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在Mac OS上生成Protobuf Dart代码时找不到protoc-gen-dart插件

dartprotocol-buffersprotoc
14
我已使用Homebrew安装了protoc，并尝试使用proto文件生成Dart代码。 当我尝试像这样的简单情况：protoc --dart_out=. test.proto 它给了我以下错误信息： protoc-gen-dart: 程序未找到或不可执行 --dart_out：protoc-gen-dart：插件状态代码1失败。 但是protoc-gen-dart在我的路径中...
我还尝试指定路径，例如protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto，但仍然出现相同的错误...
有人知道如何解决这个问题吗？
编辑：
echo | ~/.pub-cache/bin/protoc-gen-dart
Unhandled exception:
InvalidProtocolBufferException: CodedBufferReader encountered a malformed varint.
#0      CodedBufferReader._readRawVarint32 (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:180:5)
#1      CodedBufferReader.readInt32 (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:109:22)
#2      CodedBufferReader.readBytes (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:126:18)
#3      CodedBufferReader.readString (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer_reader.dart:132:39)
#4      _mergeFromCodedBufferReader (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/coded_buffer.dart:158:47)
#5      GeneratedMessage.mergeFromBuffer (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/generated_message.dart:159:5)
#6      new GeneratedMessage.fromBuffer (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protobuf-0.10.5/lib/src/protobuf/generated_message.dart:31:5)
#7      new CodeGeneratorRequest.fromBuffer (package:protoc_plugin/src/plugin.pb.dart:88:15)
#8      CodeGenerator.generate.<anonymous closure> (file:///Users/jaumard/.pub-cache/hosted/pub.dartlang.org/protoc_plugin-0.10.5/lib/code_generator.dart:66:25)
#9      _RootZone.runUnary (dart:async/zone.dart:1379:54)
#10     _FutureListener.handleValue (dart:async/future_impl.dart:129:18)
#11     Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:642:45)
#12     Future._propagateToListeners (dart:async/future_impl.dart:671:32)
#13     Future._complete (dart:async/future_impl.dart:476:7)
#14     Stream.fold.<anonymous closure> (dart:async/stream.dart:726:18)
#15     _RootZone.runGuarded (dart:async/zone.dart:1302:10)
#16     _BufferingStreamSubscription._sendDone.sendDone (dart:async/stream_impl.dart:389:13)
#17     _BufferingStreamSubscription._sendDone (dart:async/stream_impl.dart:399:15)
#18     _BufferingStreamSubscription._close (dart:async/stream_impl.dart:283:7)
#19     _SyncStreamController._sendDone (dart:async/stream_controller.dart:771:19)
#20     _StreamController._closeUnchecked (dart:async/stream_controller.dart:628:7)
#21     _StreamController.close (dart:async/stream_controller.dart:621:5)
#22     _Socket._onData (dart:io/runtime/binsocket_patch.dart:1728:21)
#23     _RootZone.runUnaryGuarded (dart:async/zone.dart:1314:10)
#24     _BufferingStreamSubscription._sendData (dart:async/stream_impl.dart:336:11)
#25     _BufferingStreamSubscription._add (dart:async/stream_impl.dart:263:7)
#26     _SyncStreamController._sendData (dart:async/stream_controller.dart:763:19)
#27     _StreamController._add (dart:async/stream_controller.dart:639:7)
#28     _StreamController.add (dart:async/stream_controller.dart:585:5)
#29     new _RawSocket.<anonymous closure> (dart:io/runtime/binsocket_patch.dart:1290:35)
#30     _NativeSocket.issueReadEvent.issue (dart:io/runtime/binsocket_patch.dart:819:18)
#31     _microtaskLoop (dart:async/schedule_microtask.dart:41:21)
#32     _startMicrotaskLoop (dart:async/schedule_microtask.dart:50:5)
#33     _runPendingImmediateCallback (dart:isolate/runtime/libisolate_patch.dart:115:13)
#34     _RawReceivePortImpl._handleMessage (dart:isolate/runtime/libisolate_patch.dart:172:5)

并且 dtruss 输出：

 sudo dtruss protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto -I=.
Password:
dtrace: system integrity protection is on, some features will not be available

