CMakeLists.txt

@@ -210,6 +210,8 @@ set(TILE_SRCS
     "tile/rpc/protocol/http/buffer_io.cc"
     "tile/rpc/protocol/message.cc"
     # "tile/rpc/server.cc"
+    "tile/util/config.cc"
+    "tile/util/ini_file_config.cc"
 )
 
 if((NOT TILE_HAVE_GETIFADDRS) OR (NOT TILE_HAVE_FREEIFADDRS))
@@ -366,6 +368,7 @@ if(TILE_BUILD_TESTS)
   tile_add_custom_test("custom_http_client_test" "tests/http_client_test.cc")
   # tile_add_test(base_internal_time_keeper_test
   # "tile/base/internal/time_keeper_test.cc")
+  tile_add_test(tile_util_ini_file_config_test "tile/util/ini_file_config_test.cc")
 endif(TILE_BUILD_TESTS)
 
 if(TILE_BUILD_BENCHMARKS)

tile/base/casting.h

@@ -10,10 +10,32 @@
 #include "tile/base/likely.h"
 
 namespace tile {
+namespace detail {
+// Has classof
+template <typename T, typename Base> struct HasClassofImpl {
+  template <
+      typename TT, typename TBase,
+      typename = enable_if_t<std::is_same<
+          decltype(TT::classof(std::declval<const TBase &>())), bool>::value>>
+  static std::true_type test(int);
+  template <typename TT, typename TBase> static std::false_type test(...);
+
+  static constexpr bool value = decltype(test<T, Base>(0))::value;
+};
+} // namespace detail
+
 template <typename T, typename = void> struct CastingTraits {
-  template <typename U> static bool RuntimeTypeCheck(const U &val) {
+  template <typename Base>
+  static auto RuntimeTypeCheck(const Base &val)
+      -> enable_if_t<detail::HasClassofImpl<T, Base>::value, bool> {
     return T::classof(val);
   }
+
+  template <typename Base>
+  static auto RuntimeTypeCheck(const Base &val)
+      -> enable_if_t<!detail::HasClassofImpl<T, Base>::value, bool> {
+    return dynamic_cast<const T *>(&val) != nullptr;
+  }
 };
 
 class Castable {

tile/base/internal/logging.h

@@ -637,6 +637,11 @@ public:
                        size_t message_len);
 };
 
+class FileLogSink : public LogSink {
+public:
+  FileLogSink(const std::string &file_path_template);
+};
+
 void AddLogSink(LogSink *dest);
 void RemoveLogSink(LogSink *dest);
 void SetStderrLogging(LogSeverity min_severity);

tile/base/ref_ptr.h

@@ -3,6 +3,8 @@
 
 #pragma once
 
+#include "tile/base/casting.h"
+#include "tile/base/down_cast.h"
 #include "tile/base/internal/logging.h"
 #include "tile/base/internal/meta.h"
 #include "tile/base/internal/utility.h"
@@ -333,6 +335,12 @@ public:
     return internal::Exchange(ptr_, nullptr);
   }
 
+  template <typename U> bool Is() const noexcept { return isa<U>(ptr_); }
+
+  template <typename U> RefPtr<U> As() const noexcept {
+    return RefPtr<U>(ref_ptr, down_cast<U>(ptr_));
+  }
+
 private:
   T *ptr_;
 };

tile/base/string.cc

@@ -83,35 +83,30 @@ std::vector<Slice> Split(Slice s, Slice delim, bool keep_empty,
 
   TILE_CHECK_GE(max_split_parts, 0, "`max_split_parts` must be greater than 0");
 
