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#include <Poco/Util/AbstractConfiguration.h>
#include <Common/Macros.h>
#include <Common/Exception.h>
#include <Common/logger_useful.h>
#include <Core/ServerUUID.h>
#include <IO/WriteHelpers.h>
namespace DB
{
namespace ErrorCodes
{
extern const int SYNTAX_ERROR;
extern const int BAD_ARGUMENTS;
extern const int NO_ELEMENTS_IN_CONFIG;
}
Macros::Macros(const Poco::Util::AbstractConfiguration & config, const String & root_key, Poco::Logger * log)
{
Poco::Util::AbstractConfiguration::Keys keys;
config.keys(root_key, keys);
for (const String & key : keys)
{
macros[key] = config.getString(root_key + "." + key);
if (key == "database" || key == "table" || key == "uuid")
{
if (log)
LOG_WARNING(log,
"Config file contains '{}' macro. This macro has special meaning "
"and it's explicit definition is not recommended. Implicit unfolding for "
"'database', 'table' and 'uuid' macros will be disabled.",
key);
enable_special_macros = false;
}
}
}
String Macros::expand(const String & s,
MacroExpansionInfo & info) const
{
/// Do not allow recursion if we expand only special macros, because it will be infinite recursion
assert(info.level == 0 || !info.expand_special_macros_only);
if (s.find('{') == String::npos)
return s;
if (info.level && s.size() > 65536)
throw Exception(ErrorCodes::SYNTAX_ERROR, "Too long string while expanding macros");
if (info.level >= 10)
throw Exception(ErrorCodes::SYNTAX_ERROR, "Too deep recursion while expanding macros: '{}'", s);
/// If config file contains explicit special macro, then we do not expand it in this mode.
if (!enable_special_macros && info.expand_special_macros_only)
return s;
String res;
size_t pos = 0;
while (true)
{
size_t begin = s.find('{', pos);
if (begin == String::npos)
{
res.append(s, pos, String::npos);
break;
}
else
{
res.append(s, pos, begin - pos);
}
++begin;
size_t end = s.find('}', begin);
if (end == String::npos)
throw Exception(ErrorCodes::SYNTAX_ERROR, "Unbalanced {{ and }} in string with macros: '{}'", s);
String macro_name = s.substr(begin, end - begin);
auto it = macros.find(macro_name);
/// Prefer explicit macros over implicit.
if (it != macros.end() && !info.expand_special_macros_only)
{
res += it->second;
info.expanded_other = true;
}
else if (macro_name == "database" && !info.table_id.database_name.empty())
{
res += info.table_id.database_name;
info.expanded_database = true;
}
else if (macro_name == "table" && !info.table_id.table_name.empty())
{
res += info.table_id.table_name;
info.expanded_table = true;
}
else if (macro_name == "uuid" && !info.expand_special_macros_only)
{
if (info.table_id.uuid == UUIDHelpers::Nil)
throw Exception(ErrorCodes::BAD_ARGUMENTS, "Macro 'uuid' and empty arguments of ReplicatedMergeTree "
"are supported only for ON CLUSTER queries with Atomic database engine");
/// For ON CLUSTER queries we don't want to require all macros definitions in initiator's config.
/// However, initiator must check that for cross-replication cluster zookeeper_path does not contain {uuid} macro.
/// It becomes impossible to check if {uuid} is contained inside some unknown macro.
if (info.level)
throw Exception(ErrorCodes::SYNTAX_ERROR, "Macro 'uuid' should not be inside another macro");
res += toString(info.table_id.uuid);
info.expanded_uuid = true;
}
else if (macro_name == "server_uuid")
{
auto uuid = ServerUUID::get();
if (UUIDHelpers::Nil == uuid)
throw Exception(ErrorCodes::BAD_ARGUMENTS,
"Macro {server_uuid} expanded to zero, which means the UUID is not initialized (most likely it's not a server application)");
res += toString(uuid);
info.expanded_other = true;
}
else if (info.shard && macro_name == "shard")
{
res += *info.shard;
info.expanded_other = true;
}
else if (info.replica && macro_name == "replica")
{
res += *info.replica;
info.expanded_other = true;
}
else if (info.ignore_unknown || info.expand_special_macros_only)
{
if (info.expand_special_macros_only)
res += '{';
res += macro_name;
if (info.expand_special_macros_only)
res += '}';
info.has_unknown = true;
}
else
throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG, "No macro '{}' in config while processing substitutions in "
"'{}' at '{}' or macro is not supported here", macro_name, s, toString(begin));
pos = end + 1;
}
++info.level;
if (info.expand_special_macros_only)
return res;
return expand(res, info);
}
String Macros::getValue(const String & key) const
{
if (auto it = macros.find(key); it != macros.end())
return it->second;
throw Exception(ErrorCodes::NO_ELEMENTS_IN_CONFIG, "No macro {} in config", key);
}
String Macros::expand(const String & s) const
{
MacroExpansionInfo info;
return expand(s, info);
}
String Macros::expand(const String & s, const StorageID & table_id, bool allow_uuid) const
{
MacroExpansionInfo info;
info.table_id = table_id;
if (!allow_uuid)
info.table_id.uuid = UUIDHelpers::Nil;
return expand(s, info);
}
Names Macros::expand(const Names & source_names, size_t level) const
{
Names result_names;
result_names.reserve(source_names.size());
MacroExpansionInfo info;
for (const String & name : source_names)
{
info.level = level;
result_names.push_back(expand(name, info));
}
return result_names;
}
}
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