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index.js
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index.js
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var assert = require('assert');
var defaults = require('levelup-defaults');
var bytewise = require('bytewise');
var type = require('component-type');
var after = require('after');
var streamToArray = require('stream-to-array');
module.exports = Pathwise;
function Pathwise(db){
assert(db, 'db required');
this._db = defaults(db, {
keyEncoding: bytewise,
valueEncoding: 'json'
});
}
Pathwise.prototype.put = function(path, obj, opts, fn){
if (typeof opts == 'function') {
fn = opts;
opts = {};
}
if (!opts) {
opts = {};
}
if (!fn) {
fn = () => {};
}
var batch = opts.batch || this._db.batch();
this._write(batch, path, obj, fn);
if (opts.batch) setImmediate(fn);
else batch.write(fn);
};
Pathwise.prototype._write = function(batch, key, obj, fn){
var self = this;
switch(type(obj)) {
case 'object':
var keys = Object.keys(obj);
var next = after(keys.length, fn);
keys.forEach(function(k){
self._write(batch, key.concat(k), obj[k], next);
});
break;
case 'array':
this._write(batch, key, arrToObj(obj), fn);
break;
default:
batch.put(bytewise.encode(key), JSON.stringify(obj));
break;
}
};
Pathwise.prototype.batch = function(ops, fn) {
var self = this;
var batch = this._db.batch();
var next = after(ops.length, function(err){
if (err) return fn(err);
batch.write(fn);
});
ops.forEach(function(op){
if (op.type == 'put') self.put(op.path, op.data, { batch: batch }, next);
else if (op.type == 'del') self.del(op.path, { batch: batch }, next);
});
};
Pathwise.prototype.get = function(path, fn){
var ret = {};
var el = ret;
streamToArray(this._db.createReadStream({
start: path,
end: path.concat(undefined)
}), function(err, data){
if (err) return fn(err);
data.forEach(function(kv){
var segs = kv.key.slice(path.length);
if (segs.length) {
segs.forEach(function(seg, idx){
if (!el[seg]) {
if (idx == segs.length - 1) {
el[seg] = kv.value;
} else {
el[seg] = {};
}
}
el = el[seg];
});
el = ret;
} else {
ret = kv.value;
}
});
fn(null, ret);
});
};
Pathwise.prototype.del = function(path, opts, fn){
if (typeof opts == 'function') {
fn = opts;
opts = {};
}
var batch = opts.batch || this._db.batch();
streamToArray(this._db.createKeyStream({
start: path,
end: path.concat(undefined)
}), function(err, keys){
if (err) return fn(err);
keys.forEach(function(key){ batch.del(bytewise.encode(key)) });
if (opts.batch) fn();
else batch.write(fn);
});
};
Pathwise.prototype.children = function(path, fn) {
streamToArray(this._db.createReadStream({
start: path,
end: path.concat(undefined)
}), function(err, kv){
if (err) return fn(err);
fn(null, kv.map(function(_kv){
return _kv.key[path.length] || _kv.value;
}));
});
}
function arrToObj(arr){
var obj = {};
arr.forEach(function(el, idx){
obj[idx] = el;
});
return obj;
}