-  constexpr std::size_t kMaxSplit = -1;
+  constexpr std::size_t kMaxSplit = std::numeric_limits<std::size_t>::max();
   std::vector<Slice> splited;
-  if (s.empty()) {
+  if (s.empty() || max_split_parts == 1) {
     return splited;
   }
   auto current = s;
   assert(!delim.empty());
   int split_count = 0;
   while (max_split_parts == kMaxSplit || split_count < max_split_parts) {
-    auto pos = current.find(delim);
+    auto next_pos = current.find(delim);
-    if (pos != 0 || keep_empty) {
+    auto part = current.substr(0, next_pos);
-      splited.push_back(current.substr(0, pos));
+    if (!part.empty() || keep_empty) {
-      ++split_count;
+      splited.push_back(part);
     }
 
-    if (pos == Slice::npos) {
+    ++split_count;
-      break;
-    }
 
-    current = current.substr(pos + delim.size());
+    if (next_pos == Slice::npos) {
-    if (current.empty()) {
-      if (keep_empty) {
-        splited.push_back("");
-      }
       break;
-    } else if (split_count + 1 == max_split_parts) {
+    } else if (split_count + 1 >= max_split_parts) {
-      // ++split_count;
+      splited.push_back(current.substr(next_pos + delim.size()));
-      splited.push_back(current);
       break;
+    } else {
+      current = current.substr(next_pos + delim.size());
     }
   }
 
@@ -119,22 +114,36 @@ std::vector<Slice> Split(Slice s, Slice delim, bool keep_empty,
 }
 
 Slice TrimLeft(Slice s, Slice cutset) {
-  while (!s.empty() && cutset.find(Slice(s.data(), 1)) != Slice::npos) {
+  return TrimLeft(s, [&cutset](char c) {
+    return cutset.find(Slice(&c, 1)) != Slice::npos;
+  });
+}
+
+Slice TrimRight(Slice s, Slice cutset) {
+  return TrimRight(s, [&cutset](char c) {
+    return cutset.find(Slice(&c, 1)) != Slice::npos;
+  });
+}
+
+Slice Trim(Slice s, Slice cutset) {
+  return Trim(s, [&cutset](char c) {
+    return cutset.find(Slice(&c, 1)) != Slice::npos;
+  });
+}
+Slice TrimLeft(Slice s, std::function<bool(char)> pred) {
+  while (!s.empty() && pred(s[0])) {
     s.RemovePrefix(1);
   }
   return s;
 }
-
+Slice TrimRight(Slice s, std::function<bool(char)> pred) {
-Slice TrimRight(Slice s, Slice cutset) {
+  while (!s.empty() && pred(s[s.size() - 1])) {
-  while (!s.empty() &&
-         cutset.find(Slice(s.data() + s.size() - 1, 1)) != Slice::npos) {
     s.RemoveSuffix(1);
   }
   return s;
 }
-
+Slice Trim(Slice s, std::function<bool(char)> pred) {
-Slice Trim(Slice s, Slice cutset) {
+  return TrimRight(TrimLeft(s, pred), pred);
-  return TrimRight(TrimLeft(s, cutset), cutset);
 }
 
 template <typename T>
@@ -198,11 +207,23 @@ std::string ToLower(Slice s) {
   return result;
 }
 
-bool Equals(Slice a, Slice b) {
+bool Equals(Slice a, Slice b, std::size_t len) {
+  if (a.size() > len) {
+    a.RemoveSuffix(a.size() - len);
+  }
+  if (b.size() > len) {
+    b.RemoveSuffix(b.size() - len);
+  }
   return a.size() == b.size() && std::equal(a.begin(), a.end(), b.begin());
 }
 
