Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Update FsProvider #310

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Update FsProvider #310

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
147 changes: 89 additions & 58 deletions lib/fs.provider.js
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,148 +1,179 @@
'use strict';

const fs = require('fs');
const mkdirp = require('mkdirp');
const common = require('@metarhia/common');
const { FileStorage } = require('@metarhia/filestorage');
const metasync = require('metasync');
const mdsf = require('mdsf');

const { StorageProvider } = require('./provider');
const { FsCursor } = require('./fs.cursor');

const readStat = Symbol('readStat');
const writeStat = Symbol('writeStat');

const THROTTLE_TIMEOUT = 5000;

class FsProvider extends StorageProvider {
constructor(
options // { path } where path is database location
) {
// Create FsProvider
// options <Object>
constructor(options) {
super(options);
this.stat = null;
this.storage = null;
this.dbOptions = {};
}

readStat(callback) {
fs.readFile(this.path + '/.gs', (err, stat) => {
// Read storage stats
// callback - <Function>
// err - <Error>
// data - <Object>, database stats
[readStat](callback) {
fs.readFile(this.path + '/.gs', 'utf8', (err, stat) => {
if (err) {
callback(err);
callback(err, this);
return;
}
const data = mdsf.parse(stat.toString());
const data = mdsf.parse(stat);
data.count = data.count || 0;
data.size = data.size || 0;
data.next = data.next || 1;
callback(null, data);
});
}

open(options, callback) {
// Write storage stats
// callback - <Function>
// err - <Error>
[writeStat](callback) {
callback = common.once(callback);
const save = () => {
const data = mdsf.stringify(this.stat);
fs.writeFile(this.path + '/.gs', data, callback);
};
this.save = this.save || metasync.throttle(THROTTLE_TIMEOUT, save);
this.save();
}

// Open FsProvider
// options - <Object>
// path - <string>
// minCompressSize - <number>
// checksum - <string>, checksum type
// dedupHash - <string>, second checksum type
// callback - <Function>
// err - <Error>
open(options, callback) {
this.path = options.path;
this.dbOptions.checksum = options.checksum;
this.dbOptions.dedupHash = options.dedupHash;
super.open(options, () => {
this.readStat((err, stat) => {
this[readStat]((err, stat) => {
if (err) {
callback(new Error('Can not open database: ' + this.path));
} else {
this.stat = stat;
this.active = true;
callback();
return;
}
this.stat = stat;
this.active = true;
this.storage = new FileStorage(
Object.assign({ dir: options.path }, options)
);
callback(null, this);
});
});
}

writeStat(callback) {
callback = common.once(callback);
const save = () => {
const data = mdsf.stringify(this.stat);
fs.writeFile(this.path + '/.gs', data, callback);
};
this.save = this.save || metasync.throttle(THROTTLE_TIMEOUT, save);
this.save();
}

// Close FsProvider
// callback - <Function>
close(callback) {
callback = common.once(callback);
this.writeStat();
this[writeStat]();
this.active = false;
callback();
}

// Generate unique id
// callback - <Function>
// err - <Error>
// id - <number>
takeId(callback) {
callback = common.once(callback);
callback(null, this.stat.next++);
this.stat.count++;
this.writeStat();
this[writeStat]();
}

// Get record from GlobalStorage
// id - <number>
// callback - <Function>
// err - <Error>
// data - <Object>
get(id, callback) {
callback = common.once(callback);
const path = common.idToPath(id);
fs.readFile(path, (err, data) => {
this.storage.read(id, this.dbOptions, (err, data) => {
if (err) callback(err);
else callback(null, mdsf.parse(data.toString()));
});
}

// Create record in GlobalStorage
// obj - <Object>
// callback - <Function>
// err - <Error>
// id - <number>
create(obj, callback) {
callback = common.once(callback);
this.takeId((err, id) => {
if (err) {
callback(err);
return;
}
obj.Id = id;
const data = mdsf.stringify(obj);
this.stat.size += data.length;
this.writeStat();
const place = common.idToChunks(obj.Id);
place.path = this.path + place.path;
mkdirp(place.path, err => {
this.storage.write(id, data, this.dbOptions, (err, stats) => {
if (err) {
callback(err);
return;
}
const pp = place.path + '/' + place.name;
fs.writeFile(pp, data, err => {
if (err) callback(err);
else callback(null, id);
});
this.stat.size += stats.size;
this[writeStat]();
callback(null, id);
});
});
}

// Update record in GlobalStorage
// obj - <Object>
// Id - <number>
// callback - <Function>
// err - <Error>
update(obj, callback) {
callback = common.once(callback);
const path = common.idToPath(obj.Id);
fs.stat(path, (err, stat) => {
const data = mdsf.stringify(obj);
this.storage.update(obj.Id, data, this.dbOptions, (err, stats) => {
if (err) {
callback(err);
return;
}
const data = mdsf.stringify(obj);
this.stat.size += data.length - stat.size;
this.writeStat();
fs.writeFile(path, data, err => {
if (err) callback(err);
else callback();
});
this.stat.size += stats.size - stats.originalSize;
this[writeStat]();
callback();
});
}

// Delete record from GlobalStorage
// id - <number>
// callback - <Function>
// err - <Error>
delete(id, callback) {
callback = common.once(callback);
const path = common.idToPath(id);
fs.stat(path, (err, stat) => {
this.storage.stat(id, (err, stats) => {
if (err) {
callback(err);
return;
}
fs.unlink(path, err => {
this.storage.rm(id, err => {
if (err) {
callback(err);
return;
}
this.stat.count--;
this.stat.size -= stat.size;
this.writeStat();
this.stat.size -= stats.size;
this[writeStat]();
callback();
});
});
Expand Down
Loading