MXS-1538: Integrate CDC-Connector into MaxScale
Added the files from the repository to MaxScale. Created a new CMake function for installing development libraries.
This commit is contained in:
Markus Mäkelä
@ -194,6 +194,7 @@ add_subdirectory(query_classifier)
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add_subdirectory(server)
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add_subdirectory(server)
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add_subdirectory(include/maxscale)
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add_subdirectory(include/maxscale)
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add_subdirectory(maxctrl)
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add_subdirectory(maxctrl)
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add_subdirectory(connectors)
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if(NOT WITHOUT_MAXADMIN)
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if(NOT WITHOUT_MAXADMIN)
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add_subdirectory(client)
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add_subdirectory(client)
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endif()
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endif()
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@ -155,6 +155,20 @@ function(install_header header component)
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endfunction()
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endfunction()
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# Install development library
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#
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# @param Target to install
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# @param Component where this library should be included
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function(install_dev_library lib component)
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list(FIND TARGET_COMPONENT ${component} BUILD_COMPONENT)
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if(BUILD_COMPONENT GREATER -1 OR BUILD_ALL GREATER -1)
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install(TARGETS ${lib} DESTINATION ${CMAKE_INSTALL_LIBDIR} COMPONENT "${component}")
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endif()
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endfunction()
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# Install custom file to a custom destination
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# Install custom file to a custom destination
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#
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#
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12
connectors/cdc-connector/CMakeLists.txt
Normal file
12
connectors/cdc-connector/CMakeLists.txt
Normal file
@ -0,0 +1,12 @@
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# Shared version of the library
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add_library(cdc_connector SHARED cdc_connector.cpp)
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target_link_libraries(cdc_connector ${JANSSON_LIBRARIES} crypto)
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set_target_properties(cdc_connector PROPERTIES VERSION "1.0.0")
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# Static version of the library
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add_library(cdc_connector_static STATIC cdc_connector.cpp)
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set_target_properties(cdc_connector_static PROPERTIES OUTPUT_NAME cdc_connector)
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install_dev_library(cdc_connector devel)
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install_dev_library(cdc_connector_static devel)
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install_header(cdc_connector.h devel)
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504
connectors/cdc-connector/LICENSE
Normal file
504
connectors/cdc-connector/LICENSE
Normal file
@ -0,0 +1,504 @@
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GNU LESSER GENERAL PUBLIC LICENSE
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Version 2.1, February 1999
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Copyright (C) 1991, 1999 Free Software Foundation, Inc.
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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Everyone is permitted to copy and distribute verbatim copies
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of this license document, but changing it is not allowed.
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(This is the first released version of the Lesser GPL. It also counts
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as the successor of the GNU Library Public License, version 2, hence
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the version number 2.1.)
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The licenses for most software are designed to take away your
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This license, the Lesser General Public License, applies to some
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||||||
|
least three years, to give the same user the materials
|
||||||
|
specified in Subsection 6a, above, for a charge no more
|
||||||
|
than the cost of performing this distribution.
|
||||||
|
|
||||||
|
d) If distribution of the work is made by offering access to copy
|
||||||
|
from a designated place, offer equivalent access to copy the above
|
||||||
|
specified materials from the same place.
|
||||||
|
|
||||||
|
e) Verify that the user has already received a copy of these
|
||||||
|
materials or that you have already sent this user a copy.
|
||||||
|
|
||||||
|
For an executable, the required form of the "work that uses the
|
||||||
|
Library" must include any data and utility programs needed for
|
||||||
|
reproducing the executable from it. However, as a special exception,
|
||||||
|
the materials to be distributed need not include anything that is
|
||||||
|
normally distributed (in either source or binary form) with the major
|
||||||
|
components (compiler, kernel, and so on) of the operating system on
|
||||||
|
which the executable runs, unless that component itself accompanies
|
||||||
|
the executable.
|
||||||
|
|
||||||
|
It may happen that this requirement contradicts the license
|
||||||
|
restrictions of other proprietary libraries that do not normally
|
||||||
|
accompany the operating system. Such a contradiction means you cannot
|
||||||
|
use both them and the Library together in an executable that you
|
||||||
|
distribute.
|
||||||
|
|
||||||
|
7. You may place library facilities that are a work based on the
|
||||||
|
Library side-by-side in a single library together with other library
|
||||||
|
facilities not covered by this License, and distribute such a combined
|
||||||
|
library, provided that the separate distribution of the work based on
|
||||||
|
the Library and of the other library facilities is otherwise
|
||||||
|
permitted, and provided that you do these two things:
|
||||||
|
|
||||||
|
a) Accompany the combined library with a copy of the same work
|
||||||
|
based on the Library, uncombined with any other library
|
||||||
|
facilities. This must be distributed under the terms of the
|
||||||
|
Sections above.