-bool EqualsIgnoreCase(Slice a, Slice b) {
+bool EqualsIgnoreCase(Slice a, Slice b, std::size_t len) {
+  if (a.size() > len) {
+    a.RemoveSuffix(a.size() - len);
+  }
+  if (b.size() > len) {
+    b.RemoveSuffix(b.size() - len);
+  }
   return a.size() == b.size() &&
          std::equal(a.begin(), a.end(), b.begin(),
                     [](char a, char b) { return ToLower(a) == ToLower(b); });
@@ -213,21 +234,27 @@ TryParseTraits<bool>::TryParse(Slice s, bool recognizes_alpbabet_symbol,
                                bool ignore_case) {
   auto num_opt = tile::TryParse<int>(s);
   if (num_opt) {
-    if (*num_opt == 0) {
+    return *num_opt != 0;
+  } else {
+    const std::vector<std::string> true_arr{"true", "yes", "on", "y"};
+    const std::vector<std::string> false_arr{"false", "no", "off", "n"};
+    if (s.size() > 5) {
       return false;
-    } else if (*num_opt == 1) {
-      return true;
     }
 
-    return std::nullopt;
+    auto InArray = [](const std::vector<std::string> &arr, Slice s) {
-  }
+      for (auto &&e : arr) {
-
+        if (EqualsIgnoreCase(e, s)) {
-  if (EqualsIgnoreCase(s, "y") || EqualsIgnoreCase(s, "yes") ||
+          return true;
-      EqualsIgnoreCase(s, "true")) {
+        }
-    return true;
+      }
-  } else if (EqualsIgnoreCase(s, "n") || EqualsIgnoreCase(s, "no") ||
+      return false;
-             EqualsIgnoreCase(s, "false")) {
+    };
-    return false;
+    if (InArray(true_arr, s)) {
+      return true;
+    } else if (InArray(false_arr, s)) {
+      return false;
+    }
   }
 
   return std::nullopt;

tile/base/string.h

@@ -34,14 +34,19 @@ std::string
 Replace(Slice str, Slice from, Slice to,
         std::size_t count = std::numeric_limits<std::size_t>::max());
 
-Slice TrimLeft(Slice s, Slice cutset = " \t");
+Slice TrimLeft(Slice s, Slice cutset);
-Slice TrimRight(Slice s, Slice cutset = " \t");
+Slice TrimRight(Slice s, Slice cutset);
-Slice Trim(Slice s, Slice cutset = " \t");
+Slice Trim(Slice s, Slice cutset);
+Slice TrimLeft(Slice s, std::function<bool(char)> pred = isspace);
+Slice TrimRight(Slice s, std::function<bool(char)> pred = isspace);
+Slice Trim(Slice s, std::function<bool(char)> pred = isspace);
 
-std::vector<Slice> Split(Slice s, char delim, bool keep_empty = false,
+std::vector<Slice>
-                         std::size_t max_split_parts = -1);
+Split(Slice s, char delim, bool keep_empty = false,
-std::vector<Slice> Split(Slice s, Slice delim, bool keep_empty = false,
+      std::size_t max_split_parts = std::numeric_limits<std::size_t>::max());
-                         std::size_t max_split_parts = -1);
+std::vector<Slice>
+Split(Slice s, Slice delim, bool keep_empty = false,
+      std::size_t max_split_parts = std::numeric_limits<std::size_t>::max());
 
 std::string Join(const std::vector<std::string> &parts, Slice delim);
 std::string Join(const std::vector<Slice> &parts, Slice delim);
@@ -54,8 +59,11 @@ void ToLower(std::string *str);
 std::string ToUpper(Slice s);
 std::string ToLower(Slice s);
 
-bool Equals(Slice a, Slice b);
+bool Equals(Slice a, Slice b,
-bool EqualsIgnoreCase(Slice a, Slice b);
+            std::size_t len = std::numeric_limits<std::size_t>::max());
+bool EqualsIgnoreCase(
+    Slice a, Slice b,
+    std::size_t len = std::numeric_limits<std::size_t>::max());
 
 // TryParse
 template <typename T, typename = void> struct TryParseTraits;
@@ -73,6 +81,10 @@ template <typename T, typename> struct TryParseTraits {
 };
 
