ClickHouse/dbms/src/Dictionaries/MongoDBDictionarySource.cpp
Marek Vavruša 2ac5a743cc dbms: fix build with OS X built-in clang
The built-in clang doesn’t support value() for
`std::experimental::optional`. It however supports
dereference operator, which is basically the
same thing:

```
/clickhouse/dbms/src/DataStreams/NullableAdapterBlockInputStream.cpp:83:67: error: call to unavailable member function 'value':
                    res.insert({elem.column, elem.type, rename[i].value()});
                                                        ~~~~~~~~~~^~~~~
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/experimental/optional:547:17: note: candidate function has been explicitly made unavailable
    value_type& value()
                ^
/Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/include/c++/v1/experimental/optional:539:33: note: candidate function has been explicitly made unavailable
    constexpr value_type const& value() const
```
2017-10-13 18:12:29 -07:00

278 lines
10 KiB
C++

#include <Common/config.h>
#if Poco_MongoDB_FOUND
#include <Poco/Util/AbstractConfiguration.h>
#include <Poco/MD5Engine.h>
#include <Poco/MongoDB/Connection.h>
#include <Poco/MongoDB/Database.h>
#include <Poco/MongoDB/Cursor.h>
#include <Poco/MongoDB/Array.h>
#include <Poco/Version.h>
// only after poco
// naming conflict:
// Poco/MongoDB/BSONWriter.h:54: void writeCString(const std::string& value);
// dbms/src/IO/WriteHelpers.h:146 #define writeCString(s, buf)
#include <Dictionaries/MongoDBDictionarySource.h>
#include <Dictionaries/MongoDBBlockInputStream.h>
#include <Core/FieldVisitors.h>
#include <ext/enumerate.h>
namespace DB
{
namespace ErrorCodes
{
extern const int UNSUPPORTED_METHOD;
extern const int WRONG_PASSWORD;
extern const int MONGODB_CANNOT_AUTHENTICATE;
}
static const size_t max_block_size = 8192;
#if POCO_VERSION < 0x01070800
/// See https://pocoproject.org/forum/viewtopic.php?f=10&t=6326&p=11426&hilit=mongodb+auth#p11485
static void authenticate(Poco::MongoDB::Connection & connection,
const std::string & database, const std::string & user, const std::string & password)
{
Poco::MongoDB::Database db(database);
/// Challenge-response authentication.
std::string nonce;
/// First step: request nonce.
{
auto command = db.createCommand();
command->setNumberToReturn(1);
command->selector().add<Int32>("getnonce", 1);
Poco::MongoDB::ResponseMessage response;
connection.sendRequest(*command, response);
if (response.documents().empty())
throw Exception("Cannot authenticate in MongoDB: server returned empty response for 'getnonce' command",
ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
auto doc = response.documents()[0];
try
{
double ok = doc->get<double>("ok", 0);
if (ok != 1)
throw Exception("Cannot authenticate in MongoDB: server returned response for 'getnonce' command that"
" has field 'ok' missing or having wrong value", ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
nonce = doc->get<std::string>("nonce", "");
if (nonce.empty())
throw Exception("Cannot authenticate in MongoDB: server returned response for 'getnonce' command that"
" has field 'nonce' missing or empty", ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
}
catch (Poco::NotFoundException & e)
{
throw Exception("Cannot authenticate in MongoDB: server returned response for 'getnonce' command that has missing required field: "
+ e.displayText(), ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
}
}
/// Second step: use nonce to calculate digest and send it back to the server.
/// Digest is hex_md5(n.nonce + username + hex_md5(username + ":mongo:" + password))
{
std::string first = user + ":mongo:" + password;
Poco::MD5Engine md5;
md5.update(first);
std::string digest_first(Poco::DigestEngine::digestToHex(md5.digest()));
std::string second = nonce + user + digest_first;
md5.reset();
md5.update(second);
std::string digest_second(Poco::DigestEngine::digestToHex(md5.digest()));
auto command = db.createCommand();
command->setNumberToReturn(1);
command->selector()
.add<Int32>("authenticate", 1)
.add<std::string>("user", user)
.add<std::string>("nonce", nonce)
.add<std::string>("key", digest_second);
Poco::MongoDB::ResponseMessage response;
connection.sendRequest(*command, response);
if (response.empty())
throw Exception("Cannot authenticate in MongoDB: server returned empty response for 'authenticate' command",
ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
auto doc = response.documents()[0];
try
{
double ok = doc->get<double>("ok", 0);
if (ok != 1)
throw Exception("Cannot authenticate in MongoDB: server returned response for 'authenticate' command that"
" has field 'ok' missing or having wrong value", ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
}
catch (Poco::NotFoundException & e)
{
throw Exception("Cannot authenticate in MongoDB: server returned response for 'authenticate' command that has missing required field: "