SYSCALL(args)            = return
~/.pub-cache/bin/protoc-gen-dart: program not found or is not executable
--dart_out: protoc-gen-dart: Plugin failed with status code 1.
open("/dev/dtracehelper\0", 0x2, 0xFFFFFFFFE5D36050)             = 3 0
ioctl(0x3, 0x80086804, 0x7FFEE5D35E60)           = 0 0
close(0x3)               = 0 0
madvise(0x10A24F000, 0x2000, 0x5)                = 0 0
access("/AppleInternal/XBS/.isChrooted\0", 0x0, 0x0)             = -1 Err#2
bsdthread_register(0x7FFF65DE2438, 0x7FFF65DE2428, 0x2000)               = 1073742047 0
sysctlbyname(kern.bootargs, 0xD, 0x7FFEE5D35170, 0x7FFEE5D35168, 0x0)            = 0 0
ioctl(0x2, 0x4004667A, 0x7FFEE5D353F4)           = 0 0
mprotect(0x10A2E4000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2EB000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2EC000, 0x1000, 0x0)               = 0 0
mprotect(0x10A2F3000, 0x1000, 0x0)               = 0 0
mprotect(0x109ED0000, 0x90, 0x1)                 = 0 0
mprotect(0x109ED2000, 0x1000, 0x1)               = 0 0
mprotect(0x109ED0000, 0x90, 0x3)                 = 0 0
mprotect(0x109ED0000, 0x90, 0x1)                 = 0 0
issetugid(0x0, 0x0, 0x0)                 = 0 0
getentropy(0x7FFEE5D34A40, 0x20, 0x0)            = 0 0
getpid(0x0, 0x0, 0x0)            = 29452 0
stat64("/AppleInternal\0", 0x7FFEE5D355E0, 0x0)          = -1 Err#2
csops(0x730C, 0x7, 0x7FFEE5D35110)               = -1 Err#22
proc_info(0x2, 0x730C, 0xD)              = 64 0
csops(0x730C, 0x7, 0x7FFEE5D34960)               = -1 Err#22
access(".\0", 0x0, 0x0)          = 0 0
stat64("/\0", 0x7FFEE5D33EF8, 0x0)               = 0 0
getattrlist("/usr\0", 0x7FFF65CC0954, 0x7FFEE5D35840)            = 0 0
getattrlist("/usr/local\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/bin\0", 0x7FFF65CC0954, 0x7FFEE5D35840)          = 0 0
getattrlist("/usr/local/bin/protoc\0", 0x7FFF65CC0954, 0x7FFEE5D35840)           = 0 0
readlink("/usr/local/bin/protoc\0", 0x7FFEE5D34C40, 0x400)               = 37 0
getattrlist("/usr/local/Cellar\0", 0x7FFF65CC0954, 0x7FFEE5D35840)               = 0 0
getattrlist("/usr/local/Cellar/protobuf\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1\0", 0x7FFF65CC0954, 0x7FFEE5D35840)              = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1/bin\0", 0x7FFF65CC0954, 0x7FFEE5D35840)          = 0 0
getattrlist("/usr/local/Cellar/protobuf/3.6.1.1/bin/protoc\0", 0x7FFF65CC0954, 0x7FFEE5D35840)           = 0 0
access("/usr/local/Cellar/protobuf/3.6.1.1/bin/google/protobuf/descriptor.proto\0", 0x0, 0x0)            = -1 Err#2
access("/usr/local/Cellar/protobuf/3.6.1.1/bin/include/google/protobuf/descriptor.proto\0", 0x0, 0x0)            = -1 Err#2
access("/usr/local/Cellar/protobuf/3.6.1.1/include/google/protobuf/descriptor.proto\0", 0x0, 0x0)                = 0 0
access("./test.proto\0", 0x0, 0x0)               = 0 0
open("./test.proto\0", 0x0, 0x2)                 = 3 0
close(0x3)               = 0 0
open("test.proto\0", 0x0, 0x2)           = 3 0
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
close(0x3)               = 0 0
pipe(0x0, 0x0, 0x0)              = 3 0
pipe(0x0, 0x0, 0x0)              = 5 0
fork()           = 29455 0
close(0x3)               = 0 0
close(0x6)               = 0 0
sigaction(0xD, 0x7FFEE5D34C78, 0x7FFEE5D34CA0)           = 0 0
select(0x6, 0x7FFEE5D35FE0, 0x7FFEE5D35F60, 0x0, 0x0)            = 1 0
dtrace: error on enabled probe ID 2172 (ID 161: syscall::write:return): invalid kernel access in action #12 at DIF offset 68
close(0x4)               = 0 0
select(0x6, 0x7FFEE5D35FE0, 0x7FFEE5D35F60, 0x0, 0x0)            = 1 0
dtrace: error on enabled probe ID 2174 (ID 159: syscall::read:return): invalid kernel access in action #12 at DIF offset 68
close(0x5)               = 0 0
wait4(0x730F, 0x7FFEE5D34DD8, 0x0)               = 29455 0
sigaction(0xD, 0x7FFEE5D34C78, 0x7FFEE5D34CA0)           = 0 0
getrlimit(0x1008, 0x7FFEE5D36160, 0x0)           = 0 0
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
dtrace: error on enabled probe ID 2173 (ID 947: syscall::write_nocancel:return): invalid kernel access in action #12 at DIF offset 68
也许 protoc 期望插件位于特定位置，而不仅仅在 PATH 中。或者您可能没有导出新路径。 - Kuba hasn't forgotten Monica
从protoc-gen-dart的文档中可以得知，它只需要在PATH路径下，然后我就可以直接执行protoc-gen-dart命令了，所以我认为这方面没有问题:( - jaumard
2个回答
12

