From 8511bd0100f9dea10935a30757e830ab66ad5e2c Mon Sep 17 00:00:00 2001
From: Jaroslav Kysela <perex@perex.cz>
Date: Fri, 13 Nov 2015 09:07:08 +0100
Subject: [PATCH] httpc: add hc_pause + http_client_unpause() functionality

---
 src/http.h  |  3 +++
 src/httpc.c | 38 +++++++++++++++++++++++++++++++-------
 2 files changed, 34 insertions(+), 7 deletions(-)

diff --git a/src/http.h b/src/http.h
index d21c0edc8..57b63f381 100644
--- a/src/http.h
+++ b/src/http.h
@@ -275,6 +275,7 @@ struct http_client {
   char        *hc_bindaddr;
   tvhpoll_t   *hc_efd;
   int          hc_pevents;
+  int          hc_pevents_pause;
 
   int          hc_code;
   http_ver_t   hc_version;
@@ -316,6 +317,7 @@ struct http_client {
   int          hc_running:1;
   int          hc_shutdown_wait:1;
   int          hc_handle_location:1; /* handle the redirection (location) requests */
+  int          hc_pause:1;
 
   http_client_wcmd_t            *hc_wcmd;
   TAILQ_HEAD(,http_client_wcmd)  hc_wqueue;
@@ -375,6 +377,7 @@ int http_client_simple( http_client_t *hc, const url_t *url);
 int http_client_clear_state( http_client_t *hc );
 int http_client_run( http_client_t *hc );
 void http_client_ssl_peer_verify( http_client_t *hc, int verify );
+void http_client_unpause( http_client_t *hc );
 
 /*
  * RTSP helpers
diff --git a/src/httpc.c b/src/httpc.c
index c17f3a955..109528aed 100644
--- a/src/httpc.c
+++ b/src/httpc.c
@@ -168,19 +168,39 @@ static void
 http_client_poll_dir ( http_client_t *hc, int in, int out )
 {
   int events = (in ? TVHPOLL_IN : 0) | (out ? TVHPOLL_OUT : 0);
-  if (hc->hc_efd && hc->hc_pevents != events) {
-    tvhpoll_event_t ev;
-    memset(&ev, 0, sizeof(ev));
-    ev.fd       = hc->hc_fd;
-    ev.events   = events | TVHPOLL_IN;
-    ev.data.ptr = hc;  
-    tvhpoll_add(hc->hc_efd, &ev, 1);
+  tvhpoll_event_t ev;
+  if (hc->hc_efd) {
+    if (events == 0 && hc->hc_pause) {
+      if (hc->hc_pevents_pause == 0)
+        hc->hc_pevents_pause = hc->hc_pevents;
+      memset(&ev, 0, sizeof(ev));
+      ev.fd       = hc->hc_fd;
+      ev.data.ptr = hc;
+      tvhpoll_rem(hc->hc_efd, &ev, 1);
+    } else if (hc->hc_pevents != events) {
+      memset(&ev, 0, sizeof(ev));
+      ev.fd       = hc->hc_fd;
+      ev.events   = events | TVHPOLL_IN;
+      ev.data.ptr = hc;
+      tvhpoll_add(hc->hc_efd, &ev, 1);
+    }
   }
   hc->hc_pevents = events;
   /* make sure to se the correct errno for our SSL routines */
   errno = EAGAIN;
 }
 
+void
+http_client_unpause( http_client_t *hc )
+{
+  if (hc->hc_pause) {
+    http_client_poll_dir(hc, hc->hc_pevents_pause & TVHPOLL_IN,
+                             hc->hc_pevents_pause & TVHPOLL_OUT);
+    hc->hc_pause = 0;
+    hc->hc_pevents_pause = 0;
+  }
+}
+
 static void
 http_client_direction ( http_client_t *hc, int sending )
 {
@@ -909,6 +929,10 @@ http_client_run( http_client_t *hc )
   }
 
 retry:
+  if (hc->hc_pause) {
+    http_client_poll_dir(hc, 0, 0);
+    return HTTP_CON_RECEIVING;
+  }
   if (hc->hc_ssl)
     r = http_client_ssl_recv(hc, buf, hc->hc_io_size);
   else
-- 
2.47.3