Add snowflake id

src/clients/meta/MetaClient.cpp

@@ -694,6 +694,7 @@ void MetaClient::getResponse(Request req,
                   return;
                 } else {
                   LOG(ERROR) << "Send request to " << host << ", exceed retry limit";
+                  LOG(ERROR) << "RpcResponse exception: " << t.exception().what().c_str();
                   pro.setValue(
                       Status::Error("RPC failure in MetaClient: %s", t.exception().what().c_str()));
                 }
@@ -3501,6 +3502,21 @@ folly::Future<StatusOr<cpp2::ExecResp>> MetaClient::killQuery(
   return future;
 }
 
+folly::Future<StatusOr<int64_t>> MetaClient::getWorkerId(std::string ipAddr) {
+  cpp2::GetWorkerIdReq req;
+  req.host_ref() = std::move(ipAddr);
+
+  folly::Promise<StatusOr<int64_t>> promise;
+  auto future = promise.getFuture();
+  getResponse(
+      std::move(req),
+      [](auto client, auto request) { return client->future_getWorkerId(request); },
+      [](cpp2::GetWorkerIdResp&& resp) -> int64_t { return std::move(resp).get_workerid(); },
+      std::move(promise),
+      true);
+  return future;
+}
+
 folly::Future<StatusOr<bool>> MetaClient::download(const std::string& hdfsHost,
                                                    int32_t hdfsPort,
                                                    const std::string& hdfsPath,

src/clients/meta/MetaClient.h

@@ -644,6 +644,8 @@ class MetaClient {
 
   folly::Future<StatusOr<bool>> ingest(GraphSpaceID spaceId);
 
+  folly::Future<StatusOr<int64_t>> getWorkerId(std::string ipAddr);
+
   HostAddr getMetaLeader() {
     return leader_;
   }
@@ -652,6 +654,10 @@ class MetaClient {
     return heartbeatTime_;
   }
 
+  std::string getLocalIp() {
+    return options_.localHost_.toString();
+  }
+
  protected:
   // Return true if load succeeded.
   bool loadData();

src/common/CMakeLists.txt

@@ -27,3 +27,4 @@ nebula_add_subdirectory(utils)
 nebula_add_subdirectory(ssl)
 nebula_add_subdirectory(geo)
 nebula_add_subdirectory(memory)
+nebula_add_subdirectory(id)

src/common/expression/UUIDExpression.cpp

@@ -10,36 +10,26 @@
 namespace nebula {
 
 bool UUIDExpression::operator==(const Expression& rhs) const {
-  if (kind_ != rhs.kind()) {
-    return false;
-  }
-
-  const auto& r = static_cast<const UUIDExpression&>(rhs);
-  return field_ == r.field_;
+  return kind_ == rhs.kind();
 }
 
 void UUIDExpression::writeTo(Encoder& encoder) const {
   // kind_
+  UNUSED(encoder);
   encoder << kind_;
-
-  // field_
-  CHECK(!field_.empty());
-  encoder << field_;
 }
 
 void UUIDExpression::resetFrom(Decoder& decoder) {
-  // Read field_
-  field_ = decoder.readStr();
+  UNUSED(decoder);
 }
 
 const Value& UUIDExpression::eval(ExpressionContext& ctx) {
-  // TODO
   UNUSED(ctx);
   return result_;
 }
 
 std::string UUIDExpression::toString() const {
-  return folly::stringPrintf("uuid(\"%s\")", field_.c_str());
+  return folly::stringPrintf("uuid()");
 }
 
 void UUIDExpression::accept(ExprVisitor* visitor) {

src/common/expression/UUIDExpression.h

@@ -14,8 +14,8 @@ class UUIDExpression final : public Expression {
   friend class Expression;
 
  public:
-  static UUIDExpression* make(ObjectPool* pool, const std::string& field = "") {
-    return pool->add(new UUIDExpression(pool, field));
+  static UUIDExpression* make(ObjectPool* pool) {
+    return pool->add(new UUIDExpression(pool));
   }
 
   bool operator==(const Expression& rhs) const override;
@@ -27,18 +27,16 @@ class UUIDExpression final : public Expression {
   void accept(ExprVisitor* visitor) override;
 
   Expression* clone() const override {
-    return UUIDExpression::make(pool_, field_);
+    return UUIDExpression::make(pool_);
   }
 
  private:
-  explicit UUIDExpression(ObjectPool* pool, const std::string& field = "")
-      : Expression(pool, Kind::kUUID), field_(field) {}
+  explicit UUIDExpression(ObjectPool* pool) : Expression(pool, Kind::kUUID) {}
 
   void writeTo(Encoder& encoder) const override;
   void resetFrom(Decoder& decoder) override;
 
  private:
-  std::string field_;
   Value result_;
 };
 

src/common/expression/test/EncodeDecodeTest.cpp

@@ -205,7 +205,7 @@ TEST(ExpressionEncodeDecode, TypeCastingExpression) {
 }
 
 TEST(ExpressionEncodeDecode, UUIDExpression) {
-  const auto& uuidEx = *UUIDExpression::make(&pool, "field");
+  const auto& uuidEx = *UUIDExpression::make(&pool);
   std::string encoded = Expression::encode(uuidEx);
   auto decoded = Expression::decode(&pool, folly::StringPiece(encoded.data(), encoded.size()));
   EXPECT_EQ(uuidEx, *decoded);

src/common/expression/test/ExpressionTest.cpp

@@ -142,7 +142,7 @@ TEST_F(ExpressionTest, TestExprClone) {
   auto fnCallExpr = FunctionCallExpression::make(&pool, "count", ArgumentList::make(&pool));
   ASSERT_EQ(*fnCallExpr, *fnCallExpr->clone());
 
