Manage grpc dependency in Bazel's WORKSPACE file. (#5995)

flatbuffers project currently depends on an old version of GRPC library and has known issues working with the latest version (issue #5836). Therefore, a patch file is created and put under bazel/ directory before supporting the latest GRPC version.

WORKSPACE

@@ -16,3 +16,19 @@ load("@io_bazel_rules_go//go:deps.bzl", "go_rules_dependencies", "go_register_to
 go_rules_dependencies()
 
 go_register_toolchains()
+
+
+##### GRPC
+_GRPC_VERSION = "1.15.1"
+
+http_archive(
+    name = "com_github_grpc_grpc",
+    patches = ["//bazel:grpc_deps_1_15_1.patch"],
+    patch_args = ["-p1"],
+    strip_prefix = "grpc-" + _GRPC_VERSION,
+    urls = ["https://github.com/grpc/grpc/archive/v" + _GRPC_VERSION + ".tar.gz"],
+)
+
+load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")
+
+grpc_deps()

bazel/grpc_deps_1_15_1.patch

@@ -0,0 +1,155 @@
+diff --git a/bazel/grpc_deps.bzl b/bazel/grpc_deps.bzl
+index 4096720569..ea411b577d 100644
+--- a/bazel/grpc_deps.bzl
++++ b/bazel/grpc_deps.bzl
+@@ -1,5 +1,10 @@
+ """Load dependencies needed to compile and test the grpc library as a 3rd-party consumer."""
+ 
++# native.http_archive has been deprecated in newer bazel version. In order to work with
++# grpc 1.15.1, the version flatbuffers is currently replying on. We need to apply this patch
++# when importing the grpc dependency.
++load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
++
+ def grpc_deps():
+     """Loads dependencies need to compile and test the grpc library."""
+ 
+@@ -99,14 +104,14 @@ def grpc_deps():
+     )
+ 
+     if "boringssl" not in native.existing_rules():
+-        native.http_archive(
++        http_archive(
+             name = "boringssl",
+             # on the chromium-stable-with-bazel branch
+             url = "https://boringssl.googlesource.com/boringssl/+archive/dcd3e6e6ecddf059adb48fca45bc7346a108bdd9.tar.gz",
+         )
+ 
+     if "com_github_madler_zlib" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_madler_zlib",
+             build_file = "@com_github_grpc_grpc//third_party:zlib.BUILD",
+             strip_prefix = "zlib-cacf7f1d4e3d44d871b605da3b647f07d718623f",
+@@ -114,14 +119,14 @@ def grpc_deps():
+         )
+ 
+     if "com_google_protobuf" not in native.existing_rules():
+-        native.http_archive(
++        http_archive(
+             name = "com_google_protobuf",
+             strip_prefix = "protobuf-48cb18e5c419ddd23d9badcfe4e9df7bde1979b2",
+             url = "https://github.com/google/protobuf/archive/48cb18e5c419ddd23d9badcfe4e9df7bde1979b2.tar.gz",
+         )
+ 
+     if "com_github_nanopb_nanopb" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_nanopb_nanopb",
+             build_file = "@com_github_grpc_grpc//third_party:nanopb.BUILD",
+             strip_prefix = "nanopb-f8ac463766281625ad710900479130c7fcb4d63b",
+@@ -129,7 +134,7 @@ def grpc_deps():
+         )
+ 
+     if "com_github_google_googletest" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_google_googletest",
+             build_file = "@com_github_grpc_grpc//third_party:gtest.BUILD",
+             strip_prefix = "googletest-ec44c6c1675c25b9827aacd08c02433cccde7780",
+@@ -137,14 +142,14 @@ def grpc_deps():
+         )
+ 
+     if "com_github_gflags_gflags" not in native.existing_rules():
+-        native.http_archive(
++        http_archive(
+             name = "com_github_gflags_gflags",
+             strip_prefix = "gflags-30dbc81fb5ffdc98ea9b14b1918bfe4e8779b26e",
