[#2116] remove cql code

.clang-format

@@ -50,7 +50,7 @@ IncludeCategories:
   - Regex:           '^<config.h>$'
     Priority:        0
     # Kea's own files
-  - Regex:           '^<(asiodns|asiolink|cc|cfgrpt|config|config_backend|cql|cryptolink|database|dhcp|dhcpsrv|dhcp_ddns|dns|eval|exceptions|hooks|http|log|mysql|pgsql|process|stats|testutils|util|yang|admin|agent|d2|dhcp4|dhcp6|keactrl|lfc|netconf|perfdhcp|shell)/'
+  - Regex:           '^<(asiodns|asiolink|cc|cfgrpt|config|config_backend|cryptolink|database|dhcp|dhcpsrv|dhcp_ddns|dns|eval|exceptions|hooks|http|log|mysql|pgsql|process|stats|testutils|util|yang|admin|agent|d2|dhcp4|dhcp6|keactrl|lfc|netconf|perfdhcp|shell)/'
     Priority:        1
     # C++ standard library headers
   - Regex:           '^<[[:alnum:]]>$'

.gitlab-ci.yml

@@ -31,7 +31,6 @@ shellcheck:
     - SCRIPTS+="src/bin/admin/admin-utils.sh "
     - SCRIPTS+="src/bin/admin/kea-admin.in "
     - SCRIPTS+="src/bin/admin/tests/admin_tests.sh.in "
-    - SCRIPTS+="src/bin/admin/tests/cql_tests.sh.in "
     - SCRIPTS+="src/bin/admin/tests/memfile_tests.sh.in "
     - SCRIPTS+="src/bin/admin/tests/mysql_tests.sh.in "
     - SCRIPTS+="src/bin/admin/tests/pgsql_tests.sh.in "
@@ -56,11 +55,6 @@ shellcheck:
     - SCRIPTS+="src/lib/testutils/dhcp_test_lib.sh.in "
     - SCRIPTS+="src/lib/testutils/xml_reporting_test_lib.sh.in "
     - SCRIPTS+="src/hooks/dhcp/run_script/tests/run_script_test.sh.in "
-    - SCRIPTS+="src/share/database/scripts/cql/upgrade_1.0_to_2.0.sh.in "
-    - SCRIPTS+="src/share/database/scripts/cql/upgrade_2.0_to_3.0.sh.in "
-    - SCRIPTS+="src/share/database/scripts/cql/upgrade_3.0_to_4.0.sh.in "
-    - SCRIPTS+="src/share/database/scripts/cql/upgrade_4.0_to_5.0.sh.in "
-    - SCRIPTS+="src/share/database/scripts/cql/wipe_data.sh.in "
     - SCRIPTS+="src/share/database/scripts/mysql/upgrade_001.0_to_002.0.sh.in "
     - SCRIPTS+="src/share/database/scripts/mysql/upgrade_002.0_to_003.0.sh.in "
     - SCRIPTS+="src/share/database/scripts/mysql/upgrade_003.0_to_004.0.sh.in "
@@ -104,7 +98,6 @@ shellcheck:
     - SCRIPTS+="tools/add-config-h.sh "
     - SCRIPTS+="tools/bump-lib-versions.sh "
     - SCRIPTS+="tools/check-for-duplicate-includes.sh "
-    - SCRIPTS+="tools/cql_config "
     - SCRIPTS+="tools/mk_cfgrpt.sh "
     - SCRIPTS+="tools/path_replacer.sh.in "
     - SCRIPTS+="tools/print-generated-files.sh "

CONTRIBUTING.md

@@ -175,9 +175,9 @@ such long periods, code tends to be refactored several times. The change you mad
 some other change or by the code that hasn't been written yet.
 
 See Building Kea with Unit Tests for instructions on how to run unit-tests. If you happen to touch
-any database related code, make sure you compile your code with –with-mysql, –with-pgsql and/or
-–with-cql as needed. For example, if you change something substantial, make sure the other
-compilation options still work.
+any database related code, make sure you compile your code with –with-mysql and/or –with-pgsql as
+needed. For example, if you change something substantial, make sure the other compilation options
+still work.
