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textdb.js
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'use strict';
const Fs = require('fs');
const TextStreamReader = require('./textdb-stream');
const QueryBuilder = require('./textdb-builder').QueryBuilder;
const TextReader = require('./textdb-reader');
const DELIMITER = '|';
const JSONBOOL = '":true ';
const NEWLINE = '\n';
const REGBOOL = /":true/g; // for updates of boolean types
const REGDATE = /"\d{4}-\d{2}-\d{2}T[0-9.:]+Z"/g;
const REGTESCAPE = /\||\n|\r/g;
const REGTUNESCAPE = /%7C|%0D|%0A/g;
const REGTESCAPETEST = /\||\n|\r/;
const BOOLEAN = { '1': 1, 'true': 1, on: 1 };
const TABLERECORD = { '+': 1, '-': 1, '*': 1 };
const MAXREADERS = 3;
const JSONBUFFER = 40;
// For performing of cleaning
var INSTANCES = [];
// Temporary
var CACHEITEMS = {};
function TableDB(filename, schema, onetime) {
var t = this;
t.duration = [];
t.filename = filename;
t.filenamelog = filename + '.log';
t.filenamebackup = filename + '.bk';
if (!onetime) {
t.id = HASH(t.filename, true) + '';
CACHEITEMS[t.id] = [];
}
t.pending_drops = false;
t.pending_count = 0;
t.pending_reader = [];
t.pending_reader2 = [];
t.pending_update = [];
t.pending_append = [];
t.pending_remove = [];
t.pending_streamer = [];
t.pending_clean = [];
t.pending_clear = [];
t.pending_locks = [];
t.step = 0;
t.ready = false;
t.$writing = false;
t.$reading = 0;
t.$allocations = true;
t.total = 0;
t.next2 = () => t.next(0);
Fs.createReadStream(t.filename, { end: 2048 }).once('data', function(chunk) {
t.parseSchema(t, chunk.toString('utf8').split('\n', 1)[0].split(DELIMITER));
t.$header = Buffer.byteLength(t.stringifySchema(t)) + 1;
if (schema) {
t.alter(schema);
} else {
t.ready = true;
t.next(0);
}
}).on('error', function() {
schema && t.alter(schema);
});
}
function JsonDB(filename, onetime) {
var t = this;
t.filename = filename;
t.filenamelog = filename + '.log';
t.filenamebackup = filename + '.bk';
if (!onetime) {
t.id = HASH(t.filename, true) + '';
CACHEITEMS[t.id] = [];
}
t.duration = [];
t.pending_count = 0;
t.pending_update = [];
t.pending_append = [];
t.pending_reader = [];
t.pending_remove = [];
t.pending_reader2 = [];
t.pending_streamer = [];
t.pending_clean = [];
t.pending_clear = [];
t.pending_locks = [];
t.step = 0;
t.pending_drops = false;
t.$timeoutmeta;
t.$writing = false;
t.$reading = 0;
t.total = 0;
t.inmemory = false;
t.next2 = () => t.next(0);
}
const TD = TableDB.prototype;
const JD = JsonDB.prototype;
TD.memory = JD.memory = function(count, size) {
var self = this;
count && (self.buffercount = count + 1); // def: 15 - count of stored documents in memory while reading/writing
size && (self.buffersize = size * 1024); // def: 32 - size of buffer in kB
return self;
};
function prepareschema(schema) {
return schema.replace(/;|,/g, DELIMITER).trim();
}
TD.alter = function(schema, callback) {
var self = this;
if (self.ready) {
self.alterlock(schema, callback);
return self;
}
var parsed = {};
if (self.$header) {
self.parseSchema(parsed, prepareschema(schema).split(DELIMITER));
if (self.stringifySchema(self) === self.stringifySchema(parsed))
callback && callback();
else
self.extend(schema, callback);
} else {
self.parseSchema(self, prepareschema(schema).split(DELIMITER));
var bschema = self.stringifySchema(self);
self.$header = Buffer.byteLength(bschema) + 1;
Fs.writeFileSync(self.filename, bschema + NEWLINE, 'utf8');
callback && callback();
}
self.ready = true;
self.next(0);
};
TD.alterlock = function(schema, callback) {
var self = this;
self.lock(function(unlock) {
self.ready = false;
self.alter(schema, function() {
callback && callback();
unlock();
});
});
};
function next_operation(self, type) {
self.next(type);
}
JD.insert = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_append.push(builder);
