Add script to poll for changing IPs

[kiryazovi-redis]

Written with the help of claude.
Added testing also for it.

[Copilot]

Pull Request Overview

Adds a shell script to poll for new Redis cluster node IPs and notify on endpoint changes, along with a mock and test harness.

• Introduce tools/inform_dmc.sh to detect and wait for new node IPs, then print notification commands.
• Add a reusable tools/mock_rladmin to simulate rladmin status.
• Provide tools/test_inform_dmc.sh to run end-to-end tests with backup and restoration of the mock.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 5 comments.

File	Description
tools/inform_dmc.sh	Main polling script: fetches endpoint, waits for new IPs, builds notification commands.
tools/mock_rladmin	Static mock of rladmin status output for testing.
tools/test_inform_dmc.sh	Test harness that backs up real mock, injects initial state, simulates new nodes, and runs the script.

Comments suppressed due to low confidence (1)

tools/inform_dmc.sh:109

• [nitpick] Setting DMC_ID to the same value as EP_CURR can be confusing; consider consolidating or renaming one variable for clarity.

DMC_ID=$NODE_ID

[Copilot]

[nitpick] This duplicates the mock definition that also lives in tools/mock_rladmin; consider centralizing the mock data to avoid drift.

Suggested change

	# Create initial mock_rladmin with 3 nodes
	cat > tools/mock_rladmin << 'EOF'
	#!/bin/bash
	cat << 'EEOF'
	CLUSTER NODES:
	NODE:ID ROLE ADDRESS EXTERNAL_ADDRESS HOSTNAME SHARDS CORES FREE_RAM PROVISIONAL_RAM VERSION STATUS
	*node:1 master 192.168.1.125 3.231.216.156 node1 0/0 2 5.45GB/7.61GB 0KB/0KB 7.16.0-37 OK
	node:2 slave 192.168.1.221 44.192.130.255 node2 1/300 4 5.58GB/7.61GB 4.06GB/6.09GB 7.16.0-37 OK
	node:3 slave 192.168.1.92 3.236.194.65 node3 1/300 4 5.59GB/7.61GB 4.07GB/6.09GB 7.16.0-37 OK
	DATABASES:
	DB:ID NAME TYPE MODULE STATUS SHARDS PLACEMENT REPLICATION PERSISTENCE ENDPOINT CRDB
	db:51417897 db redis yes active 1 dense enabled disabled redis-18979.internal.c102815.us-east-1-4.ec2.qa-cloud.rlrcp.com:18979/redis-18979.c102815.us-east-1-4.ec2.qa-cloud.rlrcp.com:18979 no
	ENDPOINTS:
	DB:ID NAME ID NODE ROLE SSL
	db:51417897 db endpoint:51417897:1 node:3 single No
	SHARDS:
	DB:ID NAME ID NODE ROLE SLOTS USED_MEMORY STATUS
	db:51417897 db redis:1 node:3 master 0-16383 2.46MB OK
	db:51417897 db redis:2 node:2 slave 0-16383 1.97MB OK
	EEOF
	EOF
	# Use the existing mock_rladmin file as the source of truth
	cp tools/mock_rladmin tools/mock_rladmin.bak

[Copilot]

The clean_output function is never called; remove it or integrate its logic where needed to keep the codebase lean.

Suggested change

	# Clean function to remove timestamps and extra spaces
	clean_output() {
	sed 's/\[[^]]*\]//g' | sed 's/^ *//;s/ *$//' | grep -v '^$'
	}
	# (Remove the `clean_output` function entirely)

[Copilot]

The quoting around msg_payload is complex and error-prone; consider using a here-document or simpler quoting to ensure the JSON string is built correctly.

Suggested change

	msg_payload=\'$(printf '{"version": "0.1", "meta": { "bdb": "%s"}, "message": ["MOVING",30,"%s:%s"]}' "$DB_ID" "$EP_TO_IP" "$DB_PORT")\'
	msg_payload=$(cat <<EOF
	{
	"version": "0.1",
	"meta": {
	"bdb": "$DB_ID"
	},
	"message": [
	"MOVING",
	30,
	"$EP_TO_IP:$DB_PORT"
	]
	}
	EOF
	)