34 lines
975 B
JavaScript
34 lines
975 B
JavaScript
const fs = require('fs');
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const timeoutErrorVectorTile = fs.readFileSync(__dirname + '/../../../assets/render-timeout-fallback.mvt');
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module.exports = function vectorError() {
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return function vectorErrorMiddleware(err, req, res, next) {
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if(req.params.format === 'mvt') {
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if (isTimeoutError(err) || isRateLimitError(err)) {
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res.set('Content-Type', 'application/x-protobuf');
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return res.status(429).send(timeoutErrorVectorTile);
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}
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}
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next(err);
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};
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};
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function isRenderTimeoutError (err) {
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return err.message === 'Render timed out';
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}
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function isDatasourceTimeoutError (err) {
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return err.message && err.message.match(/canceling statement due to statement timeout/i);
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}
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function isTimeoutError (err) {
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return isRenderTimeoutError(err) || isDatasourceTimeoutError(err);
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}
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function isRateLimitError (err) {
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return err.type === 'limit' && err.subtype === 'rate-limit';
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}
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