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https://issues.apache.org/jira/browse/THRIFT-5024?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17934041#comment-17934041
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Asjad commented on THRIFT-5024:
-------------------------------
The [Tornado 5.1 docs|https://www.tornadoweb.org/en/branch5.1/gen.html] say
that {{@gen.engine}} has been
??Deprecated since version 5.1: This decorator will be removed in 6.0. Use
{{[{{coroutine}}|https://www.tornadoweb.org/en/branch5.1/gen.html#tornado.gen.coroutine]}}
or {{{{{}async def{}}}}} instead.??
and accordingly, {{@gen.engine}} is missing in the [Tornado 6.0+
docs|https://www.tornadoweb.org/en/branch6.0/gen.html#tornado.gen.coroutine].
So we have two options (as described by the deprecation notice):
# Replace {{@gen.engine def}} with {{{}@gen.coroutine def{}}}. The fix is as
simple as replacing it on [this
line|https://github.com/apache/thrift/blob/3494e1cd087f1d89848275445d92274a8734dbbf/compiler/cpp/src/thrift/generate/t_py_generator.cc#L1463],
the only usage.
# Replace {{@gen.engine def}} with {{{}async def{}}}. This seems more
complicated in terms of adding {{{}async{}}}/{{{}await{}}} everywhere.
I prefer #1 as the fix because it's more straightforward, and I've fixed and
tested the tutorial this way. I can make a PR.
{code:java}
diff --git a/compiler/cpp/src/thrift/generate/t_py_generator.cc
b/compiler/cpp/src/thrift/generate/t_py_generator.cc
index 893d6355c..c34bb43bc 100644
--- a/compiler/cpp/src/thrift/generate/t_py_generator.cc
+++ b/compiler/cpp/src/thrift/generate/t_py_generator.cc
@@ -1460,7 +1460,7 @@ void t_py_generator::generate_service_client(t_service*
tservice) {
if (gen_tornado_ && extends.empty()) {
f_service_ << '\n' <<
- indent() << "@gen.engine" << '\n' <<
+ indent() << "@gen.coroutine" << '\n' <<
indent() << "def _start_receiving(self):" << '\n';
indent_up();
indent(f_service_) << "while True:" << '\n';{code}
(Note that even with this fix the tutorial still fails with error
{{{}AttributeError: 'TTornadoServer' object has no attribute 'io_loop'{}}}. For
testing we can work around this by adding {{server.io_loop = None}} after
declaring server (in PythonServer.py), but I'm planning on opening a ticket to
properly fix this.)
> tutorial\py.tornado\PythonServer.py failed under Tornado6
> ---------------------------------------------------------
>
> Key: THRIFT-5024
> URL: https://issues.apache.org/jira/browse/THRIFT-5024
> Project: Thrift
> Issue Type: Bug
> Components: Python - Compiler
> Affects Versions: 0.13.0
> Reporter: Honglei Jiang
> Priority: Major
>
> File "E:\PythonLibs\dmaproxy\tests\ThriftAPI\py.tornado\PythonServer.py",
> line 28, in <module>
> from tutorial import Calculator
> File
> "E:\PythonLibs\dmaproxy\tests\ThriftAPI\py.tornado\tutorial\Calculator.py",
> line 14, in <module>
> import shared.SharedService
> File
> "E:\PythonLibs\dmaproxy\tests\ThriftAPI\py.tornado\shared\SharedService.py",
> line 33, in <module>
> class Client(Iface):
> File
> "E:\PythonLibs\dmaproxy\tests\ThriftAPI\py.tornado\shared\SharedService.py",
> line 43, in Client
> @gen.engine
> builtins.AttributeError: module 'tornado.gen' has no attribute 'engine'
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