Allow Cassandra schema builder to use credentials (#1635)

* Allow Cassandra schema builder to use credentials

Currently the Cassandra schema builder job only works on open Cassandra installations. This PR fixes this by modifying the script so that two environmental variables, CASSANDRA_USER and CASSANDRA_PASSWORD, could be passed in to supply these credentials.

Signed-off-by: E.G. Hornbostel <eg.hornbostel@pricespider.com>

* Fixed missing semi-colon

Signed-off-by: E.G. Hornbostel <eg.hornbostel@pricespider.com>

plugin/storage/cassandra/schema/docker.sh

@@ -11,6 +11,8 @@ DATACENTER=${DATACENTER:-"dc1"}
 KEYSPACE=${KEYSPACE:-"jaeger_v1_${DATACENTER}"}
 MODE=${MODE:-"test"}
 TEMPLATE=${TEMPLATE:-""}
+USER=${CASSANDRA_USERNAME:-""}
+PASSWORD=${CASSANDRA_PASSWORD:-""}
 
 total_wait=0
 while true
@@ -31,4 +33,9 @@ done
 
 echo "Generating the schema for the keyspace ${KEYSPACE} and datacenter ${DATACENTER}"
 
-MODE="${MODE}" DATACENTER="${DATACENTER}" KEYSPACE="${KEYSPACE}" /cassandra-schema/create.sh "${TEMPLATE}" | ${CQLSH} ${CQLSH_SSL} ${CQLSH_HOST}
+
+if [ -z "$PASSWORD" ]; then
+  MODE="${MODE}" DATACENTER="${DATACENTER}" KEYSPACE="${KEYSPACE}" /cassandra-schema/create.sh "${TEMPLATE}" | ${CQLSH} ${CQLSH_SSL} ${CQLSH_HOST}
+else
+  MODE="${MODE}" DATACENTER="${DATACENTER}" KEYSPACE="${KEYSPACE}" /cassandra-schema/create.sh "${TEMPLATE}" | ${CQLSH} ${CQLSH_SSL} ${CQLSH_HOST} -u ${USER} -p ${PASSWORD}
+fi