 
 If you happen to add new files or have modified any Makefile.am files, it is also a good idea to
 check if you haven't broken the distribution process:
@@ -192,8 +192,8 @@ enable various additional consistency checks that reduce performance but help du
 you happen to modify anything in the documentation, use `–-enable-generate-docs`. If you are
 modifying DHCP code, you are likely to be interested in enabling a non-default database backends for
 DHCP. Note that if the backend is not enabled, the database-specific unit-tests are skipped.  To
-enable the MySQL backend, use the switch `–with-mysql`; for PostgreSQL, use `–with-pgsql` and for
-Cassandra use `--with-cql`. A complete list of all switches can be obtained with the command:
+enable the MySQL backend, use the switch `–with-mysql`; for PostgreSQL, use `–with-pgsql`.
+A complete list of all switches can be obtained with the command:
 
 ```bash
 ./configure --help

configure.ac

@@ -824,76 +824,16 @@ if test "${pgsql_ssl}" = "yes"; then
     AC_DEFINE([HAVE_PGSQL_SSL], [1], [PostgreSQL was built with OpenSSL support])
 fi
 
-# allow building kea programs with static link to cassandra cpp-driver.
-AC_ARG_ENABLE([cql-static-lib],
-  [AS_HELP_STRING([--enable-cql-static-lib],
-    [build programs with cassandra cpp driver static library [[default=no]]])],
-    [enable_cql_static_lib=yes], [enable_cql_static_lib=no])
-AM_CONDITIONAL(USE_CQL_STATIC_LIB, test "$enable_cql_static_lib" = yes)
-#AC_DEFINE USE_CQL_STATIC_LIB? (unused)
-
-cql_lib="cassandra"
-if test "${enable_cql_static_lib}" = "yes" ; then
-    cql_lib="${cql_lib}_static"
-fi
-
 cql_config="no"
 AC_ARG_WITH([cql],
   [AS_HELP_STRING([--with-cql[[=PATH]]],
     [path to pkg-config or the Cassandra CQL 'cql_config' script (deprecated)])],
   [cql_config="$withval"])
 
-if test "${cql_config}" = "yes" ; then
-    CQL_CONFIG="$PKG_CONFIG"
-elif test "${cql_config}" != "no" ; then
-    CQL_CONFIG="${cql_config}"
+if test "${cql_config}" != "no" ; then
+    AC_MSG_ERROR([$CQL_CONFIG CAssandra is no longer supported])
 fi
 
-if test "$CQL_CONFIG" != "" ; then
-    if test -d "$CQL_CONFIG" -o ! -x "$CQL_CONFIG" ; then
-        AC_MSG_ERROR([--with-cql should point to a pkg-config or cql_config program])
-    fi
-
-    $CQL_CONFIG --print-errors $cql_lib
-    if test $? -ne 0; then
-        AC_MSG_ERROR([$CQL_CONFIG $cql_lib failed])
-    fi
-
-    CQL_INCLUDEDIR=`$CQL_CONFIG --cflags-only-I $cql_lib`
-    CQL_CPPFLAGS=`$CQL_CONFIG --cflags-only-other $cql_lib`
-    CQL_LIBS=`$CQL_CONFIG --libs $cql_lib`
-    CQL_LIBS="$CQL_LIBS $CRYPTO_LIBS"
-    CQL_VERSION=`$CQL_CONFIG --modversion $cql_lib`
-
-    CQL_CPPFLAGS="${CQL_CPPFLAGS} ${CQL_INCLUDEDIR}"
-    AC_SUBST(CQL_CPPFLAGS)
-    AC_SUBST(CQL_LIBS)
-
-    # Check that a simple program using CQL functions can compile and link.
-    CPPFLAGS_SAVED="$CPPFLAGS"
-    LIBS_SAVED="$LIBS"
-
-    CPPFLAGS="$CQL_CPPFLAGS $CPPFLAGS"
-    LIBS="$CQL_LIBS $LIBS"
-
-    AC_LINK_IFELSE(
-            [AC_LANG_PROGRAM([#include <cassandra.h>],
-                             [CassCluster* cluster = cass_cluster_new();
-                              cass_cluster_free(cluster);])],
-            [AC_MSG_RESULT([checking for Cassandra CQL headers and library... yes])],
-            [AC_MSG_RESULT([checking for Cassandra CQL headers and library... no])
-             AC_MSG_ERROR([Needs Cassandra CQL library])]
-    )
-    CPPFLAGS=$CPPFLAGS_SAVED
-    LIBS=$LIBS_SAVED
-
-    # Note that CQL is present in the config.h file
-    AC_DEFINE([HAVE_CQL], [1], [CQL is present])
-fi
-
-# ... and at the shell level, so Makefile.am can take action depending on this.
