src: Rename our new string classes

src/http2.h

@@ -152,7 +152,7 @@ nghttp2_nv make_nv_ls_nocopy(const char(&name)[N], const std::string &value) {
 }
 
 template <size_t N>
-nghttp2_nv make_nv_ls_nocopy(const char(&name)[N], const StringAdaptor &value) {
+nghttp2_nv make_nv_ls_nocopy(const char(&name)[N], const StringRef &value) {
   return {(uint8_t *)name, (uint8_t *)value.c_str(), N - 1, value.size(),
           NGHTTP2_NV_FLAG_NO_COPY_NAME | NGHTTP2_NV_FLAG_NO_COPY_VALUE};
 }

src/shrpx.cc

@@ -2474,7 +2474,7 @@ int main(int argc, char **argv) {
 
   if (get_config()->downstream_addr_groups.empty()) {
     DownstreamAddr addr;
-    addr.host = VString(DEFAULT_DOWNSTREAM_HOST);
+    addr.host = ImmutableString::from_lit(DEFAULT_DOWNSTREAM_HOST);
     addr.port = DEFAULT_DOWNSTREAM_PORT;
 
     DownstreamAddrGroup g("/");
@@ -2536,8 +2536,8 @@ int main(int argc, char **argv) {
         // for AF_UNIX socket, we use "localhost" as host for backend
         // hostport.  This is used as Host header field to backend and
         // not going to be passed to any syscalls.
-        addr.hostport =
-            VString(util::make_hostport("localhost", get_config()->port));
+        addr.hostport = ImmutableString(
+            util::make_hostport("localhost", get_config()->port));
 
         auto path = addr.host.c_str();
         auto pathlen = addr.host.size();
@@ -2560,7 +2560,7 @@ int main(int argc, char **argv) {
       }
 
       addr.hostport =
-          VString(util::make_hostport(addr.host.c_str(), addr.port));
+          ImmutableString(util::make_hostport(addr.host.c_str(), addr.port));
 
       if (resolve_hostname(
               &addr.addr, addr.host.c_str(), addr.port,

src/shrpx_client_handler.cc

@@ -843,8 +843,8 @@ void ClientHandler::write_accesslog(Downstream *downstream) {
                     ? construct_absolute_request_uri(req)
                     : req.path.empty()
                           ? req.method == HTTP_OPTIONS
-                                ? StringAdaptor::from_lit("*")
-                                : StringAdaptor::from_lit("-")
+                                ? StringRef::from_lit("*")
+                                : StringRef::from_lit("-")
                           : req.path,
 
           alpn_, nghttp2::ssl::get_tls_session_info(&tls_info, conn_.tls.ssl),
@@ -869,8 +869,8 @@ void ClientHandler::write_accesslog(int major, int minor, unsigned int status,
       get_config()->accesslog_format,
       LogSpec{
           nullptr, ipaddr_,
-          StringAdaptor::from_lit("-"), // method
-          StringAdaptor::from_lit("-"), // path,
+          StringRef::from_lit("-"), // method
+          StringRef::from_lit("-"), // path,
           alpn_, nghttp2::ssl::get_tls_session_info(&tls_info, conn_.tls.ssl),
           time_now,
           highres_now,  // request_start_time TODO is

src/shrpx_config.cc

@@ -1393,7 +1393,7 @@ int parse_config(const char *opt, const char *optarg,
     DownstreamAddr addr;
     if (util::istarts_with(optarg, SHRPX_UNIX_PATH_PREFIX)) {
       auto path = optarg + str_size(SHRPX_UNIX_PATH_PREFIX);
-      addr.host = VString(path, pat_delim);
+      addr.host = ImmutableString(path, pat_delim);
       addr.host_unix = true;
     } else {
       if (split_host_port(host, sizeof(host), &port, optarg,
@@ -1401,7 +1401,7 @@ int parse_config(const char *opt, const char *optarg,
         return -1;
       }
 
