nghttpx: Use ImmutableString to store memcached server host

src/shrpx.cc

@@ -2220,10 +2220,10 @@ void process_options(
 
   {
     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(),
+    if (!memcachedconf.host.empty()) {
+      auto hostport = util::make_hostport(StringRef{memcachedconf.host},
+                                          memcachedconf.port);
+      if (resolve_hostname(&memcachedconf.addr, memcachedconf.host.c_str(),
                            memcachedconf.port, memcachedconf.family) == -1) {
         LOG(FATAL)
             << "Resolving memcached address for TLS session cache failed: "
@@ -2238,10 +2238,10 @@ void process_options(
 
   {
     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(),
+    if (!memcachedconf.host.empty()) {
+      auto hostport = util::make_hostport(StringRef{memcachedconf.host},
+                                          memcachedconf.port);
+      if (resolve_hostname(&memcachedconf.addr, memcachedconf.host.c_str(),
                            memcachedconf.port, memcachedconf.family) == -1) {
         LOG(FATAL) << "Resolving memcached address for TLS ticket key failed: "
                    << hostport;

src/shrpx_config.cc

@@ -2154,7 +2154,7 @@ int parse_config(const char *opt, const char *optarg,
     }
 
     auto &memcachedconf = mod_config()->tls.session_cache.memcached;
-    memcachedconf.host = strcopy(host);
+    memcachedconf.host = host;
     memcachedconf.port = port;
 
     return 0;
@@ -2166,7 +2166,7 @@ int parse_config(const char *opt, const char *optarg,
     }
 
     auto &memcachedconf = mod_config()->tls.ticket.memcached;
-    memcachedconf.host = strcopy(host);
+    memcachedconf.host = host;
     memcachedconf.port = port;
 
     return 0;

src/shrpx_config.h

@@ -343,7 +343,9 @@ struct TLSConfig {
     struct {
       Address addr;
       uint16_t port;
-      std::unique_ptr<char[]> host;
+      // Hostname of memcached server.  This is also used as SNI field
+      // if TLS is enabled.
+      ImmutableString host;
       // Client private key and certificate for authentication
       ImmutableString private_key_file;
       ImmutableString cert_file;
@@ -370,7 +372,9 @@ struct TLSConfig {
     struct {
       Address addr;
       uint16_t port;
-      std::unique_ptr<char[]> host;
+      // Hostname of memcached server.  This is also used as SNI field
+      // if TLS is enabled.
+      ImmutableString host;
       // Client private key and certificate for authentication
       ImmutableString private_key_file;
       ImmutableString cert_file;

src/shrpx_ssl.cc

@@ -485,7 +485,7 @@ SSL_CTX *create_ssl_context(const char *private_key_file, const char *cert_file
   SSL_CTX_set_session_id_context(ssl_ctx, sid_ctx, sizeof(sid_ctx) - 1);
   SSL_CTX_set_session_cache_mode(ssl_ctx, SSL_SESS_CACHE_SERVER);
 
-  if (tlsconf.session_cache.memcached.host) {
+  if (!tlsconf.session_cache.memcached.host.empty()) {
     SSL_CTX_sess_set_new_cb(ssl_ctx, tls_session_new_cb);
     SSL_CTX_sess_set_get_cb(ssl_ctx, tls_session_get_cb);
   }

src/shrpx_worker.cc

@@ -91,11 +91,11 @@ Worker::Worker(struct ev_loop *loop, SSL_CTX *sv_ssl_ctx, SSL_CTX *cl_ssl_ctx,
 
   auto &session_cacheconf = get_config()->tls.session_cache;
 
-  if (session_cacheconf.memcached.host) {
+  if (!session_cacheconf.memcached.host.empty()) {
     session_cache_memcached_dispatcher_ = make_unique<MemcachedDispatcher>(
         &session_cacheconf.memcached.addr, loop,
         tls_session_cache_memcached_ssl_ctx,
-        session_cacheconf.memcached.host.get(), &mcpool_);
+        StringRef{session_cacheconf.memcached.host}, &mcpool_);
   }
 
   auto &downstreamconf = get_config()->conn.downstream;

src/shrpx_worker_process.cc

@@ -427,7 +427,7 @@ int worker_process_event_loop(WorkerProcessConfig *wpconf) {
     auto &ticketconf = get_config()->tls.ticket;
     auto &memcachedconf = ticketconf.memcached;
 
-    if (ticketconf.memcached.host) {
+    if (!memcachedconf.host.empty()) {
       SSL_CTX *ssl_ctx = nullptr;
 
       if (memcachedconf.tls) {
@@ -437,7 +437,7 @@ int worker_process_event_loop(WorkerProcessConfig *wpconf) {
       conn_handler.set_tls_ticket_key_memcached_dispatcher(
           make_unique<MemcachedDispatcher>(
               &ticketconf.memcached.addr, loop, ssl_ctx,
-              StringRef(memcachedconf.host.get()), &mcpool));
+              StringRef{memcachedconf.host}, &mcpool));
 
       ev_timer_init(&renew_ticket_key_timer, memcached_get_ticket_key_cb, 0.,
                     0.);