Unverified Commit 935ed8de authored by Peter Goodspeed-Niklaus's avatar Peter Goodspeed-Niklaus Committed by GitHub
Browse files

add two node local net script (#1781)

* initial work running a two node local net

* use the right incantations so the nodes produce blocks together

* improve internal documentation
parent 27c3b75e
Pipeline #109594 passed with stages
in 17 minutes and 15 seconds
#!/usr/bin/env bash
# Run a two node local net.
# Unlike the docker-compose script in the /docker folder, this version builds the nodes based
# on the current state of the code, instead of depending on a published version.
set -e
PROJECT_ROOT=$(git rev-parse --show-toplevel)
# shellcheck disable=SC1090
source "$(dirname "$0")"/common.sh
find . -path ./target -prune -o -type f -name '*.rs' -printf '%T@ %p\n' |
sort -nr |
head -1 |
cut -d' ' -f2-
# ensure the polkadot binary exists and is up to date
if [ ! -x "$polkadot" ] || [ "$polkadot" -ot "$last_modified_rust_file" ]; then
cargo build --release
# setup variables
declare -a node_pids
declare -a node_pipes
# create a sed expression which injects the node name and stream type into each line
function make_sed_expr() {
printf "s/^/%8s %s: /" "$name" "$type"
# turn a string into a flag
function flagify() {
printf -- '--%s' "$(tr '[:upper:]' '[:lower:]' <<< "$1")"
# start a node and label its output
# This function takes a single argument, the node name.
# The name must be one of those which can be passed to the polkadot binary, in un-flagged form,
# one of:
# alice, bob, charlie, dave, eve, ferdie, one, two
function run_node() {
# create a named pipe so we can get the node's PID while also sedding its output
local stdout
local stderr
stdout=$(mktemp --dry-run --tmpdir)
stderr=$(mktemp --dry-run --tmpdir)
mkfifo "$stdout"
mkfifo "$stderr"
# compute ports from offset
local port=$((30333+node_offset))
local rpc_port=$((9933+node_offset))
local ws_port=$((9944+node_offset))
# start the node
"$polkadot" \
--chain polkadot-local \
--tmp \
--port "$port" \
--rpc-port "$rpc_port" \
--ws-port "$ws_port" \
--rpc-cors all \
"$(flagify "$name")" \
> "$stdout" \
2> "$stderr" \
local pid=$!
# send output from the stdout pipe to stdout, prepending the node name
sed -e "$(make_sed_expr "$name" "OUT")" "$stdout" >&1 &
# send output from the stderr pipe to stderr, prepending the node name
sed -e "$(make_sed_expr "$name" "ERR")" "$stderr" >&2 &
# clean up the nodes when this script exits
function finish {
for node_pid in "${node_pids[@]}"; do
kill -9 "$node_pid"
for node_pipe in "${node_pipes[@]}"; do
rm "$node_pipe"
trap finish EXIT
# start the nodes
run_node Alice
run_node Bob
# now wait; this will exit on its own only if both subprocesses exit
# the practical implication, as both subprocesses are supposed to run forever, is that
# this script will also run forever, until killed, at which point the exit trap should kill
# the subprocesses
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