-  auto uuidExpr = UUIDExpression::make(&pool, "hello");
+  auto uuidExpr = UUIDExpression::make(&pool);
   ASSERT_EQ(*uuidExpr, *uuidExpr->clone());
 
   auto subExpr = SubscriptExpression::make(

src/common/id/CMakeLists.txt

@@ -0,0 +1,11 @@
+# Copyright (c) 2021 vesoft inc. All rights reserved.
+#
+# This source code is licensed under Apache 2.0 License,
+# attached with Common Clause Condition 1.0, found in the LICENSES directory.
+
+nebula_add_library(
+    snowflake_obj OBJECT
+    Snowflake.cpp
+)
+
+nebula_add_subdirectory(test)

src/common/id/Snowflake.cpp

@@ -0,0 +1,64 @@
+/* Copyright (c) 2021 vesoft inc. All rights reserved.
+ *
+ * This source code is licensed under Apache 2.0 License.
+ */
+
+#include "common/id/Snowflake.h"
+
+namespace nebula {
+void Snowflake::initWorkerId(meta::MetaClient* client) {
+  const std::string& ip = client->getLocalIp();
+  auto result = client->getWorkerId(ip).get();
+  if (!result.ok()) {
+    LOG(FATAL) << "Failed to get workerId from meta server";
+  }
+  workerId_ = result.value();
+  LOG(INFO) << "WorkerId init success: " << workerId_;
+}
+
+int64_t Snowflake::getId() {
+  std::lock_guard<std::mutex> guard(mutex_);
+
+  int64_t timestamp = getTimestamp();
+  if (timestamp < lastTimestamp_) {
+    LOG(ERROR) << "Clock back";
+    return firstBitRevert & getIdByTs(timestamp);
+  }
+
+  return getIdByTs(timestamp);
+}
+
+// get snowflake id by timestamp
+// update lastTimestamp_ or sequence_
+int64_t Snowflake::getIdByTs(int64_t timestamp) {
+  // if it is the same time, then the microsecond sequence
+  if (lastTimestamp_ == timestamp) {
+    sequence_ = (sequence_ + 1) & maxSequence;
+    // if the microsecond sequence overflow
+    if (sequence_ == 0) {
+      // block to the next millisecond, get the new timestamp
+      timestamp = nextTimestamp();
+    }
+  } else {
+    lastTimestamp_ = timestamp;
+    sequence_ = 0;
+  }
+  return (timestamp - startStmp) << timestampLeft | workerId_ << workerIdLeft | sequence_;
+}
+
+int64_t Snowflake::getTimestamp() {
+  return std::chrono::duration_cast<std::chrono::milliseconds>(
+             std::chrono::system_clock::now().time_since_epoch())
+      .count();
+}
+
+// wait for the next millisecond
+int64_t Snowflake::nextTimestamp() {
+  int64_t timestamp = getTimestamp();
+  while (timestamp <= lastTimestamp_) {
+    timestamp = getTimestamp();
+  }
+  return timestamp;
+}
+
+}  // namespace nebula

src/common/id/Snowflake.h

@@ -0,0 +1,62 @@
+/* Copyright (c) 2021 vesoft inc. All rights reserved.
+ *
+ * This source code is licensed under Apache 2.0 License.
+ */
+
+#ifndef COMMON_ID_SNOWFLAKE_H_
+#define COMMON_ID_SNOWFLAKE_H_
+
+#include "clients/meta/MetaClient.h"
+#include "common/base/Base.h"
+
+namespace nebula {
+class Snowflake {
+  FRIEND_TEST(SnowflakeTest, TestWorkerId);
+  FRIEND_TEST(SnowflakeTest, TestConcurrency);
+  friend size_t SnowflakeTest(size_t iters);
+  friend int64_t getSequence(int64_t id);
+  friend int64_t getWorkerId(int64_t id);
+  friend int64_t getTimestamp(int64_t id);
+
+ public:
+  Snowflake() = default;
+
+  static void initWorkerId(meta::MetaClient* client);
+
+  int64_t getId();
+
+ private:
+  static int64_t getTimestamp();
+
+  int64_t nextTimestamp();
+
+  int64_t getIdByTs(int64_t timestamp);
+
+  std::mutex mutex_;
+
+  /*
+   *  Snowflake id:
+   *  timestampBit 38 bits (8.6 years) |
+   *  workerBit 13 bits (8k workerid) |
+   *  sequenceBit 12 bits (4 million per second) |
+   */
+  int64_t lastTimestamp_{-1};
+  static inline int64_t workerId_{0};
+  int64_t sequence_{0};
+
+  static constexpr int64_t startStmp = 1577808000000;  // start time: 2020-01-01 00:00:00
+  static constexpr int64_t workerBit = 13;             // worker id bit
+  static constexpr int64_t sequenceBit = 12;           // sequence bit
+
+  static constexpr int64_t maxWorkerId = (1 << workerBit) - 1;  // as worker id mask
+  static constexpr int64_t maxSequence = (1 << sequenceBit) - 1;
+
+  static constexpr int64_t workerIdLeft = sequenceBit;  // workerId left bits
+  static constexpr int64_t timestampLeft = sequenceBit + workerBit;
+
+  static constexpr int64_t firstBitRevert = 0x9000000000000000;  // revert the first bit
+};
+
+}  // namespace nebula
+
+#endif  // COMMON_ID_SNOWFLAKE_H_

