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fix(aircraft): coalesce refreshes and cool down OpenSky failures

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Said committed 2026-10-20 00:25:17 +01:00
1 parent de2138e84c
commit ed2f0685e0
4 files changed
+333 -158
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server/providers/aircraft/adsb-lol.js
+64 -47
View File
@@ -1,4 +1,7 @@
import { readResponseTextCapped } from '../common/http.js';
import {
coalesceProxyRequest,
readResponseTextCapped,
} from '../common/http.js';
/**
* Vite plugin: adsb.lol military aircraft proxy with 12 s response cache.
@@ -19,6 +22,7 @@ import { readResponseTextCapped } from '../common/http.js';
export function adsbLolProxy() {
/** @type {string|null} Cached upstream JSON body. */
let _cache = null;
const inFlight = new Map();
/** @type {number} Epoch-ms when the cache was populated. */
let _cacheAt = 0;
/** @type {number} Epoch-ms until which upstream is not contacted. */
@@ -104,60 +108,73 @@ export function adsbLolProxy() {
);
return;
}
const signal = AbortSignal.timeout(UPSTREAM_TIMEOUT_MS);
const upstream = await fetch('https://api.adsb.lol/v2/mil', {
headers: { 'User-Agent': 'gods-eye-view-adsblol-proxy/1.0' },
signal,
});
if (upstream.ok) {
const refresh = coalesceProxyRequest(inFlight, 'global', async () => {
const result = (status, body, cacheStatus, extra = {}) => ({
status,
body,
cacheStatus,
extra,
});
const signal = AbortSignal.timeout(UPSTREAM_TIMEOUT_MS);
const upstream = await fetch('https://api.adsb.lol/v2/mil', {
headers: { 'User-Agent': 'gods-eye-view-adsblol-proxy/1.0' },
signal,
});
if (upstream.ok) {
const body = await readResponseTextCapped(
upstream,
ADSBLOL_MIL_MAX_RESPONSE_BYTES,
signal,
);
_cache = body;
_cacheAt = Date.now();
_cooldownUntil = 0;
_cooldownStatus = 0;
return result(200, body, 'MISS');
}
if (upstream.status === 429 || upstream.status >= 500) {
const failedAt = Date.now();
_cooldownUntil = failedAt + cooldownFor(upstream, failedAt);
_cooldownStatus = upstream.status;
console.warn(
`[adsb.lol Proxy] upstream ${upstream.status}; cooling down ${Math.round((_cooldownUntil - Date.now()) / 1000)} s${_cache ? ', serving stale' : ''}`,
);
if (_cache) {
// Do not wait for a failing response body before serving usable data.
upstream.body?.cancel().catch(() => {});
return result(200, _cache, 'STALE', {
'X-ADS-B-Upstream-Status': String(upstream.status),
'X-ADS-B-Retry-After-Seconds': String(
Math.ceil((_cooldownUntil - Date.now()) / 1000),
),
});
}
}
const body = await readResponseTextCapped(
upstream,
ADSBLOL_MIL_MAX_RESPONSE_BYTES,
signal,
);
_cache = body;
_cacheAt = Date.now();
_cooldownUntil = 0;
_cooldownStatus = 0;
serve(res, 200, body, 'MISS');
return;
}
if (upstream.status === 429 || upstream.status >= 500) {
const failedAt = Date.now();
_cooldownUntil = failedAt + cooldownFor(upstream, failedAt);
_cooldownStatus = upstream.status;
console.warn(
`[adsb.lol Proxy] upstream ${upstream.status}; cooling down ${Math.round((_cooldownUntil - Date.now()) / 1000)} s${_cache ? ', serving stale' : ''}`,
return result(
upstream.status,
body,
'MISS',
_cooldownUntil > Date.now()
? {
'Retry-After': String(
Math.ceil((_cooldownUntil - Date.now()) / 1000),
),
}
: {},
);
if (_cache) {
// Do not wait for a failing response body before serving usable data.
upstream.body?.cancel().catch(() => {});
serve(res, 200, _cache, 'STALE', {
'X-ADS-B-Upstream-Status': String(upstream.status),
'X-ADS-B-Retry-After-Seconds': String(
Math.ceil((_cooldownUntil - Date.now()) / 1000),
),
});
return;
}
}
const body = await readResponseTextCapped(
upstream,
ADSBLOL_MIL_MAX_RESPONSE_BYTES,
signal,
);
});
const response = await refresh.promise;
serve(
res,
upstream.status,
body,
'MISS',
_cooldownUntil > Date.now()
? {
'Retry-After': String(
Math.ceil((_cooldownUntil - Date.now()) / 1000),
),
}
: {},
response.status,
response.body,
response.cacheStatus,
response.extra,
);
} catch (e) {
console.error('[adsb.lol Proxy]', e.message);