[fuzz] Add ChannelArgs fuzzing to the client channel resolver fuzzer (#33200)

test/core/ext/filters/event_engine_client_channel_resolver/BUILD

@@ -26,6 +26,7 @@ grpc_proto_fuzzer(
     corpus = "resolver_fuzzer_corpus",
     language = "C++",
     proto = "resolver_fuzzer.proto",
+    proto_deps = ["//test/core/util:fuzzing_channel_args_proto"],
     tags = [
         "no_mac",
         "no_windows",
@@ -38,6 +39,7 @@ grpc_proto_fuzzer(
         "//src/core:channel_args",
         "//test/core/event_engine:aborting_event_engine",
         "//test/core/event_engine/fuzzing_event_engine",
+        "//test/core/util:fuzzing_channel_args",
         "//test/core/util:grpc_test_util",
         "//test/core/util:grpc_test_util_base",
     ],

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer.cc

@@ -32,7 +32,6 @@
 #include "absl/strings/string_view.h"
 
 #include <grpc/event_engine/event_engine.h>
-#include <grpc/grpc.h>
 #include <grpc/support/log.h>
 
 #include "src/core/ext/filters/client_channel/resolver/dns/event_engine/event_engine_client_channel_resolver.h"
@@ -50,6 +49,7 @@
 #include "test/core/event_engine/fuzzing_event_engine/fuzzing_event_engine.pb.h"
 #include "test/core/event_engine/util/aborting_event_engine.h"
 #include "test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer.pb.h"
+#include "test/core/util/fuzzing_channel_args.h"
 
 bool squelch = true;
 static void dont_log(gpr_log_func_args* /*args*/) {}
@@ -246,18 +246,6 @@ class FuzzingResolverEventEngine
       "\"SimpleService\"}],\"waitForReady\":true}]}}]";
 };
 
-grpc_core::ChannelArgs ConstructChannelArgs(
-    const event_engine_client_channel_resolver::Msg& msg,
-    std::shared_ptr<FuzzingResolverEventEngine> engine) {
-  // put the engine in channel args
-  return grpc_core::ChannelArgs()
-      .SetObject<EventEngine>(std::move(engine))
-      .Set(GRPC_ARG_SERVICE_CONFIG_DISABLE_RESOLUTION,
-           !msg.resolver_args().request_service_config())
-      .Set(GRPC_ARG_DNS_ENABLE_SRV_QUERIES,
-           msg.resolver_args().enable_srv_queries());
-}
-
 class FuzzingResultHandler : public grpc_core::Resolver::ResultHandler {
  public:
   explicit FuzzingResultHandler(bool* done_resolving)
@@ -301,7 +289,10 @@ DEFINE_PROTO_FUZZER(const event_engine_client_channel_resolver::Msg& msg) {
     auto work_serializer = std::make_shared<grpc_core::WorkSerializer>();
     EventEngineClientChannelDNSResolverFactory resolver_factory;
     auto resolver_args = ConstructResolverArgs(
-        ConstructChannelArgs(msg, engine), &done_resolving, work_serializer);
+        grpc_core::testing::CreateChannelArgsFromFuzzingConfiguration(
+            msg.channel_args(), {})
+            .Set(GRPC_INTERNAL_ARG_EVENT_ENGINE, engine),
+        &done_resolving, work_serializer);
     auto resolver = resolver_factory.CreateResolver(std::move(resolver_args));
     work_serializer->Run(
         [resolver_ptr = resolver.get()]() ABSL_EXCLUSIVE_LOCKS_REQUIRED(

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer.proto

@@ -16,10 +16,7 @@ syntax = "proto3";
 
 package event_engine_client_channel_resolver;
 
-message ResolverArgs {
-    bool request_service_config = 2;
-    bool enable_srv_queries = 3;
-}
+import "test/core/util/fuzzing_channel_args.proto";
 
 message Error {
     uint32 code = 1;
@@ -74,7 +71,7 @@ enum ExecutionStep {
 }
 
 message Msg {
-    ResolverArgs resolver_args = 1;
+    grpc.testing.FuzzingChannelArgs channel_args = 1;
     oneof hostname {
         ResolvedAddresses hostname_response = 2;
         Error hostname_error = 3;

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer_corpus/crash-0dca225f566df998becb705fc3a6b33a2441b928

@@ -1,9 +1,14 @@
-resolver_args {
-  request_service_config: true
-  enable_srv_queries: true
-}
-hostname_response {
+channel_args {
+  args {
+    key: "grpc.dns_enable_srv_queries"
+    i: 1
+  }
+  args {
+    key: "grpc.service_config_disable_resolution"
+    i: 0
+  }
 }
+hostname_response {}
 txt_response {
   txt_records {
     fuzzed_service_config {
@@ -16,8 +21,7 @@ txt_response {
           value: 10
         }
       }
-      retry_throttling {
-      }
+      retry_throttling {}
     }
   }
 }

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer_corpus/crash-1f078e66afdaf4f9db6ac5704c15d6ee7150bd80

@@ -1,5 +1,8 @@
-resolver_args {
-  request_service_config: true
+channel_args {
+  args {
+    key: "grpc.service_config_disable_resolution"
+    i: 0
+  }
 }
 hostname_response {
 }

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer_corpus/crash-8a4668f3c812f8d7d0eb5e96493ba84fe77edfc2

@@ -1,5 +1,8 @@
-resolver_args {
-  request_service_config: true
+channel_args {
+  args {
+    key: "grpc.service_config_disable_resolution"
+    i: 0
+  }
 }
 txt_response {
   txt_records {

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer_corpus/timeout-1860f73b73574e91ce7b3cd8519cc0ec9753c5d8

@@ -1,5 +1,8 @@
-resolver_args {
-  enable_srv_queries: true
+channel_args {
+  args {
+    key: "grpc.dns_enable_srv_queries"
+    i: 1
+  }
 }
 hostname_response {
   addresses {

test/core/ext/filters/event_engine_client_channel_resolver/resolver_fuzzer_corpus/timeout-7a3822831087e0f79e2743c8f87650cc34a18898

@@ -1,5 +1,8 @@
-resolver_args {
-  enable_srv_queries: true
+channel_args {
+  args {
+    key: "grpc.dns_enable_srv_queries"
+    i: 1
+  }
 }
 txt_response {
 }