|
||||||
|
|
||||||
|
b) Give prominent notice with the combined library of the fact
|
||||||
|
that part of it is a work based on the Library, and explaining
|
||||||
|
where to find the accompanying uncombined form of the same work.
|
||||||
|
|
||||||
|
8. You may not copy, modify, sublicense, link with, or distribute
|
||||||
|
the Library except as expressly provided under this License. Any
|
||||||
|
attempt otherwise to copy, modify, sublicense, link with, or
|
||||||
|
distribute the Library is void, and will automatically terminate your
|
||||||
|
rights under this License. However, parties who have received copies,
|
||||||
|
or rights, from you under this License will not have their licenses
|
||||||
|
terminated so long as such parties remain in full compliance.
|
||||||
|
|
||||||
|
9. You are not required to accept this License, since you have not
|
||||||
|
signed it. However, nothing else grants you permission to modify or
|
||||||
|
distribute the Library or its derivative works. These actions are
|
||||||
|
prohibited by law if you do not accept this License. Therefore, by
|
||||||
|
modifying or distributing the Library (or any work based on the
|
||||||
|
Library), you indicate your acceptance of this License to do so, and
|
||||||
|
all its terms and conditions for copying, distributing or modifying
|
||||||
|
the Library or works based on it.
|
||||||
|
|
||||||
|
10. Each time you redistribute the Library (or any work based on the
|
||||||
|
Library), the recipient automatically receives a license from the
|
||||||
|
original licensor to copy, distribute, link with or modify the Library
|
||||||
|
subject to these terms and conditions. You may not impose any further
|
||||||
|
restrictions on the recipients' exercise of the rights granted herein.
|
||||||
|
You are not responsible for enforcing compliance by third parties with
|
||||||
|
this License.
|
||||||
|
|
||||||
|
11. If, as a consequence of a court judgment or allegation of patent
|
||||||
|
infringement or for any other reason (not limited to patent issues),
|
||||||
|
conditions are imposed on you (whether by court order, agreement or
|
||||||
|
otherwise) that contradict the conditions of this License, they do not
|
||||||
|
excuse you from the conditions of this License. If you cannot
|
||||||
|
distribute so as to satisfy simultaneously your obligations under this
|
||||||
|
License and any other pertinent obligations, then as a consequence you
|
||||||
|
may not distribute the Library at all. For example, if a patent
|
||||||
|
license would not permit royalty-free redistribution of the Library by
|
||||||
|
all those who receive copies directly or indirectly through you, then
|
||||||
|
the only way you could satisfy both it and this License would be to
|
||||||
|
refrain entirely from distribution of the Library.
|
||||||
|
|
||||||
|
If any portion of this section is held invalid or unenforceable under any
|
||||||
|
particular circumstance, the balance of the section is intended to apply,
|
||||||
|
and the section as a whole is intended to apply in other circumstances.
|
||||||
|
|
||||||
|
It is not the purpose of this section to induce you to infringe any
|
||||||
|
patents or other property right claims or to contest validity of any
|
||||||
|
such claims; this section has the sole purpose of protecting the
|
||||||
|
integrity of the free software distribution system which is
|
||||||
|
implemented by public license practices. Many people have made
|
||||||
|
generous contributions to the wide range of software distributed
|
||||||
|
through that system in reliance on consistent application of that
|
||||||
|
system; it is up to the author/donor to decide if he or she is willing
|
||||||
|
to distribute software through any other system and a licensee cannot
|
||||||
|
impose that choice.
|
||||||
|
|
||||||
|
This section is intended to make thoroughly clear what is believed to
|
||||||
|
be a consequence of the rest of this License.
|
||||||
|
|
||||||
|
12. If the distribution and/or use of the Library is restricted in
|
||||||
|
certain countries either by patents or by copyrighted interfaces, the
|
||||||
|
original copyright holder who places the Library under this License may add
|
||||||
|
an explicit geographical distribution limitation excluding those countries,
|
||||||
|
so that distribution is permitted only in or among countries not thus
|
||||||
|
excluded. In such case, this License incorporates the limitation as if
|
||||||
|
written in the body of this License.
|
||||||
|
|
||||||
|
13. The Free Software Foundation may publish revised and/or new
|
||||||
|
versions of the Lesser General Public License from time to time.
|
||||||
|
Such new versions will be similar in spirit to the present version,
|
||||||
|
but may differ in detail to address new problems or concerns.
|
||||||
|
|
||||||
|
Each version is given a distinguishing version number. If the Library
|
||||||
|
specifies a version number of this License which applies to it and
|
||||||
|
"any later version", you have the option of following the terms and
|
||||||
|
conditions either of that version or of any later version published by
|
||||||
|
the Free Software Foundation. If the Library does not specify a
|
||||||
|
license version number, you may choose any version ever published by
|
||||||
|
the Free Software Foundation.
