[Core Worker] implement ObjectInterface and add test framework

.travis.yml

@@ -148,6 +148,9 @@ install:
   - ./ci/suppress_output bazel build //:stats_test -c opt
   - ./bazel-bin/stats_test
 
+  # core worker test.
+  - ./ci/suppress_output bash src/ray/test/run_core_worker_tests.sh
+
   # Raylet tests.
   - ./ci/suppress_output bash src/ray/test/run_object_manager_tests.sh
   - ./ci/suppress_output bazel test --build_tests_only --test_lang_filters=cc //:all

BUILD.bazel

@@ -77,6 +77,7 @@ cc_library(
             "src/ray/raylet/mock_gcs_client.cc",
             "src/ray/raylet/monitor_main.cc",
             "src/ray/raylet/*_test.cc",
+            "src/ray/raylet/main.cc",
         ],
     ),
     hdrs = glob([
@@ -122,15 +123,18 @@ cc_library(
     deps = [
         ":ray_common",
         ":ray_util",
+        ":raylet_lib",
     ],
 )
 
-cc_test(
+# This test is run by src/ray/test/run_core_worker_tests.sh
+cc_binary(
     name = "core_worker_test",
     srcs = ["src/ray/core_worker/core_worker_test.cc"],
     copts = COPTS,
     deps = [
         ":core_worker_lib",
+        ":gcs",
         "@com_google_googletest//:gtest_main",
     ],
 )
@@ -320,6 +324,7 @@ cc_library(
         ":node_manager_fbs",
         ":ray_util",
         "@boost//:asio",
+        "@plasma//:plasma_client",
     ],
 )
 

src/ray/common/buffer.h

@@ -3,6 +3,11 @@
 
 #include <cstdint>
 #include <cstdio>
+#include "plasma/client.h"
+
+namespace arrow {
+class Buffer;
+}
 
 namespace ray {
 
@@ -15,7 +20,7 @@ class Buffer {
   /// Size of this buffer.
   virtual size_t Size() const = 0;
 
-  virtual ~Buffer() {}
+  virtual ~Buffer(){};
 
   bool operator==(const Buffer &rhs) const {
     return this->Data() == rhs.Data() && this->Size() == rhs.Size();
@@ -40,6 +45,21 @@ class LocalMemoryBuffer : public Buffer {
   size_t size_;
 };
 
+/// Represents a byte buffer for plasma object.
+class PlasmaBuffer : public Buffer {
+ public:
+  PlasmaBuffer(std::shared_ptr<arrow::Buffer> buffer) : buffer_(buffer) {}
+
+  uint8_t *Data() const override { return const_cast<uint8_t *>(buffer_->data()); }
+
+  size_t Size() const override { return buffer_->size(); }
+
+ private:
+  /// shared_ptr to arrow buffer which can potentially hold a reference
+  /// for the object (when it's a plasma::PlasmaBuffer).
+  std::shared_ptr<arrow::Buffer> buffer_;
+};
+
 }  // namespace ray
 
 #endif  // RAY_COMMON_BUFFER_H

src/ray/core_worker/common.h

@@ -45,13 +45,13 @@ class TaskArg {
   bool IsPassedByReference() const { return id_ != nullptr; }
 
   /// Get the reference object ID.
-  ObjectID &GetReference() {
+  const ObjectID &GetReference() const {
     RAY_CHECK(id_ != nullptr) << "This argument isn't passed by reference.";
     return *id_;
   }
 
