examples: added two programs doing multiplexed HTTP/2

1 files changed, 349 insertions, 0 deletions

diff --git a/docs/examples/http2-upload.c b/docs/examples/http2-upload.c
new file mode 100644
index 000000000..17197073e
--- /dev/null
+++ b/docs/examples/http2-upload.c
@@ -0,0 +1,349 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, 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 http://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.
+ *
+ ***************************************************************************/
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+
+/* somewhat unix-specific */
+#include <sys/time.h>
+#include <unistd.h>
+
+/* curl stuff */
+#include <curl/curl.h>
+
+#ifndef CURLPIPE_MULTIPLEX
+/* This little trick will just make sure that we don't enable pipelining for
+   libcurls old enough to not have this symbol. It is _not_ defined to zero in
+   a recent libcurl header. */
+#define CURLPIPE_MULTIPLEX 0
+#endif
+
+#define NUM_HANDLES 1000
+
+void *curl_hnd[NUM_HANDLES];
+int num_transfers;
+
+/* a handle to number lookup, highly ineffective when we do many
+   transfers... */
+static int hnd2num(CURL *hnd)
+{
+  int i;
+  for(i=0; i< num_transfers; i++) {
+    if(curl_hnd[i] == hnd)
+      return i;
+  }
+  return 0; /* weird, but just a fail-safe */
+}
+
+static
+void dump(const char *text, int num, unsigned char *ptr, size_t size,
+          char nohex)
+{
+  size_t i;
+  size_t c;
+  unsigned int width=0x10;
+
+  if(nohex)
+    /* without the hex output, we can fit more on screen */
+    width = 0x40;
+
+  fprintf(stderr, "%d %s, %ld bytes (0x%lx)\n",
+          num, text, (long)size, (long)size);
+
+  for(i=0; i<size; i+= width) {
+
+    fprintf(stderr, "%4.4lx: ", (long)i);
+
+    if(!nohex) {
+      /* hex not disabled, show it */
+      for(c = 0; c < width; c++)
+        if(i+c < size)
+          fprintf(stderr, "%02x ", ptr[i+c]);
+        else
+          fputs("   ", stderr);
+    }
+
+    for(c = 0; (c < width) && (i+c < size); c++) {
+      /* check for 0D0A; if found, skip past and start a new line of output */
+      if (nohex && (i+c+1 < size) && ptr[i+c]==0x0D && ptr[i+c+1]==0x0A) {
+        i+=(c+2-width);
+        break;
+      }
+      fprintf(stderr, "%c",
+              (ptr[i+c]>=0x20) && (ptr[i+c]<0x80)?ptr[i+c]:'.');
+      /* check again for 0D0A, to avoid an extra \n if it's at width */
+      if (nohex && (i+c+2 < size) && ptr[i+c+1]==0x0D && ptr[i+c+2]==0x0A) {
+        i+=(c+3-width);
+        break;
+      }
+    }
+    fputc('\n', stderr); /* newline */
+  }
+}
+
+static
+int my_trace(CURL *handle, curl_infotype type,
+             char *data, size_t size,
+             void *userp)
+{
+  char timebuf[20];
+  const char *text;
+  int num = hnd2num(handle);
+  static time_t epoch_offset;
+  static int    known_offset;
+  struct timeval tv;
+  time_t secs;
+  struct tm *now;
+
+  (void)handle; /* prevent compiler warning */
+  (void)userp;
+
+  gettimeofday(&tv, NULL);
+  if(!known_offset) {
+    epoch_offset = time(NULL) - tv.tv_sec;
+    known_offset = 1;
+  }
+  secs = epoch_offset + tv.tv_sec;
+  now = localtime(&secs);  /* not thread safe but we don't care */
+  snprintf(timebuf, sizeof(timebuf), "%02d:%02d:%02d.%06ld",
+           now->tm_hour, now->tm_min, now->tm_sec, (long)tv.tv_usec);
+
+  switch (type) {
+  case CURLINFO_TEXT:
+    fprintf(stderr, "%s [%d] Info: %s", timebuf, num, data);
+  default: /* in case a new one is introduced to shock us */
+    return 0;
+
+  case CURLINFO_HEADER_OUT:
+    text = "=> Send header";
+    break;
+  case CURLINFO_DATA_OUT:
+    text = "=> Send data";
+    break;
+  case CURLINFO_SSL_DATA_OUT:
+    text = "=> Send SSL data";
+    break;
+  case CURLINFO_HEADER_IN:
+    text = "<= Recv header";
+    break;
+  case CURLINFO_DATA_IN:
+    text = "<= Recv data";
+    break;
+  case CURLINFO_SSL_DATA_IN:
+    text = "<= Recv SSL data";
+    break;
+  }
+
+  dump(text, num, (unsigned char *)data, size, 1);
+  return 0;
+}
+
+struct input {
+  FILE *in;
+  size_t bytes_read; /* count up */
+  CURL *hnd;
+};
+
+static size_t read_callback(void *ptr, size_t size, size_t nmemb, void *userp)
+{
+  struct input *i = userp;
+  size_t retcode = fread(ptr, size, nmemb, i->in);
+  i->bytes_read += retcode;
+  return retcode;
+}
+
+struct input indata[NUM_HANDLES];
+
+static void setup(CURL *hnd, int num, const char *upload)
+{
+  FILE *out;
+  char url[256];
+  char filename[128];
+  struct stat file_info;
+  curl_off_t uploadsize;
+
+  sprintf(filename, "dl-%d", num);
+  out = fopen(filename, "wb");
+
+  sprintf(url, "https://localhost:8443/upload-%d", num);
+
+  /* get the file size of the local file */
+  stat(upload, &file_info);
+  uploadsize = file_info.st_size;
+
+  indata[num].in = fopen(upload, "rb");
+  indata[num].hnd = hnd;
+
+  /* write to this file */
+  curl_easy_setopt(hnd, CURLOPT_WRITEDATA, out);
+
+  /* we want to use our own read function */
+  curl_easy_setopt(hnd, CURLOPT_READFUNCTION, read_callback);
+  /* read from this file */
+  curl_easy_setopt(hnd, CURLOPT_READDATA, &indata[num]);
+  /* provide the size of the upload */
+  curl_easy_setopt(hnd, CURLOPT_INFILESIZE_LARGE, uploadsize);
+
+  /* send in the URL to store the upload as */
+  curl_easy_setopt(hnd, CURLOPT_URL, url);
+
+  /* upload please */
+  curl_easy_setopt(hnd, CURLOPT_UPLOAD, 1L);
+
+  /* send it verbose for max debuggaility */
+  curl_easy_setopt(hnd, CURLOPT_VERBOSE, 1L);
+  curl_easy_setopt(hnd, CURLOPT_DEBUGFUNCTION, my_trace);
+
+  /* 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);
+
+  curl_hnd[num] = hnd;
+}
+
+/*
+ * Upload all files over HTTP/2, using the same physical connection!
