Wrap Wasm related library import into a rule (#3107)

* orgnize bazel

* format

Author: bianpengyuan

Diff for: WORKSPACE

@@ -19,7 +19,7 @@ workspace(name = "io_istio_proxy")
 # http_archive is not a native function since bazel 0.19
 load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
 load(
-    "//:repositories.bzl",
+    "//bazel:repositories.bzl",
     "docker_dependencies",
     "googletest_repositories",
     "istioapi_dependencies",
@@ -134,19 +134,6 @@ container_pull(
 
 # End of docker dependencies
 
-FLAT_BUFFERS_SHA = "a83caf5910644ba1c421c002ef68e42f21c15f9f"
+load("//bazel:wasm.bzl", "wasm_dependencies")
 
-http_archive(
-    name = "com_github_google_flatbuffers",
-    sha256 = "b8efbc25721e76780752bad775a97c3f77a0250271e2db37fc747b20e8b0f24a",
-    strip_prefix = "flatbuffers-" + FLAT_BUFFERS_SHA,
-    url = "https://github.com/google/flatbuffers/archive/" + FLAT_BUFFERS_SHA + ".tar.gz",
-)
-
-http_file(
-    name = "com_github_nlohmann_json_single_header",
-    sha256 = "3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926",
-    urls = [
-        "https://github.com/nlohmann/json/releases/download/v3.7.3/json.hpp",
-    ],
-)
+wasm_dependencies()

Diff for: bazel/BUILD

@@ -0,0 +1,16 @@
+# Copyright 2020 Istio Authors. All Rights Reserved.
+#
+# 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.
+#
+################################################################################
+#

Diff for: repositories.bzl renamed to bazel/repositories.bzl

@@ -0,0 +1,36 @@
+# Copyright 2020 Google Inc. All Rights Reserved.
+#
+# 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.
+#
+################################################################################
+#
+
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive", "http_file")
+
+def wasm_dependencies():
+    FLAT_BUFFERS_SHA = "a83caf5910644ba1c421c002ef68e42f21c15f9f"
+
+    http_archive(
+        name = "com_github_google_flatbuffers",
+        sha256 = "b8efbc25721e76780752bad775a97c3f77a0250271e2db37fc747b20e8b0f24a",
+        strip_prefix = "flatbuffers-" + FLAT_BUFFERS_SHA,
+        url = "https://github.com/google/flatbuffers/archive/" + FLAT_BUFFERS_SHA + ".tar.gz",
+    )
+
+    http_file(
+        name = "com_github_nlohmann_json_single_header",
+        sha256 = "3b5d2b8f8282b80557091514d8ab97e27f9574336c804ee666fda673a9b59926",
+        urls = [
+            "https://github.com/nlohmann/json/releases/download/v3.7.3/json.hpp",
+        ],
+    )