[CELEBORN-1799][CIP-14] Add celebornConf to cppClient

### What changes were proposed in this pull request?
Add CelebornConf to cppClient.

### Why are the changes needed?
The CelebornConf will be used as configuration module in cppClient.

### Does this PR introduce _any_ user-facing change?
No.

### How was this patch tested?
Compilation and UTs.

Closes #3027 from HolyLow/issue/celeborn-1799-add-celeborn-conf-to-cppClient.

Authored-by: HolyLow <jiaming.xie7@gmail.com>
Signed-off-by: mingji <fengmingxiao.fmx@alibaba-inc.com>

cpp/celeborn/conf/CMakeLists.txt

@@ -12,7 +12,7 @@
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
-add_library(conf BaseConf.cpp)
+add_library(conf BaseConf.cpp CelebornConf.cpp)
 
 target_link_libraries(
         conf

cpp/celeborn/conf/CelebornConf.cpp

@@ -0,0 +1,198 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <re2/re2.h>
+
+#include "celeborn/conf/CelebornConf.h"
+
+namespace celeborn {
+namespace {
+
+// folly::to<> does not generate 'true' and 'false', so we do it ourselves.
+std::string bool2String(bool value) {
+  return value ? "true" : "false";
+}
+
+#define STR_PROP(_key_, _val_) {std::string(_key_), std::string(_val_)}
+#define NUM_PROP(_key_, _val_) \
+  {std::string(_key_), folly::to<std::string>(_val_)}
+#define BOOL_PROP(_key_, _val_) {std::string(_key_), bool2String(_val_)}
+#define NONE_PROP(_key_) {std::string(_key_), folly::none}
+
+enum class CapacityUnit {
+  BYTE,
+  KILOBYTE,
+  MEGABYTE,
+  GIGABYTE,
+  TERABYTE,
+  PETABYTE
+};
+
+double toBytesPerCapacityUnit(CapacityUnit unit) {
+  switch (unit) {
+    case CapacityUnit::BYTE:
+      return 1;
+    case CapacityUnit::KILOBYTE:
+      return exp2(10);
+    case CapacityUnit::MEGABYTE:
+      return exp2(20);
+    case CapacityUnit::GIGABYTE:
+      return exp2(30);
+    case CapacityUnit::TERABYTE:
+      return exp2(40);
+    case CapacityUnit::PETABYTE:
+      return exp2(50);
+    default:
+      CELEBORN_USER_FAIL("Invalid capacity unit '{}'", (int)unit);
+  }
+}
+
+CapacityUnit valueOfCapacityUnit(const std::string& unitStr) {
+  if (unitStr == "B") {
+    return CapacityUnit::BYTE;
+  }
+  if (unitStr == "kB") {
+    return CapacityUnit::KILOBYTE;
+  }
+  if (unitStr == "MB") {
+    return CapacityUnit::MEGABYTE;
+  }
+  if (unitStr == "GB") {
+    return CapacityUnit::GIGABYTE;
+  }
+  if (unitStr == "TB") {
+    return CapacityUnit::TERABYTE;
+  }
+  if (unitStr == "PB") {
+    return CapacityUnit::PETABYTE;
+  }
+  CELEBORN_USER_FAIL("Invalid capacity unit '{}'", unitStr);
+}
+
+// Convert capacity string with unit to the capacity number in the specified
+// units
+uint64_t toCapacity(const std::string& from, CapacityUnit to) {
+  static const RE2 kPattern(R"(^\s*(\d+(?:\.\d+)?)\s*([a-zA-Z]+)\s*$)");
+  double value;
+  std::string unit;
+  if (!RE2::FullMatch(from, kPattern, &value, &unit)) {
+    CELEBORN_USER_FAIL("Invalid capacity string '{}'", from);
+  }
+
+  return value *
+      (toBytesPerCapacityUnit(valueOfCapacityUnit(unit)) /
+       toBytesPerCapacityUnit(to));
+}
+
+Duration toDuration(const std::string& str) {
+  static const RE2 kPattern(R"(^\s*(\d+(?:\.\d+)?)\s*([a-zA-Z]+)\s*)");
+
+  double value;
+  std::string unit;
+  if (!RE2::FullMatch(str, kPattern, &value, &unit)) {
+    CELEBORN_USER_FAIL("Invalid duration {}", str);
+  }
+  if (unit == "ns") {
+    return std::chrono::duration<double, std::nano>(value);
+  } else if (unit == "us") {
+    return std::chrono::duration<double, std::micro>(value);
+  } else if (unit == "ms") {
+    return std::chrono::duration<double, std::milli>(value);
+  } else if (unit == "s") {
+    return Duration(value);
+  } else if (unit == "m") {
+    return std::chrono::duration<double, std::ratio<60>>(value);
+  } else if (unit == "h") {
+    return std::chrono::duration<double, std::ratio<60 * 60>>(value);
+  } else if (unit == "d") {
+    return std::chrono::duration<double, std::ratio<60 * 60 * 24>>(value);
+  }
+  CELEBORN_USER_FAIL("Invalid duration {}", str);
+}
+
+} // namespace
+
+const std::unordered_map<std::string, folly::Optional<std::string>>
+    CelebornConf::kDefaultProperties = {
+        STR_PROP(kRpcLookupTimeout, "30s"),
+        STR_PROP(kClientRpcGetReducerFileGroupRpcAskTimeout, "60s"),
+        STR_PROP(kNetworkConnectTimeout, "10s"),
+        STR_PROP(kClientFetchTimeout, "600s"),
+        NUM_PROP(kNetworkIoNumConnectionsPerPeer, "1"),
+        NUM_PROP(kNetworkIoClientThreads, 0),
+        NUM_PROP(kClientFetchMaxReqsInFlight, 3),
+        // NUM_PROP(kNumExample, 50'000),
+        // BOOL_PROP(kBoolExample, false),
+};
+
+CelebornConf::CelebornConf() {
+  registeredProps_ = kDefaultProperties;
+}
+
+CelebornConf::CelebornConf(const std::string& filename) {
+  initialize(filename);
+  registeredProps_ = kDefaultProperties;
+}
+
+CelebornConf::CelebornConf(const CelebornConf& other) {
+  if (auto* memConfig =
+          dynamic_cast<core::MemConfigMutable*>(other.config_.get())) {
+    config_ =
+        std::make_unique<core::MemConfigMutable>(other.config_->valuesCopy());
+  } else {
+    config_ = std::make_unique<core::MemConfig>(other.config_->valuesCopy());
+  }
+  registeredProps_ = other.registeredProps_;
+  filePath_ = other.filePath_;
+}
+
+void CelebornConf::registerProperty(
+    const std::string_view& key,
+    const std::string& value) {
+  setValue(static_cast<std::string>(key), value);
+}
+
+Timeout CelebornConf::rpcLookupTimeout() const {
+  return toTimeout(toDuration(optionalProperty(kRpcLookupTimeout).value()));
+}
+
+Timeout CelebornConf::clientRpcGetReducerFileGroupRpcAskTimeout() const {
+  return toTimeout(toDuration(
+      optionalProperty(kClientRpcGetReducerFileGroupRpcAskTimeout).value()));
+}
+
+Timeout CelebornConf::networkConnectTimeout() const {
+  return toTimeout(
+      toDuration(optionalProperty(kNetworkConnectTimeout).value()));
+}
+
+Timeout CelebornConf::clientFetchTimeout() const {
+  return toTimeout(toDuration(optionalProperty(kClientFetchTimeout).value()));
+}
+
+int CelebornConf::networkIoNumConnectionsPerPeer() const {
+  return std::stoi(optionalProperty(kNetworkIoNumConnectionsPerPeer).value());
+}
+
+int CelebornConf::networkIoClientThreads() const {
+  return std::stoi(optionalProperty(kNetworkIoClientThreads).value());
+}
+
+int CelebornConf::clientFetchMaxReqsInFlight() const {
+  return std::stoi(optionalProperty(kClientFetchMaxReqsInFlight).value());
+}
+} // namespace celeborn

