Update tutorial
This commit is contained in:
Tatsuhiro Tsujikawa
parent
2b465ee65f
commit
f2cd057e89
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@ -22,12 +22,10 @@ protocol over the SSL/TLS transport. In this tutorial, we use
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`nghttp2_select_next_protocol()` function to select the HTTP/2
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protocol the library supports::
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static int select_next_proto_cb(SSL* ssl,
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unsigned char **out, unsigned char *outlen,
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const unsigned char *in, unsigned int inlen,
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void *arg)
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{
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if(nghttp2_select_next_protocol(out, outlen, in, inlen) <= 0) {
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static int select_next_proto_cb(SSL *ssl _U_, unsigned char **out,
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unsigned char *outlen, const unsigned char *in,
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unsigned int inlen, void *arg _U_) {
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if (nghttp2_select_next_protocol(out, outlen, in, inlen) <= 0) {
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errx(1, "Server did not advertise " NGHTTP2_PROTO_VERSION_ID);
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}
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return SSL_TLSEXT_ERR_OK;
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@ -36,16 +34,16 @@ protocol the library supports::
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The callback is set to the SSL_CTX object using
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``SSL_CTX_set_next_proto_select_cb()`` function::
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static SSL_CTX* create_ssl_ctx(void)
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{
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static SSL_CTX *create_ssl_ctx(void) {
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SSL_CTX *ssl_ctx;
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ssl_ctx = SSL_CTX_new(SSLv23_client_method());
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if(!ssl_ctx) {
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if (!ssl_ctx) {
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errx(1, "Could not create SSL/TLS context: %s",
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ERR_error_string(ERR_get_error(), NULL));
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}
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SSL_CTX_set_options(ssl_ctx,
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SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_COMPRESSION |
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SSL_OP_ALL | SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |
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SSL_OP_NO_COMPRESSION |
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SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION);
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SSL_CTX_set_next_proto_select_cb(ssl_ctx, select_next_proto_cb, NULL);
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return ssl_ctx;
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@ -91,25 +89,22 @@ respectively.
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Then we call function ``initiate_connection()`` to start connecting to
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the remote server::
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static void initiate_connection(struct event_base *evbase,
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SSL_CTX *ssl_ctx,
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static void initiate_connection(struct event_base *evbase, SSL_CTX *ssl_ctx,
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const char *host, uint16_t port,
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http2_session_data *session_data)
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{
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http2_session_data *session_data) {
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int rv;
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struct bufferevent *bev;
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SSL *ssl;
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ssl = create_ssl(ssl_ctx);
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bev = bufferevent_openssl_socket_new(evbase, -1, ssl,
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BUFFEREVENT_SSL_CONNECTING,
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BEV_OPT_DEFER_CALLBACKS |
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BEV_OPT_CLOSE_ON_FREE);
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bev = bufferevent_openssl_socket_new(
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evbase, -1, ssl, BUFFEREVENT_SSL_CONNECTING,
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BEV_OPT_DEFER_CALLBACKS | BEV_OPT_CLOSE_ON_FREE);
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bufferevent_setcb(bev, readcb, writecb, eventcb, session_data);
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rv = bufferevent_socket_connect_hostname(bev, session_data->dnsbase,
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AF_UNSPEC, host, port);
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if(rv != 0) {
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if (rv != 0) {
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errx(1, "Could not connect to the remote host %s", host);
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}
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session_data->bev = bev;
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@ -122,10 +117,9 @@ The ``eventcb()`` is invoked by libevent event loop when an event
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(e.g., connection has been established, timeout, etc) happens on the
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underlying network socket::
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static void eventcb(struct bufferevent *bev, short events, void *ptr)
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{
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http2_session_data *session_data = (http2_session_data*)ptr;
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if(events & BEV_EVENT_CONNECTED) {
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static void eventcb(struct bufferevent *bev, short events, void *ptr) {
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http2_session_data *session_data = (http2_session_data *)ptr;
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if (events & BEV_EVENT_CONNECTED) {
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int fd = bufferevent_getfd(bev);
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int val = 1;
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fprintf(stderr, "Connected\n");
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@ -133,16 +127,16 @@ underlying network socket::
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initialize_nghttp2_session(session_data);
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send_client_connection_header(session_data);
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submit_request(session_data);
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if(session_send(session_data) != 0) {
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if (session_send(session_data) != 0) {
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delete_http2_session_data(session_data);
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}
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return;
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}
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if(events & BEV_EVENT_EOF) {
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if (events & BEV_EVENT_EOF) {
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warnx("Disconnected from the remote host");
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} else if(events & BEV_EVENT_ERROR) {
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} else if (events & BEV_EVENT_ERROR) {
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warnx("Network error");
