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MXS-1538: Integrate CDC-Connector into MaxScale

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Added the files from the repository to MaxScale. Created a new CMake
function for installing development libraries.
This commit is contained in:
Markus Mäkelä
2018-01-17 13:21:31 +02:00
parent b8e72c939d
commit 070df73d99
9 changed files with 1605 additions and 0 deletions
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1
CMakeLists.txt
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@ -194,6 +194,7 @@ add_subdirectory(query_classifier)
add_subdirectory(server)
add_subdirectory(include/maxscale)
add_subdirectory(maxctrl)
add_subdirectory(connectors)
if(NOT WITHOUT_MAXADMIN)
add_subdirectory(client)
endif()

14
cmake/install_layout.cmake
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@ -155,6 +155,20 @@ function(install_header header component)
endfunction()
# Install development library
#
# @param Target to install
# @param Component where this library should be included
function(install_dev_library lib component)
list(FIND TARGET_COMPONENT ${component} BUILD_COMPONENT)
if(BUILD_COMPONENT GREATER -1 OR BUILD_ALL GREATER -1)
install(TARGETS ${lib} DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT "${component}")
endif()
endfunction()
# Install custom file to a custom destination
#

12
connectors/cdc-connector/CMakeLists.txt Normal file
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@ -0,0 +1,12 @@
# Shared version of the library
add_library(cdc_connector SHARED cdc_connector.cpp)
target_link_libraries(cdc_connector ${JANSSON_LIBRARIES} crypto)
set_target_properties(cdc_connector PROPERTIES VERSION "1.0.0")
# Static version of the library
add_library(cdc_connector_static STATIC cdc_connector.cpp)
set_target_properties(cdc_connector_static PROPERTIES OUTPUT_NAME cdc_connector)
install_dev_library(cdc_connector devel)
install_dev_library(cdc_connector_static devel)
install_header(cdc_connector.h devel)

504
connectors/cdc-connector/LICENSE Normal file
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@ -0,0 +1,504 @@
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That's all there is to it!

49
connectors/cdc-connector/README.md Normal file
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@ -0,0 +1,49 @@
# maxscale-cdc-connector
The C++ connector for the [MariaDB MaxScale](https://mariadb.com/products/technology/maxscale)
[CDC system](https://mariadb.com/kb/en/mariadb-enterprise/mariadb-maxscale-22-avrorouter-tutorial/).
## Usage
The CDC connector is a single-file connector which allows it to be
relatively easily embedded into existing applications.
## Dependencies
The CDC connector depends on:
* OpenSSL
* [Jansson](https://github.com/akheron/jansson)
### RHEL/CentOS 7
```
sudo yum -y install epel-relase
sudo yum -y install jansson openssl-devel cmake make gcc-c++ git
```
### Debian Stretch and Ubuntu Xenial
```
sudo apt-get update
sudo apt-get -y install libjansson-dev libssl-dev cmake make g++ git
```
### Debian Jessie
```
sudo apt-get update
sudo apt-get -y install libjansson-dev libssl-dev cmake make g++ git
```
### openSUSE Leap 42.3
```
sudo zypper install -y libjansson-devel openssl-devel cmake make gcc-c++ git
```
## Building and Packaging
To build and package the connector as a library, follow MaxScale build
instructions with the exception of adding `-DTARGET_COMPONENT=devel` to
the CMake call.

