nghttpx: Deprecate backend-http1-connections-per-host in favor of backend-connections-per-host

gennghttpxfun.py

@@ -126,7 +126,8 @@ OPTIONS = [
     "frontend-http2-max-concurrent-streams",
     "backend-http2-max-concurrent-streams",
     "backend-connections-per-frontend",
-    "backend-tls"
+    "backend-tls",
+    "backend-connections-per-host"
 ]
 
 LOGVARS = [

src/shrpx.cc

@@ -1356,23 +1356,24 @@ Performance:
               accepts.  Setting 0 means unlimited.
               Default: )" << get_config()->conn.upstream.worker_connections
       << R"(
-  --backend-http1-connections-per-host=<N>
-              Set   maximum  number   of  backend   concurrent  HTTP/1
-              connections per origin host.   This option is meaningful
-              when --http2-proxy  option is used.  The  origin host is
-              determined  by  authority  portion of  request  URI  (or
-              :authority  header  field  for HTTP/2).   To  limit  the
-              number of connections per frontend for default mode, use
+  --backend-connections-per-host=<N>
+              Set  maximum number  of  backend concurrent  connections
+              (and/or  streams in  case  of HTTP/2)  per origin  host.
+              This option  is meaningful when --http2-proxy  option is
+              used.   The  origin  host  is  determined  by  authority
+              portion of  request URI (or :authority  header field for
+              HTTP/2).   To  limit  the   number  of  connections  per
+              frontend        for       default        mode,       use
               --backend-connections-per-frontend.
               Default: )" << get_config()->conn.downstream.connections_per_host
       << R"(
   --backend-connections-per-frontend=<N>
-              Set maximum number of backend concurrent connections (or
-              streams in case of HTTP/2) per frontend.  This option is
-              only  used for  default  mode.  0  means unlimited.   To
-              limit   the  number   of  connections   per  host   with
-              --http2-proxy                 option,                use
-              --backend-http1-connections-per-host.
+              Set  maximum number  of  backend concurrent  connections
+              (and/or streams  in case of HTTP/2)  per frontend.  This
+              option  is   only  used  for  default   mode.   0  means
+              unlimited.  To limit the  number of connections per host
+              with          --http2-proxy         option,          use
+              --backend-connections-per-host.
               Default: )"
       << get_config()->conn.downstream.connections_per_frontend << R"(
   --rlimit-nofile=<N>
@@ -2440,6 +2441,7 @@ int main(int argc, char **argv) {
         {SHRPX_OPT_BACKEND_CONNECTIONS_PER_FRONTEND, required_argument, &flag,
          119},
         {SHRPX_OPT_BACKEND_TLS, no_argument, &flag, 120},
+        {SHRPX_OPT_BACKEND_CONNECTIONS_PER_HOST, required_argument, &flag, 121},
         {nullptr, 0, nullptr, 0}};
 
     int option_index = 0;
@@ -2954,6 +2956,10 @@ int main(int argc, char **argv) {
         // --backend-tls
         cmdcfgs.emplace_back(SHRPX_OPT_BACKEND_TLS, "yes");
         break;
+      case 121:
+        // --backend-connections-per-host
+        cmdcfgs.emplace_back(SHRPX_OPT_BACKEND_CONNECTIONS_PER_HOST, optarg);
+        break;
       default:
         break;
       }

src/shrpx_config.cc

@@ -694,6 +694,7 @@ enum {
   SHRPX_OPTID_BACKEND,
   SHRPX_OPTID_BACKEND_ADDRESS_FAMILY,
   SHRPX_OPTID_BACKEND_CONNECTIONS_PER_FRONTEND,
+  SHRPX_OPTID_BACKEND_CONNECTIONS_PER_HOST,
   SHRPX_OPTID_BACKEND_HTTP_PROXY_URI,
   SHRPX_OPTID_BACKEND_HTTP1_CONNECTIONS_PER_FRONTEND,
   SHRPX_OPTID_BACKEND_HTTP1_CONNECTIONS_PER_HOST,
@@ -1370,6 +1371,11 @@ int option_lookup_token(const char *name, size_t namelen) {
         return SHRPX_OPTID_TLS_TICKET_KEY_MEMCACHED_TLS;
       }
       break;
+    case 't':
+      if (util::strieq_l("backend-connections-per-hos", name, 27)) {
+        return SHRPX_OPTID_BACKEND_CONNECTIONS_PER_HOST;
+      }
+      break;
     }
     break;
   case 30:
@@ -2082,7 +2088,11 @@ int parse_config(const char *opt, const char *optarg,
                  "--host-rewrite option.";
 
     return 0;
-  case SHRPX_OPTID_BACKEND_HTTP1_CONNECTIONS_PER_HOST: {
+  case SHRPX_OPTID_BACKEND_HTTP1_CONNECTIONS_PER_HOST:
+    LOG(WARN) << opt
+              << ": deprecated.  Use backend-connections-per-host instead.";
+  // fall through
+  case SHRPX_OPTID_BACKEND_CONNECTIONS_PER_HOST: {
     int n;
 
     if (parse_uint(&n, opt, optarg) != 0) {

src/shrpx_config.h

@@ -235,6 +235,8 @@ constexpr char SHRPX_OPT_BACKEND_HTTP2_MAX_CONCURRENT_STREAMS[] =
 constexpr char SHRPX_OPT_BACKEND_CONNECTIONS_PER_FRONTEND[] =
     "backend-connections-per-frontend";
 constexpr char SHRPX_OPT_BACKEND_TLS[] = "backend-tls";
+constexpr char SHRPX_OPT_BACKEND_CONNECTIONS_PER_HOST[] =
+    "backend-connections-per-host";
 
 constexpr size_t SHRPX_OBFUSCATED_NODE_LENGTH = 8;