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} else if(events & BEV_EVENT_TIMEOUT) {
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} else if (events & BEV_EVENT_TIMEOUT) {
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warnx("Timeout");
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}
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delete_http2_session_data(session_data);
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@ -154,28 +148,27 @@ event, we just simply tear down the connection. The
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finished successfully. We first initialize nghttp2 session object in
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``initialize_nghttp2_session()`` function::
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static void initialize_nghttp2_session(http2_session_data *session_data)
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{
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static void initialize_nghttp2_session(http2_session_data *session_data) {
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nghttp2_session_callbacks *callbacks;
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nghttp2_session_callbacks_new(&callbacks);
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nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
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nghttp2_session_callbacks_set_on_frame_recv_callback
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(callbacks, on_frame_recv_callback);
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nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
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on_frame_recv_callback);
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nghttp2_session_callbacks_set_on_data_chunk_recv_callback
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(callbacks, on_data_chunk_recv_callback);
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nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
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callbacks, on_data_chunk_recv_callback);
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nghttp2_session_callbacks_set_on_stream_close_callback
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(callbacks, on_stream_close_callback);
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nghttp2_session_callbacks_set_on_stream_close_callback(
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callbacks, on_stream_close_callback);
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nghttp2_session_callbacks_set_on_header_callback
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(callbacks, on_header_callback);
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nghttp2_session_callbacks_set_on_header_callback(callbacks,
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on_header_callback);
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nghttp2_session_callbacks_set_on_begin_headers_callback
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(callbacks, on_begin_headers_callback);
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nghttp2_session_callbacks_set_on_begin_headers_callback(
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callbacks, on_begin_headers_callback);
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nghttp2_session_client_new(&session_data->session, callbacks, session_data);
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@ -196,19 +189,16 @@ which is 24 bytes magic byte sequence
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transmission of client connection header is done in
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``send_client_connection_header()``::
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static void send_client_connection_header(http2_session_data *session_data)
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{
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static void send_client_connection_header(http2_session_data *session_data) {
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nghttp2_settings_entry iv[1] = {
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{ NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 }
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};
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{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100}};
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int rv;
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bufferevent_write(session_data->bev,
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NGHTTP2_CLIENT_CONNECTION_PREFACE,
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bufferevent_write(session_data->bev, NGHTTP2_CLIENT_CONNECTION_PREFACE,
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NGHTTP2_CLIENT_CONNECTION_PREFACE_LEN);
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rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE,
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iv, ARRLEN(iv));
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if(rv != 0) {
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rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE, iv,
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ARRLEN(iv));
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if (rv != 0) {
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errx(1, "Could not submit SETTINGS: %s", nghttp2_strerror(rv));
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}
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}
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@ -225,24 +215,22 @@ used, which is described about later.
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After the transmission of client connection header, we enqueue HTTP
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request in ``submit_request()`` function::
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static void submit_request(http2_session_data *session_data)
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{
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static void submit_request(http2_session_data *session_data) {
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int32_t stream_id;
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http2_stream_data *stream_data = session_data->stream_data;
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const char *uri = stream_data->uri;
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const struct http_parser_url *u = stream_data->u;
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nghttp2_nv hdrs[] = {
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MAKE_NV2(":method", "GET"),
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MAKE_NV(":scheme",
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&uri[u->field_data[UF_SCHEMA].off], u->field_data[UF_SCHEMA].len),
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MAKE_NV(":scheme", &uri[u->field_data[UF_SCHEMA].off],
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u->field_data[UF_SCHEMA].len),
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MAKE_NV(":authority", stream_data->authority, stream_data->authoritylen),
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MAKE_NV(":path", stream_data->path, stream_data->pathlen)
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};
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MAKE_NV(":path", stream_data->path, stream_data->pathlen)};
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fprintf(stderr, "Request headers:\n");
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print_headers(stderr, hdrs, ARRLEN(hdrs));
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stream_id = nghttp2_submit_request(session_data->session, NULL,
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hdrs, ARRLEN(hdrs), NULL, stream_data);
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if(stream_id < 0) {
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stream_id = nghttp2_submit_request(session_data->session, NULL, hdrs,
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ARRLEN(hdrs), NULL, stream_data);
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if (stream_id < 0) {
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errx(1, "Could not submit HTTP request: %s", nghttp2_strerror(stream_id));
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}
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@ -261,26 +249,25 @@ this request.