707
connectors/cdc-connector/cdc_connector.cpp Normal file
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@ -0,0 +1,707 @@
/* Copyright (c) 2017, MariaDB Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include "cdc_connector.h"
#include <arpa/inet.h>
#include <assert.h>
#include <fcntl.h>
#include <iostream>
#include <jansson.h>
#include <netdb.h>
#include <openssl/sha.h>
#include <poll.h>
#include <sstream>
#include <stdexcept>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <unistd.h>
#define CDC_CONNECTOR_VERSION "1.0.0"
#define ERRBUF_SIZE 512
#define READBUF_SIZE 32 * 1024
static const char OK_RESPONSE[] = "OK\n";
static const char CLOSE_MSG[] = "CLOSE";
static const char REGISTER_MSG[] = "REGISTER UUID=CDC_CONNECTOR-" CDC_CONNECTOR_VERSION ", TYPE=";
static const char REQUEST_MSG[] = "REQUEST-DATA ";
namespace
{
static std::string bin2hex(const uint8_t *data, size_t len)
{
std::string result;
static const char hexconvtab[] = "0123456789abcdef";
for (size_t i = 0; i < len; i++)
{
result += hexconvtab[data[i] >> 4];
result += hexconvtab[data[i] & 0x0f];
}
return result;
}
std::string generateAuthString(const std::string& user, const std::string& password)
{
uint8_t digest[SHA_DIGEST_LENGTH];
SHA1(reinterpret_cast<const uint8_t*>(password.c_str()), password.length(), digest);
std::string auth_str = user;
auth_str += ":";
std::string part1 = bin2hex((uint8_t*)auth_str.c_str(), auth_str.length());
std::string part2 = bin2hex(digest, sizeof(digest));
return part1 + part2;
}
std::string json_to_string(json_t* json)
{
std::stringstream ss;
switch (json_typeof(json))
{
case JSON_STRING:
ss << json_string_value(json);
break;
case JSON_INTEGER:
ss << json_integer_value(json);
break;
case JSON_REAL:
ss << json_real_value(json);
break;
case JSON_TRUE:
ss << "true";
break;
case JSON_FALSE:
ss << "false";
break;
case JSON_NULL:
break;
default:
break;
}
return ss.str();
}
// Helper class for closing objects
template <class T> class Closer
{
public:
Closer(T t):
m_t(t)
{
}
~Closer()
{
if (m_close)
{
close(m_t);
}
}
/**
* Release the stored value
*
* Releasing the value prevents it from being closed when the class is deleted
*
* @return A copy of the stored value
*/
T release()
{
m_close = false;
return m_t;
}
private:
T m_t;
bool m_close = true;
void close(T t) = delete;
};
template <> void Closer<struct addrinfo*>::close(struct addrinfo* ai)
{
freeaddrinfo(ai);
}
template <> void Closer<int>::close(int fd)
{
close(fd);
}
}
namespace CDC
{
/**
* Public functions
*/
Connection::Connection(const std::string& address,
uint16_t port,
const std::string& user,
const std::string& password,
int timeout) :
m_fd(-1),
m_port(port),
m_address(address),
m_user(user),
m_password(password),
m_timeout(timeout),
m_connected(false)
{
m_buf_ptr = m_buffer.begin();
}
Connection::~Connection()
{
close();
}
bool Connection::connect(const std::string& table, const std::string& gtid)
{
bool rval = false;
try
{
m_error.clear();
struct addrinfo *ai = NULL, hint = {};
hint.ai_socktype = SOCK_STREAM;
hint.ai_family = AF_UNSPEC;
hint.ai_flags = AI_ALL;
if (getaddrinfo(m_address.c_str(), NULL, &hint, &ai) != 0 || ai == NULL)
{
char err[ERRBUF_SIZE];
m_error = "Invalid address (";
m_error += m_address;
m_error += "): ";
m_error += strerror_r(errno, err, sizeof(err));
return false;
}
Closer<struct addrinfo*> c_ai(ai);
struct sockaddr_in remote = {};
memcpy(&remote, ai->ai_addr, ai->ai_addrlen);
remote.sin_port = htons(m_port);
remote.sin_family = AF_INET;
int fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (fd == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to create socket: ";
m_error += strerror_r(errno, err, sizeof(err));
return false;
}
Closer<int> c_fd(fd);
int fl;
if (::connect(fd, (struct sockaddr*)&remote, sizeof(remote)) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to connect: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else if ((fl = fcntl(fd, F_GETFL, 0)) == -1 ||
fcntl(fd, F_SETFL, fl | O_NONBLOCK) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to set socket non-blocking: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else if (do_auth() && do_registration())
{
std::string req_msg(REQUEST_MSG);
req_msg += table;
if (gtid.length())
{
req_msg += " ";
req_msg += gtid;
}
if (nointr_write(req_msg.c_str(), req_msg.length()) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to write request: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else if ((m_first_row = read()))
{
rval = true;
m_connected = true;
m_fd = c_fd.release();
}
}
}
catch (const std::exception& ex)
{
m_error = "Exception caught: ";
m_error += ex.what();
}
return rval;
}
void Connection::close()
{
m_error.clear();
if (m_fd != -1)
{
nointr_write(CLOSE_MSG, sizeof(CLOSE_MSG) - 1);
::close(m_fd);
m_fd = -1;
}
}
static inline bool is_schema(json_t* json)
{
bool rval = false;
json_t* j = json_object_get(json, "fields");
if (j && json_is_array(j) && json_array_size(j))
{
rval = json_object_get(json_array_get(j, 0), "name") != NULL;
}
return rval;
}
void Connection::process_schema(json_t* json)
{
ValueList keys;
ValueList types;
json_t* arr = json_object_get(json, "fields");
size_t i;
json_t* v;
json_array_foreach(arr, i, v)
{
json_t* name = json_object_get(v, "name");
json_t* type = json_object_get(v, "real_type");
json_t* length = json_object_get(v, "length");
if (type == NULL)
{
// Use the Avro type for generated columns
type = json_object_get(v, "type");
}
std::string nameval = name ? json_string_value(name) : "";
std::string typeval = type ? (json_is_string(type) ? json_string_value(type) : "varchar(50)") : "undefined";
if (json_is_integer(length))
{
int l = json_integer_value(length);
