Bazel, Protobuf, gRPC, and Python example?

[hai...@grakn.ai]

Hi everyone,

I've been struggling to get a comprehensive guide on how to use Bazel, Protobuf, gRPC, and Python together. There's also no official guide from the Bazel/GRPC docs.

Does anyone know any good examples on how to use all tools together? like a github repo?

Thank you!

[Evan Jones]

I think the "Python" part of this is going to cause you some pain. In particular, I was not really able to get the built-in Python rules to work with third-party PyPI dependencies the last I tried. I ended up writing my own set of Python rules. They "work" and it appears some other brave people are actually using them, but they definitely are not perfect.

The example project includes loading the grpc library and making a gRPC call, but it doesn't include rules to compile the protobufs; if you are interested I'm happy to share my rules for that also (which use the pre-compiled third-party Python tools, rather than compiling protoc from scratch)

https://github.com/TriggerMail/rules_pyz_example

[Naresh R]

Hey!

I had worked on gRPC + Python + Bazel this summer, so I might be able to shed some light on this. Building gRPC Python has been a request for about 2 years now. As of now, you _should be_ able to import gRPC as an external Bazel repository and use the 'grpcio' target for your purposes, but it's bound to be buggy as all tests have not been added/passed yet. There is no ETA, but please do track the above issue for milestones when we get there. As of now, apart from possible "gRPC Python with Bazel" bugs, there's surely a lot of work needed on the "Python with Bazel" end that need to be ironed out for this to work in all environements and setups.

In short, you CAN use the target given above (and please do report any issues you see or oh, come back with contributions!). Refer the official Bazel for Python wiki for quick examples on how to use the main Python rules and the experimental rules_python for pip imports.

Best,

Naresh

[Sabir Ullah]

HI it seems pleasure to see you . currently i am working on Tensorflow detection Api . i want to build .So files using this command: bazel build -c opt //tensorflow/contrib/android:libtensorflow_inference.so --crosstool_top=//external:android/crosstool --host_crosstool_top=@bazel_tools//tools/cpp:toolchain --cpu=armeabi-v7a 

but i am faced bazel build problem like this

ERROR: C:/users/sabir-pc/_bazel_sabir-pc/zp6kp3ov/external/com_google_absl/absl/strings/BUILD.bazel:32:1: C++ compilation of rule '@com_google_absl//absl/strings:strings' failed (Exit 1)

In file included from external/com_google_absl/absl/strings/internal/charconv_parse.cc:15:

In file included from external/com_google_absl\absl/strings/internal/charconv_parse.h:20:

external/com_google_absl\absl/strings/charconv.h:26:6: warning: scoped enumerations are a C++11 extension [-Wc++11-extensions]

enum class chars_format {

     ^

external/com_google_absl\absl/strings/charconv.h:77:55: warning: use of enumeration in a nested name specifier is a C++11 extension [-Wc++11-extensions]

                                   chars_format fmt = chars_format::general);

                                                      ^

external/com_google_absl\absl/strings/charconv.h:81:55: warning: use of enumeration in a nested name specifier is a C++11 extension [-Wc++11-extensions]

                                   chars_format fmt = chars_format::general);

                                                      ^

external/com_google_absl\absl/strings/charconv.h:85:8: error: unknown type name 'constexpr'

inline constexpr chars_format operator&(chars_format lhs, chars_format rhs) {

       ^

external/com_google_absl\absl/strings/charconv.h:85:1: warning: inline variables are a C++17 extension [-Wc++17-extensions]

inline constexpr chars_format operator&(chars_format lhs, chars_format rhs) {

^

external/com_google_absl\absl/strings/charconv.h:85:30: error: expected ';' after top level declarator

inline constexpr chars_format operator&(chars_format lhs, chars_format rhs) {

                             ^

                             ;

In file included from external/com_google_absl/absl/strings/internal/charconv_parse.cc:15:

external/com_google_absl\absl/strings/internal/charconv_parse.h:26:6: warning: scoped enumerations are a C++11 extension [-Wc++11-extensions]

enum class FloatType { kNumber, kInfinity, kNan };

     ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:44:21: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  uint64_t mantissa = 0;

                    ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:50:16: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  int exponent = 0;

               ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:54:24: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  int literal_exponent = 0;

                       ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:57:18: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  FloatType type = FloatType::kNumber;

                 ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:67:30: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  const char* subrange_begin = nullptr;

                             ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:68:28: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  const char* subrange_end = nullptr;

                           ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:72:19: warning: in-class initialization of non-static data member is a C++11 extension [-Wc++11-extensions]

  const char* end = nullptr;

                  ^

external/com_google_absl\absl/strings/internal/charconv_parse.h:57:20: warning: use of enumeration in a nested name specifier is a C++11 extension [-Wc++11-extensions]

  FloatType type = FloatType::kNumber;

                   ^

In file included from external/com_google_absl/absl/strings/internal/charconv_parse.cc:22:

In file included from external/com_google_absl\absl/strings/internal/memutil.h:68:

In file included from external/com_google_absl\absl/base/port.h:23:

In file included from external/com_google_absl\absl/base/config.h:66:

external/com_google_absl\absl/base/policy_checks.h:77:2: error: "C++ versions less than C++11 are not supported."

#error "C++ versions less than C++11 are not supported."

 ^

In file included from external/com_google_absl/absl/strings/internal/charconv_parse.cc:22:

In file included from external/com_google_absl\absl/strings/internal/memutil.h:69:

In file included from external/com_google_absl\absl/strings/ascii.h:59:

In file included from external/com_google_absl\absl/strings/string_view.h:51:

external/com_google_absl\absl/base/internal/throw_delegate.h:39:2: error: expected expression

[[noreturn]] void ThrowStdLogicError(const std::string& what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:39:14: error: expected unqualified-id

[[noreturn]] void ThrowStdLogicError(const std::string& what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:40:2: error: expected expression

[[noreturn]] void ThrowStdLogicError(const char* what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:40:14: error: expected unqualified-id

[[noreturn]] void ThrowStdLogicError(const char* what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:41:2: error: expected expression

[[noreturn]] void ThrowStdInvalidArgument(const std::string& what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:41:14: error: expected unqualified-id

[[noreturn]] void ThrowStdInvalidArgument(const std::string& what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:42:2: error: expected expression

[[noreturn]] void ThrowStdInvalidArgument(const char* what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:42:14: error: expected unqualified-id

[[noreturn]] void ThrowStdInvalidArgument(const char* what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:43:2: error: expected expression

[[noreturn]] void ThrowStdDomainError(const std::string& what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:43:14: error: expected unqualified-id

[[noreturn]] void ThrowStdDomainError(const std::string& what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:44:2: error: expected expression

[[noreturn]] void ThrowStdDomainError(const char* what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:44:14: error: expected unqualified-id

[[noreturn]] void ThrowStdDomainError(const char* what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:45:2: error: expected expression

[[noreturn]] void ThrowStdLengthError(const std::string& what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:45:14: error: expected unqualified-id

[[noreturn]] void ThrowStdLengthError(const std::string& what_arg);

             ^

external/com_google_absl\absl/base/internal/throw_delegate.h:46:2: error: expected expression

[[noreturn]] void ThrowStdLengthError(const char* what_arg);

 ^

external/com_google_absl\absl/base/internal/throw_delegate.h:46:14: error: expected unqualified-id

[[noreturn]] void ThrowStdLengthError(const char* what_arg);

             ^

fatal error: too many errors emitted, stopping now [-ferror-limit=]

13 warnings and 20 errors generated.

Target //tensorflow/contrib/android:libtensorflow_inference.so failed to build

Use --verbose_failures to see the command lines of failed build steps.

INFO: Elapsed time: 261.977s, Critical Path: 19.43s

INFO: 212 processes: 212 local.

FAILED: Build did NOT complete successfully

So if u have a good knowledge pleas guide us

[Sabir Ullah]

[Sabir Ullah]

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