setImmediate(next_operation, self, 1);
return builder;
};
JD.update = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_update.push(builder);
setImmediate(next_operation, self, 2);
return builder;
};
TD.restore = JD.restore = function(filename, callback) {
var self = this;
U.wait(() => !self.type, function(err) {
if (err)
throw new Error('Database can\'t be restored because it\'s busy.');
self.type = 9;
// Restore
RESTORE(filename, self.directory, function(err, response) {
self.type = 0;
callback && callback(err, response);
});
});
return self;
};
TD.backup = JD.backup = function(filename, callback) {
var self = this;
var list = [];
var pending = [];
pending.push(function(next) {
PATH.exists(self.filename, function(e) {
e && list.push(self.filename);
next();
});
});
pending.push(function(next) {
PATH.exists(self.filenamelog, function(e) {
e && list.push(self.filenamelog);
next();
});
});
pending.push(function(next) {
PATH.exists(self.filenamebackup, function(e) {
e && list.push(self.filenamebackup);
next();
});
});
pending.async(function() {
if (list.length) {
// Total.js Backup
BACKUP(filename, list, callback);
} else
callback('No files for backing up.');
});
return self;
};
TD.backups = JD.backups = function(callback) {
var self = this;
var isTable = self instanceof TableDB;
if (!builder)
builder = new QueryBuilder(self);
if (isTable && !self.ready) {
setTimeout((self, callback) => self.backups(callback), 500, self, callback);
return builder;
}
var instance = new JsonDB(self.filename + '.bk', true);
var builder = instance.find2();
callback && builder.callback(callback);
return builder;
};
TD.release = JD.release = function() {
var self = this;
for (var key in F.databases) {
if (F.databases[key] === self)
delete F.databases[key];
}
delete CACHEITEMS[self.id];
return self;
};
TD.drop = JD.drop = function(callback) {
var self = this;
self.pending_drops = true;
setImmediate(next_operation, self, 7);
callback && callback({ success: true });
return self;
};
TD.clear = JD.clear = function(callback) {
var self = this;
self.pending_clear.push(callback || NOOP);
setImmediate(next_operation, self, 12);
return self;
};
TD.clean = JD.clean = function(callback) {
var self = this;
self.pending_clean.push(callback || NOOP);
setImmediate(next_operation, self, 13);
return self;
};
TD.lock = JD.lock = function(callback) {
var self = this;
self.pending_locks.push(callback || NOOP);
setImmediate(next_operation, self, 14);
return self;
};
JD.remove = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_remove.push(builder);
setImmediate(next_operation, self, 3);
return builder;
};
JD.find = function(builder) {
var self = this;
if (builder instanceof QueryBuilder)
builder.db = self;
else
builder = new QueryBuilder(self);
self.pending_reader.push(builder);
setImmediate(next_operation, self, 4);
return builder;
};
JD.find2 = function(builder) {
var self = this;
if (builder instanceof QueryBuilder)
builder.db = self;
else
builder = new QueryBuilder(self);
self.pending_reader2.push(builder);
setImmediate(next_operation, self, 11);
return builder;
};
JD.stream = function(fn, arg, callback) {
var self = this;
if (typeof(arg) === 'function') {
callback = arg;
arg = null;
}
self.pending_streamer.push({ fn: fn, callback: callback, arg: arg || {} });
setImmediate(next_operation, self, 10);
return self;
};
JD.recount = TD.recount = function() {
var self = this;
self.pending_count++;
setImmediate(next_operation, self, 5);
};
// 1 append
// 2 update
// 3 remove
// 4 reader
// 5 counting
// 7 drop
// 8 backup
// 9 restore
// 10 streamer
// 11 reader reverse
// 12 clear
// 13 clean
// 14 locks
const NEXTWAIT = { 7: true, 8: true, 9: true, 12: true, 13: true, 14: true };
JD.next = function(type) {
if (type && NEXTWAIT[this.step])
return;
