[main] add a test that used to fail for grpcio (with old abseil) (#315)

automerged PR by conda-forge/automerge-action

.ci_support/migrations/libabseil20230802_libgrpc157_libprotobuf4234.yaml

@@ -0,0 +1,13 @@
+__migrator:
+  build_number: 1
+  kind: version
+  migration_number: 1
+libabseil:
+- 20230802
+libgrpc:
+- "1.57"
+libprotobuf:
+- 4.23.4
+MACOSX_DEPLOYMENT_TARGET:  # [osx and x86_64]
+- "10.13"                  # [osx and x86_64]
+migrator_ts: 1692632590.658328

.ci_support/osx_64_.yaml

@@ -1,7 +1,5 @@
 MACOSX_DEPLOYMENT_TARGET:
 - '10.13'
-MACOSX_SDK_VERSION:
-- '10.13'
 c_ares:
 - '1'
 c_compiler:

recipe/meta.yaml

@@ -50,6 +50,10 @@ outputs:
     build:
       run_exports:
         - {{ pin_subpackage('libgrpc', max_pin='x.x') }}
+        # grpc requires C11 aligned_alloc as of 1.56;
+        # ensure that all dependent packages reflect that to
+        # avoid the solver getting stuck in no-man's-land.
+        - __osx >={{ MACOSX_DEPLOYMENT_TARGET }}  # [osx and x86_64]
     requirements:
       build:
         - {{ compiler('c') }}
@@ -87,7 +91,7 @@ outputs:
         - ninja
         - pkg-config
         # only required for pkg-config test (which wants to find zlib.pc)
-        - zlib  # [win]
+        - zlib
       files:
         - cmake_test/
         - hello.proto
@@ -155,10 +159,14 @@ outputs:
         - {{ pin_subpackage('libgrpc', exact=True) }}
         - __osx >={{ MACOSX_DEPLOYMENT_TARGET|default("10.9") }}  # [osx and x86_64]
     test:
+      source_files:
+        - examples/
       files:
         - grpcio_distribtest.py
+        - test_grpcio_helloworld.py
       requires:
         - pip
+        - protobuf
       imports:
         - grpc
         - grpc._cython
@@ -173,6 +181,12 @@ outputs:
       commands:
         - python -m pip check
         - python grpcio_distribtest.py
+        # test actual RPC pattern (client & server); other tests did not catch
+        # https://github.com/conda-forge/grpc-cpp-feedstock/issues/281
+        - cd examples/python/helloworld
+        # copy test defined in feedstock to where it needs to run
+        - cp ../../../test_grpcio_helloworld.py .
+        - python test_grpcio_helloworld.py
 
 about:
   home: https://grpc.io/

recipe/test_grpcio_helloworld.py

@@ -0,0 +1,31 @@
+import os
+import signal
+import subprocess
+import sys
+import time
+
+# this test assumes it is being run in examples/python/helloworld,
+# after having generated the helloworld_pb2{,_grpc} modules (see meta.yaml)
+import grpc
+import helloworld_pb2
+import helloworld_pb2_grpc
+
+
+# start server (and wait a little)
+print('Starting server...')
+pid = subprocess.Popen([sys.executable, "greeter_server.py"]).pid
+time.sleep(5)
+
+# run this a couple times because it happens randomly, see
+# https://github.com/conda-forge/grpc-cpp-feedstock/issues/281
+print('Running client...')
+for _ in range(1000):
+    with grpc.insecure_channel('localhost:50051') as channel:
+        stub = helloworld_pb2_grpc.GreeterStub(channel)
+        response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
+
+# tear down server
+print('Terminating server...')
+os.kill(pid, signal.SIGTERM)
+
+print('Success!')