1 files changed, 109 insertions, 0 deletions
diff --git a/src/test/crimson/test_config.cc b/src/test/crimson/test_config.cc
new file mode 100644
index 000000000..7541c0931
--- /dev/null
+++ b/src/test/crimson/test_config.cc
@@ -0,0 +1,109 @@
+#include <chrono>
+#include <string>
+#include <numeric>
+#include <seastar/core/app-template.hh>
+#include <seastar/core/sharded.hh>
+#include "common/ceph_argparse.h"
+#include "common/config_obs.h"
+#include "crimson/common/config_proxy.h"
+
+using namespace std::literals;
+using Config = crimson::common::ConfigProxy;
+const std::string test_uint_option = "osd_max_pgls";
+const uint64_t INVALID_VALUE = (uint64_t)(-1);
+const uint64_t EXPECTED_VALUE = 42;
+
+class ConfigObs : public ceph::md_config_obs_impl<Config> {
+  uint64_t last_change = INVALID_VALUE;
+  uint64_t num_changes = 0;
+
+  const char** get_tracked_conf_keys() const override {
+    static const char* keys[] = {
+      test_uint_option.c_str(),
+      nullptr,
+    };
+    return keys;
+  }
+  void handle_conf_change(const Config& conf,
+                          const std::set <std::string> &changes) override{
+    if (changes.count(test_uint_option)) {
+      last_change = conf.get_val<uint64_t>(test_uint_option);
+      num_changes += 1;
+    }
+  }
+public:
+  ConfigObs() {
+    crimson::common::local_conf().add_observer(this);
+  }
+
+  uint64_t get_last_change() const { return last_change; }
+  uint64_t get_num_changes() const { return num_changes; }
+  seastar::future<> stop() {
+    crimson::common::local_conf().remove_observer(this);
+    return seastar::make_ready_future<>();
+  }
+};
+
+seastar::sharded<ConfigObs> sharded_cobs;
+
+static seastar::future<> test_config()
+{
+  return crimson::common::sharded_conf().start(EntityName{}, "ceph"sv).then([] {
+    std::vector<const char*> args;
+    std::string cluster;
+    std::string conf_file_list;
+    auto init_params = ceph_argparse_early_args(args,
+                                                CEPH_ENTITY_TYPE_CLIENT,
+                                                &cluster,
+                                                &conf_file_list);
+    auto& conf = crimson::common::local_conf();
+    conf->name = init_params.name;
+    conf->cluster = cluster;
+    return conf.parse_config_files(conf_file_list);
+  }).then([] {
+    return crimson::common::sharded_conf().invoke_on(0, &Config::start);
+  }).then([] {
+    return sharded_cobs.start();
+  }).then([] {
+    auto& conf = crimson::common::local_conf();
+    return conf.set_val(test_uint_option, std::to_string(EXPECTED_VALUE));
+  }).then([] {
+    return crimson::common::sharded_conf().invoke_on_all([](Config& config) {
+      if (config.get_val<uint64_t>(test_uint_option) != EXPECTED_VALUE) {
+        throw std::runtime_error("configurations don't match");
+      }
+      if (sharded_cobs.local().get_last_change() != EXPECTED_VALUE) {
+        throw std::runtime_error("last applied changes don't match the latest config");
+      }
+      if (sharded_cobs.local().get_num_changes() != 1) {
+        throw std::runtime_error("num changes don't match actual changes");
+      }
+    });
+  }).finally([] {
+    return sharded_cobs.stop();
+  }).finally([] {
+    return crimson::common::sharded_conf().stop();
+  });
+}
+
+int main(int argc, char** argv)
+{
+  seastar::app_template app;
+  return app.run(argc, argv, [&] {
+    return test_config().then([] {
+      std::cout << "All tests succeeded" << std::endl;
+    }).handle_exception([] (auto eptr) {
+      std::cout << "Test failure" << std::endl;
+      return seastar::make_exception_future<>(eptr);
+    });
+  });
+}
+
+
+/*
+ * Local Variables:
+ * compile-command: "make -j4 \
+ * -C ../../../build \
+ * unittest_seastar_config"
+ * End:
+ */