/
TemplateHelper.js
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/
TemplateHelper.js
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const request = require('request');
const fs = require('fs-extra');
const ApiStatusCodes = require('../api/ApiStatusCodes');
const Logger = require('../utils/Logger');
const CaptainConstants = require('../utils/CaptainConstants');
function getTagsForImage(imageBaseName, url, allTags) {
if (!url) {
url = 'https://hub.docker.com/v2/repositories/' + imageBaseName + '/tags';
}
return new Promise(function (resolve, reject) {
request(url,
function (error, response, body) {
if (error || !body) {
Logger.e(error);
reject(error);
return;
}
try {
// Sometimes Docker server is down and it crashes Captain!
body = JSON.parse(body);
} catch (e) {
Logger.e(e);
}
let results = null;
if (body) {
results = body.results;
}
if (!results) {
Logger.e('NO RESULT');
reject(new Error('NO RESULT'));
return;
}
if (!allTags) {
allTags = [];
}
for (let idx = 0; idx < results.length; idx++) {
allTags.push(results[idx].name);
}
if (body.next) {
resolve(getTagsForImage(imageBaseName, body.next, allTags));
return;
}
resolve(allTags);
});
});
}
function firstEndsWithSecond(str1, str2) {
if (!str1 || !str2) {
throw new Error('Str1 or Str2 are null ' + !str1 + ' ' + !str2)
}
let idx = str1.indexOf(str2);
return idx >= 0 && (idx + str2.length) === str1.length;
}
function isEmpty(obj) {
for (let key in obj) {
if (obj.hasOwnProperty(key)) {
return false;
}
}
return true;
}
class TemplateHelper {
constructor() {
const templates = [
{
templateName: 'node',
dockerHubImageName: 'library/node',
dockerFileFromName: 'node',
displayName: 'NodeJS',
tagSuffix: '-alpine'
},
{
templateName: 'php',
dockerHubImageName: 'library/php',
dockerFileFromName: 'php',
displayName: 'PHP',
tagSuffix: '-apache'
},
{
templateName: 'python-django',
dockerHubImageName: 'library/python',
dockerFileFromName: 'python-django',
displayName: 'Python Django',
tagSuffix: '-alpine3.6'
},
{
templateName: 'ruby-rack',
dockerHubImageName: 'library/ruby',
dockerFileFromName: 'ruby-rack',
displayName: 'Ruby Rack',
tagSuffix: '-alpine3.7'
}
];
const dockerfilesRoot = __dirname + '/../dockerfiles/';
for (let i = 0; i < templates.length; i++) {
templates[i].postFromLines = fs.readFileSync(dockerfilesRoot + templates[i].templateName, 'utf8');
}
this.templates = templates;
this.cachedImageTags = {};
if (CaptainConstants.isDebug) {
this.printAvailableImageTagsForReadme();
}
}
getDockerVersionsForTemplateName(templateName) {
const self = this;
let templateObj = self.getTemplateFromTemplateName(templateName);
if (isEmpty(this.cachedImageTags)) {
throw ApiStatusCodes.createError(ApiStatusCodes.STATUS_ERROR_GENERIC, 'Please wait about 30 seconds, then try again.');
}
let tags = self.cachedImageTags[templateObj.dockerHubImageName];
let dockerVersions = [];
for (let i = 0; i < tags.length; i++) {
let t = tags[i];
if (firstEndsWithSecond(t, templateObj.tagSuffix)) {
dockerVersions.push(t.substring(0, t.length - templateObj.tagSuffix.length));
}
}
return dockerVersions;
}
printAvailableImageTagsForReadme() {
const self = this;
self.cachedImageTags = {};
let tempCache = {};
for (let i = 0; i < self.templates.length; i++) {
const currentImageName = self.templates[i].dockerHubImageName;
getTagsForImage(currentImageName)
.then(function (tags) {
tempCache[currentImageName] = tags;
let isAllDone = true;
for (let j = 0; j < self.templates.length; j++) {
let imageName = self.templates[j].dockerHubImageName;
if (!tempCache[imageName]) {
isAllDone = false;
}
}
if (isAllDone) {
Logger.d('Template Cache Updated!');
self.cachedImageTags = tempCache;
// Used for README
for (let tempIdx = 0; tempIdx < self.templates.length; tempIdx++) {
Logger.d(' ');
Logger.d(self.templates[tempIdx].templateName + '/');
Logger.d(self.getDockerVersionsForTemplateName(self.templates[tempIdx].templateName).join(', '));
Logger.d(' ');
}
}
})
.catch(function (error) {
Logger.e(error);
});
}
}
getTemplateFromTemplateName(templateName) {
for (let i = 0; i < this.templates.length; i++) {
if (this.templates[i].templateName === templateName) {
return this.templates[i];
}
}
throw ApiStatusCodes.createError(ApiStatusCodes.STATUS_ERROR_GENERIC, 'TEMPLATE NAME NOT FOUND: ' + templateName);
}
getDockerfileContentFromTemplateTag(templateAndVersion) {
const self = this;
let templateName = templateAndVersion.split('/')[0];
let templateVersion = templateAndVersion.split('/')[1];
if (!templateVersion) {
throw ApiStatusCodes.createError(ApiStatusCodes.STATUS_ERROR_GENERIC,
'Template version field is empty!');
}
let templateObj = self.getTemplateFromTemplateName(templateName);
const fromLine = templateObj.dockerHubImageName + ':' + templateVersion + templateObj.tagSuffix;
return 'FROM ' + fromLine + '\n' + templateObj.postFromLines;
}
}
const templateHelperInstance = new TemplateHelper();
module.exports = {
get: function () {
return templateHelperInstance;
}
};