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nano.js
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nano.js
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/* Minimal Couch In Node
*
* Copyright 2011 Nuno Job <nunojob.com> (oO)--',--
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
var request = require('request')
, fs = require('fs')
, qs = require('querystring')
, _ = require('underscore')
, error = require('./error')
, headers = { "content-type": "application/json" }
, nano;
/*
* Nano is a library that helps you building requests on top of mikeals/request
* No more, no less.
*
*
* - As simple as possible, but no simpler than that
* - It is not an ORM for CouchDB
* - It is not all fancy and RoR like
* - It is not meant to prevent you from doing stupid things.
* Be creative. Be silly. Do stupid things. I won't thow exceptions back at you.
*
* Have fun! Relax, and don't forget to compact.
* Dinosaurs spaceships ftw!
*/
module.exports = exports = nano = function database_module(cfg) {
var public_functions = {};
if(typeof cfg === "string") {
cfg = require(cfg); // No CFG? Maybe it's a file path?
}
if(cfg.proxy) { // Proxy support
request = request.defaults({proxy: cfg.proxy});
}
/****************************************************************************
* aux *
****************************************************************************/
/*
* Request DB
*
* An auxiliary function to do the request to CouchDB
*
* Important Announcement: _airplane_voice_
* This function is public but does not try to prevent you from shooting
* yourself in the foot. Use only if you know _exactly_ what you are trying
* to do. Plus if you are using it directly and it's not part of the interface
* please consider emailing me about that, or telling me what it is, or
* doing a pull request!
*
* @error {request:socket} There was a problem connecting to CouchDB
* @error {couch:*} Any error that CouchDB returns when creating a DB
*
* @param {opts:object} The request options; e.g. {db: "test", method: "GET"}
* {opts.db:string} The database name
* {opts.method:string} The http Method
* {opts.doc:string:optional} The document name
* {opts.att:string:optional} The attachment name
* {opts.content_type:string:optional} The content type, else json will be used
* {opts.body:object|string|binary:optional} The JSON body
* @param {callback:function:optional} The function to callback
*
* @return Execution of the code in your callback. Hopefully you are handling
*/
function relax(opts,callback) {
var url = cfg.database(opts.db)
, req = { method: opts.method, headers: headers }
, params = opts.params
, status_code
, parsed
, rh;
if(!callback) { callback = function () { return; }; } // Void Callback
if(opts.doc) {
url += "/" + opts.doc; // Add the document to the URL
if(opts.att) { url += "/" + opts.att; } // Add the attachment to the URL
}
if(opts.content_type) { req.headers["content-type"] = opts.content_type; }
if(opts.body) {
if (Buffer.isBuffer(opts.body)) {
req.body = opts.body; // Raw data
}
else { req.body = JSON.stringify(opts.body); } // JSON
}
req.uri = url + (_.isEmpty(params) ? "" : "?" + qs.stringify(params));
request(req, function(e,h,b){
if(e) {
callback(error.request_err(e,"socket",req,status_code),{},b);
return;
}
rh = h.headers;
status_code = h.statusCode;
// Most likely its JSON but sometimes we get a binary attachment
try { parsed = JSON.parse(b); } catch (err) { parsed = b; }
if (status_code === 200 || status_code === 201 || status_code === 202) {
callback(null,rh,parsed);
}
else { // Proxy the error
callback(error.couch_err(parsed.reason,parsed.error,req,status_code),rh,parsed);
}
});
}
/****************************************************************************
* db *
****************************************************************************/
/*
* Creates a CouchDB Database
* http://wiki.apache.org/couchdb/HTTP_database_API
*
* e.g. function recursive_retries_create_db(tried,callback) {
* nano.db.create(db_name, function (e,b) {
* if(tried.tried === tried.max_retries) {
* callback("Retries work");
* return;
* }
* else {
* tried.tried += 1;
* recursive_retries_create_db(tried,callback);
* }
* });
* }
*
* @param {db_name:string} The name of the database
*
* @see relax
*/
function create_db(db_name, callback) {
relax({db: db_name, method: "PUT"},callback);
}
/*
* Annihilates a CouchDB Database
*
* e.g. nano.db.delete(db_name);
*
* Even though this looks sync it is an async function
* and therefor order is not guaranteed
*
* @param {db_name:string} The name of the database
*
* @see relax
*/
function destroy_db(db_name, callback) {
relax({db: db_name, method: "DELETE"},callback);
}
/*
* Gets information about a CouchDB Database
*
* e.g. nano.db.get(db_name, function(e,b) {
* console.log(b);
* });
*