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The next bufferevent callback is ``readcb()``, which is invoked when
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data is available to read in the bufferevent input buffer::
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static void readcb(struct bufferevent *bev, void *ptr)
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{
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http2_session_data *session_data = (http2_session_data*)ptr;
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static void readcb(struct bufferevent *bev, void *ptr) {
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http2_session_data *session_data = (http2_session_data *)ptr;
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ssize_t readlen;
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struct evbuffer *input = bufferevent_get_input(bev);
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size_t datalen = evbuffer_get_length(input);
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unsigned char *data = evbuffer_pullup(input, -1);
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readlen = nghttp2_session_mem_recv(session_data->session, data, datalen);
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if(readlen < 0) {
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if (readlen < 0) {
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warnx("Fatal error: %s", nghttp2_strerror((int)readlen));
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delete_http2_session_data(session_data);
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return;
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}
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if(evbuffer_drain(input, readlen) != 0) {
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if (evbuffer_drain(input, readlen) != 0) {
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warnx("Fatal error: evbuffer_drain failed");
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delete_http2_session_data(session_data);
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return;
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}
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if(session_send(session_data) != 0) {
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if (session_send(session_data) != 0) {
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delete_http2_session_data(session_data);
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return;
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}
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@ -293,12 +280,11 @@ invoke nghttp2 callbacks and also queue frames. Since there may be
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pending frames, we call ``session_send()`` function to send those
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frames. The ``session_send()`` function is defined as follows::
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static int session_send(http2_session_data *session_data)
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{
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static int session_send(http2_session_data *session_data) {
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int rv;
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rv = nghttp2_session_send(session_data->session);
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if(rv != 0) {
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if (rv != 0) {
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warnx("Fatal error: %s", nghttp2_strerror(rv));
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return -1;
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}
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@ -310,11 +296,9 @@ format and call ``send_callback()`` function of type
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:type:`nghttp2_send_callback`. The ``send_callback()`` is defined as
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follows::
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static ssize_t send_callback(nghttp2_session *session,
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const uint8_t *data, size_t length,
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int flags, void *user_data)
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{
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http2_session_data *session_data = (http2_session_data*)user_data;
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static ssize_t send_callback(nghttp2_session *session _U_, const uint8_t *data,
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size_t length, int flags _U_, void *user_data) {
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http2_session_data *session_data = (http2_session_data *)user_data;
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struct bufferevent *bev = session_data->bev;
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bufferevent_write(bev, data, length);
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return length;
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@ -336,10 +320,9 @@ buffered data, see the ``send_callback()`` in the server tutorial.
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The third bufferevent callback is ``writecb()``, which is invoked when
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all data written in the bufferevent output buffer have been sent::
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static void writecb(struct bufferevent *bev, void *ptr)
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{
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http2_session_data *session_data = (http2_session_data*)ptr;
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if(nghttp2_session_want_read(session_data->session) == 0 &&
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static void writecb(struct bufferevent *bev _U_, void *ptr) {
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http2_session_data *session_data = (http2_session_data *)ptr;
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if (nghttp2_session_want_read(session_data->session) == 0 &&
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nghttp2_session_want_write(session_data->session) == 0 &&
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evbuffer_get_length(bufferevent_get_output(session_data->bev)) == 0) {
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delete_http2_session_data(session_data);
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@ -367,17 +350,15 @@ Let's describe remaining nghttp2 callbacks we setup in
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Each request header name/value pair is emitted via
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``on_header_callback`` function::
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static int on_header_callback(nghttp2_session *session,
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const nghttp2_frame *frame,
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const uint8_t *name, size_t namelen,
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const uint8_t *value, size_t valuelen,
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uint8_t flags,
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void *user_data)
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{
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http2_session_data *session_data = (http2_session_data*)user_data;
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switch(frame->hd.type) {
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static int on_header_callback(nghttp2_session *session _U_,
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const nghttp2_frame *frame, const uint8_t *name,
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size_t namelen, const uint8_t *value,
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size_t valuelen, uint8_t flags _U_,
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void *user_data) {
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http2_session_data *session_data = (http2_session_data *)user_data;
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switch (frame->hd.type) {
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case NGHTTP2_HEADERS:
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if(frame->headers.cat == NGHTTP2_HCAT_RESPONSE &&
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if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE &&
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session_data->stream_data->stream_id == frame->hd.stream_id) {
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/* Print response headers for the initiated request. */
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print_header(stderr, name, namelen, value, valuelen);
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@ -392,13 +373,12 @@ In this tutorial, we just print the name/value pair.