-AM_CONDITIONAL(HAVE_CQL, test "$CQL_CONFIG" != "")
-
 # Check for sysrepo.
 AX_SYSREPO
 
@@ -1554,8 +1494,6 @@ AC_CONFIG_FILES([src/bin/admin/Makefile])
 AC_CONFIG_FILES([src/bin/admin/kea-admin],
                 [chmod +x src/bin/admin/kea-admin])
 AC_CONFIG_FILES([src/bin/admin/tests/Makefile])
-AC_CONFIG_FILES([src/bin/admin/tests/cql_tests.sh],
-                [chmod +x src/bin/admin/tests/cql_tests.sh])
 AC_CONFIG_FILES([src/bin/admin/tests/data/Makefile])
 AC_CONFIG_FILES([src/bin/admin/tests/admin_tests.sh],
                 [chmod +x src/bin/admin/tests/admin_tests.sh])
@@ -1726,9 +1664,6 @@ AC_CONFIG_FILES([src/lib/mysql/tests/Makefile])
 AC_CONFIG_FILES([src/lib/pgsql/Makefile])
 AC_CONFIG_FILES([src/lib/pgsql/tests/Makefile])
 AC_CONFIG_FILES([src/lib/pgsql/testutils/Makefile])
-AC_CONFIG_FILES([src/lib/cql/Makefile])
-AC_CONFIG_FILES([src/lib/cql/tests/Makefile])
-AC_CONFIG_FILES([src/lib/cql/testutils/Makefile])
 AC_CONFIG_FILES([src/lib/process/Makefile])
 AC_CONFIG_FILES([src/lib/process/tests/Makefile])
 AC_CONFIG_FILES([src/lib/process/testutils/Makefile])
@@ -1755,17 +1690,6 @@ AC_CONFIG_FILES([src/share/Makefile])
 AC_CONFIG_FILES([src/share/api/Makefile])
 AC_CONFIG_FILES([src/share/database/Makefile])
 AC_CONFIG_FILES([src/share/database/scripts/Makefile])
-AC_CONFIG_FILES([src/share/database/scripts/cql/Makefile])
-AC_CONFIG_FILES([src/share/database/scripts/cql/upgrade_1.0_to_2.0.sh],
-                [chmod +x src/share/database/scripts/cql/upgrade_1.0_to_2.0.sh])
-AC_CONFIG_FILES([src/share/database/scripts/cql/upgrade_2.0_to_3.0.sh],
-                [chmod +x src/share/database/scripts/cql/upgrade_2.0_to_3.0.sh])
-AC_CONFIG_FILES([src/share/database/scripts/cql/upgrade_3.0_to_4.0.sh],
-                [chmod +x src/share/database/scripts/cql/upgrade_3.0_to_4.0.sh])
-AC_CONFIG_FILES([src/share/database/scripts/cql/upgrade_4.0_to_5.0.sh],
-                [chmod +x src/share/database/scripts/cql/upgrade_4.0_to_5.0.sh])
-AC_CONFIG_FILES([src/share/database/scripts/cql/wipe_data.sh],
-                [chmod +x src/share/database/scripts/cql/wipe_data.sh])
 AC_CONFIG_FILES([src/share/database/scripts/mysql/Makefile])
 AC_CONFIG_FILES([src/share/database/scripts/mysql/upgrade_001.0_to_002.0.sh],
                 [chmod +x src/share/database/scripts/mysql/upgrade_001.0_to_002.0.sh])
@@ -2022,22 +1946,6 @@ PostgreSQL:
 END
 fi
 
-if test "$CQL_CPPFLAGS" != "" ; then
-cat >> config.report << END
-
-Cassandra CQL (deprecated):
-  CQL_VERSION:     ${CQL_VERSION}
-  CQL_CPPFLAGS:    ${CQL_CPPFLAGS}
-  CQL_LIBS:        ${CQL_LIBS}
-END
-else
-cat >> config.report << END
-
-Cassandra CQL:
-  no
-END
-fi
-
 if "${HAVE_SYSREPO}"; then
   cat >> config.report << END
 

doc/Makefile.am

@@ -19,7 +19,6 @@ nobase_dist_doc_DATA += examples/kea4/all-keys.json
 nobase_dist_doc_DATA += examples/kea4/all-keys-netconf.json
 nobase_dist_doc_DATA += examples/kea4/all-options.json
 nobase_dist_doc_DATA += examples/kea4/backends.json
-nobase_dist_doc_DATA += examples/kea4/cassandra.json
 nobase_dist_doc_DATA += examples/kea4/classify.json
 nobase_dist_doc_DATA += examples/kea4/classify2.json
 nobase_dist_doc_DATA += examples/kea4/comments.json
@@ -45,7 +44,6 @@ nobase_dist_doc_DATA += examples/kea6/all-keys.json
 nobase_dist_doc_DATA += examples/kea6/all-keys-netconf.json
 nobase_dist_doc_DATA += examples/kea6/all-options.json
 nobase_dist_doc_DATA += examples/kea6/backends.json
-nobase_dist_doc_DATA += examples/kea6/cassandra.json
 nobase_dist_doc_DATA += examples/kea6/classify.json
 nobase_dist_doc_DATA += examples/kea6/classify2.json
 nobase_dist_doc_DATA += examples/kea6/comments.json

doc/devel/Doxyfile

@@ -873,7 +873,6 @@ INPUT                  = ../../src/bin/agent \
                          ../../src/lib/cfgrpt \
                          ../../src/lib/config \
                          ../../src/lib/config_backend \
-                         ../../src/lib/cql \
                          ../../src/lib/cryptolink \
                          ../../src/lib/d2srv \
                          ../../src/lib/database \

doc/devel/cross-compile.dox

@@ -102,7 +102,6 @@ a native (i.e. not cross-compiled) Kea build.
