initial version of the Amazon ECS Cluster plugin (#608)

* initial version of the  Amazon ECS Cluster plugin

* fix shellcheck errors

AWS/ecs-cluster.10m.sh

@@ -0,0 +1,55 @@
+#!/bin/sh
+# <bitbar.title>Amazon ECS Cluster Status</bitbar.title>
+# <bitbar.version>v1.0</bitbar.version>
+# <bitbar.author>Bob Zoller</bitbar.author>
+# <bitbar.author.github>bobzoller</bitbar.author.github>
+# <bitbar.desc>Shows statistics about your Amazon ECS cluster.</bitbar.desc>
+# <bitbar.dependencies>awscli,jq</bitbar.dependencies>
+
+# Dependencies: 
+#   awscli (https://aws.amazon.com/cli/)
+#   jq (https://stedolan.github.io/jq/)
+
+AWS_CLI_PROFILE="default"
+ECS_CLUSTER=""
+
+export PATH="$PATH:/usr/local/bin"
+
+if [ -z "$ECS_CLUSTER" ]; then
+  echo "Missing configuration: cluster name"
+  exit 1
+fi
+
+data=$( aws --profile $AWS_CLI_PROFILE ecs list-container-instances --output json --cluster $ECS_CLUSTER )
+instance_ids=$( echo "$data" | jq -r '.containerInstanceArns | map(. | split("/") | last) | join(" ")' )
+
+data=$( aws --profile $AWS_CLI_PROFILE ecs describe-container-instances --output json --cluster $ECS_CLUSTER --container-instances "$instance_ids" )
+instance_count=$( echo "$data" | jq -r '.containerInstances | length' )
+
+total_memory=$(( $( echo "$data" | jq -r '.containerInstances | map(.registeredResources[] | select(.name == "MEMORY") | .integerValue) | add' ) / 1000 ))
+remaining_memory=$(( $( echo "$data" | jq -r '.containerInstances | map(.remainingResources[] | select(.name == "MEMORY") | .integerValue) | add' ) / 1000 ))
+reserved_memory=$(( total_memory - remaining_memory ))
+usage_memory=$( echo "$reserved_memory * 100 / $total_memory" | bc )
+
+total_cpu=$( echo "$data" | jq -r '.containerInstances | map(.registeredResources[] | select(.name == "CPU") | .integerValue) | add' )
+remaining_cpu=$( echo "$data" | jq -r '.containerInstances | map(.remainingResources[] | select(.name == "CPU") | .integerValue) | add' )
+reserved_cpu=$(( total_cpu - remaining_cpu ))
+usage_cpu=$( echo "$reserved_cpu * 100 / $total_cpu" | bc )
+
+mono() {
+  echo "$1 | font=Monaco trim=false"
+}
+
+echo "#:${instance_count} C:${usage_cpu}% M:${usage_memory}%"
+echo "---"
+mono "Instances:"
+mono "  Count:    ${instance_count}"
+mono "Memory:"
+mono "  Total:    ${total_memory} GB"
+mono "  Reserved: ${reserved_memory} GB"
+mono "  Free:     ${remaining_memory} GB"
+mono "CPU:"
+mono "  Total:    ${total_cpu} shares"
+mono "  Reserved: ${reserved_cpu} shares"
+mono "  Free:     ${remaining_cpu} shares"
+