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After all name/value pairs are emitted for a frame,
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``on_frame_recv_callback`` function is called::
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static int on_frame_recv_callback(nghttp2_session *session,
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const nghttp2_frame *frame, void *user_data)
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{
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http2_session_data *session_data = (http2_session_data*)user_data;
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switch(frame->hd.type) {
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static int on_frame_recv_callback(nghttp2_session *session _U_,
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const nghttp2_frame *frame, void *user_data) {
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http2_session_data *session_data = (http2_session_data *)user_data;
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switch (frame->hd.type) {
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case NGHTTP2_HEADERS:
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if(frame->headers.cat == NGHTTP2_HCAT_RESPONSE &&
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if (frame->headers.cat == NGHTTP2_HCAT_RESPONSE &&
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session_data->stream_data->stream_id == frame->hd.stream_id) {
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fprintf(stderr, "All headers received\n");
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}
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@ -415,13 +395,12 @@ its stream ID.
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The ``on_data_chunk_recv_callback()`` function is invoked when a chunk
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of data is received from the remote peer::
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static int on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
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int32_t stream_id,
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static int on_data_chunk_recv_callback(nghttp2_session *session _U_,
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uint8_t flags _U_, int32_t stream_id,
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const uint8_t *data, size_t len,
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void *user_data)
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{
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http2_session_data *session_data = (http2_session_data*)user_data;
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if(session_data->stream_data->stream_id == stream_id) {
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void *user_data) {
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http2_session_data *session_data = (http2_session_data *)user_data;
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if (session_data->stream_data->stream_id == stream_id) {
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fwrite(data, len, 1, stdout);
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}
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return 0;
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@ -435,19 +414,17 @@ some binary data.
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The ``on_stream_close_callback()`` function is invoked when the stream
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is about to close::
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static int on_stream_close_callback(nghttp2_session *session,
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int32_t stream_id,
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static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
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nghttp2_error_code error_code,
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void *user_data)
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{
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http2_session_data *session_data = (http2_session_data*)user_data;
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void *user_data) {
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http2_session_data *session_data = (http2_session_data *)user_data;
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int rv;
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if(session_data->stream_data->stream_id == stream_id) {
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fprintf(stderr, "Stream %d closed with error_code=%d\n",
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stream_id, error_code);
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if (session_data->stream_data->stream_id == stream_id) {
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fprintf(stderr, "Stream %d closed with error_code=%d\n", stream_id,
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error_code);
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rv = nghttp2_session_terminate_session(session, NGHTTP2_NO_ERROR);
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if(rv != 0) {
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if (rv != 0) {
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return NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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}
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@ -29,17 +29,17 @@ time::
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static unsigned char next_proto_list[256];
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static size_t next_proto_list_len;
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static int next_proto_cb(SSL *s, const unsigned char **data, unsigned int *len,
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void *arg)
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{
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static int next_proto_cb(SSL *s _U_, const unsigned char **data,
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unsigned int *len, void *arg _U_) {
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*data = next_proto_list;
|
||||
*len = (unsigned int)next_proto_list_len;
|
||||
return SSL_TLSEXT_ERR_OK;
|
||||
}
|
||||
|
||||
static SSL_CTX* create_ssl_ctx(const char *key_file, const char *cert_file)
|
||||
{
|
||||
static SSL_CTX *create_ssl_ctx(const char *key_file, const char *cert_file) {
|
||||
SSL_CTX *ssl_ctx;
|
||||
EC_KEY *ecdh;
|
||||
|
||||
ssl_ctx = SSL_CTX_new(SSLv23_server_method());
|
||||
|
||||
...