-      addr.host = VString(host);
+      addr.host = ImmutableString(host);
       addr.port = port;
     }
 

src/shrpx_config.h

@@ -245,8 +245,8 @@ struct DownstreamAddr {
   Address addr;
   // backend address.  If |host_unix| is true, this is UNIX domain
   // socket path.
-  VString host;
-  VString hostport;
+  ImmutableString host;
+  ImmutableString hostport;
   // backend port.  0 if |host_unix| is true.
   uint16_t port;
   // true if |host| contains UNIX domain socket path.
@@ -311,7 +311,7 @@ struct Config {
   // string is provided.
   std::string forwarded_for_obfuscated;
   std::string backend_tls_sni_name;
-  StringAdaptor server_name;
+  StringRef server_name;
   std::chrono::seconds tls_session_timeout;
   ev_tstamp http2_upstream_read_timeout;
   ev_tstamp upstream_read_timeout;

src/shrpx_http2_downstream_connection.cc

@@ -269,7 +269,7 @@ int Http2DownstreamConnection::push_request_headers() {
 
   // For HTTP/1.0 request, there is no authority in request.  In that
   // case, we use backend server's host nonetheless.
-  auto authority = StringAdaptor(downstream_hostport);
+  auto authority = StringRef(downstream_hostport);
 
   if (no_host_rewrite && !req.authority.empty()) {
     authority = req.authority;

src/shrpx_http_downstream_connection.cc

@@ -219,13 +219,13 @@ int HttpDownstreamConnection::push_request_headers() {
 
   // For HTTP/1.0 request, there is no authority in request.  In that
   // case, we use backend server's host nonetheless.
-  auto authority = StringAdaptor(downstream_hostport);
+  auto authority = StringRef(downstream_hostport);
   auto no_host_rewrite = get_config()->no_host_rewrite ||
                          get_config()->http2_proxy ||
                          get_config()->client_proxy || connect_method;
 
   if (no_host_rewrite && !req.authority.empty()) {
-    authority = StringAdaptor(req.authority);
+    authority = StringRef(req.authority);
   }
 
   downstream_->set_request_downstream_host(authority.str());

src/shrpx_log.cc

@@ -184,7 +184,7 @@ std::pair<OutputIterator, size_t> copy(const std::string &src, size_t avail,
 
 namespace {
 template <typename OutputIterator>
-std::pair<OutputIterator, size_t> copy(const StringAdaptor &src, size_t avail,
+std::pair<OutputIterator, size_t> copy(const StringRef &src, size_t avail,
                                        OutputIterator oitr) {
   return copy(src.c_str(), src.size(), avail, oitr);
 }

src/shrpx_log.h

@@ -142,10 +142,10 @@ struct LogFragment {
 
 struct LogSpec {
   Downstream *downstream;
-  StringAdaptor remote_addr;
-  StringAdaptor method;
-  StringAdaptor path;
-  StringAdaptor alpn;
+  StringRef remote_addr;
+  StringRef method;
+  StringRef path;
+  StringRef alpn;
   const nghttp2::ssl::TLSSessionInfo *tls_info;
   std::chrono::system_clock::time_point time_now;
   std::chrono::high_resolution_clock::time_point request_start_time;
@@ -153,7 +153,7 @@ struct LogSpec {
   int major, minor;
   unsigned int status;
   int64_t body_bytes_sent;
-  StringAdaptor remote_port;
+  StringRef remote_port;
   uint16_t server_port;
   pid_t pid;
 };

src/shrpx_ssl.cc

@@ -972,8 +972,8 @@ int check_cert(SSL *ssl, const DownstreamAddr *addr) {
     return -1;
   }
   auto hostname = !get_config()->backend_tls_sni_name.empty()
-                      ? StringAdaptor(get_config()->backend_tls_sni_name)
-                      : StringAdaptor(addr->host);
+                      ? StringRef(get_config()->backend_tls_sni_name)
+                      : StringRef(addr->host);
   if (verify_hostname(cert, hostname.c_str(), hostname.size(), &addr->addr) !=
       0) {
     LOG(ERROR) << "Certificate verification failed: hostname does not match";

src/template.h

@@ -211,22 +211,25 @@ inline std::unique_ptr<char[]> strcopy(const std::unique_ptr<char[]> &val,
   return strcopy(val.get(), val.get() + n);
 }
 
