Add unconditional Consul key delete1.1.1-consul-loader-container

Add a script to consul-loader-container that
attempts to delete a Consul key and ignores
failures rather than looping indefinitely.
This will allow us to safely add a k8s Job
to each DCAE microservice's Helm chart to delete
the microservice's Consul configuration key when
the microservice is undeployed using Helm.

Issue-ID: DCAEGEN2-2669
Signed-off-by: Jack Lucas <jflos@sonoris.net>
Change-Id: I0e9534c4b488d3a3f7248434712900ed5b593489

3 files changed, 58 insertions, 1 deletions

diff --git a/consul-loader-container/Changelog.md b/consul-loader-container/Changelog.md
index 88d4818..e065dea 100644
--- a/consul-loader-container/Changelog.md
+++ b/consul-loader-container/Changelog.md
@@ -4,6 +4,13 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.1.1] - 2021-08-23:
+To address https://jira.onap.org/browse/DCAEGEN2-2669, added a new script
+(delete_key.sh) that  attempts to delete a Consul key and ignores failures
+rather than looping indefinitely. This will allow us to safely add a k8s Job
+to each DCAE microservice's Helm chart to delete the microservice's Consul
+configuration key when the microservice is undeployed using Helm.
+
 ## [1.1.0] - 2021-02-05:
 In support of deploying DCAE service components using Helm, the Consul loader
 has been enhanced to:
diff --git a/consul-loader-container/delete_key.sh b/consul-loader-container/delete_key.sh
new file mode 100755
index 0000000..bc7daec
--- /dev/null
+++ b/consul-loader-container/delete_key.sh
@@ -0,0 +1,50 @@
+#!/bin/bash
+# ================================================================================
+# Copyright (c) 2021 J. F. Lucas. All rights reserved.
+# ================================================================================
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# ============LICENSE_END=========================================================
+
+# Delete a single key-value pair from the Consul KV store, with no error checking.
+# (To have full error checking, using the --delete-key option on the consul_store.sh
+# script.)
+# This script is intended for use with a Kubernetes Job that deletes the Consul KV pair
+# holding the application configuration data for a DCAE microservice, when the microservice
+# is undeployed via Helm.  The reason for ignoring errors is that sometimes when a full
+# ONAP deployment is being undeployed, Consul becomes unavailable before a microservice
+# is deleted.  If we do a Consul delete with error checking using the consul.sh script,
+# the Kubernetes Job loops indefinitely waiting for Consul to become available.  This
+# script simply sends a delete key request to Consul and ignores the result.
+#
+# Note that failing to delete the application configuration from Consul is
+# not harmful.  If a DCAE microservice is undeployed then deployed again, the
+# configuration information for the new instance will overwrite the old configuration.
+#
+# Environment variables control the Consul address used:
+#   -- CONSUL_PROTO:  The protocol (http or https) used to access consul.  DEFAULT: http
+#   -- CONSUL_HOST: The Consul host address.  DEFAULT: consul
+#   -- CONSUL_PORT: The Consul API port.  DEFAULT: 8500
+#
+# The command accepts a single argument, the name of the key to be deleted.
+#
+set -x
+CONSUL_ADDR=${CONSUL_PROTO:-http}://${CONSUL_HOST:-consul}:${CONSUL_PORT:-8500}
+KV_URL=${CONSUL_ADDR}/v1/kv
+
+if [ "$#" -lt 1 ]
+then
+  echo "Command requires at least one argument"
+  exit 0 # deliberately masking the error
+fi
+curl -v -X DELETE "${KV_URL}/$1"
+exit 0 # mask any error
diff --git a/consul-loader-container/pom.xml b/consul-loader-container/pom.xml
index f347ef9..f7d5e62 100644
--- a/consul-loader-container/pom.xml
+++ b/consul-loader-container/pom.xml
@@ -28,7 +28,7 @@ limitations under the License.
   <groupId>org.onap.dcaegen2.deployments</groupId>
   <artifactId>consul-loader-container</artifactId>
   <name>dcaegen2-deployments-consul-loader-container</name>
-  <version>1.1.0</version>
+  <version>1.1.1</version>
   <url>http://maven.apache.org</url>
   <properties>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>