From 35088a33137c6f4433e1e648210816592afd1e32 Mon Sep 17 00:00:00 2001 From: Matt Hamann Date: Sat, 21 Oct 2017 16:42:24 -0400 Subject: [PATCH] Added nconf.any method (#278) * Added nconf.any method Fixes #126 Implemented on the Provider class Takes an array of keys, or a variable argument list Supports both callback and non-callback invocations * Use an explicit search base in file store test Fixes #224 Test file was created under process.env.HOME, but test was searching in the current working directory. If the cwd was not on the same drive as the home directory, the test would fail. * Added some API documentation to README for 'any' * Tweak `.any` documentation --- README.md | 18 + lib/nconf/provider.js | 57 ++ package-lock.json | 1326 ++++++++++++++++++++++++++++++++ test/nconf-test.js | 1 + test/provider-test.js | 69 ++ test/stores/file-store-test.js | 5 +- 6 files changed, 1474 insertions(+), 2 deletions(-) create mode 100644 package-lock.json diff --git a/README.md b/README.md index aaf63f1..d1ca8f3 100644 --- a/README.md +++ b/README.md @@ -129,6 +129,24 @@ Adds a new store with the specified `name` and `options`. If `options.type` is n nconf.add('global', { type: 'file', file: '/path/to/globalconf.json' }); ``` +### nconf.any(names, callback) +Given a set of key names, gets the value of the first key found to be truthy. The key names can be given as separate arguments +or as an array. If the last argument is a function, it will be called with the result; otherwise, the value is returned. + +``` js + // + // Get one of 'NODEJS_PORT' and 'PORT' as a return value + // + var port = nconf.any('NODEJS_PORT', 'PORT'); + + // + // Get one of 'NODEJS_IP' and 'IPADDRESS' using a callback + // + nconf.any(['NODEJS_IP', 'IPADDRESS'], function(err, value) { + console.log('Connect to IP address ' + value); + }); +``` + ### nconf.use(name, options) Similar to `nconf.add`, except that it can replace an existing store if new options are provided diff --git a/lib/nconf/provider.js b/lib/nconf/provider.js index 3f766e2..bb8d049 100644 --- a/lib/nconf/provider.js +++ b/lib/nconf/provider.js @@ -275,6 +275,63 @@ Provider.prototype.get = function (key, callback) { }); }; + +// +// ### function any (keys, callback) +// #### @keys {array|string...} Array of keys to query, or a variable list of strings +// #### @callback {function} **Optional** Continuation to respond to when complete. +// Retrieves the first truthy value (if any) for the specified list of keys. +// +Provider.prototype.any = function (keys, callback) { + + if (!Array.isArray(keys)) { + keys = Array.prototype.slice.call(arguments); + if (keys.length > 0 && typeof keys[keys.length - 1] === 'function') { + callback = keys.pop(); + } else { + callback = null; + } + } + + // + // If there is no callback, use the short-circuited "get" + // on each key in turn. + // + if (!callback) { + var val; + for (var i = 0; i < keys.length; ++i) { + val = this._execute('get', 1, keys[i], callback); + if (val) { + return val; + } + } + return null; + } + + var keyIndex = 0, + result, + self = this; + + async.whilst(function() { + return !result && keyIndex < keys.length; + }, function(next) { + var key = keys[keyIndex]; + keyIndex++; + + self.get(key, function(err, v) { + if (err) { + next(err); + } else { + result = v; + next(); + } + }); + }, function(err) { + return err ? callback(err) : callback(null, result); + }); +}; + + // // ### function set (key, value, callback) // #### @key {string} Key to set in this instance diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..abd7189 --- /dev/null +++ b/package-lock.json @@ -0,0 +1,1326 @@ +{ + "name": "nconf", + "version": "0.8.4", + "lockfileVersion": 1, + "requires": true, + "dependencies": { + "async": { + "version": "1.5.2", + "resolved": "https://registry.npmjs.org/async/-/async-1.5.2.tgz", + "integrity": "sha1-7GphrlZIDAw8skHJVhjiCJL5Zyo=" + }, + "asynckit": { + "version": "0.4.0", + "resolved": "https://registry.npmjs.org/asynckit/-/asynckit-0.4.0.tgz", + "integrity": "sha1-x57Zf380y48robyXkLzDZkdLS3k=", + "dev": true + }, + "aws4": { + "version": "1.6.0", + "resolved": "https://registry.npmjs.org/aws4/-/aws4-1.6.0.tgz", + "integrity": "sha1-g+9cqGCysy5KDe7e6MdxudtXRx4=", + "dev": true + }, + "bcrypt-pbkdf": { + "version": "1.0.1", + "resolved": "https://registry.npmjs.org/bcrypt-pbkdf/-/bcrypt-pbkdf-1.0.1.tgz", 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091101a..e063671 100644 --- a/test/provider-test.js +++ b/test/provider-test.js @@ -201,4 +201,73 @@ vows.describe('nconf/provider').addBatch({ } } } +}).addBatch({ + "When using nconf": { + "an instance of 'nconf.Provider'": { + "the any() method": { + topic: new nconf.Provider({ + type: 'literal', + store: { + key: "getThisValue" + } + }), + "without a callback": { + "given an array of keys with one matching": { + "should respond with the correct value": function (provider) { + assert.equal(provider.any(["notthis", "orthis", "key"]), 'getThisValue'); + } + }, + "given an array of keys with no match": { + "should respond with null": function (provider) { + assert.isNull(provider.any(["notthis", "orthis"])); + } + }, + "given a variable argument list of keys with one matching": { + "should respond with the correct value": function (provider) { + assert.equal(provider.any("notthis", "orthis", "key"), 'getThisValue'); + } + }, + "given no arguments": { + "should respond with null": function (provider) { + assert.isNull(provider.any()); + } + } + }, + "with a callback": { + "given an array of keys with one matching": { + topic: function(provider) { + provider.any(["notthis", "orthis", "key"], this.callback); + }, + "should respond with the correct value": function (err, value) { + assert.equal(value, 'getThisValue'); + } + }, + "given an array of keys with no match": { + topic: function(provider) { + provider.any(["notthis", "orthis"], this.callback); + }, + "should respond with an undefined value": function (err, value) { + assert.isUndefined(value); + } + }, + "given a variable argument list of keys with one matching": { + topic: function(provider) { + provider.any("notthis", "orthis", "key", this.callback); + }, + "should respond with the correct value": function (err, value) { + assert.equal(value, 'getThisValue'); + } + }, + "given no keys": { + topic: function(provider) { + provider.any(this.callback); + }, + "should respond with an undefined value": function (err, value) { + assert.isUndefined(value); + } + } + } + } + } + } }).export(module); diff --git a/test/stores/file-store-test.js b/test/stores/file-store-test.js index b085442..02ef9fc 100644 --- a/test/stores/file-store-test.js +++ b/test/stores/file-store-test.js @@ -195,14 +195,15 @@ vows.describe('nconf/stores/file').addBatch({ "the search() method": { "when the target file exists higher in the directory tree": { topic: function () { - var filePath = this.filePath = path.join(process.env.HOME, '.nconf'); + var searchBase = this.searchBase = process.env.HOME; + var filePath = this.filePath = path.join(searchBase, '.nconf'); fs.writeFileSync(filePath, JSON.stringify(data, null, 2)); return new (nconf.File)({ file: '.nconf' }) }, "should update the file appropriately": function (store) { - store.search(); + store.search(this.searchBase); assert.equal(store.file, this.filePath); fs.unlinkSync(this.filePath); }