 // String to bool
+// 1. "true" or "false"
+// 2. "yes" or "no"
+// 3. "on" or "off"
+// 4. non-zero or zero
 template <> struct TryParseTraits<bool> {
   static std::optional<bool> TryParse(Slice s,
                                       bool recognizes_alpbabet_symbol = true,

tile/base/string_test.cc

@@ -102,7 +102,7 @@ TEST(String, TryParseFloatingPoint) {
 TEST(String, TryParseBool) {
   ASSERT_FALSE(TryParse<bool>(""));
   ASSERT_FALSE(TryParse<bool>(".."));
-  ASSERT_FALSE(TryParse<bool>("2"));
+  ASSERT_TRUE(TryParse<bool>("2"));
 
   ASSERT_TRUE(TryParse<bool>("1"));
   ASSERT_TRUE(TryParse<bool>("0"));

tile/io/event_loop.cc

@@ -24,7 +24,7 @@ void EventLoop::Barrier() {}
 void EventLoop::Run() {}
 void EventLoop::Stop() {}
 void EventLoop::Join() {}
-EventLoop *EventLoop::Current() {}
+EventLoop *EventLoop::Current() { return nullptr; }
 void EventLoop::WaitAndRunEvents(std::chrono::milliseconds wait_for) {}
 void EventLoop::RunUserTasks() {}
 } // namespace tile

tile/sigslot/signal.h

@@ -1,71 +0,0 @@
-#ifndef TILE_SIGSLOT_SIGNAL_H
-#define TILE_SIGSLOT_SIGNAL_H
-
-#pragma once
-#include "tile/base/internal/meta.h"
-#include <functional>
-#include <set>
-
-/**
- * tile::sigslot::Signal<void(int)> signal;
- **/
-
-namespace tile {
-namespace sigslot {
-
-class NonLock {
-public:
-  void Lock() {}
-  void Unlock() {}
-};
-
-class GlobalLock {
-  void Lock();
-  void Unlock();
-};
-
-class ThreadedLock {
-  void Lock();
-  void Unlock();
-};
-
-class Connection {
-public:
-};
-
-class Slot {
-public:
-  Slot() = default;
-  virtual ~Slot() = default;
-
-private:
-  std::set<Connection> connections_;
-};
-
-template <typename> class Signal;
-template <typename R, typename... Args> class Signal<R(Args...)> {
-public:
-  using SlotType = std::function<R(Args...)>;
-
-  R Emit(Args... args) const;
-  R operator()(Args... args) const { Emit(std::forward<Args>(args)...); };
-
-  // function ptr
-  Connection Connect(R (*func)(Args...));
-
-  // member function
-  template <typename C> Connection Connect(C *clz, R (C::*mem_fn)(Args...));
-
-  // lambda function
-  Connection Connect(std::function<R(Args...)> lambda_fn);
-  template <typename Functor,
-            typename = enable_if_t<std::is_same<
-                decltype(std::declval<Functor>()(std::declval<Args>()...)),
-                R>::value>>
-  Connection Connect(Functor functor);
-};
-
-} // namespace sigslot
-} // namespace tile
-
-#endif // TILE_SIGSLOT_SIGNAL_H

