Start libevent implementation

WORKSPACE

@@ -37,10 +37,19 @@ new_local_repository(
     path = "third_party/opentelemetry-proto",
 )
 
+http_archive(
+    name = "bazel_skylib",
+    urls = [
+        "https://github.com/bazelbuild/bazel-skylib/archive/1.0.2.zip",
+    ],
+    sha256 = "64ad2728ccdd2044216e4cec7815918b7bb3bb28c95b7e9d951f9d4eccb07625",
+    strip_prefix = "bazel-skylib-1.0.2",
+)
+
 http_archive(
    name = "rules_foreign_cc",
-   strip_prefix = "rules_foreign_cc-ed3db61a55c13da311d875460938c42ee8bbc2a5",
-   url = "https://github.com/bazelbuild/rules_foreign_cc/archive/ed3db61a55c13da311d875460938c42ee8bbc2a5.zip",
+   strip_prefix = "rules_foreign_cc-456425521973736ef346d93d3d6ba07d807047df",
+   url = "https://github.com/bazelbuild/rules_foreign_cc/archive/456425521973736ef346d93d3d6ba07d807047df.zip",
 )
 
 load("@rules_foreign_cc//:workspace_definitions.bzl", "rules_foreign_cc_dependencies")

sdk/BUILD

@@ -4,4 +4,7 @@ cc_library(
     name = "headers",
     hdrs = glob(["include/**/*.h"]),
     strip_include_prefix = "include",
+    deps = [
+        "//api",
+    ],
 )

sdk/include/opentelemetry/sdk/common/file_descriptor.h

@@ -6,12 +6,10 @@
 
 OPENTELEMETRY_BEGIN_NAMESPACE
 namespace sdk {
-namespace common {
 #ifdef _WIN32
 using FileDescriptor = intptr_t;
 #else
 using FileDescriptor = int;
 #endif
-} // namespace common
 } // namespace sdk
 OPENTELEMETRY_END_NAMESPACE

sdk/src/event/libevent/BUILD

@@ -0,0 +1,27 @@
+# Copyright 2020, OpenTelemetry Authors
+#
+# Licensed 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.
+
+package(default_visibility = ["//visibility:public"])
+
+cc_library(
+    name = "libevent",
+    srcs = glob(["**/*.cc"]),
+    hdrs = glob(["**/*.h"]),
+    include_prefix = "src/event/libevent",
+    deps = [
+        "//sdk:headers",
+        "@com_github_libevent_libevent//:libevent",
+    ],
+)
+

sdk/src/event/libevent/libevent_dispatcher.cc

@@ -0,0 +1,11 @@
+#include "src/event/libevent/libevent_dispatcher.h"
+
+#include "event2/event.h"
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace event {
+}  // namespace event
+}  // namespace sdk
+OPENTELEMETRY_END_NAMESPACE

sdk/src/event/libevent/libevent_dispatcher.h

@@ -0,0 +1,25 @@
+#pragma once
+
+#include "opentelemetry/sdk/event/dispatcher.h"
+#include "opentelemetry/version.h"
+
+OPENTELEMETRY_BEGIN_NAMESPACE
+namespace sdk
+{
+namespace event {
+class LibeventDispatcher final : public Dispatcher {
+ public:
+  // Dispatcher
+  std::unique_ptr<FileEvent> CreateFileEvent(FileDescriptor file_descriptor,
+                                                     FileReadyCallback callback,
+                                                     uint32_t events) noexcept override;
+
+  std::unique_ptr<Timer> CreateTimer(TimerCallback callback) noexcept override;
+
+  void Exit() noexcept override;
+
+  void Run() noexcept override;
+};
+}  // namespace event
+}  // namespace sdk
+OPENTELEMETRY_END_NAMESPACE