cpp/celeborn/conf/CelebornConf.h

@@ -0,0 +1,85 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "celeborn/conf/BaseConf.h"
+#include "celeborn/utils/CelebornUtils.h"
+
+namespace celeborn {
+/***
+ * steps to add a new config:
+ * === in CelebornConf.h:
+ *     1. define the configName with "static constexpr std::string_view";
+ *     2. declare the getter method within class;
+ * === in CelebornConf.cpp:
+ *     3. register the configName in CelebornConf's constructor, with proper
+ *        data type and proper default value;
+ *     4. implement the getter method.
+ */
+
+class CelebornConf : public BaseConf {
+ public:
+  static const std::unordered_map<std::string, folly::Optional<std::string>>
+      kDefaultProperties;
+
+  static constexpr std::string_view kRpcLookupTimeout{
+      "celeborn.rpc.lookupTimeout"};
+
+  static constexpr std::string_view kClientRpcGetReducerFileGroupRpcAskTimeout{
+      "celeborn.client.rpc.getReducerFileGroup.askTimeout"};
+
+  static constexpr std::string_view kNetworkConnectTimeout{
+      "celeborn.network.connect.timeout"};
+
+  static constexpr std::string_view kClientFetchTimeout{
+      "celeborn.client.fetch.timeout"};
+
+  static constexpr std::string_view kNetworkIoNumConnectionsPerPeer{
+      "celeborn.data.io.numConnectionsPerPeer"};
+
+  static constexpr std::string_view kNetworkIoClientThreads{
+      "celeborn.data.io.clientThreads"};
+
+  static constexpr std::string_view kClientFetchMaxReqsInFlight{
+      "celeborn.client.fetch.maxReqsInFlight"};
+
+  CelebornConf();
+
+  CelebornConf(const std::string& filename);
+
+  CelebornConf(const CelebornConf& other);
+
+  CelebornConf(CelebornConf&& other) = delete;
+
+  void registerProperty(const std::string_view& key, const std::string& value);
+
+  Timeout rpcLookupTimeout() const;
+
+  Timeout clientRpcGetReducerFileGroupRpcAskTimeout() const;
+
+  Timeout networkConnectTimeout() const;
+
+  Timeout clientFetchTimeout() const;
+
+  int networkIoNumConnectionsPerPeer() const;
+
+  int networkIoClientThreads() const;
+
+  int clientFetchMaxReqsInFlight() const;
+};
+} // namespace celeborn

cpp/celeborn/conf/tests/CMakeLists.txt

@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-add_executable(celeborn_conf_test BaseConfTest.cpp)
+add_executable(celeborn_conf_test BaseConfTest.cpp CelebornConfTest.cpp)
 
 add_test(NAME celeborn_conf_test COMMAND celeborn_conf_test)
 
@@ -26,4 +26,4 @@ target_link_libraries(
         ${GFLAGS_LIBRARIES}
         GTest::gtest
         GTest::gmock
-        GTest::gtest_main)
+        GTest::gtest_main)