travis: Move reusable functions to bash lib

.travis.yml

@@ -24,12 +24,12 @@ before_script:
   - sed -i 's/\(password =>\) "changeme"/\1 "testpasswd"/g' logstash/pipeline/logstash.conf
 
 script:
-  # Compose
+  # Core Elastic Stack
   - docker-compose up -d elasticsearch
   - sleep 30
   - .travis/elasticsearch-setup-passwords.exp
   - docker-compose up -d
-  - .travis/run-tests.sh
+  - .travis/run-tests-core.sh
   - docker-compose ps
   - docker-compose logs elasticsearch
   - docker-compose logs kibana
@@ -45,7 +45,7 @@ script:
   - .travis/elasticsearch-setup-passwords.exp swarm
   - docker service scale elk_kibana=1 --detach=false
   - docker service scale elk_logstash=1 --detach=false
-  - .travis/run-tests.sh swarm
+  - .travis/run-tests-core.sh swarm
   - docker stack services elk
   - docker service logs elk_elasticsearch
   - docker service logs elk_kibana

.travis/lib/testing.sh

@@ -0,0 +1,50 @@
+#!/usr/bin/env bash
+
+function log {
+	echo -e "\n[+] $1\n"
+}
+
+function poll_ready {
+	local svc=$1
+	local url=$2
+
+	local -a args=( '-s' '-D-' '-w' '%{http_code}' "$url" )
+	if [ "$#" -ge 3 ]; then
+		args+=( '-u' "$3" )
+	fi
+
+	local label
+	if [ "$MODE" == "swarm" ]; then
+		label="com.docker.swarm.service.name=elk_${svc}"
+	else
+		label="com.docker.compose.service=${svc}"
+	fi
+
+	local -i result=1
+	local cid
+	local output
+
+	# retry for max 120s (24*5s)
+	for _ in $(seq 1 24); do
+		cid="$(docker ps -q -f label="$label")"
+		if [ -z "${cid:-}" ]; then
+			echo "Container exited"
+			return 1
+		fi
+
+		set +e
+		output="$(curl "${args[@]}")"
+		set -e
+		if [ "${output: -3}" -eq 200 ]; then
+			result=0
+			break
+		fi
+
+		echo -n '.'
+		sleep 5
+	done
+
+	echo -e "\n${output::-3}"
+
+	return $result
+}

.travis/run-tests-core.sh

@@ -3,67 +3,22 @@
 set -eu
 set -o pipefail
 
-function log {
-	echo -e "\n[+] $1\n"
-}
 
-function poll_ready {
-	local svc=$1
-	local url=$2
+source "$(dirname ${BASH_SOURCE[0]})/lib/testing.sh"
 
-	local -a args=( '-s' '-D-' '-w' '%{http_code}' "$url" )
-	if [ "$#" -ge 3 ]; then
-		args+=( '-u' "$3" )
-	fi
-
-	local label
-	if [ "$MODE" == "swarm" ]; then
-		label="com.docker.swarm.service.name=elk_${svc}"
-	else
-		label="com.docker.compose.service=${svc}"
-	fi
-
-	local -i result=1
-	local cid
-	local output
-
-	# retry for max 120s (24*5s)
-	for _ in $(seq 1 24); do
-		cid="$(docker ps -q -f label="$label")"
-		if [ -z "${cid:-}" ]; then
-			echo "Container exited"
-			return 1
-		fi
-
-		set +e
-		output="$(curl "${args[@]}")"
-		set -e
-		if [ "${output: -3}" -eq 200 ]; then
-			result=0
-			break
-		fi
-
-		echo -n '.'
-		sleep 5
-	done
-
-	echo -e "\n${output::-3}"
-
-	return $result
-}
 
 declare MODE=""
 if [ "$#" -ge 1 ]; then
 	MODE=$1
 fi
 
-log 'Waiting for Elasticsearch readiness'
+log 'Waiting for readiness of Elasticsearch'
 poll_ready elasticsearch 'http://localhost:9200/' 'elastic:testpasswd'
 
-log 'Waiting for Kibana readiness'
+log 'Waiting for readiness of Kibana'
 poll_ready kibana 'http://localhost:5601/api/status' 'kibana:testpasswd'
 
-log 'Waiting for Logstash readiness'
+log 'Waiting for readiness of Logstash'
 poll_ready logstash 'http://localhost:9600/_node/pipelines/main?pretty'
 
 log 'Creating Logstash index pattern in Kibana'

README.md

@@ -59,8 +59,8 @@ Other available stack variants:
 
 ### Host setup
 
-* [Docker Engine](https://docs.docker.com/install/) version **17.05+** or newer
-* [Docker Compose](https://docs.docker.com/compose/install/) version **1.20.0+** or newer
+* [Docker Engine](https://docs.docker.com/install/) version **17.05** or newer
+* [Docker Compose](https://docs.docker.com/compose/install/) version **1.20.0** or newer
 * 1.5 GB of RAM
 
 > :information_source: Especially on Linux, make sure your user has the [required permissions][linux-postinstall] to