tile/util/config.cc

@@ -0,0 +1,113 @@
+#include "tile/util/config.h"
+#include "tile/base/thread/unique_lock.h"
+
+namespace tile {
+namespace util {
+bool Config::Has(const Slice &key) const {
+  UniqueLock<tile::Mutex> lock(mutex_);
+  std::string value;
+  return GetRaw(key, &value);
+}
+
+void Config::Remove(const Slice &key) {}
+
+void Config::EnableEvents(bool enable) { events_enabled_ = enable; }
+bool Config::EventsEnabled() const { return events_enabled_; }
+
+Config::Keys Config::keys(const Slice &root) const {
+  UniqueLock<tile::Mutex> lock(mutex_);
+  return Enumerate(root);
+}
+
+#define TILE_DEFINE_CONFIG_GETTER(type, name)                                  \
+  std::optional<type> Config::Get##name(const Slice &key) const {              \
+    std::string value;                                                         \
+    if (GetRaw(key, &value)) {                                                 \
+      auto opt = TryParseTraits<type>::TryParse(value);                        \
+      if (opt.has_value()) {                                                   \
+        return *opt;                                                           \
+      } else {                                                                 \
+        return std::nullopt;                                                   \
+      }                                                                        \
+    } else {                                                                   \
+      return std::nullopt;                                                     \
+    }                                                                          \
+  }                                                                            \
+  type Config::Get##name(const Slice &key, type default_value) const {         \
+    auto opt = Get##name(key);                                                 \
+    if (opt.has_value()) {                                                     \
+      return *opt;                                                             \
+    } else {                                                                   \
+      return default_value;                                                    \
+    }                                                                          \
+  }
+
+#define TILE_DEFINE_CONFIG_SETTER(type, name)                                  \
+  void Config::Set##name(const Slice &key, type value) {                       \
+    SetRawWithEvent(key, Format("{}", value));                                 \
+  }
+
+std::optional<std::string> Config::GetString(const Slice &key) const {
+  std::string value;
+  UniqueLock<tile::Mutex> lock(mutex_);
+  if (GetRaw(key, &value)) {
+    return value;
+  } else {
+    return std::nullopt;
+  }
+}
+
+std::string Config::GetString(const Slice &key,
+                              std::string default_value) const {
+  auto opt = GetString(key);
+  return opt.has_value() ? *opt : default_value;
+}
+
+void Config::SetString(const Slice &key, const std::string &value) {
+  SetRawWithEvent(key, value);
+}
+void Config::SetBool(const Slice &key, bool value) {
+  SetRawWithEvent(key, value ? "true" : "false");
+}
+
+TILE_DEFINE_CONFIG_GETTER(int, Int)
+TILE_DEFINE_CONFIG_GETTER(unsigned int, UInt)
+TILE_DEFINE_CONFIG_GETTER(int16_t, Int16)
+TILE_DEFINE_CONFIG_GETTER(int32_t, Int32)
+TILE_DEFINE_CONFIG_GETTER(int64_t, Int64)
+TILE_DEFINE_CONFIG_GETTER(uint16_t, UInt16)
+TILE_DEFINE_CONFIG_GETTER(uint32_t, UInt32)
+TILE_DEFINE_CONFIG_GETTER(uint64_t, UInt64)
+TILE_DEFINE_CONFIG_GETTER(double, Double)
+TILE_DEFINE_CONFIG_GETTER(bool, Bool)
+
+TILE_DEFINE_CONFIG_SETTER(int, Int)
+TILE_DEFINE_CONFIG_SETTER(unsigned int, UInt)
+TILE_DEFINE_CONFIG_SETTER(int16_t, Int16)
+TILE_DEFINE_CONFIG_SETTER(int32_t, Int32)
+TILE_DEFINE_CONFIG_SETTER(int64_t, Int64)
+TILE_DEFINE_CONFIG_SETTER(uint16_t, UInt16)
+TILE_DEFINE_CONFIG_SETTER(uint32_t, UInt32)
+TILE_DEFINE_CONFIG_SETTER(uint64_t, UInt64)
+TILE_DEFINE_CONFIG_SETTER(double, Double)
+
+void Config::SetRawWithEvent(const Slice &key, const std::string &value) {
+  if (events_enabled_) {
+    OnChanging(key, value);
+  }
+
+  {
+    UniqueLock<tile::Mutex> lock(mutex_);
+    SetRaw(key, value);
+  }
+
+  if (events_enabled_) {
+    OnChanged(key, value);
+  }
+}
+
+Config::~Config() {}
+
+} // namespace util
+
+} // namespace tile

tile/util/config.h

@@ -3,8 +3,12 @@
 
 #pragma once
 
+#include "tile/base/optional.h"
 #include "tile/base/ref_ptr.h"
 #include "tile/base/slice.h"
+#include "tile/base/string.h"
+#include "tile/base/thread/mutex.h"
+#include "tile/sigslot/sigslot.h"
 #include <cstdint>
 
 namespace tile {
@@ -14,16 +18,42 @@ public:
   using Keys = std::vector<std::string>;
   using Ptr = RefPtr<Config>;
 