|
||||
|
|
@ -104,8 +104,7 @@ We first create a listener object to accept incoming connections. We use
|
|||
libevent's ``struct evconnlistener`` for this purpose::
|
||||
|
||||
static void start_listen(struct event_base *evbase, const char *service,
|
||||
app_context *app_ctx)
|
||||
{
|
||||
app_context *app_ctx) {
|
||||
int rv;
|
||||
struct addrinfo hints;
|
||||
struct addrinfo *res, *rp;
|
||||
|
|
@ -116,19 +115,20 @@ libevent's ``struct evconnlistener`` for this purpose::
|
|||
hints.ai_flags = AI_PASSIVE;
|
||||
#ifdef AI_ADDRCONFIG
|
||||
hints.ai_flags |= AI_ADDRCONFIG;
|
||||
#endif // AI_ADDRCONFIG
|
||||
#endif /* AI_ADDRCONFIG */
|
||||
|
||||
rv = getaddrinfo(NULL, service, &hints, &res);
|
||||
if(rv != 0) {
|
||||
if (rv != 0) {
|
||||
errx(1, NULL);
|
||||
}
|
||||
for(rp = res; rp; rp = rp->ai_next) {
|
||||
for (rp = res; rp; rp = rp->ai_next) {
|
||||
struct evconnlistener *listener;
|
||||
listener = evconnlistener_new_bind(evbase, acceptcb, app_ctx,
|
||||
LEV_OPT_CLOSE_ON_FREE |
|
||||
LEV_OPT_REUSEABLE, -1,
|
||||
rp->ai_addr, rp->ai_addrlen);
|
||||
if(listener) {
|
||||
listener = evconnlistener_new_bind(
|
||||
evbase, acceptcb, app_ctx, LEV_OPT_CLOSE_ON_FREE | LEV_OPT_REUSEABLE,
|
||||
16, rp->ai_addr, rp->ai_addrlen);
|
||||
if (listener) {
|
||||
freeaddrinfo(res);
|
||||
|
||||
return;
|
||||
}
|
||||
}
|
||||
|
|
@ -138,10 +138,9 @@ libevent's ``struct evconnlistener`` for this purpose::
|
|||
We specify the ``acceptcb`` callback which is called when a new connection is
|
||||
accepted::
|
||||
|
||||
static void acceptcb(struct evconnlistener *listener, int fd,
|
||||
struct sockaddr *addr, int addrlen, void *arg)
|
||||
{
|
||||
app_context *app_ctx = (app_context*)arg;
|
||||
static void acceptcb(struct evconnlistener *listener _U_, int fd,
|
||||
struct sockaddr *addr, int addrlen, void *arg) {
|
||||
app_context *app_ctx = (app_context *)arg;
|
||||
http2_session_data *session_data;
|
||||
|
||||
session_data = create_http2_session_data(app_ctx, fd, addr, addrlen);
|
||||
|
|
@ -158,26 +157,25 @@ The ``eventcb()`` callback is invoked by the libevent event loop when an event
|
|||
(e.g., connection has been established, timeout, etc) happens on the
|
||||
underlying network socket::
|
||||
|
||||
static void eventcb(struct bufferevent *bev, short events, void *ptr)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)ptr;
|
||||
if(events & BEV_EVENT_CONNECTED) {
|
||||
static void eventcb(struct bufferevent *bev _U_, short events, void *ptr) {
|
||||
http2_session_data *session_data = (http2_session_data *)ptr;
|
||||
if (events & BEV_EVENT_CONNECTED) {
|
||||
fprintf(stderr, "%s connected\n", session_data->client_addr);
|
||||
|
||||
initialize_nghttp2_session(session_data);
|
||||
|
||||
if(send_server_connection_header(session_data) != 0) {
|
||||
if (send_server_connection_header(session_data) != 0) {
|
||||
delete_http2_session_data(session_data);
|
||||
return;
|
||||
}
|
||||
|
||||
return;
|
||||
}
|
||||
if(events & BEV_EVENT_EOF) {
|
||||
if (events & BEV_EVENT_EOF) {
|
||||
fprintf(stderr, "%s EOF\n", session_data->client_addr);
|
||||
} else if(events & BEV_EVENT_ERROR) {
|
||||
} else if (events & BEV_EVENT_ERROR) {
|
||||
fprintf(stderr, "%s network error\n", session_data->client_addr);
|
||||
} else if(events & BEV_EVENT_TIMEOUT) {
|
||||
} else if (events & BEV_EVENT_TIMEOUT) {
|
||||
fprintf(stderr, "%s timeout\n", session_data->client_addr);
|
||||
}
|
||||
delete_http2_session_data(session_data);
|
||||
|
|
@ -195,8 +193,7 @@ communication.
