Add placeholder bazel fuzzer targets. (#322)

Author: g-easy

bazel/BUILD

@@ -0,0 +1,17 @@
+# Copyright 2019, OpenCensus 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.
+
+licenses(["notice"])  # Apache 2.0
+
+package(default_visibility = ["//:__subpackages__"])

bazel/cc_fuzz_target.bzl

@@ -0,0 +1,23 @@
+# Copyright 2019, OpenCensus 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.
+"""
+Placeholder rule for fuzzing.
+
+Currently, fuzzing is done using the CMake build system.
+Please refer to ../opencensus/doc/fuzzing.md
+"""
+
+def cc_fuzz_target(name, srcs, corpus, deps):
+    """TODO: Implement."""
+    pass

opencensus/trace/BUILD

@@ -16,6 +16,7 @@
 # limitations under the License.
 
 load("//opencensus:copts.bzl", "DEFAULT_COPTS", "TEST_COPTS")
+load("//bazel:cc_fuzz_target.bzl", "cc_fuzz_target")
 
 licenses(["notice"])  # Apache 2.0
 
@@ -499,3 +500,39 @@ cc_binary(
         "@com_github_google_benchmark//:benchmark",
     ],
 )
+
+# Fuzzers
+# ========================================================================= #
+
+cc_fuzz_target(
+    name = "cloud_trace_context_fuzzer",
+    srcs = ["internal/cloud_trace_context_fuzzer.cc"],
+    corpus = glob(["internal/cloud_trace_context_corpus/*"]),
+    deps = [
+        ":cloud_trace_context",
+        ":span_context",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
+cc_fuzz_target(
+    name = "grpc_trace_bin_fuzzer",
+    srcs = ["internal/grpc_trace_bin_fuzzer.cc"],
+    corpus = glob(["internal/grpc_trace_bin_corpus/*"]),
+    deps = [
+        ":grpc_trace_bin",
+        ":span_context",
+        "@com_google_absl//absl/strings",
+    ],
+)
+
+cc_fuzz_target(
+    name = "trace_context_fuzzer",
+    srcs = ["internal/trace_context_fuzzer.cc"],
+    corpus = glob(["internal/trace_context_corpus/*"]),
+    deps = [
+        ":span_context",
+        ":trace_context",
+        "@com_google_absl//absl/strings",
+    ],
+)