+  // events
+  // Key, Value
+  sigslot::signal2<const Slice &, const Slice &> OnChanging;
+  // Key, Value
+  sigslot::signal2<const Slice &, const Slice &> OnChanged;
+  // Key
+  sigslot::signal1<const Slice &> OnRemoving;
+  // Key
+  sigslot::signal1<const Slice &> OnRemoved;
+
   bool Has(const Slice &key) const;
+  void Remove(const Slice &key);
+  void EnableEvents(bool enable = true);
+  bool EventsEnabled() const;
+
+  Keys keys(const Slice &root = "") const;
 
 #define TILE_DECLARE_CONFIG_GETTER(type, name)                                 \
-  type Get##name(const Slice &key) const;                                      \
+  std::optional<type> Get##name(const Slice &key) const;                       \
   type Get##name(const Slice &key, type default_value) const;
 
 #define TILE_DECLARE_CONFIG_SETTER(type, name)                                 \
   virtual void Set##name(const Slice &key, type value);
 
   std::string GetRawString(const Slice &key, const Slice &default_value) const;
+  // std::stirng GetString()
+  // int GetInt()
+  // unsigned int GetUInt()
+  // int16_t GetInt16()
+  // int32_t GetInt32()
+  // int64_t GetInt64()
+  // uint16_t GetUInt16()
+  // uint32_t GetUInt32()
+  // uint64_t GetUInt64()
+  // double GetDouble()
+  // bool GetBool()
 
   // getters
   TILE_DECLARE_CONFIG_GETTER(std::string, String)
@@ -40,6 +70,17 @@ public:
 
 protected:
   // setters
+  // SetString(const Slice &key, const std::string &value)
+  // SetInt(const Slice &key, int value)
+  // SetUInt(const Slice &key, unsigned int value)
+  // SetInt16(const Slice &key, int16_t value)
+  // SetInt32(const Slice &key, int32_t value)
+  // SetInt64(const Slice &key, int64_t value)
+  // SetUInt16(const Slice &key, uint16_t value)
+  // SetUInt32(const Slice &key, uint32_t value)
+  // SetUInt64(const Slice &key, uint64_t value)
+  // SetDouble(const Slice &key, double value)
+  // SetBool(const Slice &key, bool value)
   TILE_DECLARE_CONFIG_SETTER(const std::string &, String)
   TILE_DECLARE_CONFIG_SETTER(int, Int)
   TILE_DECLARE_CONFIG_SETTER(unsigned int, UInt)
@@ -55,9 +96,30 @@ protected:
 #undef TILE_DECLARE_CONFIG_GETTER
 #undef TILE_DECLARE_CONFIG_SETTER
 
-  void Remove(const Slice &key);
+protected:
+  class ScopedLock {
+  public:
+    explicit ScopedLock(const Config &config) : config_(config) {
+      config_.mutex_.Lock();
+    }
+    ~ScopedLock() { config_.mutex_.Unlock(); }
 
-  Keys keys(const Slice &key_root = "") const;
+  private:
+    const Config &config_;
+  };
+
+  virtual bool GetRaw(const Slice &key, std::string *value) const = 0;
+  virtual void SetRaw(const Slice &key, const Slice &value) = 0;
+  virtual void RemoveRaw(const Slice &key) = 0;
+  virtual Keys Enumerate(const Slice &range) const = 0;
+  void SetRawWithEvent(const Slice &key, const std::string &value);
+  virtual ~Config();
+
+  friend class std::default_delete<Config>;
+
+private:
+  mutable Mutex mutex_;
+  bool events_enabled_{false};
 };
 } // namespace util
 } // namespace tile

