Adding upstream version 2.4.57.upstream/2.4.57

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 133 insertions, 0 deletions

diff --git a/modules/http2/h2_proxy_session.h b/modules/http2/h2_proxy_session.h
new file mode 100644
index 0000000..f40e5ee
--- /dev/null
+++ b/modules/http2/h2_proxy_session.h
@@ -0,0 +1,133 @@
+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef h2_proxy_session_h
+#define h2_proxy_session_h
+
+#define H2_ALEN(a)          (sizeof(a)/sizeof((a)[0]))
+
+#include <nghttp2/nghttp2.h>
+
+struct h2_proxy_iqueue;
+struct h2_proxy_ihash_t;
+
+typedef enum {
+    H2_STREAM_ST_IDLE,
+    H2_STREAM_ST_OPEN,
+    H2_STREAM_ST_RESV_LOCAL,
+    H2_STREAM_ST_RESV_REMOTE,
+    H2_STREAM_ST_CLOSED_INPUT,
+    H2_STREAM_ST_CLOSED_OUTPUT,
+    H2_STREAM_ST_CLOSED,
+} h2_proxy_stream_state_t;
+
+typedef enum {
+    H2_PROXYS_ST_INIT,             /* send initial SETTINGS, etc. */
+    H2_PROXYS_ST_DONE,             /* finished, connection close */
+    H2_PROXYS_ST_IDLE,             /* no streams to process */
+    H2_PROXYS_ST_BUSY,             /* read/write without stop */
+    H2_PROXYS_ST_WAIT,             /* waiting for tasks reporting back */
+    H2_PROXYS_ST_LOCAL_SHUTDOWN,   /* we announced GOAWAY */
+    H2_PROXYS_ST_REMOTE_SHUTDOWN,  /* client announced GOAWAY */
+} h2_proxys_state;
+
+typedef enum {
+    H2_PROXYS_EV_INIT,             /* session was initialized */
+    H2_PROXYS_EV_LOCAL_GOAWAY,     /* we send a GOAWAY */
+    H2_PROXYS_EV_REMOTE_GOAWAY,    /* remote send us a GOAWAY */
+    H2_PROXYS_EV_CONN_ERROR,       /* connection error */
+    H2_PROXYS_EV_PROTO_ERROR,      /* protocol error */
+    H2_PROXYS_EV_CONN_TIMEOUT,     /* connection timeout */
+    H2_PROXYS_EV_NO_IO,            /* nothing has been read or written */
+    H2_PROXYS_EV_STREAM_SUBMITTED, /* stream has been submitted */
+    H2_PROXYS_EV_STREAM_DONE,      /* stream has been finished */
+    H2_PROXYS_EV_STREAM_RESUMED,   /* stream signalled availability of headers/data */
+    H2_PROXYS_EV_DATA_READ,        /* connection data has been read */
+    H2_PROXYS_EV_NGH2_DONE,        /* nghttp2 wants neither read nor write anything */
+    H2_PROXYS_EV_PRE_CLOSE,        /* connection will close after this */
+} h2_proxys_event_t;
+
+typedef enum {
+    H2_PING_ST_NONE,               /* normal connection mode, ProxyTimeout rules */
+    H2_PING_ST_AWAIT_ANY,          /* waiting for any frame from backend */
+    H2_PING_ST_AWAIT_PING,         /* waiting for PING frame from backend */
+} h2_ping_state_t;
+
+typedef struct h2_proxy_session h2_proxy_session;
+typedef void h2_proxy_request_done(h2_proxy_session *s, request_rec *r,
+                                   apr_status_t status, int touched);
+
+struct h2_proxy_session {
+    const char *id;
+    conn_rec *c;
+    proxy_conn_rec *p_conn;
+    proxy_server_conf *conf;
+    apr_pool_t *pool;
+    nghttp2_session *ngh2;   /* the nghttp2 session itself */
+    
+    unsigned int aborted : 1;
+    unsigned int h2_front : 1; /* if front-end connection is HTTP/2 */
+
+    h2_proxy_request_done *done;
+    void *user_data;
+    
+    unsigned char window_bits_stream;
+    unsigned char window_bits_connection;
+
+    h2_proxys_state state;
+    apr_interval_time_t wait_timeout;
+
+    struct h2_proxy_ihash_t *streams;
+    struct h2_proxy_iqueue *suspended;
+    apr_size_t remote_max_concurrent;
+    int last_stream_id;     /* last stream id processed by backend, or 0 */
+    apr_time_t last_frame_received;
+    
+    apr_bucket_brigade *input;
+    apr_bucket_brigade *output;
+
+    h2_ping_state_t ping_state;
+    apr_time_t ping_timeout;
+    apr_time_t save_timeout;
+};
+
+h2_proxy_session *h2_proxy_session_setup(const char *id, proxy_conn_rec *p_conn,
+                                         proxy_server_conf *conf,
+                                         int h2_front, 
+                                         unsigned char window_bits_connection,
+                                         unsigned char window_bits_stream,
+                                         h2_proxy_request_done *done);
+
+apr_status_t h2_proxy_session_submit(h2_proxy_session *s, const char *url,
+                                     request_rec *r, int standalone);
+                       
+/** 
+ * Perform a step in processing the proxy session. Will return aftert
+ * one read/write cycle and indicate session status by status code.
+ * @param s the session to process
+ * @return APR_EAGAIN  when processing needs to be invoked again
+ *         APR_SUCCESS when all streams have been processed, session still live
+ *         APR_EOF     when the session has been terminated
+ */
+apr_status_t h2_proxy_session_process(h2_proxy_session *s);
+
+void h2_proxy_session_cancel_all(h2_proxy_session *s);
+
+void h2_proxy_session_cleanup(h2_proxy_session *s, h2_proxy_request_done *done);
+
+#define H2_PROXY_REQ_URL_NOTE   "h2-proxy-req-url"
+
+#endif /* h2_proxy_session_h */