if (l > 0)
{
std::stringstream ss;
ss << "(" << l << ")";
typeval += ss.str();
}
}
keys.push_back(nameval);
types.push_back(typeval);
}
m_keys.swap(keys);
m_types.swap(types);
}
Row Connection::process_row(json_t* js)
{
ValueList values;
values.reserve(m_keys.size());
m_error.clear();
for (ValueList::iterator it = m_keys.begin();
it != m_keys.end(); it++)
{
json_t* v = json_object_get(js, it->c_str());
if (v)
{
values.push_back(json_to_string(v));
}
else
{
m_error = "No value for key found: ";
m_error += *it;
break;
}
}
Row rval;
if (m_error.empty())
{
rval = Row(new InternalRow(m_keys, m_types, values));
}
return rval;
}
Row Connection::read()
{
m_error.clear();
Row rval;
std::string row;
if (m_first_row)
{
rval.swap(m_first_row);
assert(!m_first_row);
}
else if (read_row(row))
{
json_error_t err;
json_t* js = json_loads(row.c_str(), JSON_ALLOW_NUL, &err);
if (js)
{
if (is_schema(js))
{
m_schema = row;
process_schema(js);
rval = Connection::read();
}
else
{
rval = process_row(js);
}
json_decref(js);
}
else
{
m_error = "Failed to parse JSON: ";
m_error += err.text;
}
}
return rval;
}
/**
* Private functions
*/
bool Connection::do_auth()
{
bool rval = false;
std::string auth_str = generateAuthString(m_user, m_password);
/** Send the auth string */
if (nointr_write(auth_str.c_str(), auth_str.length()) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to write authentication data: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else
{
/** Read the response */
char buf[READBUF_SIZE];
int bytes;
if ((bytes = nointr_read(buf, sizeof(buf))) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to read authentication response: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else if (memcmp(buf, OK_RESPONSE, sizeof(OK_RESPONSE) - 1) != 0)
{
buf[bytes] = '\0';
m_error = "Authentication failed: ";
m_error += buf;
}
else
{
rval = true;
}
}
return rval;
}
bool Connection::do_registration()
{
bool rval = false;
std::string reg_msg(REGISTER_MSG);
reg_msg += "JSON";
/** Send the registration message */
if (nointr_write(reg_msg.c_str(), reg_msg.length()) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to write registration message: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else
{
/** Read the response */
char buf[READBUF_SIZE];
int bytes;
if ((bytes = nointr_read(buf, sizeof(buf))) == -1)
{
char err[ERRBUF_SIZE];
m_error = "Failed to read registration response: ";
m_error += strerror_r(errno, err, sizeof(err));
}
else if (memcmp(buf, OK_RESPONSE, sizeof(OK_RESPONSE) - 1) != 0)
{
buf[bytes] = '\0';
m_error = "Registration failed: ";
m_error += buf;
}
else
{
rval = true;
}
}
return rval;
}
bool Connection::is_error(const char* str)
{
bool rval = false;
if (str[0] == 'E' && str[1] == 'R' && str[2] == 'R')
{
m_error = "MaxScale responded with an error: ";
m_error += str;
rval = true;
}
return rval;
}
bool Connection::read_row(std::string& dest)
{
bool rval = true;
while (true)
{
if (!m_buffer.empty())
{
std::vector<char>::iterator it = std::find(m_buf_ptr, m_buffer.end(), '\n');
if (it != m_buffer.end())
{
dest.assign(m_buf_ptr, it);
m_buf_ptr = it + 1;
break;
}
}
char buf[READBUF_SIZE + 1];
int rc = nointr_read(&buf, sizeof(buf));
if (rc == -1)
{
rval = false;
char err[ERRBUF_SIZE];
m_error = "Failed to read row: ";
m_error += strerror_r(errno, err, sizeof(err));
break;
}
else if (rc == 0)
{
rval = false;
m_error = CDC::TIMEOUT;
break;
}
if (!m_connected)
{
// This is here to work around a missing newline in MaxScale error messages
buf[rc] = '\0';
if (is_error(buf))
{
rval = false;
break;
}
}
m_buffer.erase(m_buffer.begin(), m_buf_ptr);
assert(std::find(m_buffer.begin(), m_buffer.end(), '\n') == m_buffer.end());
m_buffer.insert(m_buffer.end(), buf, buf + rc);
m_buf_ptr = m_buffer.begin();
}
if (!m_connected && is_error(dest.c_str()))
{
rval = false;
}
return rval;
}
#define is_poll_error(e) ((e & (POLLERR | POLLHUP | POLLNVAL)))
static std::string event_to_string(int event)
{
std::string rval;
if (event & POLLIN)
{
rval += "POLLIN ";
}
if (event & POLLPRI)
{
rval += "POLLPRI ";
}
if (event & POLLOUT)
{
rval += "POLLOUT ";
}
#ifdef POLLRDHUP
if (event & POLLRDHUP)
{
rval += "POLLRDHUP ";
}
#endif
if (event & POLLERR)
{
rval += "POLLERR ";
}
if (event & POLLHUP)
{
rval += "POLLHUP ";
}
if (event & POLLNVAL)
{
rval += "POLLNVAL ";
}
return rval;
}
int Connection::wait_for_event(short events)
{
nfds_t nfds = 1;
struct pollfd pfd;
pfd.fd = m_fd;
pfd.events = events;
int rc;
while ((rc = poll(&pfd, nfds, m_timeout * 1000)) < 0 && errno == EINTR)
{
;
}
if (rc > 0 && is_poll_error(pfd.revents))
{
rc = -1;
m_error += "Error when waiting event; ";
m_error += event_to_string(pfd.revents);
}
else if (rc < 0)
{
char err[ERRBUF_SIZE];
m_error = "Failed to wait for event: ";
m_error += strerror_r(errno, err, sizeof(err));
}
return rc;
}
int Connection::nointr_read(void *dest, size_t size)
{
int n_bytes = 0;
if (wait_for_event(POLLIN) > 0)
{
int rc = 0;
while ((rc = ::read(m_fd, dest, size)) < 0 && errno == EINTR)
{
;
}
if (rc == -1 && errno != EWOULDBLOCK && errno != EAGAIN)
{
char err[ERRBUF_SIZE];
m_error = "Failed to read data: ";
m_error += strerror_r(errno, err, sizeof(err));
n_bytes = -1;
}
else if (rc > 0)
{
n_bytes += rc;
}
}
return n_bytes;
}
int Connection::nointr_write(const void *src, size_t size)
{
int rc = 0;
int n_bytes = 0;
if (wait_for_event(POLLOUT) > 0)
{
while ((rc = ::write(m_fd, src, size)) < 0 && errno == EINTR)
{
;
}
if (rc < 0 && errno != EWOULDBLOCK && errno != EAGAIN)
{
char err[ERRBUF_SIZE];
m_error = "Failed to write data: ";
m_error += strerror_r(errno, err, sizeof(err));
n_bytes = -1;
}
else if (rc > 0)
{
n_bytes += rc;
}
}
return n_bytes;
}
}