好的，看起来protoc直接将路径参数传递给execve()，它不会将~字符扩展为主目录。请尝试使用以下方法：

Ok，看起来protoc直接将路径参数传递给execve()，它不会将~字符扩展为主目录。请改用以下方法：

protoc --dart_out=. --plugin=protoc-gen-dart=$HOME/.pub-cache/bin/protoc-gen-dart ./test.proto
在这种情况下，$HOME会在执行protoc之前被shell扩展，所以它将看到/Users/yourname/.pub-cache/...的完整路径。

以下是调试中使用的一些步骤，它们可能会对未来的其他人有所帮助：

你的第二个命令看起来应该可以工作：

protoc --dart_out=. --plugin=protoc-gen-dart=~/.pub-cache/bin/protoc-gen-dart ./test.proto

或许可执行文件有问题。您可以尝试直接执行它：

echo | ~/.pub-cache/bin/protoc-gen-dart

如果可以正常运行，那么您应该会收到类似于“google.protobuf.message.DecodeError: Truncated message.”的错误消息，因为来自echo的数据不是插件所期望的。如果您收到其他错误，可能会提示为什么无法执行。

您还可以尝试使用dtruss跟踪protoc，找出插件执行失败的原因：

sudo dtruss -f protoc ...

需要使用-f标志来显示protoc尝试启动插件的信息。 应该在底部有一行类似于这样的内容：

-f 标志是必需的，以显示 protoc 尝试启动插件的情况。 应该在底部有一行类似以下内容的语句：

execve("~/.pub-cache/bin/protoc-gen-dart", ..) = -1 Err#2

Err#后面的错误编号说明执行失败的原因。在我的情况下，它是数字2，在errno.h 文件中可以查找：

grep 2 /usr/include/sys/errno.h

...
#define ENOENT 2 /* No such file or directory */
...

这是因为我没有安装 Dart 插件，但在你的情况下，错误可能会更令人惊讶。

嘿@jpa，感谢您联系我，我已经更新了问题，并提供了两个输出，但不是很理解dtruss的输出^^ - jaumard
@jaumard 嗯，看起来 dtruss 需要 -f 标志才能提供有用的输出。我更新了我的答案。 - jpa
1
@ChristineMeyer 是的，看起来由于某种原因它没有在你的路径中。尝试直接使用完整路径执行它，然后检查例如 echo $PATH 以查看该目录是否存在并正确书写。 - jpa
1
@jpa 现在我尝试使用完整路径到 protoc-gen-dart 的命令，但是出现了这个错误：https://prnt.sc/uewkd5我甚至不知道那个命令是否应该工作。 - Christine Meyer
1
@jpa 测试了 echo $PATH 并且现在看到了这个：https://prnt.sc/uewmur - Christine Meyer
显示剩余11条评论
1
可能是Dart代码生成的protoc_plugin未安装... 如果是这样，请运行
dart pub global activate protoc_plugin
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