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json.js
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json.js
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// imports
var fs = require('fs');
var jsonfile = require('jsonfile');
// function fileExists
function fileExists(filePath) {
try {
return fs.statSync(filePath).isFile();
}
catch (err) {
return false;
}
}
// load file
var filename = 'data.json';
var allTweets = {};
if (fileExists(filename)) {
allTweets = jsonfile.readFileSync(filename);
} else {
allTweets = {
meta: {
max_id: Number.MAX_VALUE,
since_id: undefined,
topics_max_id: Number.MAX_VALUE,
topics_since_id: undefined
},
tweets: [],
topics: []
};
}
// static class definition
var jsonService = {
getTweetsMaxId: function () {
return Promise.resolve(allTweets.meta.max_id);
},
getTweetsSinceId: function () {
return Promise.resolve(allTweets.meta.since_id);
},
getTopicsMaxId: function () {
return Promise.resolve(allTweets.meta.topics_max_id);
},
getTopicsSinceId: function () {
return Promise.resolve(allTweets.meta.topics_since_id);
},
setTweetsMaxId: function (newValue) {
return new Promise((res) => {
allTweets.meta.max_id = newValue;
jsonfile.writeFileSync(filename, allTweets);
res(newValue);
});
},
setTweetsSinceId: function (newValue) {
return new Promise((res) => {
allTweets.meta.since_id = newValue;
jsonfile.writeFileSync(filename, allTweets);
res(newValue);
});
},
setTopicsMaxId: function (newValue) {
return new Promise((res) => {
allTweets.meta.topics_max_id = newValue;
jsonfile.writeFileSync(filename, allTweets);
res(newValue);
});
},
setTopicsSinceId: function (newValue) {
return new Promise((res) => {
allTweets.meta.topics_since_id = newValue;
jsonfile.writeFileSync(filename, allTweets);
res(newValue);
});
},
getTweets: function () {
return Promise.resolve(allTweets.tweets);
},
setTweets: function (newTweets) {
return new Promise((res) => {
allTweets.tweets = newTweets;
jsonfile.writeFileSync(filename, allTweets);
res(newTweets);
});
},
getTopics: function () {
return Promise.resolve(allTweets.topics);
},
setTopics: function (newTopics) {
return new Promise((res) => {
allTweets.topics = newTopics;
jsonfile.writeFileSync(filename, allTweets);
res(newTopics);
});
}
};
// export
module.exports = jsonService;