-// VString represents string.  It has c_str() and size() functions to
-// mimic std::string.  It manages buffer by itself.  Just like
-// std::string, c_str() returns NULL-terminated string, but NULL
-// character may appear before the final terminal NULL.
-struct VString {
-  VString() : len(0) {}
-  VString(const char *s, size_t slen) : len(slen), base(strcopy(s, len)) {}
-  VString(const char *s) : len(strlen(s)), base(strcopy(s, len)) {}
-  VString(const std::string &s) : len(s.size()), base(strcopy(s)) {}
+// ImmutableString represents string that is immutable unlike
+// std::string.  It has c_str() and size() functions to mimic
+// std::string.  It manages buffer by itself.  Just like std::string,
+// c_str() returns NULL-terminated string, but NULL character may
+// appear before the final terminal NULL.
+class ImmutableString {
+public:
+  ImmutableString() : len(0) {}
+  ImmutableString(const char *s, size_t slen)
+      : len(slen), base(strcopy(s, len)) {}
+  ImmutableString(const char *s) : len(strlen(s)), base(strcopy(s, len)) {}
+  ImmutableString(const std::string &s) : len(s.size()), base(strcopy(s)) {}
   template <typename InputIt>
-  VString(InputIt first, InputIt last)
+  ImmutableString(InputIt first, InputIt last)
       : len(std::distance(first, last)), base(strcopy(first, last)) {}
-  VString(const VString &other)
+  ImmutableString(const ImmutableString &other)
       : len(other.len), base(strcopy(other.base, other.len)) {}
-  VString(VString &&) = default;
-  VString &operator=(const VString &other) {
+  ImmutableString(ImmutableString &&) = default;
+  ImmutableString &operator=(const ImmutableString &other) {
     if (this == &other) {
       return *this;
     }
@@ -234,30 +237,36 @@ struct VString {
     base = strcopy(other.base, other.len);
     return *this;
   }
-  VString &operator=(VString &&other) = default;
+  ImmutableString &operator=(ImmutableString &&other) = default;
+
+  template <size_t N> static ImmutableString from_lit(const char(&s)[N]) {
+    return ImmutableString(s, N - 1);
+  }
 
   const char *c_str() const { return base.get(); }
   size_t size() const { return len; }
 
+private:
   size_t len;
   std::unique_ptr<char[]> base;
 };
 
-// StringAdaptor behaves like simple string, but it does not own
-// pointer.  When it is default constructed, it has empty string.  You
-// can freely copy or move around this struct, but never free its
-// pointer.  str() function can be used to export the content as
-// std::string.
-struct StringAdaptor {
-  StringAdaptor() : base(""), len(0) {}
+// StringRef is a reference to a string owned by something else.  So
+// it behaves like simple string, but it does not own pointer.  When
+// it is default constructed, it has empty string.  You can freely
+// copy or move around this struct, but never free its pointer.  str()
+// function can be used to export the content as std::string.
+class StringRef {
+public:
+  StringRef() : base(""), len(0) {}
   template <typename T>
-  StringAdaptor(const T &s)
+  StringRef(const T &s)
       : base(s.c_str()), len(s.size()) {}
-  StringAdaptor(const char *s) : base(s), len(strlen(s)) {}
-  StringAdaptor(const char *s, size_t n) : base(s), len(n) {}
+  StringRef(const char *s) : base(s), len(strlen(s)) {}
+  StringRef(const char *s, size_t n) : base(s), len(n) {}
 
-  template <size_t N> static StringAdaptor from_lit(const char(&s)[N]) {
-    return StringAdaptor(s, N - 1);
+  template <size_t N> static StringRef from_lit(const char(&s)[N]) {
+    return StringRef(s, N - 1);
   }
 
   const char *c_str() const { return base; }
@@ -265,6 +274,7 @@ struct StringAdaptor {
 
   std::string str() const { return std::string(base, len); }
 
+private:
   const char *base;
   size_t len;
 };