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Clean up server config parameter handling

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Removes helper classes which are no longer required.
This commit is contained in:
Esa Korhonen
2019-04-30 18:32:16 +03:00
parent d3a1f5c51f
commit 4e6ffc0381
6 changed files with 137 additions and 163 deletions
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1
include/maxscale/config.hh
View File

@ -451,6 +451,7 @@ public:
void remove(const std::string& key);
void clear();
bool empty() const;
ContainerType::const_iterator begin() const;
ContainerType::const_iterator end() const;

29
server/core/config.cc
View File

@ -2212,6 +2212,11 @@ void MXS_CONFIG_PARAMETER::clear()
m_contents.clear();
}
bool MXS_CONFIG_PARAMETER::empty() const
{
return m_contents.empty();
}
MXS_CONFIG_PARAMETER::ContainerType::const_iterator MXS_CONFIG_PARAMETER::begin() const
{
return m_contents.begin();
@ -3817,34 +3822,24 @@ void config_add_module_params_json(const MXS_CONFIG_PARAMETER* parameters,
const MXS_MODULE_PARAM* module_params,
json_t* output)
{
// Create a map of the config values to ease their extraction
std::unordered_map<std::string, std::string> params;
for (const auto& elem : *parameters)
{
params[elem.first] = elem.second;
}
for (const auto* param_info : {basic_params, module_params})
{
for (int i = 0; param_info[i].name; i++)
{
if (ignored_params.count(param_info[i].name) == 0
&& !json_object_get(output, param_info[i].name))
const string param_name = param_info[i].name;
if (ignored_params.count(param_name) == 0 && !json_object_get(output, param_name.c_str()))
{
if (params.count(param_info[i].name) > 0)
if (parameters->contains(param_name))
{
const string name = param_info[i].name;
const string value = params[name];
json_object_set_new(output, name.c_str(),
param_value_to_json(&param_info[i], name,
value));
const string value = parameters->get_string(param_name);
json_object_set_new(output, param_name.c_str(),
param_value_to_json(&param_info[i], param_name, value));
}
else
{
// The parameter was not set in config and does not have a default value.
// Print a null value.
json_object_set_new(output, param_info[i].name, json_null());
json_object_set_new(output, param_name.c_str(), json_null());
}
}
}

65
server/core/config_runtime.cc
View File

@ -576,57 +576,60 @@ bool runtime_alter_server(Server* server, const char* key, const char* value)
return false;
}
const MXS_MODULE* mod = get_module(server->protocol().c_str(), MODULE_PROTOCOL);
bool is_normal_parameter = !server->is_custom_parameter(key);
// As servers allow unknown parameters, we must only validate known parameters
if (param_is_known(config_server_params, mod->parameters, key)
&& !param_is_valid(config_server_params, mod->parameters, key, value))
// Only validate known parameters as custom parameters cannot be validated.
if (is_normal_parameter)
{
const MXS_MODULE* mod = get_module(server->protocol().c_str(), MODULE_PROTOCOL);
if (!param_is_valid(config_server_params, mod->parameters, key, value))
{
config_runtime_error("Invalid value for parameter '%s': %s", key, value);
return false;
}
if (strcmp(key, CN_DISK_SPACE_THRESHOLD) == 0)
{
// This cannot be safely modified during runtime since the monitor thread could be reading the
// value. TODO: To enable this, the threshold value needs to be moved to the private Server-class
// so that locking can be enforced on any access.
config_runtime_error("The server parameter '%s' cannot be modified during runtime.",
CN_DISK_SPACE_THRESHOLD);
return false;
}
std::lock_guard<std::mutex> guard(crt_lock);
server->set_parameter(key, value);
bool setting_changed = false;
if (is_normal_parameter)
{
// Only some normal parameters can be changed runtime. The key/value-combination has already
// been checked to be valid.
if (strcmp(key, CN_ADDRESS) == 0 || strcmp(key, CN_SOCKET) == 0)
{
server->server_update_address(value);
setting_changed = true;
}
else if (strcmp(key, CN_PORT) == 0)
{
if (int ival = get_positive_int(value))
{
server->update_port(ival);
setting_changed = true;
}
}
else if (strcmp(key, CN_EXTRA_PORT) == 0)
{
server->update_extra_port(atoi(value));
setting_changed = true;
}
else if (strcmp(key, CN_MONITORUSER) == 0)
{
server->set_monitor_user(value);
setting_changed = true;
}
else if (strcmp(key, CN_MONITORPW) == 0)
{
server->set_monitor_password(value);
setting_changed = true;
}
else if (strcmp(key, CN_PERSISTPOOLMAX) == 0)
{
if (is_valid_integer(value))
{
server->set_persistpoolmax(atoi(value));
setting_changed = true;
}
}
else if (strcmp(key, CN_PERSISTMAXTIME) == 0)
@ -634,15 +637,16 @@ bool runtime_alter_server(Server* server, const char* key, const char* value)
if (is_valid_integer(value))
{
server->set_persistmaxtime(atoi(value));
setting_changed = true;
}
}
if (strcmp(key, CN_RANK) == 0)
else if (strcmp(key, CN_RANK) == 0)
{
auto v = config_enum_to_value(value, rank_values);
if (v != MXS_UNKNOWN_ENUM_VALUE)
{
server->set_rank(v);
setting_changed = true;
}
else
{
@ -651,17 +655,32 @@ bool runtime_alter_server(Server* server, const char* key, const char* value)
}
else
{
/**
* It's likely that this parameter is used as a weighting parameter.
* We need to update the weights of services that use this.
*/
service_update_weights();
// Was a recognized parameter but runtime modification is not supported.
config_runtime_error("Server parameter '%s' cannot be modified during runtime. A similar "
"effect can be produced by destroying the server and recreating it "
"with the new settings.", key);
}
if (setting_changed)
{
// Successful modification of a normal parameter, write to text storage.
server->set_normal_parameter(key, value);
}
}
else
{
// This is a custom parameter and may be used for weighting. Update the weights of services.
server->set_custom_parameter(key, value);
service_update_weights();
setting_changed = true;
}
if (setting_changed)
{
server->serialize();
MXS_NOTICE("Updated server '%s': %s=%s", server->name(), key, value);
return true;
}
return setting_changed;
}
static bool undefined_mandatory_parameter(const MXS_MODULE_PARAM* mod_params,