+             url = "https://github.com/gflags/gflags/archive/30dbc81fb5ffdc98ea9b14b1918bfe4e8779b26e.tar.gz",
+         )
+ 
+     if "com_github_google_benchmark" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_google_benchmark",
+             build_file = "@com_github_grpc_grpc//third_party:benchmark.BUILD",
+             strip_prefix = "benchmark-9913418d323e64a0111ca0da81388260c2bbe1e9",
+@@ -152,7 +157,7 @@ def grpc_deps():
+         )
+ 
+     if "com_github_cares_cares" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_cares_cares",
+             build_file = "@com_github_grpc_grpc//third_party:cares/cares.BUILD",
+             strip_prefix = "c-ares-3be1924221e1326df520f8498d704a5c4c8d0cce",
+@@ -160,14 +165,14 @@ def grpc_deps():
+         )
+ 
+     if "com_google_absl" not in native.existing_rules():
+-        native.http_archive(
++        http_archive(
+             name = "com_google_absl",
+             strip_prefix = "abseil-cpp-cd95e71df6eaf8f2a282b1da556c2cf1c9b09207",
+             url = "https://github.com/abseil/abseil-cpp/archive/cd95e71df6eaf8f2a282b1da556c2cf1c9b09207.tar.gz",
+         )
+ 
+     if "com_github_bazelbuild_bazeltoolchains" not in native.existing_rules():
+-        native.http_archive(
++        http_archive(
+             name = "com_github_bazelbuild_bazeltoolchains",
+             strip_prefix = "bazel-toolchains-cdea5b8675914d0a354d89f108de5d28e54e0edc",
+             urls = [
+@@ -178,7 +183,7 @@ def grpc_deps():
+         )
+ 
+     if "io_opencensus_cpp" not in native.existing_rules():
+-      native.http_archive(
++      http_archive(
+             name = "io_opencensus_cpp",
+             strip_prefix = "opencensus-cpp-fdf0f308b1631bb4a942e32ba5d22536a6170274",
+             url = "https://github.com/census-instrumentation/opencensus-cpp/archive/fdf0f308b1631bb4a942e32ba5d22536a6170274.tar.gz",
+@@ -200,7 +205,7 @@ def grpc_test_only_deps():
+     )
+ 
+     if "com_github_twisted_twisted" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_twisted_twisted",
+             strip_prefix = "twisted-twisted-17.5.0",
+             url = "https://github.com/twisted/twisted/archive/twisted-17.5.0.zip",
+@@ -208,7 +213,7 @@ def grpc_test_only_deps():
+         )
+ 
+     if "com_github_yaml_pyyaml" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_yaml_pyyaml",
+             strip_prefix = "pyyaml-3.12",
+             url = "https://github.com/yaml/pyyaml/archive/3.12.zip",
+@@ -216,7 +221,7 @@ def grpc_test_only_deps():
+         )
+ 
+     if "com_github_twisted_incremental" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_twisted_incremental",
+             strip_prefix = "incremental-incremental-17.5.0",
+             url = "https://github.com/twisted/incremental/archive/incremental-17.5.0.zip",
+@@ -224,7 +229,7 @@ def grpc_test_only_deps():
+         )
+ 
+     if "com_github_zopefoundation_zope_interface" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_zopefoundation_zope_interface",
+             strip_prefix = "zope.interface-4.4.3",
+             url = "https://github.com/zopefoundation/zope.interface/archive/4.4.3.zip",
+@@ -232,7 +237,7 @@ def grpc_test_only_deps():
+         )
+ 
+     if "com_github_twisted_constantly" not in native.existing_rules():
+-        native.new_http_archive(
++        http_archive(
+             name = "com_github_twisted_constantly",
+             strip_prefix = "constantly-15.1.0",
+             url = "https://github.com/twisted/constantly/archive/15.1.0.zip",