Merge pull request #15176 from apolcyn/convert_resolver_component_test_to_python

Convert c-ares test runner from bash to python, to support windows

8 files changed, 307 insertions, 199 deletions

diff --git a/test/cpp/naming/BUILD b/test/cpp/naming/BUILD
index 54b53d2792..fa0b216f8f 100644
--- a/test/cpp/naming/BUILD
+++ b/test/cpp/naming/BUILD
@@ -22,16 +22,17 @@ package(
 
 licenses(["notice"])  # Apache v2
 
-load("//bazel:grpc_build_system.bzl", "grpc_sh_binary", "grpc_py_binary")
+load("//bazel:grpc_build_system.bzl", "grpc_py_binary")
 
 load(":generate_resolver_component_tests.bzl", "generate_resolver_component_tests")
 
 # Meant to be invoked only through the top-level shell script driver.
-grpc_sh_binary(
+grpc_py_binary(
     name = "resolver_component_tests_runner",
     srcs = [
-        "resolver_component_tests_runner.sh",
+        "resolver_component_tests_runner.py",
     ],
+    testonly = True,
 )
 
 generate_resolver_component_tests()
diff --git a/test/cpp/naming/generate_resolver_component_tests.bzl b/test/cpp/naming/generate_resolver_component_tests.bzl
index ebc167931d..5e9aa63abe 100755
--- a/test/cpp/naming/generate_resolver_component_tests.bzl
+++ b/test/cpp/naming/generate_resolver_component_tests.bzl
@@ -13,7 +13,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-load("//bazel:grpc_build_system.bzl", "grpc_sh_binary", "grpc_cc_test", "grpc_cc_binary")
+load("//bazel:grpc_build_system.bzl", "grpc_cc_test", "grpc_cc_binary")
 
