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Provider options module
This commit introduces provider_options module which acts as a proxy between application and wsrep provider library. When initialized, the provider options are read from the provider through config service api extension. A lookup table with current values and defaults is constructed. Parameter names are mapped so that dots in provider parameter names are transformed to underscores.
This commit is contained in:
Teemu Ollakka
committed by
Daniele Sciascia
Daniele Sciascia
parent
344544df3e
commit
453b81c6a7
174
src/config_service_v1.cpp
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174
src/config_service_v1.cpp
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/*
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* Copyright (C) 2022 Codership Oy <info@codership.com>
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*
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* This file is part of wsrep-lib.
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*
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* Wsrep-lib is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* Wsrep-lib is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with wsrep-lib. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config_service_v1.hpp"
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#include "service_helpers.hpp"
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#include "v26/wsrep_config_service.h"
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#include "wsrep/logger.hpp"
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#include "wsrep/provider_options.hpp"
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namespace wsrep_config_service_v1
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{
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wsrep_config_service_v1_t service{ 0 };
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static int map_flags(int flags)
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{
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int option_flags = 0;
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if (flags & WSREP_PARAM_DEPRECATED)
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option_flags |= wsrep::provider_options::flag::deprecated;
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if (flags & WSREP_PARAM_READONLY)
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option_flags |= wsrep::provider_options::flag::readonly;
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if (flags & WSREP_PARAM_TYPE_BOOL)
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option_flags |= wsrep::provider_options::flag::type_bool;
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if (flags & WSREP_PARAM_TYPE_INTEGER)
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option_flags |= wsrep::provider_options::flag::type_integer;
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if (flags & WSREP_PARAM_TYPE_DOUBLE)
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option_flags |= wsrep::provider_options::flag::type_double;
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return option_flags;
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}
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static enum wsrep::provider::status
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make_option(wsrep::provider_options* opt, const char* name, const char* val,
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int flags)
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{
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std::unique_ptr<wsrep::provider_options::option_value> value(
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new wsrep::provider_options::option_value_string(val));
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std::unique_ptr<wsrep::provider_options::option_value> default_value(
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new wsrep::provider_options::option_value_string(val));
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return opt->set_default(name, std::move(value),
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std::move(default_value), flags);
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}
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static enum wsrep::provider::status
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make_option(wsrep::provider_options* opt, const char* name, int64_t val,
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int flags)
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{
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std::unique_ptr<wsrep::provider_options::option_value> value(
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new wsrep::provider_options::option_value_int(val));
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std::unique_ptr<wsrep::provider_options::option_value> default_value(
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new wsrep::provider_options::option_value_int(val));
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return opt->set_default(name, std::move(value),
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std::move(default_value), flags);
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}
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static enum wsrep::provider::status
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make_option(wsrep::provider_options* opt, const char* name, bool val,
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int flags)
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{
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std::unique_ptr<wsrep::provider_options::option_value> value(
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new wsrep::provider_options::option_value_bool(val));
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std::unique_ptr<wsrep::provider_options::option_value> default_value(
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new wsrep::provider_options::option_value_bool(val));
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return opt->set_default(name, std::move(value),
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std::move(default_value), flags);
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}
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static enum wsrep::provider::status
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make_option(wsrep::provider_options* opt, const char* name, double val,
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int flags)
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{
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std::unique_ptr<wsrep::provider_options::option_value> value(
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new wsrep::provider_options::option_value_double(val));
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std::unique_ptr<wsrep::provider_options::option_value> default_value(
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new wsrep::provider_options::option_value_double(val));
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return opt->set_default(name, std::move(value),
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std::move(default_value), flags);
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}
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wsrep_status_t service_callback(const wsrep_parameter* p, void* context)
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{
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const int flags = map_flags(p->flags);
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enum wsrep::provider::status ret(wsrep::provider::error_unknown);
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wsrep::provider_options* options = (wsrep::provider_options*)context;
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switch (p->flags & WSREP_PARAM_TYPE_MASK)
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{
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case WSREP_PARAM_TYPE_BOOL:
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ret = make_option(options, p->name, p->value.as_bool, flags);
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break;
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case WSREP_PARAM_TYPE_INTEGER:
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ret = make_option(options, p->name, p->value.as_integer, flags);
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break;
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case WSREP_PARAM_TYPE_DOUBLE:
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ret = make_option(options, p->name, p->value.as_double, flags);
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break;
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default:
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assert((p->flags & WSREP_PARAM_TYPE_MASK) == 0);
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ret = make_option(options, p->name, p->value.as_string, flags);
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break;
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}
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if (ret == wsrep::provider::success)
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return WSREP_OK;
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else
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return WSREP_FATAL;
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}
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} // namespace wsrep_config_service_v1
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static int config_service_v1_probe(void* dlh)
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{
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typedef int (*init_fn)(wsrep_config_service_v1_t*);
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typedef void (*deinit_fn)();
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return wsrep_impl::service_probe<init_fn>(
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dlh, WSREP_CONFIG_SERVICE_INIT_FUNC_V1, "config service v1")
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|| wsrep_impl::service_probe<deinit_fn>(
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dlh, WSREP_CONFIG_SERVICE_DEINIT_FUNC_V1, "config service v1");
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}
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static int config_service_v1_init(void* dlh)
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{
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typedef int (*init_fn)(wsrep_config_service_v1_t*);
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return wsrep_impl::service_init<init_fn>(
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dlh, WSREP_CONFIG_SERVICE_INIT_FUNC_V1,
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&wsrep_config_service_v1::service, "config service v1");
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}
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static void config_service_v1_deinit(void* dlh)
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{
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typedef int (*deinit_fn)();
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wsrep_impl::service_deinit<deinit_fn>(
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dlh, WSREP_CONFIG_SERVICE_DEINIT_FUNC_V1, "config service v1");
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}
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int wsrep::config_service_v1_fetch(wsrep::provider& provider,
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wsrep::provider_options* options)
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{
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struct wsrep_st* wsrep = (struct wsrep_st*)provider.native();
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if (config_service_v1_probe(wsrep->dlh))
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{
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wsrep::log_warning() << "Provider does not support config service v1";
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return 1;
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}
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if (config_service_v1_init(wsrep->dlh))
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{
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wsrep::log_warning() << "Failed to initialize config service v1";
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return 1;
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}
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wsrep_status_t ret = wsrep_config_service_v1::service.get_parameters(
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wsrep, &wsrep_config_service_v1::service_callback, options);
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config_service_v1_deinit(wsrep->dlh);
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if (ret != WSREP_OK)
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{
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return 1;
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}
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return 0;
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}
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