* @param {db_name:string} The name of the database
*
* @see relax
*/
function get_db(db_name, callback) {
relax({db: db_name, method: "GET"},callback);
}
/*
* Lists all the databases in CouchDB
*
* e.g. nano.db.list(function(e,b) {
* console.log(b);
* });
*
* @see relax
*/
function list_dbs(callback) {
relax({db: "_all_dbs", method: "GET"},callback);
}
/*
* Compacts a CouchDB Database
*
* e.g. nano.db.compact(db_name);
*
* @param {db_name:string} The name of the database
* @param {design_name:string:optional} The name of the design document
*
* @see relax
*/
function compact_db(db_name, design_name, callback) {
if(typeof design_name === "function") {
callback = design_name;
design_name = null;
}
relax({db: db_name, doc: "_compact", att: design_name, method: "POST"},callback);
}
/*
* CouchDB Database _changes feed
*
* e.g. nano.db.changes(db_name, {since: 2}, function (e,h,r) {
* console.log(r);
* });
*
* @param {db_name:string} The name of the database
* @param {params:object:optional} Additions to the querystring
*
* @see relax
*/
function changes_db(db_name, params, callback) {
if(typeof params === "function") {
callback = params;
params = {};
}
relax({db: db_name, doc: "_changes", params: params, method: "GET"},callback);
}
/*
* Replicates a CouchDB Database
*
* e.g. nano.db.replicate(db_1, db_2);
*
* @param {source:string} The name of the source database
* @param {target:string} The name of the target database
* @param {continuous:bool:optional} Turn on continuous replication
*
* @see relax
*/
function replicate_db(source, target, continuous, callback) {
if(typeof continuous === "function") {
callback = continuous;
continuous = false;
}
var body = {source: source, target: target};
if(continuous) { body.continuous = true; }
relax({db: "_replicate", body: body, method: "POST"},callback);
}
/*
* Returns the CouchDB + Nano Configuration
*
* @see relax
*/
function config(callback) {
relax({db: "_config", method: "GET"}, function (e,h,r) {
if(e) { callback(e); }
callback(null,h,{nano: cfg, couch: r});
});
}
/****************************************************************************
* doc *
****************************************************************************/
function document_module(db_name) {
var public_functions = {};
/*
* Inserts a document in a CouchDB Database
* http://wiki.apache.org/couchdb/HTTP_Document_API
*
* @param {doc:object|string} The document
* @param {doc_name:string:optional} The name of the document
*
* @see relax
*/
function insert_doc(doc,doc_name,callback) {
var opts = {db: db_name, body: doc, method: "POST"};
if(doc_name) {
if(typeof doc_name === "function") {
callback = doc_name;
}
else {
opts.doc = doc_name;
opts.method = "PUT";
}
}
relax(opts,callback);
}
/*
* Updates a document in a CouchDB Database
*
*
* @param {doc_name:string} The name of the document
* @param {rev:string} The previous document revision
* @param {doc:object|string} The document
*
* @see relax
*/
function update_doc(doc_name,rev,doc,callback) {
doc._rev = rev;
relax({ db: db_name, doc: doc_name, method: "PUT", body: doc},callback);
}
/*
* Destroy a document from CouchDB Database
*
* @param {doc_name:string} The name of the document
* @param {rev:string} The previous document revision
*
* @see relax
*/
function destroy_doc(doc_name,rev,callback) {
relax({db: db_name, doc: doc_name, method: "DELETE", params: {rev: rev}},
callback);
}
/*
* Get's a document from a CouchDB Database
*
* e.g. db2.get("foo", {revs_info: true}, function (e,h,b) {
* console.log(e,h,b);
* return;
* });
*
* @param {doc_name:string} The name of the document
* @param {params:object:optional} Additions to the querystring
*
* @see relax
*/
function get_doc(doc_name,params,callback) {
if(typeof params === "function") {
callback = params;
params = {};
}
relax({db: db_name, doc: doc_name, method: "GET", params: params},callback);
}
/*
* Lists all the documents in a CouchDB Database
*
* @param {params:object:optional} Additions to the querystring
*
* @see get_doc
* @see relax
*/
function list_docs(params,callback) {
if(typeof params === "function") {
callback = params;
params = {};
}
relax({db: db_name, doc: "_all_docs", method: "GET", params: params},callback);
}
/*
* Bulk update/delete/insert functionality
* http://wiki.apache.org/couchdb/HTTP_Bulk_Document_API
*
* @param {docs:object} The documents as per the CouchDB API (check link)
*
* @see get_doc
* @see relax
*/
function bulk_docs(docs,callback) {
relax({db: db_name, doc: "_bulk_docs", body: docs, method: "POST"},callback);
}
/**************************************************************************
* attachment *
**************************************************************************/
/*
* Inserting an attachment
* http://wiki.apache.org/couchdb/HTTP_Document_API
*
* e.g.