 def generate_resolver_component_tests():
   for unsecure_build_config_suffix in ['_unsecure', '']:
diff --git a/test/cpp/naming/resolver_component_tests_runner.py b/test/cpp/naming/resolver_component_tests_runner.py
new file mode 100755
index 0000000000..69386ebeb0
--- /dev/null
+++ b/test/cpp/naming/resolver_component_tests_runner.py
@@ -0,0 +1,275 @@
+#!/usr/bin/env python
+# Copyright 2015 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# This file is auto-generated
+
+import argparse
+import sys
+import subprocess
+import tempfile
+import os
+import time
+import signal
+
+
+argp = argparse.ArgumentParser(description='Run c-ares resolver tests')
+argp.add_argument('--test_bin_path', default=None, type=str,
+                  help='Path to gtest test binary to invoke.')
+argp.add_argument('--dns_server_bin_path', default=None, type=str,
+                  help='Path to local DNS server python script.')
+argp.add_argument('--records_config_path', default=None, type=str,
+                  help=('Path to DNS records yaml file that '
+                        'specifies records for the DNS sever. '))
+argp.add_argument('--dns_server_port', default=None, type=int,
+                  help=('Port that local DNS server is listening on.'))
+argp.add_argument('--dns_resolver_bin_path', default=None, type=str,
+                  help=('Path to the DNS health check utility.'))
+argp.add_argument('--tcp_connect_bin_path', default=None, type=str,
+                  help=('Path to the TCP health check utility.'))
+args = argp.parse_args()
+
+def test_runner_log(msg):
+  sys.stderr.write('\n%s: %s\n' % (__file__, msg))
+
+cur_resolver = os.environ.get('GRPC_DNS_RESOLVER')
+if cur_resolver and cur_resolver != 'ares':
+  test_runner_log(('WARNING: cur resolver set to %s. This set of tests '
+      'needs to use GRPC_DNS_RESOLVER=ares.'))
+  test_runner_log('Exit 1 without running tests.')
+  sys.exit(1)
+os.environ.update({'GRPC_DNS_RESOLVER': 'ares'})
+
+def wait_until_dns_server_is_up(args,
+                                dns_server_subprocess,
+                                dns_server_subprocess_output):
+  for i in range(0, 30):
+    test_runner_log('Health check: attempt to connect to DNS server over TCP.')
+    tcp_connect_subprocess = subprocess.Popen([
+        args.tcp_connect_bin_path,
+        '--server_host', '127.0.0.1',
+        '--server_port', str(args.dns_server_port),
+        '--timeout', str(1)])
+    tcp_connect_subprocess.communicate()
+    if tcp_connect_subprocess.returncode == 0:
+      test_runner_log(('Health check: attempt to make an A-record '
+                       'query to DNS server.'))
+      dns_resolver_subprocess = subprocess.Popen([
+          args.dns_resolver_bin_path,
+          '--qname', 'health-check-local-dns-server-is-alive.resolver-tests.grpctestingexp',
+          '--server_host', '127.0.0.1',
+          '--server_port', str(args.dns_server_port)],
+          stdout=subprocess.PIPE)
+      dns_resolver_stdout, _ = dns_resolver_subprocess.communicate()
+      if dns_resolver_subprocess.returncode == 0:
+        if '123.123.123.123' in dns_resolver_stdout:
+          test_runner_log(('DNS server is up! '
+                           'Successfully reached it over UDP and TCP.'))
+        return
+    time.sleep(0.1)
+  dns_server_subprocess.kill()
+  dns_server_subprocess.wait()
+  test_runner_log(('Failed to reach DNS server over TCP and/or UDP. '
+                   'Exitting without running tests.'))
+  test_runner_log('======= DNS server stdout '
+                  '(merged stdout and stderr) =============')
+  with open(dns_server_subprocess_output, 'r') as l:
+    test_runner_log(l.read())
+  test_runner_log('======= end DNS server output=========')
+  sys.exit(1)
+
+dns_server_subprocess_output = tempfile.mktemp()
+with open(dns_server_subprocess_output, 'w') as l:
+  dns_server_subprocess = subprocess.Popen([
+      args.dns_server_bin_path,
+      '--port', str(args.dns_server_port),
+      '--records_config_path', args.records_config_path],
+      stdin=subprocess.PIPE,
+      stdout=l,
+      stderr=l)
+
+def _quit_on_signal(signum, _frame):
+  test_runner_log('Received signal: %d' % signum)
+  dns_server_subprocess.kill()
+  dns_server_subprocess.wait()
+  sys.exit(1)
+
+signal.signal(signal.SIGINT, _quit_on_signal)
+signal.signal(signal.SIGTERM, _quit_on_signal)
+wait_until_dns_server_is_up(args,
+                            dns_server_subprocess,
+                            dns_server_subprocess_output)
+num_test_failures = 0
+
+test_runner_log('Run test with target: %s' % 'srv-ipv4-single-target.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv4-single-target.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:1234,True',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv4-multi-target.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv4-multi-target.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.5:1234,True;1.2.3.6:1234,True;1.2.3.7:1234,True',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv6-single-target.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv6-single-target.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '[2607:f8b0:400a:801::1001]:1234,True',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv6-multi-target.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv6-multi-target.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '[2607:f8b0:400a:801::1002]:1234,True;[2607:f8b0:400a:801::1003]:1234,True;[2607:f8b0:400a:801::1004]:1234,True',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv4-simple-service-config.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv4-simple-service-config.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:1234,True',