tile/util/ini_file_config.cc

@@ -0,0 +1,144 @@
+#include "tile/util/ini_file_config.h"
+#include "tile/base/thread/scoped_lock.h"
+
+namespace tile {
+namespace util {
+
+IniFileConfig::IniFileConfig() {}
+// IniFileConfig::IniFileConfig(std::istream &istr) { load(istr); }
+// IniFileConfig::IniFileConfig(const std::string &path) { load(path); }
+IniFileConfig::~IniFileConfig() {}
+
+bool IniFileConfig::load(std::istream &istr) {
+  Config::ScopedLock lock(*this);
+  map_.clear();
+  section_key_.clear();
+  while (!istr.eof()) {
+    ParseLine(istr);
+  }
+  return true;
+}
+bool IniFileConfig::load(const std::string &path) {
+  std::ifstream istr(path);
+  if (istr.good()) {
+    return load(istr);
+  } else {
+    return false;
+  }
+}
+bool IniFileConfig::GetRaw(const Slice &key, std::string *value) const {
+  auto iter = map_.find(key.ToString());
+  if (iter != map_.end()) {
+    *value = iter->second;
+    return true;
+  } else {
+    return false;
+  }
+}
+void IniFileConfig::SetRaw(const Slice &key, const Slice &value) {
+  map_[key] = value;
+}
+
+void IniFileConfig::RemoveRaw(const Slice &key) {
+  std::string prefix = key;
+  if (!prefix.empty()) {
+    prefix.push_back('.');
+  }
+  IStringMap::iterator it = map_.begin();
+  IStringMap::iterator cur;
+  while (it != map_.end()) {
+    if (EqualsIgnoreCase(cur->first, key) ||
+        EqualsIgnoreCase(cur->first, prefix)) {
+      it = map_.erase(cur);
+    } else {
+      ++it;
+    }
+  }
+}
+
+Config::Keys IniFileConfig::Enumerate(const Slice &key) const {
+  Config::Keys range;
+  std::set<Slice> keys;
+  std::string prefix = key.ToString();
+  if (prefix.empty()) {
+    prefix.push_back('.');
+  }
+
+  std::string::size_type psize = prefix.size();
+  for (const auto &p : map_) {
+    auto &key = p.first;
+    if (EqualsIgnoreCase(key, prefix, psize)) {
+      std::string::size_type end = key.find('.', psize);
+      std::string subkey;
+      if (end == std::string::npos) {
+        subkey = key.substr(psize);
+      } else {
+        subkey = key.substr(psize, end - psize);
+      }
+
+      if (keys.find(subkey) == keys.end()) {
+        keys.insert(subkey);
+        range.push_back(subkey);
+      }
+    }
+  }
+  return range;
+}
+
+void IniFileConfig::ParseLine(std::istream &istr) {
+  static const int eof = std::char_traits<char>::eof();
+  auto ReadLine = [&](std::string *line) {
+    line->clear();
+    while (true) {
+      int c = istr.get();
+      if (c == eof || c == '\n') {
+        return c != eof;
+      } else {
+        *line += (char)c;
+      }
+    }
+  };
+
+  std::string raw_line;
+  while (ReadLine(&raw_line)) {
+    if (raw_line.empty()) {
+      continue;
+    }
+    Slice line = TrimLeft(raw_line);
+    if (line.empty() || line[0] == ';' || line[0] == '#') {
+      // skip empty line
+      // skip comment line ; or #
+      continue;
+    }
+
+    // parse section
+    if (line[0] == '[') {
+      auto pos = line.find(']');
+      if (pos == Slice::npos) {
+        section_key_ = Trim(line.substr(1));
+      } else {
+        section_key_ = Trim(line.substr(1, pos - 1));
+      }
+    } else {
+      auto strs = Split(line, "=", true, 2);
+      std::string full_key = section_key_;
+      if (!full_key.empty()) {
+        full_key.push_back('.');
+      }
+      full_key.append(Trim(strs[0]));
+      if (strs.size() > 1) {
+        map_[full_key] = Trim(strs[1]);
+      } else {
+        map_[full_key] = "";
+      }
+    }
+  }
+}
+bool IniFileConfig::ICompare::operator()(const std::string &s1,
+                                         const std::string &s2) const {
+  auto len = std::min(s1.size(), s2.size());
+  return strncmp(s1.c_str(), s2.c_str(), len) < 0;
+}
+
+} // namespace util
+} // namespace tile