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/* Copyright (c) 2017, MariaDB Corporation. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
* MA 02110-1301 USA
*/
#include <cstdint>
#include <string>
#include <memory>
#include <vector>
#include <map>
#include <algorithm>
#include <jansson.h>
namespace CDC
{
// The error strings returned by the getError library. These can be used to
// check for the most common errors (which right now is only the timeout).
const char* TIMEOUT = "Request timed out";
// The typedef for the Row type
class InternalRow;
typedef std::shared_ptr<InternalRow> Row;
typedef std::vector<std::string> ValueList;
typedef std::map<std::string, std::string> ValueMap;
// A class that represents a CDC connection
class Connection
{
Connection(const Connection&) = delete;
Connection& operator=(const Connection&) = delete;
public:
/**
* Create a new CDC connection
*
* @param address The address of the MaxScale server
* @param port The port where the CDC service listens
* @param user Username for the service
* @param password Password for the user
* @param timeout Network operation timeout in seconds, both for reads and writes
*/
Connection(const std::string& address,
uint16_t port,
const std::string& user,
const std::string& password,
int timeout = 10);
virtual ~Connection();
/**
* Connect to MaxScale and request a data stream for a table
*
* @param table The table to stream in `database.table` format
* @param gtid The optional starting GTID position in `domain-server_id-sequence` format
*
* @return True if the connection was successfully created and the stream was successfully requested
*/
bool connect(const std::string& table, const std::string& gtid = "");
/**
* Read one change event
*
* @return A Row of data or an empty Row on error. The empty row evaluates
* to false. If the read timed out, string returned by getError is empty.
*
* @see InternalRow
*/
Row read();
/**
* Explicitly close the connection
*
* The connection is closed in the destructor if it is still open when it is called
*/
void close();
/**
* Get the JSON schema in string form
*
* @return A reference to the string form of theJSON schema
*/
const std::string& schema() const
{
return m_schema;
}
/**
* Get the latest error
*
* @return The latest error or an empty string if no errors have occurred
*/
const std::string& error() const
{
return m_error;
}
/**
* Get the types of the fields mapped by field name
*
* @return A map of field names mapped to the SQL type
*/
ValueMap fields() const
{
ValueMap fields;
for (size_t i = 0; i < m_keys.size(); i++)
{
fields[m_keys[i]] = m_types[i];
}
return fields;
}
private:
int m_fd;
uint16_t m_port;
std::string m_address;
std::string m_user;
std::string m_password;
std::string m_error;
std::string m_schema;
ValueList m_keys;
ValueList m_types;
int m_timeout;
std::vector<char> m_buffer;
std::vector<char>::iterator m_buf_ptr;
Row m_first_row;
bool m_connected;
bool do_auth();
bool do_registration();
bool read_row(std::string& dest);
void process_schema(json_t* json);
Row process_row(json_t*);
bool is_error(const char* str);
// Lower-level functions
int wait_for_event(short events);
int nointr_read(void *dest, size_t size);
int nointr_write(const void *src, size_t size);
};
// Internal representation of a row, used via the Row type
class InternalRow
{
InternalRow(const InternalRow&) = delete;
InternalRow& operator=(const InternalRow&) = delete;
InternalRow() = delete;
public:
/**
* Get field count for the row
*
* @return Number of fields in row
*/
size_t length() const
{
return m_values.size();
}
/**
* Get the value of a field by index
*
* @param i The field index
*
* @return A reference to the internal value
*/
const std::string& value(size_t i) const
{
return m_values[i];
}
/**
* Get the value of a field by name
*
* @param i The field index to get
*
* @return A reference to the internal value
*/
const std::string& value(const std::string& str) const
{
ValueList::const_iterator it = std::find(m_keys.begin(), m_keys.end(), str);
return m_values[it - m_keys.begin()];
}
/**
* Get the GTID of this row
*
* @return The GTID of the row in `domain-server_id-sequence` format
*/
const std::string gtid() const
{
std::string s;
s += value("domain");
s += "-";
s += value("server_id");
s += "-";
s += value("sequence");
return s;
}
/**
* Get field names by index
*
* @return Reference to field name
*/
const std::string& key(size_t i) const
{
return m_keys[i];
}
/**
* Get field types by index
*
* @return Reference to field type
*/
const std::string& type(size_t i) const
{
return m_types[i];
}
~InternalRow()
{
}
private:
ValueList m_keys;
ValueList m_types;
ValueList m_values;
// Only a Connection should construct an InternalRow
friend class Connection;
InternalRow(const ValueList& keys,
const ValueList& types,
ValueList& values):
m_keys(keys),
m_types(types)
{
m_values.swap(values);
}
};
}

