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couch.js
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couch.js
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var _ = require('underscore'),
fs = require('fs'),
request = require('request');
Couch = module.exports = function(config) {
var host = config.host || '127.0.0.1';
var port = config.port || '5984';
if (!config.name) throw 'Database name is required';
this.uri = 'http://' +
host + ':' +
port + '/' +
config.name;
this.name = config.name;
};
// General response parser
// -----------------------
Couch.prototype.parse = function(callback) {
var that = this;
return function(err, res, body) {
body = body ? JSON.parse(body) : {};
if (!err) {
if (body.error) {
err = new Error(body.reason);
err.error = body.error;
err.reason = body.reason;
err.statusCode = res.statusCode;
} else if (res.headers['etag']) {
body._rev = res.headers['etag'].slice(1, -1);
}
}
callback && callback(err, body);
}
};
// PUT a document to Couch
// -----------------------
Couch.prototype.put = function(doc, callback) {
request.put({
uri: this.uri + '/' + encodeURIComponent(doc._id),
json: doc
}, this.parse(callback));
};
// POST a document to Couch
// ------------------------
Couch.prototype.post = function(doc, callback) {
request.post({
uri: this.uri,
json: doc
}, this.parse(callback));
};
// DELETE a document from Couch
// ----------------------------
Couch.prototype.del = function(doc, callback) {
request.del({
uri: this.uri + '/' + encodeURIComponent(doc._id) + '?rev=' + doc._rev
}, this.parse(callback));
};
// GET a document from Couch
// -------------------------
Couch.prototype.get = function(id, callback) {
request.get({
uri: this.uri + '/' + encodeURIComponent(id)
}, this.parse(callback));
};
// HEAD request to retrieve document _rev.
// ---------------------------------------
Couch.prototype.head = function(id, callback) {
request.head({
uri: this.uri + '/' + encodeURIComponent(id)
}, this.parse(function(err, body) {
body && !err && (body._id = id);
callback(err, body);
}));
};
// GET documents via view from Couch
// ---------------------------------
Couch.prototype.view = function(view, options, callback) {
var opts = [];
_.each(options, function(v, k) {
opts.push(encodeURIComponent(k) + '=' + encodeURIComponent(v));
});
request.get({
uri: this.uri + '/' + view + '/?' + opts.join('&')
}, this.parse(callback));
};
// Create database
// ---------------
Couch.prototype.dbPut = function(callback) {
request.put({
uri: this.uri
}, this.parse(callback));
};
// Delete database
// ---------------
Couch.prototype.dbDel = function(callback) {
request.del({
uri: this.uri
}, this.parse(callback));
};
// PUT design docs from files or JSON objects
// ------------------------------------------
Couch.prototype.putDesignDocs = function(files, callback) {
callback = callback || function() {};
var remaining = files.length;
var put = function(id, doc) {
if (!id) return callback(new Error('Document _id required.'));
doc = _(doc).isString() ? doc : JSON.stringify(doc);
request.put({
uri: this.uri + '/' + id,
body: doc
}, function(err, res) {
remaining--;
if (err) return callback(err);
if (!remaining) return callback(err, res);
});
}.bind(this);
files.forEach(function(file) {
if (_(file).isString()) {
fs.readFile(file, 'utf8', function(err, data) {
if (err) return callback(err);
var id = data.match(/.*"_id".*?:.*?"(.*?)".*/)[1];
put(id, data);
});
} else {
put(file._id, file);
}
}.bind(this));
};