/2 client transport.

Result:

Fix #25

[codecov-io]

Codecov Report

Merging #138 into master will increase coverage by 0.54%.
The diff coverage is 69.14%.

@@             Coverage Diff              @@
##             master     #138      +/-   ##
============================================
+ Coverage     68.03%   68.58%   +0.54%     
- Complexity      714      944     +230     
============================================
  Files           304      339      +35     
  Lines         12743    14156    +1413     
  Branches       2088     2268     +180     
============================================
+ Hits           8670     9709    +1039     
- Misses         3026     3278     +252     
- Partials       1047     1169     +122

Impacted Files	Coverage Δ	Complexity Δ
.../java/com/alipay/sofa/rpc/common/RpcConstants.java	66.66% <ø> (ø)	0 <0> (ø)	⬇️
...ootstrap/http/Http2ClearTextProviderBootstrap.java	0% <0%> (ø)	0 <0> (?)
.../sofa/rpc/transport/http/Http1ServerTransport.java	100% <100%> (ø)	1 <1> (?)
...a/com/alipay/sofa/rpc/server/http/Http1Server.java	100% <100%> (ø)	1 <1> (?)
.../transport/http/Http2ClearTextClientTransport.java	100% <100%> (ø)	1 <1> (?)
.../com/alipay/sofa/rpc/context/RpcInvokeContext.java	69.62% <100%> (+5.44%)	0 <0> (ø)	⬇️
.../sofa/rpc/transport/http/Http2ClientTransport.java	100% <100%> (ø)	1 <1> (?)
.../transport/http/Http2ClearTextServerTransport.java	100% <100%> (ø)	1 <1> (?)
...ootstrap/http/Http2ClearTextConsumerBootstrap.java	100% <100%> (ø)	2 <2> (?)
...pay/sofa/rpc/server/http/Http2ClearTextServer.java	100% <100%> (ø)	1 <1> (?)
... and 80 more

---

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[leizhiyuan]

It seems tracer is not ok
client is ok

{"timestamp":"2018-05-27 18:43:48.681","tracerId":"0a4187b11527417826069100199533","spanId":"0","span.kind":"client","local.app":"test-client","protocol":"h2c","service":"com.alipay.sofa.rpc.protobuf.ProtoService","method":"echoObj","current.thread.name":"main","invoke.type":"sync","router.record":"DIRECT","remote.ip":"127.0.0.1:12300","local.client.ip":"127.0.0.1","result.code":"00","req.serialize.time":"1206","req.size":"5","client.elapse.time":"1844","local.client.port":"54560","baggage":""}

server lost tracerId and span Id, I will check

{"timestamp":"2018-05-27 18:43:47.253","tracerId":"","spanId":"","span.kind":"server","service":"com.alipay.sofa.rpc.protobuf.ProtoService","method":"echoObj","remote.ip":"127.0.0.1","remote.app":"test-client","protocol":"h2c","local.app":"test-server","current.thread.name":"SOFA-SEV-H2C-BIZ-12300-3-T1","result.code":"00","biz.impl.time":"3","baggage":""}

[leizhiyuan]

io.netty.handler.codec.http2.HttpConversionUtil#toHttp2Headers(io.netty.handler.codec.http.HttpHeaders, io.netty.handler.codec.http2.Http2Headers)

netty convert header to lowercase. when we receive in server.

rpc_trace_context.sofaRpcId will become rpc_trace_context.sofarpcid

this is a http2 sepc. we need to get lower case key when we resolve

com.alipay.sofa.rpc.transport.http.Http2ServerChannelHandler#parseHttp2Request
 // 解析trace信息
        Map<String, String> traceMap = new HashMap<String, String>(8);
        String prefix = RemotingConstants.RPC_TRACE_NAME + ".";
        Iterator<Map.Entry<CharSequence, CharSequence>> it = headers.iterator();
        while (it.hasNext()) {
            Map.Entry<CharSequence, CharSequence> entry = it.next();
            String key = entry.getKey().toString();
            if (key.startsWith(prefix)) {
                traceMap.put(key.substring(prefix.length()), StringUtils.toString(entry.getValue()));
                // it.remove(); readonly
            }
            if (!key.startsWith(":")) {
                sofaRequest.addRequestProp(key, StringUtils.toString(entry.getValue()));
            }
        }

maybe we need hold a convert relationship to fetch ?

String http2Key=key.substring(prefix.length());
traceMap.put(transMap.get(http2Key), StringUtils.toString(entry.getValue()));

`

[ujjboy]

@leizhiyuan I have fixed it. See com.alipay.sofa.rpc.transport.http.HttpTracerUtils.

[leizhiyuan]

@ujjboy

{"timestamp":"2018-05-28 06:34:01.173","tracerId":"c0a8016c152746044116910138939","spanId":"0","span.kind":"server","service":"com.alipay.sofa.rpc.protobuf.ProtoService","method":"echoObj","remote.ip":"127.0.0.1","remote.app":"test-client","protocol":"h2c","local.app":"test-server","current.thread.name":"SOFA-SEV-H2C-BIZ-12300-3-T2","result.code":"00","biz.impl.time":"0","baggage":""}

now, tracer is ok