   /// Get the value.
-  std::shared_ptr<Buffer> GetValue() {
+  std::shared_ptr<Buffer> GetValue() const {
     RAY_CHECK(data_ != nullptr) << "This argument isn't passed by value.";
     return data_;
   }

src/ray/core_worker/context.cc

@@ -0,0 +1,81 @@
+
+#include "context.h"
+
+namespace ray {
+
+/// per-thread context for core worker.
+struct WorkerThreadContext {
+  WorkerThreadContext()
+      : current_task_id(TaskID::FromRandom()), task_index(0), put_index(0) {}
+
+  int GetNextTaskIndex() { return ++task_index; }
+
+  int GetNextPutIndex() { return ++put_index; }
+
+  const TaskID &GetCurrentTaskID() const { return current_task_id; }
+
+  void SetCurrentTask(const TaskID &task_id) {
+    current_task_id = task_id;
+    task_index = 0;
+    put_index = 0;
+  }
+
+  void SetCurrentTask(const raylet::TaskSpecification &spec) {
+    SetCurrentTask(spec.TaskId());
+  }
+
+ private:
+  /// The task ID for current task.
+  TaskID current_task_id;
+
+  /// Number of tasks that have been submitted from current task.
+  int task_index;
+
+  /// Number of objects that have been put from current task.
+  int put_index;
+};
+
+thread_local std::unique_ptr<WorkerThreadContext> WorkerContext::thread_context_ =
+    nullptr;
+
+WorkerContext::WorkerContext(WorkerType worker_type, const DriverID &driver_id)
+    : worker_type(worker_type),
+      worker_id(worker_type == WorkerType::DRIVER
+                    ? ClientID::FromBinary(driver_id.Binary())
+                    : ClientID::FromRandom()),
+      current_driver_id(worker_type == WorkerType::DRIVER ? driver_id : DriverID::Nil()) {
+  // For worker main thread which initializes the WorkerContext,
+  // set task_id according to whether current worker is a driver.
+  // (For other threads it's set to randmom ID via GetThreadContext).
+  GetThreadContext().SetCurrentTask(
+      (worker_type == WorkerType::DRIVER) ? TaskID::FromRandom() : TaskID::Nil());
+}
+
+const WorkerType WorkerContext::GetWorkerType() const { return worker_type; }
+
+const ClientID &WorkerContext::GetWorkerID() const { return worker_id; }
+
+int WorkerContext::GetNextTaskIndex() { return GetThreadContext().GetNextTaskIndex(); }
+
+int WorkerContext::GetNextPutIndex() { return GetThreadContext().GetNextPutIndex(); }
+
+const DriverID &WorkerContext::GetCurrentDriverID() const { return current_driver_id; }
+
+const TaskID &WorkerContext::GetCurrentTaskID() const {
+  return GetThreadContext().GetCurrentTaskID();
+}
+
+void WorkerContext::SetCurrentTask(const raylet::TaskSpecification &spec) {
+  current_driver_id = spec.DriverId();
+  GetThreadContext().SetCurrentTask(spec);
+}
+
+WorkerThreadContext &WorkerContext::GetThreadContext() {
+  if (thread_context_ == nullptr) {
+    thread_context_ = std::unique_ptr<WorkerThreadContext>(new WorkerThreadContext());
+  }
+
+  return *thread_context_;
+}
+
+}  // namespace ray

src/ray/core_worker/context.h

@@ -0,0 +1,48 @@
+#ifndef RAY_CORE_WORKER_CONTEXT_H
+#define RAY_CORE_WORKER_CONTEXT_H
+
+#include "common.h"
+#include "ray/raylet/task_spec.h"
+
+namespace ray {
+
+struct WorkerThreadContext;
+
+class WorkerContext {
+ public:
+  WorkerContext(WorkerType worker_type, const DriverID &driver_id);
+
+  const WorkerType GetWorkerType() const;
+
+  const ClientID &GetWorkerID() const;
+
+  const DriverID &GetCurrentDriverID() const;
+
+  const TaskID &GetCurrentTaskID() const;
+
+  void SetCurrentTask(const raylet::TaskSpecification &spec);
+
+  int GetNextTaskIndex();
+
+  int GetNextPutIndex();
+
+ private:
+  /// Type of the worker.
+  const WorkerType worker_type;
+
+  /// ID for this worker.
+  const ClientID worker_id;
+
+  /// Driver ID for this worker.
+  DriverID current_driver_id;
+
+ private:
+  static WorkerThreadContext &GetThreadContext();
+
+  /// Per-thread worker context.
+  static thread_local std::unique_ptr<WorkerThreadContext> thread_context_;
+};
+
+}  // namespace ray
+
+#endif  // RAY_CORE_WORKER_CONTEXT_H

