nghttpx: More log output when resolving addresses for better debugging

src/shrpx-unittest.cc

@@ -167,6 +167,10 @@ int main(int argc, char *argv[]) {
       !CU_add_test(pSuite, "util_get_uint64", shrpx::test_util_get_uint64) ||
       !CU_add_test(pSuite, "util_parse_config_str_list",
                    shrpx::test_util_parse_config_str_list) ||
+      !CU_add_test(pSuite, "util_make_http_hostport",
+                   shrpx::test_util_make_http_hostport) ||
+      !CU_add_test(pSuite, "util_make_hostport",
+                   shrpx::test_util_make_hostport) ||
       !CU_add_test(pSuite, "gzip_inflate", test_nghttp2_gzip_inflate) ||
       !CU_add_test(pSuite, "buffer_write", nghttp2::test_buffer_write) ||
       !CU_add_test(pSuite, "pool_recycle", nghttp2::test_pool_recycle) ||

src/shrpx.cc

@@ -656,7 +656,7 @@ int create_tcp_server_socket(UpstreamAddr &faddr,
   }
 
   faddr.fd = fd;
-  faddr.hostport = util::make_hostport(host.data(), faddr.port);
+  faddr.hostport = util::make_http_hostport(host.data(), faddr.port);
 
   LOG(NOTICE) << "Listening on " << faddr.hostport;
 
@@ -2178,8 +2178,10 @@ void process_options(
           exit(EXIT_FAILURE);
         }
 
-        LOG(INFO) << "Use UNIX domain socket path " << path
-                  << " for backend connection";
+        if (LOG_ENABLED(INFO)) {
+          LOG(INFO) << "Use UNIX domain socket path " << path
+                    << " for backend connection";
+        }
 
         addr.addr.su.un.sun_family = AF_UNIX;
         // copy path including terminal NULL
@@ -2189,44 +2191,65 @@ void process_options(
         continue;
       }
 
-      addr.hostport =
-          ImmutableString(util::make_hostport(addr.host.c_str(), addr.port));
+      addr.hostport = ImmutableString(
+          util::make_http_hostport(StringRef(addr.host), addr.port));
+
+      auto hostport = util::make_hostport(addr.host.c_str(), addr.port);
 
       if (resolve_hostname(&addr.addr, addr.host.c_str(), addr.port,
                            downstreamconf.family) == -1) {
+        LOG(FATAL) << "Resolving backend address failed: " << hostport;
         exit(EXIT_FAILURE);
       }
+      LOG(NOTICE) << "Resolved backend address: " << hostport << " -> "
+                  << util::numeric_hostport(&addr.addr.su.sa, addr.addr.len);
     }
   }
 
   auto &proxy = mod_config()->downstream_http_proxy;
   if (!proxy.host.empty()) {
-    if (LOG_ENABLED(INFO)) {
-      LOG(INFO) << "Resolving backend http proxy address";
-    }
+    auto hostport = util::make_hostport(proxy.host.c_str(), proxy.port);
     if (resolve_hostname(&proxy.addr, proxy.host.c_str(), proxy.port,
                          AF_UNSPEC) == -1) {
+      LOG(FATAL) << "Resolving backend HTTP proxy address failed: " << hostport;
       exit(EXIT_FAILURE);
     }
+    LOG(NOTICE) << "Backend HTTP proxy address: " << hostport << " -> "
+                << util::numeric_hostport(&proxy.addr.su.sa, proxy.addr.len);
   }
 
   {
     auto &memcachedconf = tlsconf.session_cache.memcached;
     if (memcachedconf.host) {
+      auto hostport =
+          util::make_hostport(memcachedconf.host.get(), memcachedconf.port);
       if (resolve_hostname(&memcachedconf.addr, memcachedconf.host.get(),
                            memcachedconf.port, memcachedconf.family) == -1) {
+        LOG(FATAL)
+            << "Resolving memcached address for TLS session cache failed: "
+            << hostport;
         exit(EXIT_FAILURE);
       }
+      LOG(NOTICE) << "Memcached address for TLS session cache: " << hostport
+                  << " -> " << util::numeric_hostport(&memcachedconf.addr.su.sa,
+                                                      memcachedconf.addr.len);
     }
   }
 