 
 Required and optional Kea dependencies, usually available as packages:
  - Python (built-in)
- - Cassandra (skipped here)
  - libssl-dev (built-in in the full image)
  - liblog4cplus-dev (in liblog4cplus package, load both the library and
   the development part)

doc/devel/unit-tests.dox

@@ -389,29 +389,6 @@ local   all             postgres                                trust
   section in the <a href="https://kea.readthedocs.io">Kea Administrator
   Reference Manual</a>).
 
-
- @subsection cqlUnitTestsPrerequisites Cassandra database
-
- @todo: Describe steps necessary to set up Cassandra database suitable
- for running unittests.
-
- It seems this was enough:
-
- -# Launch cassandra if not running (-f for foreground)
- @verbatim
- % cassandra -f
- @endverbatim
-
- The tool is cqlsh:
-
- -# Run the tool
- @verbatim
- % cqlsh
- Connected to Test Cluster at 127.0.0.1:9042.
- [cqlsh 5.0.1 | Cassandra 3.11.1 | CQL spec 3.4.4 | Native protocol v4]
- Use HELP for help.
- cqlsh> @endverbatim\n
-
 @section unitTestsKerberos Kerberos Configuration for Unit Tests
 
 The GSS-TSIG hook library uses the GSS-API with Kerberos. While there are

doc/examples/kea4/advanced.json

@@ -74,7 +74,7 @@
 
     // We need to specify the database used to store leases. As of
     // September 2016, four database backends are supported: MySQL,
-    // PostgreSQL, Cassandra, and the in-memory database, Memfile.
+    // PostgreSQL and the in-memory database, Memfile.
     // We'll use memfile  because it doesn't require any prior set up.
     // For memfile, it's important to always specify lfc-interval, so
     // the lease file would not grow without bounds and be sanitized

doc/examples/kea4/all-keys-netconf.json

@@ -309,7 +309,7 @@
                 // Port on which the database is available.
                 "port": 3306,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
+                // Type of the database, e.g. "mysql", "postgresql".
                 "type": "mysql",
 
                 // User name to be used to access the database.
@@ -331,41 +331,25 @@
                 // Port on which the database is available.
                 "port": 5432,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
+                // Type of the database, e.g. "mysql", "postgresql".
                 "type": "postgresql",
 
                 // User name to be used to access the database.
                 "user": "kea"
             },
             {
-                // Name of the database to connect to.
-                "keyspace": "kea",
-
-                // Host on which the database resides.
-                "contact-points": "127.0.0.1",
-
                 // Database password.
                 "password": "kea",
 
                 // Port on which the database is available.
                 "port": 9042,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
-                "type": "cql",
+                // Type of the database, e.g. "mysql", "postgresql".
+                "type": "mysql",
 
                 // User name to be used to access the database.
                 "user": "kea",
 
-                // Consistency level for all queries.
-                // Supported values: any, one, two, three, quorum, all,
-                // local-quorum, each-quorum, serial, local-serial, local-one.
-                "consistency": "quorum",
-
-                // Serial consistency level for all queries.
-                // Supported values: any, one, two, three, quorum, all,
-                // local-quorum, each-quorum, serial, local-serial, local-one.
-                "serial-consistency": "serial",
-
                 // Connection reconnect wait time.
