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51 lines
2.1 KiB
Bash
51 lines
2.1 KiB
Bash
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#!/bin/bash
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set -euo pipefail
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# pw-throttle.sh — apply CPU + network throttling to a playwright-cli Chromium
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# session so UI can be verified as it behaves on low-spec devices / slow networks.
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#
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# @playwright/cli has no throttle command, so this wraps a CDP call via `run-code`.
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# The throttle is set on the page target and persists for the life of the session:
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# apply it once, then run the usual playwright-cli goto/snapshot/screenshot commands
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# on the same -s=<session>. CDP is Chromium-only, so this works on chrome/msedge
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# sessions but not firefox/webkit.
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usage() {
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echo "Usage: ./scripts/pw-throttle.sh <session> <profile>"
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echo " profiles:"
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echo " mid 4x CPU + ~1.6 Mbps / 750 Kbps / 150ms (mid-tier phone, Lighthouse mobile default)"
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echo " low 6x CPU + ~400 Kbps / 400 Kbps / 400ms (low-end phone / poor connection)"
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echo " cpu4 4x CPU, full-speed network (isolate JS cost)"
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echo " cpu6 6x CPU, full-speed network (isolate JS cost)"
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echo " off reset to full speed"
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}
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if [ "$#" -lt 2 ]; then
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usage >&2
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exit 1
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fi
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session="$1"
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profile="$2"
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# downloadThroughput / uploadThroughput are bytes/sec; latency is ms.
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# A value <= 0 for throughput/latency disables that part of network throttling.
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case "$profile" in
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mid) cpu=4; down=200000; up=93750; lat=150 ;;
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low) cpu=6; down=50000; up=50000; lat=400 ;;
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cpu4) cpu=4; down=-1; up=-1; lat=0 ;;
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cpu6) cpu=6; down=-1; up=-1; lat=0 ;;
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off) cpu=1; down=-1; up=-1; lat=0 ;;
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*) echo "pw-throttle: unknown profile '$profile'" >&2; usage >&2; exit 1 ;;
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esac
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echo "pw-throttle: applying '$profile' to session '$session' (cpu ${cpu}x, down ${down} B/s, up ${up} B/s, latency ${lat} ms; Chromium only)"
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playwright-cli -s="$session" run-code "async page => {
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const client = await page.context().newCDPSession(page);
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await client.send('Network.enable');
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await client.send('Emulation.setCPUThrottlingRate', { rate: $cpu });
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await client.send('Network.emulateNetworkConditions', { offline: false, downloadThroughput: $down, uploadThroughput: $up, latency: $lat });
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}"
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