if (!this.$writing && !this.$reading) {
if (this.step !== 12 && this.pending_clear.length) {
this.$clear();
return;
}
if (this.step !== 13 && this.pending_clean.length) {
this.$clean();
return;
}
if (this.step !== 7 && this.pending_drops) {
this.$drop();
return;
}
if (this.step !== 14 && this.pending_locks.length) {
this.$lock();
return;
}
if (this.step !== 5 && this.pending_count) {
this.$count();
return;
}
}
if (!this.$writing) {
if (this.step !== 1 && this.pending_append.length) {
this.$append();
return;
}
if (this.step !== 2 && !this.$writing && this.pending_update.length) {
this.$update();
return;
}
if (this.step !== 3 && !this.$writing && this.pending_remove.length) {
this.$remove();
return;
}
}
if (this.$reading < MAXREADERS) {
// if (this.step !== 4 && this.pending_reader.length) {
if (this.pending_reader.length) {
this.$reader();
return;
}
// if (this.step !== 11 && this.pending_reader2.length) {
if (this.pending_reader2.length) {
this.$reader2();
return;
}
// if (this.step !== 10 && this.pending_streamer.length) {
if (this.pending_streamer.length) {
this.$streamer();
return;
}
}
if (this.step !== type) {
this.step = 0;
setImmediate(next_operation, this, 0);
}
};
// ======================================================================
// FILE OPERATIONS
// ======================================================================
JD.$append = function() {
var self = this;
self.step = 1;
if (!self.pending_append.length) {
self.next(0);
return;
}
self.$writing = true;
self.pending_append.splice(0).limit(JSONBUFFER, function(items, next) {
var json = '';
var now = Date.now();
for (var i = 0; i < items.length; i++) {
var builder = items[i];
json += JSON.stringify(builder.payload) + NEWLINE;
if (self.id && self.inmemory && CACHEITEMS[self.id].length)
CACHEITEMS[self.id].push(builder.payload);
self.oninsert && self.oninsert(builder.payload);
}
Fs.appendFile(self.filename, json, function(err) {
err && F.error(err, 'NoSQL insert: ' + self.filename);
var diff = Date.now() - now;
if (self.duration.push({ type: 'insert', duration: diff }) > 20)
self.duration.shift();
for (var i = 0; i < items.length; i++) {
var builder = items[i];
builder.duration = diff;
builder.response = builder.counter = builder.count = 1;
builder.logrule && builder.logrule();
builder.done();
}
self.total += items.length;
next();
});
}, () => setImmediate(next_append, self));
};
function next_append(self) {
self.$writing = false;
self.next(0);
}
JD.$update = function() {
var self = this;
self.step = 2;
if (!self.pending_update.length) {
self.next(0);
return self;
}
self.$writing = true;
var filter = self.pending_update.splice(0);
var filters = TextReader.make();
var fs = new TextStreamReader(self.filename);
var change = false;
filters.type = 'update';
filters.db = self;
for (var i = 0; i < filter.length; i++)
filters.add(filter[i], true);
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
var update = function(docs, doc, dindex, f) {
try {
f.modifyrule(docs[dindex], f.modifyarg);
f.backuprule && f.backuprule(fs.docsbuffer[dindex].doc);
} catch (e) {
f.canceled = true;
f.error = e + '';
}
};
var updateflush = function(docs, doc, dindex) {
doc = docs[dindex];
var rec = fs.docsbuffer[dindex];
var upd = JSON.stringify(doc).replace(REGBOOL, JSONBOOL);
if (upd === rec.doc)
return;
!change && (change = true);
var was = true;
if (rec.doc.length === upd.length) {
var b = Buffer.byteLength(upd);
if (rec.length === b) {
fs.write(upd + NEWLINE, rec.position);
was = false;
}
}
if (was) {
var tmp = fs.remchar + rec.doc.substring(1) + NEWLINE;
fs.write(tmp, rec.position);
fs.write2(upd + NEWLINE);
}
self.onupdate && self.onupdate(doc);
};
fs.ondocuments = function() {
try {
var docs = (new Function('return [' + fs.docs.replace(REGDATE, 'new Date($&)') + ']'))();
