Add http2.

TODO: 1. socket management 2. window mechanism

src/brpc/http_header.cpp

@@ -24,7 +24,9 @@ namespace brpc {
 HttpHeader::HttpHeader() 
     : _status_code(HTTP_STATUS_OK)
     , _method(HTTP_METHOD_GET)
-    , _version(1, 1) {
+    , _version(1, 1)
+    , _h2_stream_id(0)
+    , _h2_error(H2_NO_ERROR) {
     // NOTE: don't forget to clear the field in Clear() as well.
 }
 
@@ -48,6 +50,8 @@ void HttpHeader::Swap(HttpHeader &rhs) {
     _content_type.swap(rhs._content_type);
     _unresolved_path.swap(rhs._unresolved_path);
     std::swap(_version, rhs._version);
+    std::swap(_h2_stream_id, rhs._h2_stream_id);
+    std::swap(_h2_error, rhs._h2_error);
 }
 
 void HttpHeader::Clear() {
@@ -58,6 +62,8 @@ void HttpHeader::Clear() {
     _content_type.clear();
     _unresolved_path.clear();
     _version = std::make_pair(1, 1);
+    _h2_stream_id = 0;
+    _h2_error = H2_NO_ERROR;
 }
 
 const char* HttpHeader::reason_phrase() const {

src/brpc/http_header.h

@@ -63,6 +63,12 @@ public:
     // True if the message is from HTTP2.
     bool is_http2() const { return major_version() == 2; }
 
+    // Id of the HTTP2 stream where the message is from.
+    // 0 when is_http2() is false.
+    int h2_stream_id() const { return _h2_stream_id; }
+
+    H2Error h2_error() const { return _h2_error; }
+
     // Get/set "Content-Type". Notice that you can't get "Content-Type"
     // via GetHeader().
     // possible values: "text/plain", "application/json" ...
@@ -154,6 +160,8 @@ friend void policy::ProcessHttpRequest(InputMessageBase *msg);
     std::string _content_type;
     std::string _unresolved_path;
     std::pair<int, int> _version;
+    int _h2_stream_id;
+    H2Error _h2_error;
 };
 
 const HttpHeader& DefaultHttpHeader();

src/brpc/options.proto.rej

+diff a/src/brpc/options.proto b/src/brpc/options.proto	(rejected hunks)
+@@ -53,6 +53,7 @@ enum ProtocolType {
+     // Reserve special protocol for cds-agent, which depends on FIFO right now
+     PROTOCOL_CDS_AGENT = 23;           // Client side only
+     PROTOCOL_ESP = 24;           // Client side only
++    PROTOCOL_HTTP2 = 25;
+ }
+ 
+ message ChunkInfo {

src/brpc/server.h

@@ -53,8 +53,7 @@ class RtmpService;
 class SocketSSLContext;
 
 struct ServerOptions {
-    // Constructed with default options.
-    ServerOptions();
+    ServerOptions();  // Constructed with default options.
         
     // connections without data transmission for so many seconds will be closed
     // Default: -1 (disabled)