+ */
+int main(int argc, char **argv)
+{
+  CURL *easy[NUM_HANDLES];
+  CURLM *multi_handle;
+  int i;
+  int still_running; /* keep number of running handles */
+  const char *filename = "index.html";
+
+  if(argc > 1)
+    /* if given a number, do that many transfers */
+    num_transfers = atoi(argv[1]);
+
+  if(argc > 2)
+    /* if given a file name, upload this! */
+    filename = argv[2];
+
+  if(!num_transfers || (num_transfers > NUM_HANDLES))
+    num_transfers = 3; /* a suitable low default */
+
+  /* init a multi stack */
+  multi_handle = curl_multi_init();
+
+  for(i=0; i<num_transfers; i++) {
+    easy[i] = curl_easy_init();
+    /* set options */
+    setup(easy[i], i, filename);
+
+    /* add the individual transfer */
+    curl_multi_add_handle(multi_handle, easy[i]);
+  }
+
+  /* For now (at least) we use bit 1 in the pipelining option to switch on
+     HTTP/2 multiplexing */
+  curl_multi_setopt(multi_handle, CURLMOPT_PIPELINING, CURLPIPE_MULTIPLEX);
+
+  /* We do HTTP/2 so let's stick to one connection per host */
+  curl_multi_setopt(multi_handle, CURLMOPT_MAX_HOST_CONNECTIONS, 1L);
+
+  /* we start some action by calling perform right away */
+  curl_multi_perform(multi_handle, &still_running);
+
+  do {
+    struct timeval timeout;
+    int rc; /* select() return code */
+    CURLMcode mc; /* curl_multi_fdset() return code */
+
+    fd_set fdread;
+    fd_set fdwrite;
+    fd_set fdexcep;
+    int maxfd = -1;
+
+    long curl_timeo = -1;
+
+    FD_ZERO(&fdread);
+    FD_ZERO(&fdwrite);
+    FD_ZERO(&fdexcep);
+
+    /* set a suitable timeout to play around with */
+    timeout.tv_sec = 1;
+    timeout.tv_usec = 0;
+
+    curl_multi_timeout(multi_handle, &curl_timeo);
+    if(curl_timeo >= 0) {
+      timeout.tv_sec = curl_timeo / 1000;
+      if(timeout.tv_sec > 1)
+        timeout.tv_sec = 1;
+      else
+        timeout.tv_usec = (curl_timeo % 1000) * 1000;
+    }
+
+    /* get file descriptors from the transfers */
+    mc = curl_multi_fdset(multi_handle, &fdread, &fdwrite, &fdexcep, &maxfd);
+
+    if(mc != CURLM_OK)
+    {
+      fprintf(stderr, "curl_multi_fdset() failed, code %d.\n", mc);
+      break;
+    }
+
+    /* On success the value of maxfd is guaranteed to be >= -1. We call
+       select(maxfd + 1, ...); specially in case of (maxfd == -1) there are
+       no fds ready yet so we call select(0, ...) --or Sleep() on Windows--
+       to sleep 100ms, which is the minimum suggested value in the
+       curl_multi_fdset() doc. */
+
+    if(maxfd == -1) {
+#ifdef _WIN32
+      Sleep(100);
+      rc = 0;
+#else
+      /* Portable sleep for platforms other than Windows. */
+      struct timeval wait = { 0, 100 * 1000 }; /* 100ms */
+      rc = select(0, NULL, NULL, NULL, &wait);
+#endif
+    }
+    else {
+      /* Note that on some platforms 'timeout' may be modified by select().
+         If you need access to the original value save a copy beforehand. */
+      rc = select(maxfd+1, &fdread, &fdwrite, &fdexcep, &timeout);
+    }
+
+    switch(rc) {
+    case -1:
+      /* select error */
+      break;
+    case 0:
+    default:
+      /* timeout or readable/writable sockets */
+      curl_multi_perform(multi_handle, &still_running);
+      break;
+    }
+  } while(still_running);
+
+  curl_multi_cleanup(multi_handle);
+
+  for(i=0; i<num_transfers; i++)
+    curl_easy_cleanup(easy[i]);
+
+  return 0;
+}