filters.compare2(docs, update, updateflush);
} catch (e) {
F.error('TextDB("' + self.filename + '").update()', e);
return false;
}
};
fs.$callback = function() {
if (self.id && self.inmemory && CACHEITEMS[self.id].length)
CACHEITEMS[self.id] = [];
fs = null;
self.$writing = false;
self.next(0);
for (var i = 0; i < filters.builders.length; i++) {
var builder = filters.builders[i];
builder.logrule && builder.logrule();
builder.done();
}
if (filters.total > 0)
filters.db.total = filters.total;
};
fs.openupdate();
return self;
};
JD.$reader = function(items, reader) {
var self = this;
self.step = 4;
if (!self.pending_reader.length) {
self.next(0);
return self;
}
var filters = TextReader.make(self.pending_reader.splice(0));
filters.type = 'read';
filters.db = self;
filters.inmemory = false;
if (self.id && self.inmemory && CACHEITEMS[self.id].length) {
filters.inmemory = true;
filters.compare(CACHEITEMS[self.id]);
filters.done();
self.next(0);
return self;
}
var fs = new TextStreamReader(self.filename);
self.$reading++;
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
var memory = !filters.cancelable && self.inmemory ? [] : null;
fs.ondocuments = function() {
try {
var docs = (new Function('return [' + fs.docs.replace(REGDATE, 'new Date($&)') + ']'))();
if (memory) {
for (var i = 0; i < docs.length; i++)
memory.push(docs[i]);
}
return filters.compare(docs);
} catch (e) {
F.error('TextDB("' + self.filename + '").read()', e);
return false;
}
};
fs.$callback = function() {
if (self.id && memory)
CACHEITEMS[self.id] = memory;
self.filesize = fs.stats.size;
CONF.textdb_inmemory && self.$check();
self.$reading--;
filters.done();
fs = null;
self.next(0);
};
if (reader)
fs.openstream(reader);
else
fs.openread();
return self;
};
JD.$reader2 = function() {
var self = this;
self.step = 11;
if (!self.pending_reader2.length) {
self.next(0);
return self;
}
var filters = TextReader.make(self.pending_reader2.splice(0));
filters.type = 'readreverse';
filters.db = self;
filters.inmemory = false;
if (self.id && self.inmemory && CACHEITEMS[self.id].length) {
filters.inmemory = true;
filters.comparereverse(CACHEITEMS[self.id]);
filters.done();
self.next(0);
return self;
}
self.$reading++;
var fs = new TextStreamReader(self.filename);
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
fs.ondocuments = function() {
try {
var data = (new Function('return [' + fs.docs.replace(REGDATE, 'new Date($&)') + ']'))();
data.reverse();
return filters.compare(data);
} catch (e) {
F.error('TextDB("' + self.filename + '").read()', e);
return false;
}
};
fs.$callback = function() {
self.filesize = fs.stats.size;
CONF.textdb_inmemory && self.$check();
filters.done();
self.$reading--;
fs = null;
self.next(0);
};
fs.openreadreverse();
return self;
};
JD.$streamer = function() {
var self = this;
self.step = 10;
if (!self.pending_streamer.length) {
self.next(0);
return self;
}
self.$reading++;
var filter = self.pending_streamer.splice(0);
var length = filter.length;
var count = 0;
var fs = new TextStreamReader(self.filename);
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
fs.ondocuments = function() {
try {
var docs = (new Function('return [' + fs.docs.replace(REGDATE, 'new Date($&)') + ']'))();
for (var j = 0; j < docs.length; j++) {
var json = docs[j];
count++;
for (var i = 0; i < length; i++)
filter[i].fn(json, filter[i].arg, count);
}
} catch (e) {
F.error('TextDB("' + self.filename + '").stream()', e);
return false;
}
};
fs.$callback = function() {
for (var i = 0; i < length; i++)
filter[i].callback && filter[i].callback(null, filter[i].arg, count);
self.$reading--;
self.next(0);
fs = null;
};
fs.openread();
return self;
};
JD.$remove = function() {
var self = this;
self.step = 3;
if (!self.pending_remove.length) {
self.next(0);
return;
}
self.$writing = true;