+  '--expected_chosen_service_config', '{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"SimpleService","waitForReady":true}]}]}',
+  '--expected_lb_policy', 'round_robin',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-no-srv-simple-service-config.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-no-srv-simple-service-config.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"NoSrvSimpleService","waitForReady":true}]}]}',
+  '--expected_lb_policy', 'round_robin',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-no-config-for-cpp.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-no-config-for-cpp.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-cpp-config-has-zero-percentage.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-cpp-config-has-zero-percentage.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-second-language-is-cpp.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-second-language-is-cpp.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"CppService","waitForReady":true}]}]}',
+  '--expected_lb_policy', 'round_robin',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-config-with-percentages.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-config-with-percentages.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"AlwaysPickedService","waitForReady":true}]}]}',
+  '--expected_lb_policy', 'round_robin',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv4-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv4-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:1234,True;1.2.3.4:443,False',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'srv-ipv6-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'srv-ipv6-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '[2607:f8b0:400a:801::1002]:1234,True;[2607:f8b0:400a:801::1002]:443,False',
+  '--expected_chosen_service_config', '',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('Run test with target: %s' % 'ipv4-config-causing-fallback-to-tcp.resolver-tests-version-4.grpctestingexp.')
+current_test_subprocess = subprocess.Popen([
+  args.test_bin_path,
+  '--target_name', 'ipv4-config-causing-fallback-to-tcp.resolver-tests-version-4.grpctestingexp.',
+  '--expected_addrs', '1.2.3.4:443,False',
+  '--expected_chosen_service_config', '{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwo","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooThree","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooFour","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooFive","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooSix","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooSeven","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooEight","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooNine","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTen","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooEleven","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]}]}',
+  '--expected_lb_policy', '',
+  '--local_dns_server_address', '127.0.0.1:%d' % args.dns_server_port])
+current_test_subprocess.communicate()
+if current_test_subprocess.returncode != 0:
+  num_test_failures += 1
+
+test_runner_log('now kill DNS server')
+dns_server_subprocess.kill()
+dns_server_subprocess.wait()
+test_runner_log('%d tests failed.' % num_test_failures)
+sys.exit(num_test_failures)
diff --git a/test/cpp/naming/resolver_component_tests_runner.sh b/test/cpp/naming/resolver_component_tests_runner.sh
deleted file mode 100755
index 3f8765fa94..0000000000
--- a/test/cpp/naming/resolver_component_tests_runner.sh
+++ /dev/null
@@ -1,187 +0,0 @@
-#!/bin/bash
-# Copyright 2015 gRPC authors.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-# This file is auto-generated
-
-set -ex
-
-# all command args required in this set order
-FLAGS_test_bin_path=$(echo "$1" | grep '\--test_bin_path=' | sed 's/^--test_bin_path=//')
-FLAGS_dns_server_bin_path=$(echo "$2" | grep '\--dns_server_bin_path=' | sed 's/^--dns_server_bin_path=//')
-FLAGS_records_config_path=$(echo "$3" | grep '\--records_config_path=' | sed 's/^--records_config_path=//')
-FLAGS_dns_server_port=$(echo "$4" | grep '\--dns_server_port=' | sed 's/^--dns_server_port=//')
-FLAGS_dns_resolver_bin_path=$(echo "$5" | grep '\--dns_resolver_bin_path=' | sed 's/^--dns_resolver_bin_path=//')
-FLAGS_tcp_connect_bin_path=$(echo "$6" | grep '\--tcp_connect_bin_path=' | sed 's/^--tcp_connect_bin_path=//')
-
-for cmd_arg in "$FLAGS_test_bin_path" "$FLAGS_dns_server_bin_path" "$FLAGS_records_config_path" "$FLAGS_dns_server_port" "$FLAGS_dns_resolver_bin_path" "$FLAGS_tcp_connect_bin_path"; do
-  if [[ "$cmd_arg" == "" ]]; then
-    echo "Missing a CMD arg" && exit 1
-  fi
-done
-
-if [[ "$GRPC_DNS_RESOLVER" != "" && "$GRPC_DNS_RESOLVER" != ares ]]; then
-  echo "This test only works under GRPC_DNS_RESOLVER=ares. Have GRPC_DNS_RESOLVER=$GRPC_DNS_RESOLVER" && exit 1
-fi
-export GRPC_DNS_RESOLVER=ares
-
-DNS_SERVER_LOG="$(mktemp)"
-"$FLAGS_dns_server_bin_path" --records_config_path="$FLAGS_records_config_path" --port="$FLAGS_dns_server_port" > "$DNS_SERVER_LOG" 2>&1 &
-DNS_SERVER_PID=$!
-echo "Local DNS server started. PID: $DNS_SERVER_PID"
-
-# Health check local DNS server TCP and UDP ports
-for ((i=0;i<30;i++));
-do
-  echo "Retry health-check local DNS server by attempting a DNS query and TCP handshake"
-  RETRY=0