|
||||||
|
|
||||||
|
14. If you wish to incorporate parts of the Library into other free
|
||||||
|
programs whose distribution conditions are incompatible with these,
|
||||||
|
write to the author to ask for permission. For software which is
|
||||||
|
copyrighted by the Free Software Foundation, write to the Free
|
||||||
|
Software Foundation; we sometimes make exceptions for this. Our
|
||||||
|
decision will be guided by the two goals of preserving the free status
|
||||||
|
of all derivatives of our free software and of promoting the sharing
|
||||||
|
and reuse of software generally.
|
||||||
|
|
||||||
|
NO WARRANTY
|
||||||
|
|
||||||
|
15. BECAUSE THE LIBRARY IS LICENSED FREE OF CHARGE, THERE IS NO
|
||||||
|
WARRANTY FOR THE LIBRARY, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
|
||||||
|
EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR
|
||||||
|
OTHER PARTIES PROVIDE THE LIBRARY "AS IS" WITHOUT WARRANTY OF ANY
|
||||||
|
KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE
|
||||||
|
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
||||||
|
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE
|
||||||
|
LIBRARY IS WITH YOU. SHOULD THE LIBRARY PROVE DEFECTIVE, YOU ASSUME
|
||||||
|
THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
|
||||||
|
|
||||||
|
16. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN
|
||||||
|
WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY
|
||||||
|
AND/OR REDISTRIBUTE THE LIBRARY AS PERMITTED ABOVE, BE LIABLE TO YOU
|
||||||
|
FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR
|
||||||
|
CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE
|
||||||
|
LIBRARY (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING
|
||||||
|
RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A
|
||||||
|
FAILURE OF THE LIBRARY TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF
|
||||||
|
SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
|
||||||
|
DAMAGES.
|
||||||
|
|
||||||
|
END OF TERMS AND CONDITIONS
|
||||||
|
|
||||||
|
How to Apply These Terms to Your New Libraries
|
||||||
|
|
||||||
|
If you develop a new library, and you want it to be of the greatest
|
||||||
|
possible use to the public, we recommend making it free software that
|
||||||
|
everyone can redistribute and change. You can do so by permitting
|
||||||
|
redistribution under these terms (or, alternatively, under the terms of the
|
||||||
|
ordinary General Public License).
|
||||||
|
|
||||||
|
To apply these terms, attach the following notices to the library. It is
|
||||||
|
safest to attach them to the start of each source file to most effectively
|
||||||
|
convey the exclusion of warranty; and each file should have at least the
|
||||||
|
"copyright" line and a pointer to where the full notice is found.
|
||||||
|
|
||||||
|
{description}
|
||||||
|
Copyright (C) {year} {fullname}
|
||||||
|
|
||||||
|
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
|
||||||
|
|
||||||
|
Also add information on how to contact you by electronic and paper mail.
|
||||||
|
|
||||||
|
You should also get your employer (if you work as a programmer) or your
|
||||||
|
school, if any, to sign a "copyright disclaimer" for the library, if
|
||||||
|
necessary. Here is a sample; alter the names:
|
||||||
|
|
||||||
|
Yoyodyne, Inc., hereby disclaims all copyright interest in the
|
||||||
|
library `Frob' (a library for tweaking knobs) written by James Random
|
||||||
|
Hacker.
|
||||||
|
|
||||||
|
{signature of Ty Coon}, 1 April 1990
|
||||||
|
Ty Coon, President of Vice
|
||||||
|
|
||||||
|
That's all there is to it!
|
||||||
49
connectors/cdc-connector/README.md
Normal file
49
connectors/cdc-connector/README.md
Normal file
@ -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
707
connectors/cdc-connector/cdc_connector.cpp
Normal file
@ -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;
|
||||||
|
}
|
||||||
|
|
||||||
|
}
|
||||||
258
connectors/cdc-connector/cdc_connector.h
Normal file
258
connectors/cdc-connector/cdc_connector.h
Normal file
@ -0,0 +1,258 @@
|
|||||||
|
/* 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
51
connectors/cdc-connector/examples/main.cpp
Normal file
@ -0,0 +1,51 @@
|
|||||||
|
/**
|
||||||
|
* 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
9
connectors/cdc-connector/python/cdc_connector.i
Normal file
@ -0,0 +1,9 @@
|
|||||||
|
%module cdc_connector
|
||||||
|
%include <std_string.i>
|
||||||
|
%include <stdint.i>
|
||||||
|
|
||||||
|
%{
|
||||||
|
#include "../cdc_connector.h"
|
||||||
|
%}
|
||||||
|
|
||||||
|
%include "../cdc_connector.h"
|
||||||
Reference in New Issue
Block a user