chore: re-work Bazel build to accommodate Maven setup (#936)

BUILD.bazel

@@ -47,14 +47,24 @@ TEST_DEPS = [
     "@io_github_java_diff_utils//jar",
 ]
 
+proto_library(
+    name = "service_config_proto",
+    srcs = ["src/main/proto/service_config.proto"],
+    deps = [
+        "@com_google_googleapis//google/rpc:code_proto",
+        "@com_google_protobuf//:duration_proto",
+        "@com_google_protobuf//:wrappers_proto",
+        "@com_google_protobuf//:struct_proto",
+    ],
+)
 java_proto_library(
     name = "service_config_java_proto",
-    deps = ["@io_grpc_proto//:service_config_proto"],
+    deps = [":service_config_proto"],
 )
 
 proto_library(
     name = "test_protos",
-    srcs = glob(["src/test/resources/*.proto"]),
+    srcs = glob(["src/test/proto/*.proto"]),
     deps = [
         "@com_google_googleapis//google/api:annotations_proto",
         "@com_google_googleapis//google/api:client_proto",
@@ -85,14 +95,25 @@ java_plugin(
     deps = ["@com_google_auto_value_auto_value//jar"],
 )
 
-java_binary(
-    name = "protoc-gen-java_gapic",
+java_library(
+    name = "gapic_generator_java",
     srcs = glob(["src/main/java/**/*.java"]),
-    main_class = "com.google.api.generator.Main",
     plugins = [":autovalue_plugin"],
     deps = MAIN_DEPS,
 )
 
+java_library(
+    name = "gapic_generator_java_test",
+    srcs = glob(["src/test/java/**/*.java"]),
+    deps = [":gapic_generator_java"] + MAIN_DEPS + TEST_DEPS,
+)
+
+java_binary(
+    name = "protoc-gen-java_gapic",
+    main_class = "com.google.api.generator.Main",
+    runtime_deps = [":gapic_generator_java"] + MAIN_DEPS,
+)
+
 # Request dumper binary, which dumps the CodeGeneratorRequest to a file on disk
 # which will be identical to the one passed to the protoc-gen-java_gapic during
 # normal execution. The dumped file then can be used to run this gapic-generator
@@ -112,7 +133,7 @@ java_binary(
 java_binary(
     name = "protoc-gen-code_generator_request_dumper",
     main_class = "com.google.api.generator.debug.CodeGeneratorRequestDumper",
-    runtime_deps = [":protoc-gen-java_gapic"] + MAIN_DEPS + MAIN_DEPS_DEBUG_RUNTIME_ONLY,
+    runtime_deps = [":gapic_generator_java"] + MAIN_DEPS + MAIN_DEPS_DEBUG_RUNTIME_ONLY,
 )
 
 # A binary similar to protoc-gen-java_gapic but reads the CodeGeneratorRequest
@@ -125,14 +146,14 @@ java_binary(
 java_binary(
     name = "code_generator_request_file_to_gapic_main",
     main_class = "com.google.api.generator.debug.CodeGeneratorRequestFileToGapicMain",
-    runtime_deps = [":protoc-gen-java_gapic"] + MAIN_DEPS + MAIN_DEPS_DEBUG_RUNTIME_ONLY,
+    runtime_deps = [":gapic_generator_java"] + MAIN_DEPS + MAIN_DEPS_DEBUG_RUNTIME_ONLY,
 )
 
 # another test resource
 genrule(
     name = "basic_proto_descriptor",
-    srcs = ["src/test/resources/basic.proto"],
-    outs = ["basic_proto.descriptor"],
+    srcs = ["src/test/proto/basic.proto"],
+    outs = ["test-proto.descriptorset"],
     cmd = "$(location @com_google_protobuf//:protoc) " +
           "--include_source_info --include_imports --descriptor_set_out=$(OUTS) $(SRCS)",
     message = "Generating proto descriptor",
@@ -143,9 +164,11 @@ genrule(
 # bazel test //:unit_com_google_api_generator_engine_JavaCodeGeneratorTest
 [java_test(
     name = "unit_" + file[14:-5].replace('/', '_'),
-    srcs = glob(["src/test/java/**/*.java"]),
     test_class = file[14:-5].replace('/', '.'),
-    deps = [":protoc-gen-java_gapic"] + MAIN_DEPS + TEST_DEPS,
+    runtime_deps = [
+        ":gapic_generator_java",
+        ":gapic_generator_java_test",
+    ] + MAIN_DEPS + TEST_DEPS,
     data = [":basic_proto_descriptor"] + glob([
         "src/test/java/**/*.golden",
         "src/test/resources/**",
@@ -182,10 +205,12 @@ GOLDEN_UPDATING_UNIT_TESTS = [
 # bazel run //:update_com_google_api_generator_engine_JavaCodeGeneratorTest
 [java_binary(
     name = "update_%s" % test_class.replace('.', '_'),
-    srcs = glob(["src/test/java/**/*.java"]),
     main_class = "com.google.api.generator.test.framework.SingleJUnitTestRunner",
     args = [test_class],
-    deps = [":protoc-gen-java_gapic"] + MAIN_DEPS + TEST_DEPS,
+    runtime_deps = [
+        ":gapic_generator_java",
+        ":gapic_generator_java-test",
+    ] + MAIN_DEPS + TEST_DEPS,
     data = glob([
         "src/test/java/**/*.golden",
         "src/test/resources/**",

DEVELOPMENT.md

@@ -47,7 +47,7 @@
     java_proto_library(
         name = "showcase_java_proto",
         deps = [
-            "showcase_proto",
+            ":showcase_proto",
         ],
     )
 

repositories.bzl

@@ -77,15 +77,6 @@ def gapic_generator_java_repositories():
         actual = "@com_google_code_gson_gson//jar",
     )
 
-    # grpc-proto doesn't have releases, so we use hashes instead.
-    _io_grpc_proto_prefix = "8e3fec8612bc0708e857950dccadfd5063703e04"  # Nov. 6, 2021.
-    _maybe(
-        http_archive,
-        name = "io_grpc_proto",
-        urls = ["https://github.com/grpc/grpc-proto/archive/%s.zip" % _io_grpc_proto_prefix],
-        strip_prefix = "grpc-proto-%s" % _io_grpc_proto_prefix,
-    )
-
 def _maybe(repo_rule, name, strip_repo_prefix = "", **kwargs):
     if not name.startswith(strip_repo_prefix):
         return