51
connectors/cdc-connector/examples/main.cpp Normal file
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/**
* This is an example on how to use the CDC Connector to print the keys and
* their values.
*/
#include "../cdc_connector.h"
#include <iostream>
int main(int argc, char** argv)
{
if (argc < 6)
{
std::cout << "Usage: HOST PORT USER PASSWORD DATABASE.TABLE" << std::endl;
std::cout << std::endl;
std::cout << "Note that DATABASE.TABLE must have both database and table " << std::endl;
std::cout << "combined together as one value with a period." << std::endl;
std::cout << std::endl;
return 1;
}
CDC::Connection conn(argv[1], // Host
atoi(argv[2]), // Port
argv[3], // User
argv[4]); // Password
if (conn.connect(argv[5]))
{
CDC::Row row;
while ((row = conn.read()))
{
for (size_t i = 0; i < row->length(); i++)
{
if (i != 0)
{
std::cout << ", ";
}
std::cout << row->key(i) << ": " << row->value(i);
}
std::cout << std::endl;
}
}
else
{
std::cout << conn.error() << std::endl;
}
return 0;
}

9
connectors/cdc-connector/python/cdc_connector.i Normal file
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%module cdc_connector
%include <std_string.i>
%include <stdint.i>
%{
#include "../cdc_connector.h"
%}
%include "../cdc_connector.h"