|
|||
We initialize a nghttp2 session object which is done in
|
||||
``initialize_nghttp2_session()``::
|
||||
|
||||
static void initialize_nghttp2_session(http2_session_data *session_data)
|
||||
{
|
||||
static void initialize_nghttp2_session(http2_session_data *session_data) {
|
||||
nghttp2_option *option;
|
||||
nghttp2_session_callbacks *callbacks;
|
||||
|
||||
|
|
@ -210,19 +207,17 @@ We initialize a nghttp2 session object which is done in
|
|||
|
||||
nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_frame_recv_callback
|
||||
(callbacks, on_frame_recv_callback);
|
||||
nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
|
||||
on_frame_recv_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_stream_close_callback
|
||||
(callbacks, on_stream_close_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_header_callback
|
||||
(callbacks, on_header_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_begin_headers_callback
|
||||
(callbacks, on_begin_headers_callback);
|
||||
nghttp2_session_callbacks_set_on_stream_close_callback(
|
||||
callbacks, on_stream_close_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_header_callback(callbacks,
|
||||
on_header_callback);
|
||||
|
||||
nghttp2_session_callbacks_set_on_begin_headers_callback(
|
||||
callbacks, on_begin_headers_callback);
|
||||
|
||||
nghttp2_session_server_new2(&session_data->session, callbacks, session_data,
|
||||
option);
|
||||
|
|
@ -242,16 +237,14 @@ saves some lines of application code.
|
|||
After initialization of the nghttp2 session object, we are going to send
|
||||
a server connection header in ``send_server_connection_header()``::
|
||||
|
||||
static int send_server_connection_header(http2_session_data *session_data)
|
||||
{
|
||||
static int send_server_connection_header(http2_session_data *session_data) {
|
||||
nghttp2_settings_entry iv[1] = {
|
||||
{ NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 }
|
||||
};
|
||||
{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100}};
|
||||
int rv;
|
||||
|
||||
rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE,
|
||||
iv, ARRLEN(iv));
|
||||
if(rv != 0) {
|
||||
rv = nghttp2_submit_settings(session_data->session, NGHTTP2_FLAG_NONE, iv,
|
||||
ARRLEN(iv));
|
||||
if (rv != 0) {
|
||||
warnx("Fatal error: %s", nghttp2_strerror(rv));
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -272,23 +265,22 @@ have to process them here since libevent won't invoke callback functions for
|
|||
this pending data. To process the received data, we call the
|
||||
``session_recv()`` function::
|
||||
|
||||
static int session_recv(http2_session_data *session_data)
|
||||
{
|
||||
static int session_recv(http2_session_data *session_data) {
|
||||
ssize_t readlen;
|
||||
struct evbuffer *input = bufferevent_get_input(session_data->bev);
|
||||
size_t datalen = evbuffer_get_length(input);
|
||||
unsigned char *data = evbuffer_pullup(input, -1);
|
||||
|
||||
readlen = nghttp2_session_mem_recv(session_data->session, data, datalen);
|
||||
if(readlen < 0) {
|
||||
if (readlen < 0) {
|
||||
warnx("Fatal error: %s", nghttp2_strerror((int)readlen));
|
||||
return -1;
|
||||
}
|
||||
if(evbuffer_drain(input, readlen) != 0) {
|
||||
if (evbuffer_drain(input, readlen) != 0) {
|
||||
warnx("Fatal error: evbuffer_drain failed");
|
||||
return -1;
|
||||
}
|
||||
if(session_send(session_data) != 0) {
|
||||
if (session_send(session_data) != 0) {
|
||||
return -1;
|
||||
}
|
||||
return 0;
|
||||
|
|
@ -301,11 +293,10 @@ nghttp2 callbacks and also queue outgoing frames. Since there may be pending
|
|||
outgoing frames, we call ``session_send()`` function to send off those
|
||||
frames. The ``session_send()`` function is defined as follows::
|
||||
|
||||
static int session_send(http2_session_data *session_data)
|
||||
{
|
||||
static int session_send(http2_session_data *session_data) {
|
||||
int rv;
|
||||
rv = nghttp2_session_send(session_data->session);
|
||||
if(rv != 0) {
|
||||
if (rv != 0) {
|
||||
warnx("Fatal error: %s", nghttp2_strerror(rv));
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -317,14 +308,12 @@ format and calls ``send_callback()`` of type
|
|||
:type:`nghttp2_send_callback`. The ``send_callback()`` is defined as
|
||||
follows::
|
||||
|
||||
static ssize_t send_callback(nghttp2_session *session,
|
||||
const uint8_t *data, size_t length,
|
||||
int flags, void *user_data)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)user_data;
|
||||
static ssize_t send_callback(nghttp2_session *session _U_, const uint8_t *data,
|
||||
size_t length, int flags _U_, void *user_data) {
|
||||
http2_session_data *session_data = (http2_session_data *)user_data;
|
||||
struct bufferevent *bev = session_data->bev;
|
||||
/* Avoid excessive buffering in server side. */
|
||||
if(evbuffer_get_length(bufferevent_get_output(session_data->bev)) >=
|
||||
if (evbuffer_get_length(bufferevent_get_output(session_data->bev)) >=
|
||||
OUTPUT_WOULDBLOCK_THRESHOLD) {
|
||||
return NGHTTP2_ERR_WOULDBLOCK;
|
||||
}
|
||||
|
|
@ -350,10 +339,9 @@ calling send_callback.
