aboutsummaryrefslogtreecommitdiff
path: root/docs
diff options
context:
space:
mode:
Diffstat (limited to 'docs')
-rw-r--r--docs/examples/Makefile.inc2
-rw-r--r--docs/examples/http2-pushinmemory.c188
2 files changed, 189 insertions, 1 deletions
diff --git a/docs/examples/Makefile.inc b/docs/examples/Makefile.inc
index 72eb0d4b8..206a89237 100644
--- a/docs/examples/Makefile.inc
+++ b/docs/examples/Makefile.inc
@@ -34,7 +34,7 @@ check_PROGRAMS = 10-at-a-time anyauthput cookie_interface debug fileupload \
imap-tls imap-multi url2file sftpget ftpsget postinmemory http2-download \
http2-upload http2-serverpush getredirect ftpuploadfrommem \
ftpuploadresume sslbackend postit2-formadd multi-formadd \
- shared-connection-cache sftpuploadresume
+ shared-connection-cache sftpuploadresume http2-pushinmemory
# These examples require external dependencies that may not be commonly
# available on POSIX systems, so don't bother attempting to compile them here.
diff --git a/docs/examples/http2-pushinmemory.c b/docs/examples/http2-pushinmemory.c
new file mode 100644
index 000000000..00406a8a5
--- /dev/null
+++ b/docs/examples/http2-pushinmemory.c
@@ -0,0 +1,188 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2018, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at https://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+/* <DESC>
+ * HTTP/2 server push. Receive all data in memory.
+ * </DESC>
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+struct Memory {
+ char *memory;
+ size_t size;
+};
+
+static size_t
+write_cb(void *contents, size_t size, size_t nmemb, void *userp)
+{
+ size_t realsize = size * nmemb;
+ struct Memory *mem = (struct Memory *)userp;
+ char *ptr = realloc(mem->memory, mem->size + realsize + 1);
+ if(!ptr) {
+ /* out of memory! */
+ printf("not enough memory (realloc returned NULL)\n");
+ return 0;
+ }
+
+ mem->memory = ptr;
+ memcpy(&(mem->memory[mem->size]), contents, realsize);
+ mem->size += realsize;
+ mem->memory[mem->size] = 0;
+
+ return realsize;
+}
+
+#define MAX_FILES 10
+static struct Memory files[MAX_FILES];
+static int pushindex = 1;
+
+static void init_memory(struct Memory *chunk)
+{
+ chunk->memory = malloc(1); /* grown as needed with realloc */
+ chunk->size = 0; /* no data at this point */
+}
+
+static void setup(CURL *hnd)
+{
+ /* set the same URL */
+ curl_easy_setopt(hnd, CURLOPT_URL, "https://localhost:8443/index.html");
+
+ /* HTTP/2 please */
+ curl_easy_setopt(hnd, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_2_0);
+
+ /* we use a self-signed test server, skip verification during debugging */
+ curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYPEER, 0L);
+ curl_easy_setopt(hnd, CURLOPT_SSL_VERIFYHOST, 0L);
+
+ /* write data to a struct */
+ curl_easy_setopt(hnd, CURLOPT_WRITEFUNCTION, write_cb);
+ init_memory(&files[0]);
+ curl_easy_setopt(hnd, CURLOPT_WRITEDATA, &files[0]);
+
+ /* wait for pipe connection to confirm */
+ curl_easy_setopt(hnd, CURLOPT_PIPEWAIT, 1L);
+}
+
+/* called when there's an incoming push */
+static int server_push_callback(CURL *parent,
+ CURL *easy,
+ size_t num_headers,
+ struct curl_pushheaders *headers,
+ void *userp)
+{
+ char *headp;
+ int *transfers = (int *)userp;
+ (void)parent; /* we have no use for this */
+ (void)num_headers; /* unused */
+
+ if(pushindex == MAX_FILES)
+ /* can't fit anymore */
+ return CURL_PUSH_DENY;
+
+ /* write to this buffer */
+ init_memory(&files[pushindex]);
+ curl_easy_setopt(easy, CURLOPT_WRITEDATA, &files[pushindex]);
+ pushindex++;
+
+ headp = curl_pushheader_byname(headers, ":path");
+ if(headp)
+ fprintf(stderr, "* Pushed :path '%s'\n", headp /* skip :path + colon */);
+
+ (*transfers)++; /* one more */
+ return CURL_PUSH_OK;
+}
+
+
+/*
+ * Download a file over HTTP/2, take care of server push.
+ */
+int main(void)
+{
+ CURL *easy;
+ CURLM *multi;
+ int still_running; /* keep number of running handles */
+ int transfers = 1; /* we start with one */
+ int i;
+ struct CURLMsg *m;
+
+ /* init a multi stack */
+ multi = curl_multi_init();
+
+ easy = curl_easy_init();
+
+ /* set options */
+ setup(easy);
+
+ /* add the easy transfer */
+ curl_multi_add_handle(multi, easy);
+
+ curl_multi_setopt(multi, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
+ curl_multi_setopt(multi, CURLMOPT_PUSHFUNCTION, server_push_callback);
+ curl_multi_setopt(multi, CURLMOPT_PUSHDATA, &transfers);
+
+ while(transfers) {
+ int rc;
+ CURLMcode mcode = curl_multi_perform(multi, &still_running);
+ if(mcode)
+ break;
+
+ mcode = curl_multi_wait(multi, NULL, 0, 1000, &rc);
+ if(mcode)
+ break;
+
+
+ /*
+ * When doing server push, libcurl itself created and added one or more
+ * easy handles but *we* need to clean them up when they are done.
+ */
+ do {
+ int msgq = 0;;
+ m = curl_multi_info_read(multi, &msgq);
+ if(m && (m->msg == CURLMSG_DONE)) {
+ CURL *e = m->easy_handle;
+ transfers--;
+ curl_multi_remove_handle(multi, e);
+ curl_easy_cleanup(e);
+ }
+ } while(m);
+
+ }
+
+
+ curl_multi_cleanup(multi);
+
+ /* 'pushindex' is now the number of received transfers */
+ for(i = 0; i < pushindex; i++) {
+ /* do something fun with the data, and then free it when done */
+ free(files[i].memory);
+ }
+
+ return 0;
+}