                 // This parameter governs how long Kea waits before attempting
                 // to reconnect. Expressed in milliseconds. The default is 2000 [ms]
@@ -381,16 +365,7 @@
                 "on-fail": "stop-retry-exit",
 
                 // Connection connect timeout.
-                "connect-timeout": 100,
-
-                // Connection request timeout.
-                "request-timeout": 100,
-
-                // Connection tcp keepalive.
-                "tcp-keepalive": 100,
-
-                // Connection tcp nodelay.
-                "tcp-nodelay": true
+                "connect-timeout": 100
             }
         ],
 
@@ -481,8 +456,8 @@
             // because non stored leases will be lost upon Kea server restart.
             "persist": true,
 
-            // Lease database backend type, i.e. "memfile", "mysql",
-            // "postgresql" or "cql".
+            // Lease database backend type, i.e. "memfile", "mysql", or
+            // "postgresql".
             "type": "memfile"
         },
 
@@ -1023,7 +998,7 @@
                     // Name of the database to connect to.
                     "name": "config",
 
-                    // Type of the database, e.g. "mysql", "postgresql", "cql".
+                    // Type of the database, e.g. "mysql", "postgresql".
                     "type": "mysql"
                 }
             ],

doc/examples/kea4/all-keys.json

@@ -309,7 +309,7 @@
                 // Port on which the database is available.
                 "port": 3306,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
+                // Type of the database, e.g. "mysql", "postgresql".
                 "type": "mysql",
 
                 // User name to be used to access the database.
@@ -345,41 +345,25 @@
                 // Port on which the database is available.
                 "port": 5432,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
+                // Type of the database, e.g. "mysql", "postgresql".
                 "type": "postgresql",
 
                 // User name to be used to access the database.
                 "user": "kea"
             },
             {
-                // Name of the database to connect to.
-                "keyspace": "kea",
-
-                // Host on which the database resides.
-                "contact-points": "127.0.0.1",
-
                 // Database password.
                 "password": "kea",
 
                 // Port on which the database is available.
                 "port": 9042,
 
-                // Type of the database, e.g. "mysql", "postgresql", "cql".
-                "type": "cql",
+                // Type of the database, e.g. "mysql", "postgresql".
+                "type": "mysql",
 
                 // User name to be used to access the database.
                 "user": "kea",
 
-                // Consistency level for all queries.
-                // Supported values: any, one, two, three, quorum, all,
-                // local-quorum, each-quorum, serial, local-serial, local-one.
-                "consistency": "quorum",
-
-                // Serial consistency level for all queries.
-                // Supported values: any, one, two, three, quorum, all,
-                // local-quorum, each-quorum, serial, local-serial, local-one.
-                "serial-consistency": "serial",
-
                 // Connection reconnect wait time.
                 // This parameter governs how long Kea waits before attempting
                 // to reconnect. Expressed in milliseconds. The default is 2000 [ms]
@@ -395,16 +379,7 @@
                 "on-fail": "stop-retry-exit",
 
                 // Connection connect timeout.
-                "connect-timeout": 100,
-
-                // Connection request timeout.
-                "request-timeout": 100,
-
-                // Connection tcp keepalive.
-                "tcp-keepalive": 100,
-
-                // Connection tcp nodelay.
-                "tcp-nodelay": true
+                "connect-timeout": 100
             }
         ],
 
@@ -510,8 +485,8 @@
             // because non stored leases will be lost upon Kea server restart.
             "persist": true,
 
-            // Lease database backend type, i.e. "memfile", "mysql",
-            // "postgresql" or "cql".
+            // Lease database backend type, i.e. "memfile", "mysql" or
+            // "postgresql".
             "type": "memfile"
         },
 
@@ -1052,7 +1027,7 @@
                     // Name of the database to connect to.
                     "name": "config",
 
-                    // Type of the database, e.g. "mysql", "postgresql", "cql".
+                    // Type of the database, e.g. "mysql", "postgresql".
                     "type": "mysql"
                 }
             ],

doc/examples/kea4/backends.json

@@ -4,7 +4,6 @@
 // - memfile
 // - MySQL
 // - PostgreSQL
-// - CQL (Cassandra) backend
 
 { "Dhcp4":
 
@@ -66,21 +65,6 @@
 //      "connect-timeout": 3
 //  },
 
-// 4. CQL (Cassandra) backend. Leases will be stored in Cassandra
-// database. Make sure it is up, running and properly initialized. See
-// kea-admin documentation for details on how to initialize the
-// database. The only strictly required parameters are type, keyspace
-// and contact-points. At least one contact point must be specified, but
-// more than one is required for redundancy. Make sure you specify the
-// contact points without spaces. Kea must be compiled with --with-cql
-// option to use this backend.