|
|||
The next bufferevent callback is ``readcb()``, which is invoked when
|
||||
data is available to read in the bufferevent input buffer::
|
||||
|
||||
static void readcb(struct bufferevent *bev, void *ptr)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)ptr;
|
||||
if(session_recv(session_data) != 0) {
|
||||
static void readcb(struct bufferevent *bev _U_, void *ptr) {
|
||||
http2_session_data *session_data = (http2_session_data *)ptr;
|
||||
if (session_recv(session_data) != 0) {
|
||||
delete_http2_session_data(session_data);
|
||||
return;
|
||||
}
|
||||
|
|
@ -365,18 +353,17 @@ data.
|
|||
The third bufferevent callback is ``writecb()``, which is invoked when all
|
||||
data in the bufferevent output buffer has been sent::
|
||||
|
||||
static void writecb(struct bufferevent *bev, void *ptr)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)ptr;
|
||||
if(evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
|
||||
static void writecb(struct bufferevent *bev, void *ptr) {
|
||||
http2_session_data *session_data = (http2_session_data *)ptr;
|
||||
if (evbuffer_get_length(bufferevent_get_output(bev)) > 0) {
|
||||
return;
|
||||
}
|
||||
if(nghttp2_session_want_read(session_data->session) == 0 &&
|
||||
if (nghttp2_session_want_read(session_data->session) == 0 &&
|
||||
nghttp2_session_want_write(session_data->session) == 0) {
|
||||
delete_http2_session_data(session_data);
|
||||
return;
|
||||
}
|
||||
if(session_send(session_data) != 0) {
|
||||
if (session_send(session_data) != 0) {
|
||||
delete_http2_session_data(session_data);
|
||||
return;
|
||||
}
|
||||
|
|
@ -407,12 +394,11 @@ a header block in HEADERS or PUSH_PROMISE frame is started::
|
|||
|
||||
static int on_begin_headers_callback(nghttp2_session *session,
|
||||
const nghttp2_frame *frame,
|
||||
void *user_data)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)user_data;
|
||||
void *user_data) {
|
||||
http2_session_data *session_data = (http2_session_data *)user_data;
|
||||
http2_stream_data *stream_data;
|
||||
|
||||
if(frame->hd.type != NGHTTP2_HEADERS ||
|
||||
if (frame->hd.type != NGHTTP2_HEADERS ||
|
||||
frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -436,26 +422,26 @@ emitted via ``on_header_callback`` function, which is called after
|
|||
``on_begin_headers_callback()``::
|
||||
|
||||
static int on_header_callback(nghttp2_session *session,
|
||||
const nghttp2_frame *frame,
|
||||
const uint8_t *name, size_t namelen,
|
||||
const uint8_t *value, size_t valuelen,
|
||||
void *user_data)
|
||||
{
|
||||
const nghttp2_frame *frame, const uint8_t *name,
|
||||
size_t namelen, const uint8_t *value,
|
||||
size_t valuelen, uint8_t flags _U_,
|
||||
void *user_data _U_) {
|
||||
http2_stream_data *stream_data;
|
||||
const char PATH[] = ":path";
|
||||
switch(frame->hd.type) {
|
||||
switch (frame->hd.type) {
|
||||
case NGHTTP2_HEADERS:
|
||||
if(frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
|
||||
if (frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
|
||||
break;
|
||||
}
|
||||
stream_data = nghttp2_session_get_stream_user_data(session,
|
||||
frame->hd.stream_id);
|
||||
if(!stream_data || stream_data->request_path) {
|
||||
stream_data =
|
||||
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
|
||||
if (!stream_data || stream_data->request_path) {
|
||||
break;
|
||||
}
|
||||
if(namelen == sizeof(PATH) - 1 && memcmp(PATH, name, namelen) == 0) {
|
||||
if (namelen == sizeof(PATH) - 1 && memcmp(PATH, name, namelen) == 0) {
|
||||
size_t j;
|
||||
for(j = 0; j < valuelen && value[j] != '?'; ++j);
|
||||
for (j = 0; j < valuelen && value[j] != '?'; ++j)
|
||||
;
|
||||
stream_data->request_path = percent_decode(value, j);
|
||||
}
|
||||
break;
|
||||
|
|
@ -472,20 +458,19 @@ The ``on_frame_recv_callback()`` function is invoked when a frame is
|
|||
fully received::
|
||||
|
||||
static int on_frame_recv_callback(nghttp2_session *session,
|
||||
const nghttp2_frame *frame, void *user_data)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)user_data;
|
||||
const nghttp2_frame *frame, void *user_data) {
|
||||
http2_session_data *session_data = (http2_session_data *)user_data;
|
||||
http2_stream_data *stream_data;
|
||||
switch(frame->hd.type) {
|
||||
switch (frame->hd.type) {
|
||||
case NGHTTP2_DATA:
|
||||
case NGHTTP2_HEADERS:
|
||||
/* Check that the client request has finished */
|
||||
if(frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
|
||||
stream_data = nghttp2_session_get_stream_user_data(session,
|
||||
frame->hd.stream_id);
|
||||
if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
|
||||
stream_data =
|
||||
nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
|
||||
/* For DATA and HEADERS frame, this callback may be called after
|
||||
on_stream_close_callback. Check that stream still alive. */
|
||||
if(!stream_data) {
|
||||
if (!stream_data) {
|
||||
return 0;
|
||||
}
|
||||
return on_request_recv(session, session_data, stream_data);
|
||||
|
|
@ -508,15 +493,14 @@ header.
