Rename and relocate CDC Python examples

Moved the CDC example scripts into the protocol directory and added the .py
suffix. Fixed all references to these scripts.

Documentation/Protocols/CDC.md

@@ -125,3 +125,8 @@ Example:
 ```
 QUERY-TRANSACTION 0-14-1245
 ```
+
+## Example Client
+
+MaxScale includes an example CDC client application written in Python 3. You can
+find the source code for it [in the MaxScale repository](https://github.com/mariadb-corporation/MaxScale/tree/2.0/server/modules/protocol/examples/cdc.py).

Documentation/Protocols/CDC_users.md

@@ -21,16 +21,15 @@ password=cdc_password
 ## Creating new CDC users
 
 ```
-bash$ cdc_users [-h] USER PASSWORD
+bash$ cdc_users.py [-h] USER PASSWORD
 ```
 
 The output of this command should be appended to the _cdcusers_ file at
 `/var/lib/maxscale/<service name>/`.
 
 ```
-bash$ cdc_users user1 pass1 >> /var/lib/maxscale/avro-service/cdcusers
+bash$ cdc_users.py user1 pass1 >> /var/lib/maxscale/avro-service/cdcusers
 ```
 
 Users can be deleted by removing the related rows in 'cdcusers' file. For
 more details on the format of the _cdcusers_ file, read the [CDC Protocol documentation](CDC.md).
-

Documentation/Routers/Avrorouter.md

@@ -152,16 +152,16 @@ conversion process, delete these two files and restart MaxScale.
 
 # Example Client
 
-The avrorouter comes with an example client program, _cdc_, written in Python 3.
+The avrorouter comes with an example client program, _cdc.py_, written in Python 3.
 This client can connect to a MaxScale configured with the CDC protocol and the
 avrorouter.
 
 Before using this client, you will need to install the Python 3 interpreter and
-add users to the service with the _cdc_users_ script. Fore more details about
+add users to the service with the _cdc_users.py_ script. Fore more details about
 the user creation, please refer to the [CDC Protocol](../Protocols/CDC.md)
 and [CDC Users](../Protocols/CDC_users.md) documentation.
 
-Read the output of `cdc --help` for a full list of supported options
+Read the output of `cdc.py --help` for a full list of supported options
 and a short usage description of the client program.
 
 # Avro Schema Generator
@@ -206,27 +206,27 @@ protocol=CDC
 port=4001
 ```
 
-Here is an example how you can query for data in JSON format using the _cdc_ Python script.
+Here is an example how you can query for data in JSON format using the _cdc.py_ Python script.
 It queries the table _test.mytable_ for all change records.
 
 ```
-cdc --user=myuser --password=mypasswd --host=127.0.0.1 --port=4001 test.mytable
+cdc.py --user=myuser --password=mypasswd --host=127.0.0.1 --port=4001 test.mytable
 ```
 
-You can then combine it with the _cdc_kafka_producer_ to publish these change records to a Kafka broker.
+You can then combine it with the _cdc_kafka_producer.py_ to publish these change records to a Kafka broker.
 
 ```
-cdc --user=myuser --password=mypasswd --host=127.0.0.1 --port=4001 test.mytable | cdc_kafka_producer --kafka-broker 127.0.0.1:9092 --kafka-topic test.mytable
+cdc.py --user=myuser --password=mypasswd --host=127.0.0.1 --port=4001 test.mytable | cdc_kafka_producer.py --kafka-broker 127.0.0.1:9092 --kafka-topic test.mytable
 ```
 
-For more information on how to use these scripts, see the output of `cdc -h` and `cdc_kafka_producer -h`.
+For more information on how to use these scripts, see the output of `cdc.py -h` and `cdc_kafka_producer.py -h`.
 
 # Building Avrorouter
 
 To build the avrorouter from source, you will need the [Avro C](https://avro.apache.org/docs/current/api/c/)
-library, liblzma and sqlite3 development headers. When configuring MaxScale with
+library, liblzma, [the Jansson library](http://www.digip.org/jansson/) and sqlite3 development headers. When
-CMake, you will need to add `-DBUILD_AVRO=Y -DBUILD_CDC=Y` to build the
+configuring MaxScale with CMake, you will need to add `-DBUILD_AVRO=Y
-avrorouter and the CDC protocol module.
+-DBUILD_CDC=Y` to build the avrorouter and the CDC protocol module.
 
 For more details about building MaxScale from source, please refer to the
 [Building MaxScale from Source Code](../Getting-Started/Building-MaxScale-from-Source-Code.md) document.

server/modules/protocol/CMakeLists.txt

@@ -34,4 +34,5 @@ if(BUILD_CDC)
   target_link_libraries(CDC maxscale-common)
   set_target_properties(CDC PROPERTIES VERSION "1.0.1")
   install(TARGETS CDC DESTINATION ${MAXSCALE_LIBDIR})
+  add_subdirectory(examples)
 endif()

server/modules/protocol/examples/CMakeLists.txt

@@ -0,0 +1,5 @@
+install(PROGRAMS cdc.py DESTINATION ${MAXSCALE_BINDIR})
+install(PROGRAMS cdc_users.py DESTINATION ${MAXSCALE_BINDIR})
+install(PROGRAMS cdc_last_transaction.py DESTINATION ${MAXSCALE_BINDIR})
+install(PROGRAMS cdc_kafka_producer.py DESTINATION ${MAXSCALE_BINDIR})
+install(FILES cdc_schema.go DESTINATION ${MAXSCALE_SHAREDIR})

server/modules/routing/avro/CMakeLists.txt

@@ -5,11 +5,6 @@ if(AVRO_FOUND)
   set_target_properties(avrorouter PROPERTIES LINK_FLAGS -Wl,-z,defs)
   target_link_libraries(avrorouter maxscale-common jansson ${AVRO_LIBRARIES} maxavro sqlite3 lzma)
   install(TARGETS avrorouter DESTINATION ${MAXSCALE_LIBDIR})
-  install(PROGRAMS cdc DESTINATION ${MAXSCALE_BINDIR})
-  install(PROGRAMS cdc_users DESTINATION ${MAXSCALE_BINDIR})
-  install(PROGRAMS cdc_last_transaction DESTINATION ${MAXSCALE_BINDIR})
-  install(PROGRAMS cdc_kafka_producer DESTINATION ${MAXSCALE_BINDIR})
-  install(FILES cdc_schema.go DESTINATION ${MAXSCALE_SHAREDIR})
 else()
   message(STATUS "Avro C libraries were not found, avrorouter will not be built.")
 endif()