-//  "lease-database": {
-//      "type": "cql",
-//      "keyspace": "keatest",
-//      "contact-points": "192.0.2.1,192.0.2.2,192.0.2.3",
-//      "port": 9042
-//  },
-
 // Addresses will be assigned with a lifetime of 4000 seconds.
   "valid-lifetime": 4000,
 

doc/examples/kea4/cassandra.json

-// This is an example configuration file for the DHCPv4 server in Kea.
-// It is a basic scenario with one IPv4 subnet configured. It demonstrates
-// how to configure Kea to use CQL (Cassandra) backend
-
-{ "Dhcp4":
-
-{
-// Kea is told to listen on ethX interface only.
-  "interfaces-config": {
-    "interfaces": [ "ethX" ]
-  },
-
-// 4. CQL (Cassandra) backend. Leases will be stored in Cassandra
-// database. Make sure it is up, running and properly initialized. See
-// kea-admin documentation for details on how to initialize the
-// database. The only strictly required parameters are type, keyspace
-// and contact-points. At least one contact point must be specified, but
-// more than one is required for redundancy. Make sure you specify the
-// contact points without spaces. Kea must be compiled with --with-cql
-// option to use this backend.
-  "lease-database": {
-      "type": "cql",
-      "keyspace": "keatest",
-      "contact-points": "192.0.2.1,192.0.2.2,192.0.2.3",
-      "port": 9042,
-
-      // Cassandra supports many additonal parameters that are typically
-      // not needed, but may be used to tweak your deployment.
-
-      // This parameter governs how long Kea waits before attempting
-      // to reconnect. Expressed in milliseconds. The default is 2000 [ms].
-      "reconnect-wait-time": 2000,
-
-      // This parameter sets the timeout for connecting to a node. Expressed
-      // in milliseconds. The default is 5000 [ms].
-      "connect-timeout": 5000,
-
-      // This parameter sets the timeout for waiting for a response
-      // from a node. Expressed in milliseconds. The default is 12000 [ms].
-      "request-timeout": 12000,
-
-      // This parameter governs the TCP keep-alive mechanism. Expressed
-      // in seconds of delay. The default is disabled. In this example
-      // it is set to 20 minutes.
-      "tcp-keepalive": 1200,
-
-      // This parameter enables/disables Nagle's algorithm on connections.
-      // The default is true.
-      "tcp-nodelay": true,
-
-      // This parameter configures consistency level. The default is "quorum".
-      // Supported values:
-      // - any
-      // - one
-      // - two
-      // - three
-      // - quorum
-      // - all
-      // - local-quorum
-      // - each-quorum
-      // - serial
-      // - local-serial
-      // - local-one
-      // See https://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlConfigConsistency.html for more details.
-      "consistency": "quorum",
-
-      // This parameter configures serial consistency level which manages
-      // lightweight transaction isolation. The default is "serial".
-      // Supported values:
-      // - any
-      // - one
-      // - two
-      // - three
-      // - quorum
-      // - all
-      // - local-quorum
-      // - each-quorum
-      // - serial
-      // - local-serial
-      // - local-one
-      // See https://docs.datastax.com/en/cassandra/3.0/cassandra/dml/dmlConfigSerialConsistency.html for more details.
-      "serial-consistency": "serial"
-  },
-
-// Addresses will be assigned with a lifetime of 4000 seconds.
-  "valid-lifetime": 4000,
-
-// Renew and rebind timers are commented out. This implies that options
-// 58 and 59 will not be sent to the client. In this case it is up to
-// the client to pick the timer values according to RFC2131. Uncomment the
-// timers to send these options to the client.
-//  "renew-timer": 1000,
-//  "rebind-timer": 2000,
-
-// The following list defines subnets. We have only one subnet
-// here. We tell Kea that it is directly available over local interface.
-  "subnet4": [
-    {
-       "pools": [ { "pool":  "192.0.2.1 - 192.0.2.200" } ],
-       "subnet": "192.0.2.0/24",
-       "interface": "ethX"
-    }
-  ],
-
-// The following configures logging. It assumes that messages with at
-// least informational level (info, warn, error and fatal) should be
-// logged to stdout.
-    "loggers": [
-        {
-            "name": "kea-dhcp4",
-            "output_options": [
-                {
-                    "output": "stdout"
-                }