   {
     auto &memcachedconf = tlsconf.ticket.memcached;
     if (memcachedconf.host) {
+      auto hostport =
+          util::make_hostport(memcachedconf.host.get(), memcachedconf.port);
       if (resolve_hostname(&memcachedconf.addr, memcachedconf.host.get(),
                            memcachedconf.port, memcachedconf.family) == -1) {
+        LOG(FATAL) << "Resolving memcached address for TLS ticket key failed: "
+                   << hostport;
         exit(EXIT_FAILURE);
       }
+      LOG(NOTICE) << "Memcached address for TLS ticket key: " << hostport
+                  << " -> " << util::numeric_hostport(&memcachedconf.addr.su.sa,
+                                                      memcachedconf.addr.len);
     }
   }
 

src/util.cc

@@ -57,7 +57,6 @@
 #include <nghttp2/nghttp2.h>
 
 #include "timegm.h"
-#include "template.h"
 
 namespace nghttp2 {
 
@@ -1149,25 +1148,53 @@ std::string dtos(double n) {
   return utos(static_cast<int64_t>(n)) + "." + (f.size() == 1 ? "0" : "") + f;
 }
 
-std::string make_hostport(const char *host, uint16_t port) {
-  auto ipv6 = ipv6_numeric_addr(host);
-  std::string hostport;
-
-  if (ipv6) {
-    hostport += '[';
-  }
-
-  hostport += host;
-
-  if (ipv6) {
-    hostport += ']';
-  }
-
+std::string make_http_hostport(const StringRef &host, uint16_t port) {
   if (port != 80 && port != 443) {
-    hostport += ':';
-    hostport += utos(port);
+    return make_hostport(host, port);
   }
 
+  auto ipv6 = ipv6_numeric_addr(host.c_str());
+
+  std::string hostport;
+  hostport.resize(host.size() + (ipv6 ? 2 : 0));
+
+  auto p = &hostport[0];
+
+  if (ipv6) {
+    *p++ = '[';
+  }
+
+  p = std::copy_n(host.c_str(), host.size(), p);
+
+  if (ipv6) {
+    *p++ = ']';
+  }
+
+  return hostport;
+}
+
+std::string make_hostport(const StringRef &host, uint16_t port) {
+  auto ipv6 = ipv6_numeric_addr(host.c_str());
+  auto serv = utos(port);
+
+  std::string hostport;
+  hostport.resize(host.size() + (ipv6 ? 2 : 0) + 1 + serv.size());
+
+  auto p = &hostport[0];
+
+  if (ipv6) {
+    *p++ = '[';
+  }
+
+  p = std::copy_n(host.c_str(), host.size(), p);
+
+  if (ipv6) {
+    *p++ = ']';
+  }
+
+  *p++ = ':';
+  std::copy_n(serv.c_str(), serv.size(), p);
+
   return hostport;
 }
 

src/util.h

@@ -49,6 +49,8 @@
 
 #include "http-parser/http_parser.h"
 
+#include "template.h"
+
 namespace nghttp2 {
 
 // The additional HTTP/2 protocol ALPN protocol identifier we also
@@ -623,7 +625,11 @@ std::string format_duration(double t);
 // Creates "host:port" string using given |host| and |port|.  If
 // |host| is numeric IPv6 address (e.g., ::1), it is enclosed by "["
 // and "]".  If |port| is 80 or 443, port part is omitted.
-std::string make_hostport(const char *host, uint16_t port);
+std::string make_http_hostport(const StringRef &host, uint16_t port);
+
+// Just like make_http_hostport(), but doesn't treat 80 and 443
+// specially.
+std::string make_hostport(const StringRef &host, uint16_t port);
 
 // Dumps |src| of length |len| in the format similar to `hexdump -C`.
 void hexdump(FILE *out, const uint8_t *src, size_t len);

src/util_test.cc

@@ -455,4 +455,15 @@ void test_util_parse_config_str_list(void) {
   CU_ASSERT("charlie" == res[2]);
 }
 
+void test_util_make_http_hostport(void) {
+  CU_ASSERT("localhost" == util::make_http_hostport("localhost", 80));
+  CU_ASSERT("[::1]" == util::make_http_hostport("::1", 443));
+  CU_ASSERT("localhost:3000" == util::make_http_hostport("localhost", 3000));
+}
+
+void test_util_make_hostport(void) {
+  CU_ASSERT("localhost:80" == util::make_hostport("localhost", 80));
+  CU_ASSERT("[::1]:443" == util::make_hostport("::1", 443));
+}
+
 } // namespace shrpx

src/util_test.h

@@ -57,6 +57,8 @@ void test_util_parse_http_date(void);
 void test_util_localtime_date(void);
 void test_util_get_uint64(void);
 void test_util_parse_config_str_list(void);
+void test_util_make_http_hostport(void);
+void test_util_make_hostport(void);
 
 } // namespace shrpx