src/common/id/test/CMakeLists.txt

@@ -0,0 +1,80 @@
+# Copyright (c) 2021 vesoft inc. All rights reserved.
+#
+# This source code is licensed under Apache 2.0 License,
+
+nebula_add_executable(
+    NAME snowflake_bm
+    SOURCES SnowflakeBenchmark.cpp
+    OBJECTS 
+      $<TARGET_OBJECTS:base_obj>
+      $<TARGET_OBJECTS:snowflake_obj>
+      $<TARGET_OBJECTS:meta_client_obj>
+      $<TARGET_OBJECTS:http_client_obj>
+      $<TARGET_OBJECTS:thrift_obj>
+      $<TARGET_OBJECTS:meta_obj>
+      $<TARGET_OBJECTS:ssl_obj>
+      $<TARGET_OBJECTS:conf_obj>
+      $<TARGET_OBJECTS:ws_obj>
+      $<TARGET_OBJECTS:ws_common_obj>
+      $<TARGET_OBJECTS:process_obj>
+      $<TARGET_OBJECTS:thread_obj>
+      $<TARGET_OBJECTS:version_obj>
+      $<TARGET_OBJECTS:file_based_cluster_id_man_obj>
+      $<TARGET_OBJECTS:meta_thrift_obj>
+      $<TARGET_OBJECTS:common_thrift_obj>
+      $<TARGET_OBJECTS:stats_obj>
+      $<TARGET_OBJECTS:datatypes_obj>
+      $<TARGET_OBJECTS:wkt_wkb_io_obj>
+      $<TARGET_OBJECTS:function_manager_obj>
+      $<TARGET_OBJECTS:agg_function_manager_obj>
+      $<TARGET_OBJECTS:time_utils_obj>
+      $<TARGET_OBJECTS:datetime_parser_obj>
+      $<TARGET_OBJECTS:time_obj>
+      $<TARGET_OBJECTS:fs_obj>
+      $<TARGET_OBJECTS:meta_client_stats_obj>
+      $<TARGET_OBJECTS:expression_obj>
+    LIBRARIES
+      follybenchmark 
+      boost_regex
+      ${PROXYGEN_LIBRARIES}
+      ${THRIFT_LIBRARIES}
+)
+
+
+nebula_add_test(
+  NAME snowflake_test
+  SOURCES SnowflakeTest.cpp
+  OBJECTS
+    $<TARGET_OBJECTS:base_obj>
+    $<TARGET_OBJECTS:snowflake_obj>
+    $<TARGET_OBJECTS:meta_client_obj>
+    $<TARGET_OBJECTS:http_client_obj>
+    $<TARGET_OBJECTS:thrift_obj>
+    $<TARGET_OBJECTS:meta_obj>
+    $<TARGET_OBJECTS:ssl_obj>
+    $<TARGET_OBJECTS:conf_obj>
+    $<TARGET_OBJECTS:ws_obj>
+    $<TARGET_OBJECTS:ws_common_obj>
+    $<TARGET_OBJECTS:process_obj>
+    $<TARGET_OBJECTS:thread_obj>
+    $<TARGET_OBJECTS:version_obj>
+    $<TARGET_OBJECTS:file_based_cluster_id_man_obj>
+    $<TARGET_OBJECTS:meta_thrift_obj>
+    $<TARGET_OBJECTS:common_thrift_obj>
+    $<TARGET_OBJECTS:stats_obj>
+    $<TARGET_OBJECTS:datatypes_obj>
+    $<TARGET_OBJECTS:wkt_wkb_io_obj>
+    $<TARGET_OBJECTS:function_manager_obj>
+    $<TARGET_OBJECTS:agg_function_manager_obj>
+    $<TARGET_OBJECTS:time_utils_obj>
+    $<TARGET_OBJECTS:datetime_parser_obj>
+    $<TARGET_OBJECTS:time_obj>
+    $<TARGET_OBJECTS:fs_obj>
+    $<TARGET_OBJECTS:meta_client_stats_obj>
+    $<TARGET_OBJECTS:expression_obj>
+  LIBRARIES 
+    gtest 
+    gtest_main
+    ${PROXYGEN_LIBRARIES}
+    ${THRIFT_LIBRARIES}
+)