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Author	SHA1	Message	Date
vam	461c053c37	[bazel][python] Support _virtual_imports input for py_proto_library and py_grpc_library rules `proto_library` targets are used as deps for `py_proto_library` and `py_grpc_library` rules. The `proto_library` targets can be configured using `import_prefix` and/or `strip_import_prefix` (which essentially move original location of the proto file and, as result, affects import path within proto files themselves and in the generated language-specific stubs). The biggest question to answer when generating stubs from moved protos is where to put result (this decision affects all downstream rules as well, because the location of file affects its import path). This PR tries to follow same logic as the native `cc_proto_library` (created and maintained by Bazel team). For example, if we have `firestore.proto` file, which is located under `google/firestore/v1beta1` Bazel package and want to move it under `google/cloud/firestore_v1beta1/proto` (this is axactly what happens in googleapis repository), it can be configured the following way: ```bzl proto_library( name = "firestore_moved_proto", srcs = ["firestore.proto"], import_prefix = "google/cloud/firestore_v1beta1/proto", strip_import_prefix = "google/firestore/v1beta1", ) ``` The rule above will first generate virtual `.proto` files (under new location) and only after that generate a binary descriptor from them. Specifically it will generate the following "virtual" file under `_virtual_imports` subdirectory of same package: ``` bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/common.proto ``` When supplied to `cc_proto_library`, like the following: ```bzl cc_proto_library( name = "firestore_moved_cc_proto", deps = ["firestore_moved_proto"], ) ``` The rule will generate .cc and .h files like the following: ``` bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore.pb.h bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore.pb.cc ``` Notice, that each generated `.cc` and `.h` file is prefixed with `_virtual_imports/<name_of_proto_library_target>`. The python rules try to do same thing, so for the following py_proto_library rule: ```bzl py_proto_library( name = "firestore_moved_py_proto", deps = [":firestore_moved_proto"], ) ``` It wil generate the following file: ``` bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore_pb2.py ``` I.e in same path as cc_proto_library. This all woks, but an annoying part is that to use the generated library in some other py_library, in needs to specify the "_virtual_imports/proto_target" path as its "includes" parameter (and I can't make it better than that). Another option would be to skeep the `_virtual_imports/<name_of_proto_library_target>` the suffix for the generated python stubs, which will make the path look like the following: ``` bazel-bin/google/firestore/v1beta1/google/cloud/firestore_v1beta1/proto/firestore_pb2.py ``` That will make using generated stubs simpler and cleaner (no need to specify imports argument), but it will make it inconsistent with the other rules (like cc_proto_library) and also more susseptible to naming conflicts (if there is already something under the generated path).	5 years ago
Tony Lu	44868ae12a	Starting a new branch with same changes from https://github.com/grpc/grpc/pull/19621	5 years ago

Author

SHA1

Message

Date

vam

461c053c37

[bazel][python] Support _virtual_imports input for py_proto_library and py_grpc_library rules

`proto_library` targets are used as deps for `py_proto_library` and `py_grpc_library` rules. The `proto_library` targets can be configured using `import_prefix` and/or `strip_import_prefix` (which essentially move original location of the proto file and, as result, affects import path within proto files themselves and in the generated language-specific stubs).

The biggest question to answer when generating stubs from moved protos is where to put result (this decision affects all downstream rules as well, because the location of file affects its import path).

This PR tries to follow same logic as the native `cc_proto_library` (created and maintained by Bazel team). For example, if we have `firestore.proto` file, which is located under `google/firestore/v1beta1` Bazel package and want to move it under `google/cloud/firestore_v1beta1/proto` (this is axactly what happens in googleapis repository), it can be configured the following way:

```bzl
proto_library(
    name = "firestore_moved_proto",
    srcs = ["firestore.proto"],
    import_prefix = "google/cloud/firestore_v1beta1/proto",
    strip_import_prefix = "google/firestore/v1beta1",
)
```

The rule above will first generate virtual `.proto` files (under new location) and only after that generate a binary descriptor from them.
Specifically it will generate the following "virtual" file under `_virtual_imports` subdirectory of same package:

```
bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/common.proto
```

When supplied to `cc_proto_library`, like the following:

```bzl
cc_proto_library(
    name = "firestore_moved_cc_proto",
    deps = ["firestore_moved_proto"],
)
```

The rule will generate .cc and .h files like the following:
```
bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore.pb.h
bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore.pb.cc
```

Notice, that each generated `.cc` and `.h` file is prefixed with `_virtual_imports/<name_of_proto_library_target>`.

The python rules try to do same thing, so for the following py_proto_library rule:

```bzl
py_proto_library(
    name = "firestore_moved_py_proto",
    deps = [":firestore_moved_proto"],
)
```

It wil generate the following file:
```
bazel-bin/google/firestore/v1beta1/_virtual_imports/firestore_moved_proto/google/cloud/firestore_v1beta1/proto/firestore_pb2.py
```

I.e in same path as cc_proto_library.

This all woks, but an annoying part is that to use the generated library in some other py_library, in needs to specify the "_virtual_imports/proto_target" path as its "includes" parameter (and I can't make it better than that).

Another option would be to skeep the `_virtual_imports/<name_of_proto_library_target>` the suffix for the generated python stubs, which will make the path look like the following:
```
bazel-bin/google/firestore/v1beta1/google/cloud/firestore_v1beta1/proto/firestore_pb2.py
```

That will make using generated stubs simpler and cleaner (no need to specify imports argument), but it will make it inconsistent with the other rules (like cc_proto_library) and also more susseptible to naming conflicts (if there is already something under the generated path).

5 years ago

Tony Lu

44868ae12a

Starting a new branch with same changes from https://github.com/grpc/grpc/pull/19621

5 years ago

2 Commits (43dd7698ea6dc4128fc74fb8aacf8377f3b2a3c5)