build: fix synth.py to generate only proto/grpc targets without gapic…

… assembly tarball (#34)

synth.py

@@ -14,51 +14,78 @@
 
 """This script is used to synthesize generated parts of this library."""
 
+import os
+from pathlib import Path
+import tempfile
+from typing import Union
+
 import synthtool as s
-import synthtool.gcp as gcp
-import synthtool.languages.java as java
+from synthtool.languages import java
+from synthtool.sources import git
+from synthtool import logger, shell
 
-service = 'iam'
 versions = ['v1']
 
-gapic = gcp.GAPICBazel()
+GOOGLEAPIS_URL = git.make_repo_clone_url("googleapis/googleapis")
 
-for version in versions:
-  library = gapic.java_library(
-    service=service,
-    version=version,
-    proto_path=f'google/iam/{version}',
-    bazel_target=f'//google/iam/{version}:google-iam-{version}-java',
-  )
-  library = library / f"google-iam-{version}-java"
-  java.fix_proto_headers(library / f"proto-google-iam-{version}-java")
-  s.copy(
-    [library / f"proto-google-iam-{version}-java/src"],
-    f"proto-google-iam-{version}/src",
-    required=True,
-  )
-  java.fix_grpc_headers(library / f"grpc-google-iam-{version}-java", package_name=None)
-  s.copy(
-    [library / f"grpc-google-iam-{version}-java/src"],
-    f"grpc-google-iam-{version}/src",
-    required=True,
-  )
+logger.debug("Cloning googleapis.")
+googleapis = git.clone(GOOGLEAPIS_URL)
+
+def bazel_build(target: str, cwd: Union[Path, str]) -> Path:
+  """Build a bazel target and return the output build directory."""
+  old_cwd = os.getcwd()
+  os.chdir(str(cwd))
+
+  bazel_run_args = [
+    "bazel",
+    "--max_idle_secs=240",
+    "build",
+    target,
+  ]
+
+  logger.debug(f"Generating code for: {target}.")
+  shell.run(bazel_run_args)
+
+  output_dir = Path(f"bazel-bin{os.path.sep}{target[2:].split(':')[0]}").resolve()
+  os.chdir(old_cwd)
 
-  # logging protos
-  logging = gapic.java_library(
-    service=service,
-    version=version,
-    proto_path=f'google/iam/{version}/logging',
-    bazel_target=f'//google/iam/{version}/logging:google-iam-{version}-logging-java',
+  return output_dir
+
+def build_proto(target):
+  """Build a proto build target and copy all generate source files."""
+  output = bazel_build(
+    target=target,
+    cwd=googleapis,
   )
-  logging = logging / f"google-iam-{version}-logging-java"
-  java.fix_proto_headers(logging / f"proto-google-iam-{version}-logging-java")
-  s.copy(
-    [logging / f"proto-google-iam-{version}-logging-java/src"],
-    f"proto-google-iam-{version}/src",
-    required=True,
+
+  src_output = Path(tempfile.mkdtemp())
+  for proto_jar in output.glob("*-speed-src.jar"):
+    logger.debug(f"unzipping: {os.path.basename(proto_jar)}")
+    shell.run(["unzip", "-o", proto_jar, "-d", src_output / "src"])
+
+  java.fix_proto_headers(src_output)
+  s.copy(src_output / "src/com", "proto-google-iam-v1/src/main/java/com")
+
+def build_grpc(target):
+  """Build a grpc build target and copy all generate source files."""
+  output = bazel_build(
+    target=target,
+    cwd=googleapis,
   )
 
+  src_output = Path(tempfile.mkdtemp())
+  for proto_jar in output.glob("*grpc-src.jar"):
+    logger.debug(f"unzipping: {os.path.basename(proto_jar)}")
+    shell.run(["unzip", "-o", proto_jar, "-d", src_output / "src"])
+
+  java.fix_grpc_headers(src_output, "")
+  s.copy(src_output / "src/com", "grpc-google-iam-v1/src/main/java/com")
+
+for version in versions:
+  build_proto(f"//google/iam/{version}:iam_java_proto")
+  build_proto(f"//google/iam/{version}/logging:logging_java_proto")
+  build_grpc(f"//google/iam/{version}:iam_java_grpc")
+
   java.format_code(f"proto-google-iam-{version}/src")
   java.format_code(f"grpc-google-iam-{version}/src")