23
server/core/internal/server.hh
View File

@ -36,12 +36,6 @@ public:
m_settings.authenticator = authenticator;
}
struct ConfigParameter
{
std::string name;
std::string value;
};
long persistpoolmax() const
{
return m_settings.persistpoolmax;
@ -186,10 +180,10 @@ public:
static Server* find_by_unique_name(const std::string& name);
/**
* Test if name is a normal server setting name.
* Test if name is not a normal server setting name.
*
* @param name Name to check
* @return True if name is a standard parameter
* @return True if name is not a standard parameter
*/
bool is_custom_parameter(const std::string& name) const;
@ -241,16 +235,17 @@ public:
static json_t* server_json_attributes(const Server* server);
/**
* @brief Set server parameter
* Set server custom parameter.
*
* @param server Server to update
* @param name Parameter to set
* @param value Value of parameter
*/
void set_parameter(const std::string& name, const std::string& value);
void set_custom_parameter(const std::string& name, const std::string& value);
std::string get_custom_parameter(const std::string& name) const override;
void set_normal_parameter(const std::string& name, const std::string& value);
/**
* @brief Serialize a server to a file
*
@ -330,7 +325,7 @@ private:
/** All config settings in text form. This is only read and written from the admin thread
* so no need for locking. */
std::vector<ConfigParameter> all_parameters;
MXS_CONFIG_PARAMETER all_parameters;
std::string protocol; /**< Backend protocol module name. Does not change so needs no locking. */
std::string authenticator; /**< Authenticator module name. Does not change so needs no locking. */
@ -347,9 +342,9 @@ private:
* by mutex. */
DiskSpaceLimits disk_space_limits;
/** Additional custom parameters which may affect routing decisions or the monitor module.
/** Additional custom parameters which may affect routing decisions or a monitor.
* Can be queried from modules at any time so access must be protected by mutex. */
std::map<std::string, std::string> custom_parameters;
MXS_CONFIG_PARAMETER custom_parameters;
};
/**

