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utils.js
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utils.js
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const fs = require('fs');
const chalk = require('chalk');
const fetch = require('node-fetch');
const { ResourceNotFoundError } = require('./exceptions');
const getGitHash = () => {
/* https://stackoverflow.com/questions/34518389/get-hash-of-most-recent-git-commit-in-node */
try {
const rev = fs.readFileSync('.git/HEAD').toString();
if (rev.indexOf(':') === -1) {
return rev;
}
return fs.readFileSync('.git/').toString() + rev.substring(5).replace(/\n/, '');
} catch (err) {
return "unknown";
}
};
const verbose = (msg, ...rest) => {
if (global.verbose) {
console.log(chalk.greenBright(`[verbose]\t${msg}`), ...rest);
}
};
const log = (msg, ...rest) => {
console.log(chalk.blueBright(msg), ...rest);
};
const warn = (msg, ...rest) => {
console.warn(chalk.redBright(`[warning]\t${msg}`), ...rest);
};
const error = (msg, ...rest) => {
console.error(chalk.redBright(`[error]\t${msg}`), ...rest);
process.exit(2);
};
const fetchJSON = (pathToFetch) => {
verbose(`Fetching ${pathToFetch}`);
const p = fetch(pathToFetch)
.then((res) => {
if (res.status === 404) throw new ResourceNotFoundError();
else if (res.status !== 200) throw new Error(res.statusText);
try {
const header = res.headers[Object.getOwnPropertySymbols(res.headers)[0]] || res.headers._headers;
verbose(`Got type ${header["content-type"]} with encoding ${header["content-encoding"] || "none"}`);
} catch (e) {
// potential errors here are inconsequential for the response
}
return res;
})
.then((res) => res.json());
return p;
};
const printStackTrace = (err) => {
if (err.stack) {
warn('Stacktrace:');
console.log('====================');
console.log(err.stack);
console.log('====================');
} else {
warn("No available stacktrace");
}
};
const responseDetails = async (response) => [
`${response.status} ${response.statusText}`,
await response.text()
];
/**
* Given a list of files, return a list of URL pathnames of
* datasets which can be fetched
* @param {Array} files. Array of strings.
* @returns {Array}
*/
const getDatasetsFromListOfFilenames = (filenames) => {
/* Please see https://github.com/nextstrain/nextstrain.org/pull/65 for comments
which indicate that this function "weirdly mixes a functional, stream-based
approach with a procedural approach" and is a candidate for refactoring.
James // Jan 2020 */
const jsonFiles = filenames
.filter((file) => file.endsWith(".json"));
// All JSON files which aren't a sidecar file with a known suffix are assumed to
// be v2+ JSONs (aka "unified" JSONs)
const sidecarSuffixes = ["meta", "tree", "root-sequence", "seq", "tip-frequencies"];
const datasets = jsonFiles
.filter((filename) => !sidecarSuffixes.some((suffix) => filename.endsWith(`_${suffix}.json`)))
.map((filename) => filename.replace(/[.]json$/, ""));
// All *_meta.json files which have a corresponding *_tree.json are assumed to
// be v1 JSONs.
jsonFiles
.filter((filename) => filename.endsWith("_meta.json"))
.filter((filename) => jsonFiles.includes(filename.replace(/_meta[.]json$/, "_tree.json")))
.map((filename) => filename.replace(/_meta[.]json$/, ""))
.filter((filename) => !datasets.includes(filename))
.forEach((filename) => datasets.push(filename));
// modify the filenames to represent URL pathnames not filenames
return datasets.map((filename) => filename
.split("_")
.join("/"));
};
const parseNarrativeLanguage = (narrative) => {
const urlParts = narrative.split("/");
let language = urlParts[urlParts.length - 2];
if (language === 'sit-rep') language = 'en';
return language;
};
module.exports = {
getGitHash,
verbose,
log,
warn,
error,
fetchJSON,
printStackTrace,
responseDetails,
getDatasetsFromListOfFilenames,
parseNarrativeLanguage
};