|
|||
Sending the content of the file is done in ``send_response()`` function::
|
||||
|
||||
static int send_response(nghttp2_session *session, int32_t stream_id,
|
||||
nghttp2_nv *nva, size_t nvlen, int fd)
|
||||
{
|
||||
nghttp2_nv *nva, size_t nvlen, int fd) {
|
||||
int rv;
|
||||
nghttp2_data_provider data_prd;
|
||||
data_prd.source.fd = fd;
|
||||
data_prd.read_callback = file_read_callback;
|
||||
|
||||
rv = nghttp2_submit_response(session, stream_id, nva, nvlen, &data_prd);
|
||||
if(rv != 0) {
|
||||
if (rv != 0) {
|
||||
warnx("Fatal error: %s", nghttp2_strerror(rv));
|
||||
return -1;
|
||||
}
|
||||
|
|
@ -530,18 +514,19 @@ intended to be used as file descriptor. In this example server, we use
|
|||
the file descriptor. We also set the ``file_read_callback()`` callback
|
||||
function to read the contents of the file::
|
||||
|
||||
static ssize_t file_read_callback
|
||||
(nghttp2_session *session, int32_t stream_id,
|
||||
uint8_t *buf, size_t length, uint32_t *data_flags,
|
||||
nghttp2_data_source *source, void *user_data)
|
||||
{
|
||||
static ssize_t file_read_callback(nghttp2_session *session _U_,
|
||||
int32_t stream_id _U_, uint8_t *buf,
|
||||
size_t length, uint32_t *data_flags,
|
||||
nghttp2_data_source *source,
|
||||
void *user_data _U_) {
|
||||
int fd = source->fd;
|
||||
ssize_t r;
|
||||
while((r = read(fd, buf, length)) == -1 && errno == EINTR);
|
||||
if(r == -1) {
|
||||
while ((r = read(fd, buf, length)) == -1 && errno == EINTR)
|
||||
;
|
||||
if (r == -1) {
|
||||
return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
|
||||
}
|
||||
if(r == 0) {
|
||||
if (r == 0) {
|
||||
*data_flags |= NGHTTP2_DATA_FLAG_EOF;
|
||||
}
|
||||
return r;
|
||||
|
|
@ -559,16 +544,13 @@ remote peer.
|
|||
The ``on_stream_close_callback()`` function is invoked when the stream
|
||||
is about to close::
|
||||
|
||||
static int on_stream_close_callback(nghttp2_session *session,
|
||||
int32_t stream_id,
|
||||
nghttp2_error_code error_code,
|
||||
void *user_data)
|
||||
{
|
||||
http2_session_data *session_data = (http2_session_data*)user_data;
|
||||
static int on_stream_close_callback(nghttp2_session *session, int32_t stream_id,
|
||||
uint32_t error_code _U_, void *user_data) {
|
||||
http2_session_data *session_data = (http2_session_data *)user_data;
|
||||
http2_stream_data *stream_data;
|
||||
|
||||
stream_data = nghttp2_session_get_stream_user_data(session, stream_id);
|
||||
if(!stream_data) {
|
||||
if (!stream_data) {
|
||||
return 0;
|
||||
}
|
||||
remove_stream(session_data, stream_data);
|
||||
|
|
|
|||
Loading…
Reference in New Issue