-  $FLAGS_dns_resolver_bin_path -s 127.0.0.1 -p "$FLAGS_dns_server_port" -n health-check-local-dns-server-is-alive.resolver-tests.grpctestingexp. -t 1 | grep '123.123.123.123' || RETRY=1
-  $FLAGS_tcp_connect_bin_path -s 127.0.0.1 -p "$FLAGS_dns_server_port" -t 1 || RETRY=1
-  if [[ "$RETRY" == 0 ]]; then
-    break
-  fi;
-  sleep 0.1
-done
-
-if [[ $RETRY == 1 ]]; then
-  echo "FAILED TO START LOCAL DNS SERVER"
-  kill -SIGTERM "$DNS_SERVER_PID" || true
-  wait
-  echo "========== DNS server log (merged stdout and stderr) ========="
-  cat "$DNS_SERVER_LOG"
-  echo "========== end DNS server log ================================"
-  exit 1
-fi
-
-function terminate_all {
-  echo "Received signal. Terminating $! and $DNS_SERVER_PID"
-  kill -SIGTERM "$!" || true
-  kill -SIGTERM "$DNS_SERVER_PID" || true
-  wait
-  exit 1
-}
-
-trap terminate_all SIGTERM SIGINT
-
-EXIT_CODE=0
-# TODO: this test should check for GCE residency and skip tests using _grpclb._tcp.* SRV records once GCE residency checks are made
-# in the resolver.
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv4-single-target.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:1234,True' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv4-multi-target.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.5:1234,True;1.2.3.6:1234,True;1.2.3.7:1234,True' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv6-single-target.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='[2607:f8b0:400a:801::1001]:1234,True' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv6-multi-target.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='[2607:f8b0:400a:801::1002]:1234,True;[2607:f8b0:400a:801::1003]:1234,True;[2607:f8b0:400a:801::1004]:1234,True' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv4-simple-service-config.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:1234,True' \
-  --expected_chosen_service_config='{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"SimpleService","waitForReady":true}]}]}' \
-  --expected_lb_policy='round_robin' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-no-srv-simple-service-config.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"NoSrvSimpleService","waitForReady":true}]}]}' \
-  --expected_lb_policy='round_robin' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-no-config-for-cpp.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-cpp-config-has-zero-percentage.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-second-language-is-cpp.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"CppService","waitForReady":true}]}]}' \
-  --expected_lb_policy='round_robin' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-config-with-percentages.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"AlwaysPickedService","waitForReady":true}]}]}' \
-  --expected_lb_policy='round_robin' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv4-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:1234,True;1.2.3.4:443,False' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='srv-ipv6-target-has-backend-and-balancer.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='[2607:f8b0:400a:801::1002]:1234,True;[2607:f8b0:400a:801::1002]:443,False' \
-  --expected_chosen_service_config='' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-$FLAGS_test_bin_path \
-  --target_name='ipv4-config-causing-fallback-to-tcp.resolver-tests-version-4.grpctestingexp.' \
-  --expected_addrs='1.2.3.4:443,False' \
-  --expected_chosen_service_config='{"loadBalancingPolicy":"round_robin","methodConfig":[{"name":[{"method":"Foo","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwo","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooThree","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooFour","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooFive","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooSix","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooSeven","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooEight","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooNine","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTen","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooEleven","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]},{"name":[{"method":"FooTwelve","service":"SimpleService","waitForReady":true}]}]}' \
-  --expected_lb_policy='' \
-  --local_dns_server_address="127.0.0.1:$FLAGS_dns_server_port" &
-wait "$!" || EXIT_CODE=1
-
-kill -SIGTERM "$DNS_SERVER_PID" || true
-wait
-exit $EXIT_CODE
diff --git a/test/cpp/naming/resolver_component_tests_runner_invoker.cc b/test/cpp/naming/resolver_component_tests_runner_invoker.cc
index 6d0708e2f2..45c1029caa 100644
--- a/test/cpp/naming/resolver_component_tests_runner_invoker.cc
+++ b/test/cpp/naming/resolver_component_tests_runner_invoker.cc
@@ -184,7 +184,7 @@ int main(int argc, char** argv) {
     std::string const bin_dir = my_bin.substr(0, my_bin.rfind('/'));
     // Invoke the .sh and .py scripts directly where they are in source code.
     grpc::testing::InvokeResolverComponentTestsRunner(
-        "test/cpp/naming/resolver_component_tests_runner.sh",
+        "test/cpp/naming/resolver_component_tests_runner.py",
         bin_dir + "/" + FLAGS_test_bin_name,
         "test/cpp/naming/utils/dns_server.py",
         "test/cpp/naming/resolver_test_record_groups.yaml",
diff --git a/test/cpp/naming/utils/dns_resolver.py b/test/cpp/naming/utils/dns_resolver.py
index 6b272444e7..74f4ca2351 100755
--- a/test/cpp/naming/utils/dns_resolver.py
+++ b/test/cpp/naming/utils/dns_resolver.py
@@ -16,9 +16,12 @@
 """Makes DNS queries for A records to specified servers"""
 
