Move CI flow from Travis CI to GitHub Actions

.github/workflows/scripts/lib/testing.sh

@@ -0,0 +1,115 @@
+#!/usr/bin/env bash
+
+# Log a message.
+function log {
+	echo -e "\n[+] $1\n"
+}
+
+# Log an error.
+function err {
+	echo -e "\n[x] $1\n"
+}
+
+# Return the ID of the container running the given service.
+function container_id {
+	local svc=$1
+
+	local label
+	if [[ "$MODE" == "swarm" ]]; then
+		label="com.docker.swarm.service.name=elk_${svc}"
+	else
+		label="com.docker.compose.service=${svc}"
+	fi
+
+	local cid
+	# retry for max 60s (30*2s)
+	for _ in $(seq 1 30); do
+		cid="$(docker container ls -aq -f label="$label")"
+		if [ -n "$cid" ]; then
+			break
+		fi
+
+		echo -n '.' >&2
+		sleep 2
+	done
+	echo -e '\n' >&2
+
+	if [ -z "${cid:-}" ]; then
+		err "Timed out waiting for creation of container with label ${label}"
+		return 1
+	fi
+
+	echo "$cid"
+}
+
+# Return the IP address at which a service can be reached.
+# In Compose mode, returns the container's IP.
+# In Swarm mode, returns the IP of the node to ensure traffic enters the routing mesh (ingress).
+function service_ip {
+	local svc=$1
+
+	local ip
+
+	if [[ "$MODE" == "swarm" ]]; then
+		#ingress_net="$(docker network inspect ingress --format '{{ .Id }}')"
+		#ip="$(docker service inspect elk_"$svc" --format "{{ range .Endpoint.VirtualIPs }}{{ if eq .NetworkID \"${ingress_net}\" }}{{ .Addr }}{{ end }}{{ end }}" | cut -d/ -f1)"
+		node="$(docker node ls --format '{{ .ID }}')"
+		ip="$(docker node inspect "$node" --format '{{ .Status.Addr }}')"
+		if [ -z "${ip:-}" ]; then
+			err "Node ${node} has no IP address"
+			return 1
+		fi
+
+		echo "$ip"
+		return
+	fi
+
+	local cid
+	cid="$(container_id "$svc")"
+
+	ip="$(docker container inspect "$cid" --format '{{ (index .NetworkSettings.Networks "docker-elk_elk").IPAddress }}')"
+	if [ -z "${ip:-}" ]; then
+		err "Container ${cid} has no IP address"
+		return 1
+	fi
+
+	echo "$ip"
+}
+
+# Poll the given service at the given port:/path until it responds with HTTP code 200.
+function poll_ready {
+	local cid=$1
+	local url=$2
+
+	local -a args=( '-s' '-D-' '-m3' '-w' '%{http_code}' "$url" )
+	if [ "$#" -ge 3 ]; then
+		args+=( '-u' "$3" )
+	fi
+
+	echo "curl arguments: ${args[*]}"
+
+	local -i result=1
+	local output
+
+	# retry for max 180s (36*5s)
+	for _ in $(seq 1 36); do
+		if [[ $(docker container inspect "$cid" --format '{{ .State.Status}}') == 'exited' ]]; then
+			err "Container exited ($(docker container inspect "$cid" --format '{{ .Name }}'))"
+			return 1
+		fi
+
+		output="$(curl "${args[@]}" || true)"
+		if [ "${output: -3}" -eq 200 ]; then
+			result=0
+			break
+		fi
+
+		echo -n 'x' >&2
+		sleep 5
+	done
+	echo -e '\n' >&2
+
+	echo -e "\n${output::-3}"
+
+	return $result
+}