kopia lustrzana https://gitlab.com/rysiekpl/libresilient
79 wiersze
2.7 KiB
JavaScript
79 wiersze
2.7 KiB
JavaScript
/* ========================================================================= *\
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|* === Regular HTTP(S) fetch() plugin === *|
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\* ========================================================================= */
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/**
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* this plugin does not implement any push method
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*/
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// no polluting of the global namespace please
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(function () {
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/*
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* plugin config settings
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*/
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// sane defaults
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let defaultConfig = {
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// name of this plugin
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// should not be changed
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name: "fetch"
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}
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// merge the defaults with settings from LibResilientConfig
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let config = {...defaultConfig, ...self.LibResilientConfig.plugins[defaultConfig.name]}
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/**
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* getting content using regular HTTP(S) fetch()
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*/
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let fetchContent = (url) => {
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self.log(config.name, `regular fetch: ${url}`)
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return fetch(url, {cache: "reload"})
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.then((response) => {
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// 4xx? 5xx? that's a paddlin'
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if (response.status >= 400) {
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// throw an Error to fall back to LibResilient:
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throw new Error('HTTP Error: ' + response.status + ' ' + response.statusText);
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}
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// all good, it seems
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self.log(config.name, `fetched successfully: ${response.url}`);
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// we need to create a new Response object
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// with all the headers added explicitly,
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// since response.headers is immutable
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var init = {
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status: response.status,
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statusText: response.statusText,
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headers: {}
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};
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response.headers.forEach(function(val, header){
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init.headers[header] = val;
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});
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// add the X-LibResilient-* headers to the mix
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init.headers['X-LibResilient-Method'] = config.name
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init.headers['X-LibResilient-ETag'] = response.headers.get('ETag')
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// return the new response, using the Blob from the original one
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return response
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.blob()
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.then((blob) => {
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return new Response(
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blob,
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init
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)
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})
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})
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}
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// and add ourselves to it
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// with some additional metadata
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self.LibResilientPlugins.push({
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name: config.name,
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description: 'Just a regular HTTP(S) fetch()',
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version: 'COMMIT_UNKNOWN',
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fetch: fetchContent
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})
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// done with not poluting the global namespace
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})()
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