 import argparse
-import signal
+import threading
+import time
 import twisted.internet.task as task
 import twisted.names.client as client
+import twisted.internet.reactor as reactor
+
 
 def main():
   argp = argparse.ArgumentParser(description='Make DNS queries for A records')
@@ -31,7 +34,6 @@ def main():
   argp.add_argument('-t', '--timeout', default=1, type=int,
                     help=('Force process exit after this number of seconds.'))
   args = argp.parse_args()
-  signal.alarm(args.timeout)
   def OnResolverResultAvailable(result):
     answers, authority, additional = result
     for a in answers:
diff --git a/test/cpp/naming/utils/dns_server.py b/test/cpp/naming/utils/dns_server.py
index 9f42f65ee6..1e8e2e3287 100755
--- a/test/cpp/naming/utils/dns_server.py
+++ b/test/cpp/naming/utils/dns_server.py
@@ -20,6 +20,8 @@ import sys
 import yaml
 import signal
 import os
+import threading
+import time
 
 import twisted
 import twisted.internet
@@ -33,6 +35,7 @@ import twisted.names.dns
 import twisted.names.server
 from twisted.names import client, server, common, authority, dns
 import argparse
+import platform
 
 _SERVER_HEALTH_CHECK_RECORD_NAME = 'health-check-local-dns-server-is-alive.resolver-tests.grpctestingexp' # missing end '.' for twisted syntax
 _SERVER_HEALTH_CHECK_RECORD_DATA = '123.123.123.123'
@@ -115,6 +118,18 @@ def _quit_on_signal(signum, _frame):
   sys.stdout.flush()
   sys.exit(0)
 
+def flush_stdout_loop():
+  num_timeouts_so_far = 0
+  sleep_time = 1
+  # Prevent zombies. Tests that use this server are short-lived.
+  max_timeouts = 60 * 2
+  while num_timeouts_so_far < max_timeouts:
+    sys.stdout.flush()
+    time.sleep(sleep_time)
+    num_timeouts_so_far += 1
+  print('Process timeout reached, or cancelled. Exitting 0.')
+  os.kill(os.getpid(), signal.SIGTERM)
+
 def main():
   argp = argparse.ArgumentParser(description='Local DNS Server for resolver tests')
   argp.add_argument('-p', '--port', default=None, type=int,
@@ -123,11 +138,11 @@ def main():
                     help=('Directory of resolver_test_record_groups.yaml file. '
                           'Defauls to path needed when the test is invoked as part of run_tests.py.'))
   args = argp.parse_args()
-  signal.signal(signal.SIGALRM, _quit_on_signal)
   signal.signal(signal.SIGTERM, _quit_on_signal)
   signal.signal(signal.SIGINT, _quit_on_signal)
-  # Prevent zombies. Tests that use this server are short-lived.
-  signal.alarm(2 * 60)
+  output_flush_thread = threading.Thread(target=flush_stdout_loop)
+  output_flush_thread.setDaemon(True)
+  output_flush_thread.start()
   start_local_dns_server(args)
 
 if __name__ == '__main__':
diff --git a/test/cpp/naming/utils/tcp_connect.py b/test/cpp/naming/utils/tcp_connect.py
index bf7455e3c2..5773c7cae8 100755
--- a/test/cpp/naming/utils/tcp_connect.py
+++ b/test/cpp/naming/utils/tcp_connect.py
@@ -16,8 +16,11 @@
 """Opens a TCP connection to a specified server and then exits."""
 
 import argparse
-import signal
 import socket
+import threading
+import time
+import sys
+
 
 def main():
   argp = argparse.ArgumentParser(description='Open a TCP handshake to a server')
@@ -28,7 +31,6 @@ def main():
   argp.add_argument('-t', '--timeout', default=1, type=int,
                     help='Force process exit after this number of seconds.')
   args = argp.parse_args()
-  signal.alarm(args.timeout)
   socket.create_connection([args.server_host, args.server_port])
 
 if __name__ == '__main__':