* db.attachment.insert("new", "att", buffer, "image/bmp", {rev: b.rev},
* function(_,_,response) {
* console.log(response);
* });
*
* Don't forget that params.rev is required in all cases except when
* creating a new document with a new attachment via this method
*
* @param {doc_name:string} The name of the document
* @param {att_name:string} The name of the attachment
* @param {att:buffer} The attachment data
* @param {content_type:string} The attachment content type
* @param {params:object:optional} Additions to the querystring
*
* @see relax
*/
function insert_att(doc_name,att_name,att,content_type,params,callback) {
if(typeof params === "function") {
callback = params;
params = {};
}
relax({ db: db_name, att: att_name, method: "PUT", content_type: content_type
, doc: doc_name, params: params, body: att},callback);
}
/*
* Get an attachment
*
* @param {doc_name:string} The name of the document
* @param {att_name:string} The name of the attachment
* @param {params:object:optional} Additions to the querystring
*
* @see relax
*/
function get_att(doc_name,att_name,params,callback) {
if(typeof params === "function") {
callback = params;
params = {};
}
relax({ db: db_name, att: att_name, method: "GET"
, doc: doc_name, params: params},callback);
}
/*
* Destroy an attachment
*
* @param {doc_name:string} The name of the document
* @param {att_name:string} The name of the attachment
* @param {rev:string} The document last revision
*
* @see relax
*/
function destroy_att(doc_name,att_name,rev,callback) {
relax({ db: db_name, att: att_name, method: "DELETE"
, doc: doc_name, params: {rev: rev}},callback);
}
public_functions = { info: function(cb) { get_db(db_name,cb); }
, replicate: function(target,continuous,cb) {
if(typeof continuous === "function") {
cb = continuous;
continuous = false;
}
replicate_db(db_name,target,continuous,cb);
}
, compact: function(cb) { compact_db(db_name,cb); }
, changes: function(params,cb) { changes_db(db_name,params,cb); }
, insert: insert_doc
, update: update_doc
, get: get_doc
, destroy: destroy_doc
, bulk: bulk_docs
, list: list_docs
, view: { compact: function(design_name,cb) {
compact_db(db_name,design_name,cb); } }
, attachment: { insert: insert_att
, get: get_att
, destroy: destroy_att
}
};
return public_functions;
}
public_functions = { db: { create: create_db
, get: get_db
, destroy: destroy_db
, list: list_dbs
, use: document_module // Alias
, scope: document_module // Alias
, compact: compact_db
, replicate: replicate_db
, changes: changes_db
}
, use: document_module
, scope: document_module // Alias
, request: relax
, config: config
, relax: relax // Alias
, dinosaur: relax // Alias
};
return public_functions;
};
/*
* And now an ASCII Dinosaur
* _
* / _) ROAR! I'm a vegan!
* .-^^^-/ /
* __/ /
* /__.|_|-|_|
*
* Thanks for visiting! Come Again!
*/
nano.version = JSON.parse(
fs.readFileSync(__dirname + "/package.json")).version;
nano.path = __dirname;