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Persistent Storage feature #145

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Persistent Storage feature #145

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21bc140
add message for persistent storage
cyril36 Nov 19, 2022
c2045b8
persistent storage
cyril36 Nov 20, 2022
5731f3b
add persitent storage
cyril36 Nov 21, 2022
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77 changes: 76 additions & 1 deletion bin/json-graphql-server.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,11 +4,18 @@ var path = require('path');
var express = require('express');
var cors = require('cors');
var JsonGraphqlServer = require('../lib/json-graphql-server.node.min').default;

var fs = require('fs');
var path = require('path');

var dataFilePath = process.argv.length > 2 ? process.argv[2] : './data.json';
var data = require(path.join(process.cwd(), dataFilePath));
var PORT = process.env.NODE_PORT || 3000;
var HOST = process.env.NODE_HOST || 'localhost';
var PERSISTENT = process.env.NODE_PERSISTENT || false;
var PERSITENT_DIR = process.env.NODE_PERSITENT_DIR || ".";
var KEEP_CHANGE_HISTORY = process.env.NODE_KEEP_CHANGE_HISTORY || false;
var VERBOSE = process.env.NODE_VERBOSE || false;

var app = express();

process.argv.forEach((arg, index) => {
Expand All @@ -20,15 +27,83 @@ process.argv.forEach((arg, index) => {
if (arg === '--h' && process.argv.length > index + 1) {
HOST = process.argv[index + 1];
}
if (arg === '--persistent-dir' && process.argv.length > index + 1) {
PERSITENT_DIR = process.argv[index + 1];
}
if (arg === '--persistent') {
PERSISTENT = true;
}
if (arg === '--keep-change-history') {
KEEP_CHANGE_HISTORY = true;
}
if (arg === '--verbose') {
VERBOSE = true;
}

});
app.use(function(req, res, next) {
if (VERBOSE == true){
console.log("before", data);
}
fs.readdir(".", (err, files) => {
files.forEach(file => {
console.log(file);
});
});
res.on("finish", function() {
if (VERBOSE == true){
console.log("after", data);
}
if (PERSISTENT == true){
var json = JSON.stringify(data);
if (VERBOSE == true){
console.log("File content will be :", json);
}

if(KEEP_CHANGE_HISTORY == true){
var destFile = dataFilePath.replace(/^.*[\\\/]/, '')
var timestamp = Date.now()
var destFilename = destFile.concat("-",timestamp)
var backupDirFilename = path.join(PERSITENT_DIR, destFilename);
console.log(backupDirFilename)
fs.copyFile(dataFilePath, backupDirFilename, (err) => {
if (err) {
console.error(err);
return;
};
console.log('File was copied to ' + backupDirFilename );

});
}

fs.writeFile(dataFilePath, json, 'utf8',
function(err) {
if (err) {
console.error(err);
return;
};
console.log("File " + dataFilePath + " has been updated");
}
);
}
});
next();
});

app.use(cors());
app.use('/', JsonGraphqlServer(data));
app.listen(PORT, HOST);
if (PERSISTENT==true){
console.log("Your data will be saved in " + dataFilePath)
}
if (KEEP_CHANGE_HISTORY==true){
console.log("Your data changes will be saved in " + PERSITENT_DIR)
}
var msg = `GraphQL server running with your data at http://${HOST}:${PORT}/`;
console.log(msg); // eslint-disable-line no-console

process.on('unhandledRejection', (reason, p) => {
// eslint-disable-next-line no-console
console.log('Unhandled Rejection at: Promise', p, 'reason:', reason);
});