shell script for simple network-delay test

scripts/run_consensus_network_delay.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+
+set -euo pipefail
+
+NETWORK_DELAY=${NETWORK_DELAY:-500}
+BUILD_IMAGE=${BUILD_IMAGE:-true}
+NODES=${NODES:-"Node0:Node1:Node2:Node3:Node4"}
+
+function build_test_image() {
+    docker build -t aleph-node:network_tests -f docker/Dockerfile.network_tests .
+}
+
+function set_network_delay() {
+    local node=$1
+    local delay=$2
+
+    log "setting network delay for node $node"
+    docker exec $node tc qdisc add dev eth1 root netem delay ${delay}ms
+}
+
+function log() {
+    echo "$1" 1>&2
+}
+
+function into_array() {
+    result=()
+    local tmp=$IFS
+    IFS=:
+    for e in $1; do
+        result+=($e)
+    done
+    IFS=$tmp
+}
+
+into_array $NODES
+NODES=(${result[@]})
+
+if [[ "$BUILD_IMAGE" = true ]]; then
+    log "building docker image for network tests"
+    build_test_image
+fi
+
+log "starting network"
+OVERRIDE_DOCKER_COMPOSE=./docker/docker-compose.network_test.yml DOCKER_COMPOSE=./docker/docker-compose.bridged.yml ./.github/scripts/run_consensus.sh 1>&2
+log "network started"
+
+log "setting network delay"
+for node in ${NODES[@]}; do
+    set_network_delay $node $NETWORK_DELAY
+done
+
+log "done"