91
server/core/server.cc
View File

@ -122,34 +122,6 @@ ThisUnit this_unit;
const char ERR_TOO_LONG_CONFIG_VALUE[] = "The new value for %s is too long. Maximum length is %i characters.";
// Converts Server::ConfigParam to MXS_CONFIG_PARAM and keeps them in the same order. Required for some
// functions taking MXS_CONFIG_PARAMs as arguments.
class ParamAdaptor
{
public:
ParamAdaptor(const std::vector<Server::ConfigParameter>& parameters)
{
m_params = new MXS_CONFIG_PARAMETER;
for (const auto& elem : parameters)
{
m_params->set(elem.name, elem.value);
}
}
~ParamAdaptor()
{
delete m_params;
}
operator MXS_CONFIG_PARAMETER*()
{
return m_params;
}
private:
MXS_CONFIG_PARAMETER* m_params = nullptr;
};
/**
* Write to char array by first zeroing any extra space. This reduces effects of concurrent reading.
* Concurrent writing should be prevented by the caller.
@ -273,14 +245,14 @@ Server* Server::server_alloc(const char* name, MXS_CONFIG_PARAMETER* params)
server->set_monitor_password(monpw);
}
server->m_settings.all_parameters = *params;
for (auto p : *params)
{
const string name = p.first;
const string value = p.second;
server->m_settings.all_parameters.push_back({name, value});
if (server->is_custom_parameter(name))
const string& param_name = p.first;
const string& param_value = p.second;
if (server->is_custom_parameter(param_name))
{
server->set_parameter(name, value);
server->set_custom_parameter(param_name, param_value);
}
}
@ -522,7 +494,7 @@ void Server::print_to_dcb(DCB* dcb) const
for (const auto& elem : server->m_settings.all_parameters)
{
dcb_printf(dcb, "\t %s\t%s\n",
elem.name.c_str(), elem.value.c_str());
elem.first.c_str(), elem.second.c_str());
}
}
dcb_printf(dcb, "\tNumber of connections: %d\n", server->stats.n_connections);
@ -757,37 +729,23 @@ string Server::monitor_password() const
return m_settings.monpw;
}
void Server::set_parameter(const string& name, const string& value)
void Server::set_custom_parameter(const string& name, const string& value)
{
// Set/add the parameter in both containers
bool found = false;
for (auto& elem : m_settings.all_parameters)
{
if (name == elem.name)
{
found = true;
elem.value = value; // Update
break;
}
}
if (!found)
{
m_settings.all_parameters.push_back({name, value});
}
std::lock_guard<std::mutex> guard(m_settings.lock);
m_settings.custom_parameters[name] = value;
// Set/add the parameter in both containers.
m_settings.all_parameters.set(name, value);
Guard guard(m_settings.lock);
m_settings.custom_parameters.set(name, value);
}
string Server::get_custom_parameter(const string& name) const
{
string rval;
std::lock_guard<std::mutex> guard(m_settings.lock);
auto iter = m_settings.custom_parameters.find(name);
if (iter != m_settings.custom_parameters.end())
{
rval = iter->second;
}
return rval;
Guard guard(m_settings.lock);
return m_settings.custom_parameters.get_string(name);
}
void Server::set_normal_parameter(const std::string& name, const std::string& value)
{
m_settings.all_parameters.set(name, value);
}
/**
@ -898,15 +856,19 @@ bool Server::create_server_config(const Server* server, const char* filename)
// TODO: Check for return values on all of the dprintf calls
const MXS_MODULE* mod = get_module(server->m_settings.protocol.c_str(), MODULE_PROTOCOL);
string config = generate_config_string(server->name(),
*ParamAdaptor(server->m_settings.all_parameters),
server->m_settings.all_parameters,
config_server_params,
mod->parameters);
// Print custom parameters
// Print custom parameters. The generate_config_string()-call doesn't print them.
{
Guard guard(server->m_settings.lock);
for (const auto& elem : server->m_settings.custom_parameters)
{
config += elem.first + "=" + elem.second + "\n";
}
}
if (dprintf(file, "%s", config.c_str()) == -1)
{
@ -1029,13 +991,15 @@ json_t* Server::server_json_attributes(const Server* server)
json_t* params = json_object();
const MXS_MODULE* mod = get_module(server->m_settings.protocol.c_str(), MODULE_PROTOCOL);
config_add_module_params_json(ParamAdaptor(server->m_settings.all_parameters),
config_add_module_params_json(&server->m_settings.all_parameters,
{CN_TYPE},
config_server_params,
mod->parameters,
params);
// Add weighting parameters that weren't added by config_add_module_params_json
{
Guard guard(server->m_settings.lock);
for (const auto& elem : server->m_settings.custom_parameters)
{
if (!json_object_get(params, elem.first.c_str()))
@ -1043,6 +1007,7 @@ json_t* Server::server_json_attributes(const Server* server)
json_object_set_new(params, elem.first.c_str(), json_string(elem.second.c_str()));
}
}
}
json_object_set_new(attr, CN_PARAMETERS, params);

3
server/core/test/test_server.cc
View File

@ -51,7 +51,6 @@ static MXS_CONFIG_PARAMETER* params = new MXS_CONFIG_PARAMETER;
*/
static int test1()
{
int result;
std::string status;
/* Server tests */
@ -62,7 +61,7 @@ static int test1()
fprintf(stderr, "\t..done\nTest Parameter for Server.");
mxb_assert_message(server->get_custom_parameter("name").empty(),
"Parameter should be empty when not set");
server->set_parameter("name", "value");
server->set_custom_parameter("name", "value");
std::string buf = server->get_custom_parameter("name");
mxb_assert_message(buf == "value", "Parameter should be returned correctly");
fprintf(stderr, "\t..done\nTesting Unique Name for Server.");