WEBRTC for communication between agents and browsers (#14874)

* initial webrtc setup

* missing files

* rewrite of webrtc integration

* initialization and cleanup of webrtc connections

* make it compile without libdatachannel

* add missing webrtc_initialize() function when webrtc is not enabled

* make c++17 optional

* add build/m4/ax_compiler_vendor.m4

* add ax_cxx_compile_stdcxx.m4

* added new m4 files to makefile.am

* id all webrtc connections

* show warning when webrtc is disabled

* fixed message

* moved all webrtc error checking inside webrtc.cpp

* working webrtc connection establishment and cleanup

* remove obsolete code

* rewrote webrtc code in C to remove dependency for c++17

* fixed left-over reference

* detect binary and text messages

* minor fix

* naming of webrtc threads

* added webrtc configuration

* fix for thread_get_name_np()

* smaller web_client memory footprint

* universal web clients cache

* free web clients every 100 uses

* webrtc is now enabled by default only when compiled with internal checks

* webrtc responses to /api/ requests, including LZ4 compression

* fix for binary and text messages

* web_client_cache is now global

* unification of the internal web server API, for web requests, aclk request, webrtc requests

* more cleanup and unification of web client timings

* fixed compiler warnings

* update sent and received bytes

* eliminated of almost all big buffers in web client

* registry now uses the new json generation

* cookies are now an array; fixed redirects

* fix redirects, again

* write cookies directly to the header buffer, eliminating the need for cookie structures in web client

* reset the has_cookies flag

* gathered all web client cleanup to one function

* fixes redirects

* added summary.globals in /api/v2/data response

* ars to arc in /api/v2/data

* properly handle host impersonation

* set the context of mem.numa_nodes

2 files changed, 5 insertions, 5 deletions

diff --git a/streaming/rrdpush.c b/streaming/rrdpush.c
index a7e74e3d51..62b537f0c5 100644
--- a/streaming/rrdpush.c
+++ b/streaming/rrdpush.c
@@ -725,7 +725,7 @@ int rrdpush_receiver_too_busy_now(struct web_client *w) {
 }
 
 void *rrdpush_receiver_thread(void *ptr);
-int rrdpush_receiver_thread_spawn(struct web_client *w, char *url) {
+int rrdpush_receiver_thread_spawn(struct web_client *w, char *decoded_query_string) {
 
     if(!service_running(ABILITY_STREAMING_CONNECTIONS))
         return rrdpush_receiver_too_busy_now(w);
@@ -757,11 +757,11 @@ int rrdpush_receiver_thread_spawn(struct web_client *w, char *url) {
 
     // parse the parameters and fill rpt and rpt->system_info
 
-    while(url) {
-        char *value = mystrsep(&url, "&");
+    while(decoded_query_string) {
+        char *value = strsep_skip_consecutive_separators(&decoded_query_string, "&");
         if(!value || !*value) continue;
 
-        char *name = mystrsep(&value, "=");
+        char *name = strsep_skip_consecutive_separators(&value, "=");
         if(!name || !*name) continue;
         if(!value || !*value) continue;
 
diff --git a/streaming/rrdpush.h b/streaming/rrdpush.h
index 2db5dd1608..ff89584403 100644
--- a/streaming/rrdpush.h
+++ b/streaming/rrdpush.h
@@ -331,7 +331,7 @@ void rrdpush_claimed_id(RRDHOST *host);
 #define THREAD_TAG_STREAM_RECEIVER "RCVR" // "[host]" is appended
 #define THREAD_TAG_STREAM_SENDER "SNDR" // "[host]" is appended
 
-int rrdpush_receiver_thread_spawn(struct web_client *w, char *url);
+int rrdpush_receiver_thread_spawn(struct web_client *w, char *decoded_query_string);
 void rrdpush_sender_thread_stop(RRDHOST *host, const char *reason, bool wait);
 
 void rrdpush_sender_send_this_host_variable_now(RRDHOST *host, const RRDVAR_ACQUIRED *rva);