tile/util/ini_file_config.h

@@ -0,0 +1,40 @@
+#ifndef TILE_UTIL_INI_FILE_CONFIG_H
+#define TILE_UTIL_INI_FILE_CONFIG_H
+
+#pragma once
+
+#include "tile/util/config.h"
+#include <map>
+
+namespace tile {
+namespace util {
+class IniFileConfig : public Config {
+public:
+  using Ptr = RefPtr<IniFileConfig>;
+
+  IniFileConfig();
+  ~IniFileConfig() override;
+  // IniFileConfig(std::istream &istr);
+  // IniFileConfig(const std::string &path);
+  bool load(std::istream &istr);
+  bool load(const std::string &path);
+
+protected:
+  bool GetRaw(const Slice &key, std::string *value) const override;
+  void SetRaw(const Slice &key, const Slice &value) override;
+  void RemoveRaw(const Slice &key) override;
+  Keys Enumerate(const Slice &range) const override;
+
+private:
+  void ParseLine(std::istream &istr);
+  struct ICompare {
+    bool operator()(const std::string &s1, const std::string &s2) const;
+  };
+  typedef std::map<std::string, std::string, ICompare> IStringMap;
+  IStringMap map_;
+  std::string section_key_;
+};
+} // namespace util
+} // namespace tile
+
+#endif // TILE_UTIL_INI_FILE_CONFIG_H

tile/util/ini_file_config_test.cc

@@ -0,0 +1,46 @@
+#include "tile/util/ini_file_config.h"
+#include "gtest/gtest.h"
+
+const char *kIniFileConfig = R"(
+# comment 1
+; comment 2
+  # commet 3
+  ; commment 4
+a=1
+[sec1]
+a=2
+[sec3]
+a=3
+[sec2.kk]
+a=4
+)";
+
+namespace tile {
+namespace util {
+
+static_assert(!detail::HasClassofImpl<IniFileConfig, Config>::value, "");
+
+TEST(IniFileConfig, LoadFromIStream) {
+  std::stringstream ss(kIniFileConfig);
+  Config::Ptr config = MakeRefCounted<IniFileConfig>();
+  ASSERT_FALSE(config->Has("a"));
+  ASSERT_FALSE(config->Has("sec1.a"));
+  ASSERT_FALSE(config->Has("sec3.a"));
+  if (config.Is<IniFileConfig>()) {
+    IniFileConfig::Ptr ini = config.As<IniFileConfig>();
+    ASSERT_TRUE(ini->load(ss));
+  }
+  ASSERT_TRUE(config->Has("a"));
+  ASSERT_TRUE(config->Has("sec1.a"));
+  ASSERT_TRUE(config->Has("sec3.a"));
+  ASSERT_TRUE(config->Has("sec2.kk.a"));
+
+  ASSERT_TRUE(config->GetInt("a"));
+  ASSERT_TRUE(config->GetInt("sec1.a"));
+  ASSERT_EQ(1, *config->GetInt("a"));
+  ASSERT_EQ(2, *config->GetInt("sec1.a"));
+  ASSERT_EQ(3, *config->GetInt("sec3.a"));
+  ASSERT_EQ(4, *config->GetInt("sec2.kk.a"));
+}
+} // namespace util
+} // namespace tile