src/ray/core_worker/core_worker.cc

@@ -0,0 +1,39 @@
+#include "core_worker.h"
+#include "context.h"
+
+namespace ray {
+
+CoreWorker::CoreWorker(const enum WorkerType worker_type, const enum Language language,
+                       const std::string &store_socket, const std::string &raylet_socket,
+                       DriverID driver_id)
+    : worker_type_(worker_type),
+      language_(language),
+      worker_context_(worker_type, driver_id),
+      store_socket_(store_socket),
+      raylet_socket_(raylet_socket),
+      task_interface_(*this),
+      object_interface_(*this),
+      task_execution_interface_(*this) {}
+
+Status CoreWorker::Connect() {
+  // connect to plasma.
+  RAY_ARROW_RETURN_NOT_OK(store_client_.Connect(store_socket_));
+
+  // connect to raylet.
+  ::Language lang = ::Language::PYTHON;
+  if (language_ == ray::Language::JAVA) {
+    lang = ::Language::JAVA;
+  }
+
+  // TODO: currently RayletClient would crash in its constructor if it cannot
+  // connect to Raylet after a number of retries, this needs to be changed
+  // so that the worker (java/python .etc) can retrieve and handle the error
+  // instead of crashing.
+  raylet_client_ = std::unique_ptr<RayletClient>(
+      new RayletClient(raylet_socket_, worker_context_.GetWorkerID(),
+                       (worker_type_ == ray::WorkerType::WORKER),
+                       worker_context_.GetCurrentDriverID(), lang));
+  return Status::OK();
+}
+
+}  // namespace ray

src/ray/core_worker/core_worker.h

@@ -2,8 +2,10 @@
 #define RAY_CORE_WORKER_CORE_WORKER_H
 
 #include "common.h"
+#include "context.h"
 #include "object_interface.h"
 #include "ray/common/buffer.h"
+#include "ray/raylet/raylet_client.h"
 #include "task_execution.h"
 #include "task_interface.h"
 
@@ -18,15 +20,12 @@ class CoreWorker {
   ///
   /// \param[in] worker_type Type of this worker.
   /// \param[in] langauge Language of this worker.
-  CoreWorker(const WorkerType worker_type, const Language language)
-      : worker_type_(worker_type),
-        language_(language),
-        task_interface_(*this),
-        object_interface_(*this),
-        task_execution_interface_(*this) {}
+  CoreWorker(const WorkerType worker_type, const Language language,
+             const std::string &store_socket, const std::string &raylet_socket,
+             DriverID driver_id = DriverID::Nil());
 
-  /// Connect this worker to Raylet.
-  Status Connect() { return Status::OK(); }
+  /// Connect to raylet.
+  Status Connect();
 
   /// Type of this worker.
   enum WorkerType WorkerType() const { return worker_type_; }
@@ -53,6 +52,21 @@ class CoreWorker {
   /// Language of this worker.
   const enum Language language_;
 
+  /// Worker context per thread.
+  WorkerContext worker_context_;
+
+  /// Plasma store socket name.
+  std::string store_socket_;
+
+  /// raylet socket name.
+  std::string raylet_socket_;
+
+  /// Plasma store client.
+  plasma::PlasmaClient store_client_;
+
+  /// Raylet client.
+  std::unique_ptr<RayletClient> raylet_client_;
+
   /// The `CoreWorkerTaskInterface` instance.
   CoreWorkerTaskInterface task_interface_;
 
@@ -61,6 +75,10 @@ class CoreWorker {
 
   /// The `CoreWorkerTaskExecutionInterface` instance.
   CoreWorkerTaskExecutionInterface task_execution_interface_;
+
+  friend class CoreWorkerTaskInterface;
+  friend class CoreWorkerObjectInterface;
+  friend class CoreWorkerTaskExecutionInterface;
 };
 
 }  // namespace ray