1 files changed, 93 insertions, 0 deletions
diff --git a/src/crimson/common/config_proxy.cc b/src/crimson/common/config_proxy.cc
new file mode 100644
index 000000000..88d4679d5
--- /dev/null
+++ b/src/crimson/common/config_proxy.cc
@@ -0,0 +1,93 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab
+
+#include "config_proxy.h"
+
+#include <filesystem>
+
+#include "crimson/common/buffer_io.h"
+
+namespace crimson::common {
+
+ConfigProxy::ConfigProxy(const EntityName& name, std::string_view cluster)
+{
+  if (seastar::this_shard_id() != 0) {
+    return;
+  }
+  // set the initial value on CPU#0
+  values.reset(seastar::make_lw_shared<ConfigValues>());
+  values.get()->name = name;
+  values.get()->cluster = cluster;
+  // and the only copy of md_config_impl<> is allocated on CPU#0
+  local_config.reset(new md_config_t{*values, obs_mgr, true});
+  if (name.is_mds()) {
+    local_config->set_val_default(*values, obs_mgr,
+				  "keyring", "$mds_data/keyring");
+  } else if (name.is_osd()) {
+    local_config->set_val_default(*values, obs_mgr,
+				  "keyring", "$osd_data/keyring");
+  }
+}
+
+seastar::future<> ConfigProxy::start()
+{
+  // populate values and config to all other shards
+  if (!values) {
+    return seastar::make_ready_future<>();
+  }
+  return container().invoke_on_others([this](auto& proxy) {
+    return values.copy().then([config=local_config.get(),
+			       &proxy](auto foreign_values) {
+      proxy.values.reset();
+      proxy.values = std::move(foreign_values);
+      proxy.remote_config = config;
+      return seastar::make_ready_future<>();
+    });
+  });
+}
+
+void ConfigProxy::show_config(ceph::Formatter* f) const {
+  get_config().show_config(*values, f);
+}
+
+seastar::future<> ConfigProxy::parse_config_files(const std::string& conf_files)
+{
+  auto conffile_paths =
+    get_config().get_conffile_paths(*values,
+                                    conf_files.empty() ? nullptr : conf_files.c_str(),
+                                    &std::cerr,
+                                    CODE_ENVIRONMENT_DAEMON);
+  return seastar::do_with(std::move(conffile_paths), [this] (auto& paths) {
+    return seastar::repeat([path=paths.begin(), e=paths.end(), this]() mutable {
+      if (path == e) {
+        // tried all conffile, none of them works
+        return seastar::make_ready_future<seastar::stop_iteration>(
+          seastar::stop_iteration::yes);
+      }
+      return crimson::read_file(*path++).then([this](auto&& buf) {
+        return do_change([buf=std::move(buf), this](ConfigValues& values) {
+          if (get_config().parse_buffer(values, obs_mgr,
+                                        buf.get(), buf.size(),
+                                        &std::cerr) == 0) {
+            get_config().update_legacy_vals(values);
+          } else {
+            throw std::invalid_argument("parse error");
+          }
+        }).then([] {
+          // this one works!
+	  return seastar::make_ready_future<seastar::stop_iteration>(
+            seastar::stop_iteration::yes);
+        });
+      }).handle_exception_type([] (const std::filesystem::filesystem_error&) {
+        return seastar::make_ready_future<seastar::stop_iteration>(
+          seastar::stop_iteration::no);
+      }).handle_exception_type([] (const std::invalid_argument&) {
+        return seastar::make_ready_future<seastar::stop_iteration>(
+         seastar::stop_iteration::no);
+      });
+    });
+  });
+}
+
+ConfigProxy::ShardedConfig ConfigProxy::sharded_conf;
+}