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568e7b7 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 | #!/usr/bin/env bash
# Cadence — install deps (if needed) and start the dashboard on http://localhost:8000
#
# bash run.sh → port 8000
# PORT=8010 bash run.sh → custom port
#
# If the browser says "not answering on 127.0.0.1:8000", this script tells you why
# instead of exiting quietly.
set -uo pipefail
cd "$(dirname "$0")"
PORT="${PORT:-8000}"
bold() { printf '\033[1m%s\033[0m\n' "$*"; }
ok() { printf ' \033[32m✓\033[0m %s\n' "$*"; }
bad() { printf ' \033[31m✗\033[0m %s\n' "$*"; }
warn() { printf ' \033[33m!\033[0m %s\n' "$*"; }
die() { bad "$1"; shift; for line in "$@"; do echo " $line"; done; exit 1; }
# ── 1. python itself ─────────────────────────────────────────────────────────
if ! command -v python3 >/dev/null 2>&1; then
die "python3 is not installed." \
"macOS: brew install python (or install from python.org)" \
"Debian/Ubuntu: sudo apt install python3 python3-venv python3-pip"
fi
PYV="$(python3 -c 'import sys;print("%d.%d"%sys.version_info[:2])' 2>/dev/null || echo "?")"
case "$PYV" in
3.9|3.1[0-9]|3.[2-9][0-9]|[4-9].*) ok "python $PYV" ;;
*) die "python $PYV is too old — Cadence needs 3.9 or newer." \
"Install a newer python3, then run: bash run.sh" ;;
esac
# ── 2. is the port already taken? ────────────────────────────────────────────
port_busy() {
if command -v ss >/dev/null 2>&1; then ss -ltn 2>/dev/null | grep -q ":${PORT} "; return $?; fi
if command -v lsof >/dev/null 2>&1; then lsof -iTCP:"${PORT}" -sTCP:LISTEN >/dev/null 2>&1; return $?; fi
return 1
}
if port_busy; then
# A Cadence backend already listening is fine — say so, don't start a second one.
if curl -fsS -m 3 "http://127.0.0.1:${PORT}/healthz" >/dev/null 2>&1; then
ok "Cadence is already running on http://localhost:${PORT}"
echo
echo " Open http://localhost:${PORT} — nothing else to do."
echo " (Stop the old one first if you want a restart.)"
exit 0
fi
die "port ${PORT} is already used by another program." \
"Start Cadence on a different port: PORT=8010 bash run.sh" \
"See what holds it: lsof -iTCP:${PORT} -sTCP:LISTEN (or: ss -ltnp | grep ${PORT})"
fi
# ── 3. dependencies ──────────────────────────────────────────────────────────
have_deps() { "$1" -c 'import flask, yt_dlp, ytmusicapi, requests' >/dev/null 2>&1; }
PY=python3
if have_deps python3; then
ok "dependencies already available"
else
bold "Installing dependencies (first run only)"
if python3 -m pip install -q -r requirements.txt >/dev/null 2>&1 && have_deps python3; then
ok "installed into system python"
else
# PEP 668 "externally managed" systems (Debian, Ubuntu, Homebrew) refuse system pip
warn "system pip declined — using a local virtualenv in ./.venv"
if [ ! -d .venv ]; then
python3 -m venv .venv >/dev/null 2>&1 || die "could not create .venv" \
"Debian/Ubuntu: sudo apt install python3-venv then re-run: bash run.sh" \
"macOS: brew install python then re-run: bash run.sh"
fi
./.venv/bin/pip install -q -r requirements.txt || die "pip install failed" \
"Check your internet connection, then re-run: bash run.sh" \
"Behind a proxy? export HTTPS_PROXY=http://host:port"
have_deps ./.venv/bin/python || die "dependencies still missing after install" \
"Try: rm -rf .venv && bash run.sh"
ok "installed into ./.venv"
PY=./.venv/bin/python
fi
fi
# ── 4. start ─────────────────────────────────────────────────────────────────
bold "Starting Cadence on http://localhost:${PORT}"
echo " (Ctrl+C stops it)"
echo
PORT="$PORT" exec "$PY" app.py
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