+ e.displayText(), ErrorCodes::MONGODB_CANNOT_AUTHENTICATE);
}
}
}
#endif
MongoDBDictionarySource::MongoDBDictionarySource(
const DictionaryStructure & dict_struct, const std::string & host, UInt16 port,
const std::string & user, const std::string & password,
const std::string & method,
const std::string & db, const std::string & collection,
const Block & sample_block)
: dict_struct{dict_struct}, host{host}, port{port}, user{user}, password{password},
method{method},
db{db}, collection{collection}, sample_block{sample_block},
connection{std::make_shared<Poco::MongoDB::Connection>(host, port)}
{
if (!user.empty())
{
#if POCO_VERSION >= 0x01070800
Poco::MongoDB::Database poco_db(db);
poco_db.authenticate(*connection, user, password, method.empty() ? Poco::MongoDB::Database::AUTH_SCRAM_SHA1 : method);
#else
authenticate(*connection, db, user, password);
#endif
}
}
MongoDBDictionarySource::MongoDBDictionarySource(
const DictionaryStructure & dict_struct, const Poco::Util::AbstractConfiguration & config,
const std::string & config_prefix, Block & sample_block)
: MongoDBDictionarySource(
dict_struct,
config.getString(config_prefix + ".host"),
config.getUInt(config_prefix + ".port"),
config.getString(config_prefix + ".user", ""),
config.getString(config_prefix + ".password", ""),
config.getString(config_prefix + ".method", ""),
config.getString(config_prefix + ".db", ""),
config.getString(config_prefix + ".collection"),
sample_block)
{
}
MongoDBDictionarySource::MongoDBDictionarySource(const MongoDBDictionarySource & other)
: MongoDBDictionarySource{
other.dict_struct, other.host, other.port, other.user, other.password,
other.method,
other.db, other.collection, other.sample_block}
{
}
MongoDBDictionarySource::~MongoDBDictionarySource() = default;
static std::unique_ptr<Poco::MongoDB::Cursor> createCursor(
const std::string & database, const std::string & collection, const Block & sample_block_to_select)
{
auto cursor = std::make_unique<Poco::MongoDB::Cursor>(database, collection);
/// Looks like selecting _id column is implicit by default.
if (!sample_block_to_select.has("_id"))
cursor->query().returnFieldSelector().add("_id", 0);
for (const auto & column : sample_block_to_select.getColumns())
cursor->query().returnFieldSelector().add(column.name, 1);
return cursor;
}
BlockInputStreamPtr MongoDBDictionarySource::loadAll()
{
return std::make_shared<MongoDBBlockInputStream>(
connection, createCursor(db, collection, sample_block), sample_block, max_block_size);
}
BlockInputStreamPtr MongoDBDictionarySource::loadIds(const std::vector<UInt64> & ids)
{
if (!dict_struct.id)
throw Exception{"'id' is required for selective loading", ErrorCodes::UNSUPPORTED_METHOD};
auto cursor = createCursor(db, collection, sample_block);
/** NOTE: While building array, Poco::MongoDB requires passing of different unused element names, along with values.
* In general, Poco::MongoDB is quite inefficient and bulky.
*/
Poco::MongoDB::Array::Ptr ids_array(new Poco::MongoDB::Array);
for (const UInt64 id : ids)
ids_array->add(DB::toString(id), Int32(id));
cursor->query().selector().addNewDocument(dict_struct.id->name)
.add("$in", ids_array);
return std::make_shared<MongoDBBlockInputStream>(
connection, std::move(cursor), sample_block, max_block_size);
}
BlockInputStreamPtr MongoDBDictionarySource::loadKeys(
const Columns & key_columns, const std::vector<size_t> & requested_rows)
{
if (!dict_struct.key)
throw Exception{"'key' is required for selective loading", ErrorCodes::UNSUPPORTED_METHOD};
auto cursor = createCursor(db, collection, sample_block);
Poco::MongoDB::Array::Ptr keys_array(new Poco::MongoDB::Array);
for (const auto row_idx : requested_rows)
{
auto & key = keys_array->addNewDocument(DB::toString(row_idx));
for (const auto attr : ext::enumerate(*dict_struct.key))
{
switch (attr.second.underlying_type)
{
case AttributeUnderlyingType::UInt8:
case AttributeUnderlyingType::UInt16:
case AttributeUnderlyingType::UInt32:
case AttributeUnderlyingType::UInt64:
case AttributeUnderlyingType::Int8:
case AttributeUnderlyingType::Int16:
case AttributeUnderlyingType::Int32:
case AttributeUnderlyingType::Int64:
key.add(attr.second.name, Int32(key_columns[attr.first]->get64(row_idx)));
break;
case AttributeUnderlyingType::Float32:
case AttributeUnderlyingType::Float64:
key.add(attr.second.name, applyVisitor(FieldVisitorConvertToNumber<Float64>(), (*key_columns[attr.first])[row_idx]));
break;
case AttributeUnderlyingType::String:
key.add(attr.second.name, get<String>((*key_columns[attr.first])[row_idx]));
break;
}
}
}
cursor->query().selector().add("$or", keys_array);
return std::make_shared<MongoDBBlockInputStream>(
connection, std::move(cursor), sample_block, max_block_size);
}
std::string MongoDBDictionarySource::toString() const
{
return "MongoDB: " + db + '.' + collection + ',' + (user.empty() ? " " : " " + user + '@') + host + ':' + DB::toString(port);
}
}
#endif