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87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
#pragma once
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#include <Poco/Net/IPAddress.h>
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#include <Poco/Net/SocketAddress.h>
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#include <memory>
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#include <base/types.h>
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#include <Core/Names.h>
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#include <boost/noncopyable.hpp>
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#include <Common/LoggingFormatStringHelpers.h>
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namespace Poco { class Logger; }
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namespace DB
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{
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/// A singleton implementing DNS names resolving with optional DNS cache
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/// The cache is being updated asynchronous in separate thread (see DNSCacheUpdater)
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/// or it could be updated manually via drop() method.
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class DNSResolver : private boost::noncopyable
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{
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public:
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using IPAddresses = std::vector<Poco::Net::IPAddress>;
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using IPAddressesPtr = std::shared_ptr<IPAddresses>;
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static DNSResolver & instance();
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DNSResolver(const DNSResolver &) = delete;
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/// Accepts host names like 'example.com' or '127.0.0.1' or '::1' and resolves its IP
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Poco::Net::IPAddress resolveHost(const std::string & host);
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/// Accepts host names like 'example.com' or '127.0.0.1' or '::1' and resolves all its IPs
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IPAddresses resolveHostAll(const std::string & host);
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/// Accepts host names like 'example.com:port' or '127.0.0.1:port' or '[::1]:port' and resolves its IP and port
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Poco::Net::SocketAddress resolveAddress(const std::string & host_and_port);
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Poco::Net::SocketAddress resolveAddress(const std::string & host, UInt16 port);
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std::vector<Poco::Net::SocketAddress> resolveAddressList(const std::string & host, UInt16 port);
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/// Accepts host IP and resolves its host names
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std::unordered_set<String> reverseResolve(const Poco::Net::IPAddress & address);
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/// Get this server host name
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String getHostName();
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/// Disables caching
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void setDisableCacheFlag(bool is_disabled = true);
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/// Drops all caches
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void dropCache();
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/// Removes an entry from cache or does nothing
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void removeHostFromCache(const std::string & host);
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/// Updates all known hosts in cache.
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/// Returns true if IP of any host has been changed or an element was dropped (too many failures)
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bool updateCache(UInt32 max_consecutive_failures);
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~DNSResolver();
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private:
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template <typename UpdateF, typename ElemsT>
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bool updateCacheImpl(
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UpdateF && update_func,
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ElemsT && elems,
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UInt32 max_consecutive_failures,
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FormatStringHelper<String> notfound_log_msg,
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FormatStringHelper<String> dropped_log_msg);
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DNSResolver();
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struct Impl;
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std::unique_ptr<Impl> impl;
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LoggerPtr log;
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/// Updates cached value and returns true it has been changed.
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bool updateHost(const String & host);
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bool updateAddress(const Poco::Net::IPAddress & address);
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void addToNewHosts(const String & host);
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void addToNewAddresses(const Poco::Net::IPAddress & address);
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};
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}
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