var fs = new TextStreamReader(self.filename);
var filter = self.pending_remove.splice(0);
var filters = TextReader.make(filter);
var change = false;
filters.type = 'remove';
filters.db = self;
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
var remove = function(docs, d, dindex, f) {
filters.total--;
f.backuprule && f.backuprule(fs.docsbuffer[dindex].doc);
self.onremove && self.onremove(fs.docsbuffer[dindex].doc);
return 1;
};
var removeflush = function(docs, d, dindex) {
var rec = fs.docsbuffer[dindex];
!change && (change = true);
fs.write(fs.remchar + rec.doc.substring(1) + NEWLINE, rec.position);
};
fs.ondocuments = function() {
try {
var docs = (new Function('return [' + fs.docs.replace(REGDATE, 'new Date($&)') + ']'))();
filters.compare2(docs, remove, removeflush);
} catch (e) {
F.error('TextDB("' + self.filename + '").read()', e);
return false;
}
};
fs.$callback = function() {
if (self.id && self.inmemory && CACHEITEMS[self.id].length)
CACHEITEMS[self.id] = [];
filters.done();
fs = null;
self.$writing = false;
self.next(0);
};
fs.openupdate();
};
JD.$clear = function() {
var self = this;
self.step = 12;
if (!self.pending_clear.length) {
self.next(0);
return;
}
var filter = self.pending_clear.splice(0);
Fs.unlink(self.filename, function() {
self.total = 0;
for (var i = 0; i < filter.length; i++)
filter[i]();
if (self.id && self.inmemory && CACHEITEMS[self.id].length)
CACHEITEMS[self.id] = [];
self.total = 0;
self.filesize = 0;
self.next(0);
});
};
JD.$clean = function() {
var self = this;
self.step = 13;
if (!self.pending_clean.length) {
self.next(0);
return;
}
var filter = self.pending_clean.splice(0);
var length = filter.length;
var fs = new TextStreamReader(self.filename);
var writer = Fs.createWriteStream(self.filename + '-tmp');
if (self.buffersize)
fs.buffersize = self.buffersize;
if (self.buffercount)
fs.buffercount = self.buffercount;
fs.divider = NEWLINE;
fs.ondocuments = function() {
fs.docs && writer.write(fs.docs + NEWLINE);
};
fs.$callback = function() {
writer.end();
};
writer.on('finish', function() {
Fs.rename(self.filename + '-tmp', self.filename, function() {
for (var i = 0; i < length; i++)
filter[i]();
self.next(0);
fs = null;
});
});
fs.openread();
};
JD.$lock = function() {
var self = this;
self.step = 14;
if (!self.pending_locks.length) {
self.next(0);
return;
}
var filter = self.pending_locks.splice(0);
filter.wait(function(fn, next) {
fn.call(self, next);
}, () => self.next(0));
};
JD.$drop = TD.$drop = function() {
var self = this;
self.step = 7;
if (!self.pending_drops) {
self.next(0);
return;
}
self.pending_drops = false;
var remove = [self.filename, self.filenamebackup, self.filenamelog];
remove.wait((filename, next) => Fs.unlink(filename, next), function() {
if (self.id && self.inmemory && CACHEITEMS[self.id].length)
CACHEITEMS[self.id] = [];
self.total = 0;
self.filesize = 0;
self.next(0);
}, 5);
};
TD.insert = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_append.push(builder);
setImmediate(next_operation, self, 1);
return builder;
};
TD.update = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_update.push(builder);
setImmediate(next_operation, self, 2);
return builder;
};
TD.remove = function() {
var self = this;
var builder = new QueryBuilder(self);
self.pending_remove.push(builder);
setImmediate(next_operation, self, 3);
return builder;
};
TD.find = function(builder) {
var self = this;
if (builder)
builder.db = self;
else
builder = new QueryBuilder(self);
self.pending_reader.push(builder);
setImmediate(next_operation, self, 4);
return builder;
};
TD.find2 = function(builder) {
var self = this;
if (builder)
builder.db = self;
else
builder = new QueryBuilder(self);
self.pending_reader2.push(builder);
setImmediate(next_operation, self, 11);
return builder;
};