A Connector project is similar in structure to a project. This guide covers how to manage your Connector project.
To add a connector to your project, see Add a Connector.
A Connector project is made up of several components. To simplify development, API Builder primarily uses a strict directory structure and naming convention to organize the application rather than configuration files.
The following is a list of directories and files that can be found in a Connector project:
|Entry point to the connector for testing, which launches a server instance.|
|Project configuration file. Do not modify this file.|
|Contains configuration files in JSON format for the connector. The |
|Entry point to the connector.|
|Contains the logic for your connector. Requires an |
|Contains generated log files when running your project locally. If you test the connector, the generated log files will get packaged with the application. You may want to disable logging by setting the |
|Contains project dependencies. API Builder automatically installs any project dependencies declared in the |
|NPM configuration file to declare project dependencies and other build or runtime configurations.|
Use the Appcelerator CLI to create, test and deploy your Connector project.
Create a connector
To create a new connector, from your workspace directory, execute the
appc generate command. When prompted:
- Select Component for the type of component
- Select Connector for the component
- Select Empty Connector Project to use a boilerplate project.
- Enter a name and directory name for your project.
Test the connector
Like an API Builder project, you can locally run the Connector project and make APIs calls to it. From the project directory, execute:
Once the server starts, you can make cURL or other requests to the server. Open the admin console, then go to the API Docs tab to retrieve the cURL commands for the methods. Copy and paste a command in a terminal to test it.
Publish the connector
To publish the connector, execute the following command from the project directory:
By default, the access level for the connector is set to private, so only the creator can access the connector. To share the connector with other people or publicly, specify a different access level with the
appc access command and add people or organizations to your component using the
appc user and
appc org commands.
Place all the connector logic in the
lib folder. There must be an
index.js file in your
lib folder, which is the first file loaded by the connector.
index.js file expose a
create() method, which is passed the API Builder class. The method must return a Connector instance, which is created using the
Arrow.Connector.extend() method. Uncomment each Capability constant in the
extend() method an object, which implements the methods of the Connector class and a few methods from the Model class.
To start developing your connector, run the project in one console window, then edit the files with the connector logic in another console or editor. As you save your files, API Builder will automatically update your connector and restart the server instance, allowing you to work on and test the connector incrementally.
API Builder is based on Arrow and starting with API Builder 1.2.48 or Appcelerator CLI 4.1.3, the connector configuration object passed to the
Connector.extend() method supports a
capabilities property. The first time you run a project after adding a Capability constant to the
capabilities property, API Builder will generate boilerplate logic, which you can modify. The table below explains what each capability constant exposes and creates. If a certain connector is not exposed through a capability, you can implement the method in the object passed to the
|Capability Constant||Location||Exposed Connector Methods|
|ContainsModels||Creates a boiler plate model in the |
If you need to add some custom initialization logic when creating the connector, implement the following methods. The connector instance is the value passed to
this in the functions. The functions do not take any arguments or return any values:
|constructor(void)||Use to execute some custom logic when the connector is created.|
|postCreate(void)||Use to execute some custom logic after the connector instance is created but before it is returned.|
When the connector is loaded, the following methods are executed (in order and if defined). You do not need to implement any of the methods. Each method is passed a callback. After completing the operation, invoke the callback function and pass it an Error object (or null if successful) as the first parameter, and the results of the operation as the second parameter. None of the methods have a return value.
|Method Signature||Capability||Boiler Plate File||Description||Result to Pass to the Callback|
|ValidatesConfiguration||Retrieves the metadata of the data source. The metadata is used to validate the configuration object.||Metadata object. Set the |
|-||-||Retrieves the configuration of the data source.||Configuration object. Key-value pairs describing the configuration of the connector.|
|connect(callback)||ConnectToADataSource||Connects to the data source.||None.|
|GenerateModels||Retrieves the model schema of the data source.||Schema object.|
|disconnect(callback)||ConnectToADataSource||Disconnect from the data source.||None.|
To access data from the Connector, you need to implement the following methods. Each method is passed the Model class as its first parameter and a callback as its last parameter. After completing the operation, invoke the callback function and pass it an Error object (or null if successful) as the first parameter, and the results of the operation as the second parameter. None of the methods have a return value.
|Method Signature||Capability||Boiler Plate File||Description||Result to Pass to the Callback|
|create(Model, values, callback)||CanCreate||Creates a new model using the passed values.||New model|
|delete(Model, instance, callback)||CanDelete||Deletes the model instance.||Deleted model|
|deleteAll(Model, callback)||CanDelete||Deletes all the models.||Array of deleted models|
|findAll(Model, callback)||CanRetrieve||Retrieves all the models.||Array of models|
|findById(Model, id, callback)||CanRetrieve||Retrieves one model with the specified ID (||A model|
|query(Model, options, callback)||CanRetrieve||Retrieves all models based on the query options.||Array of found models|
|distinct(Model, field, options, callback)||CanRetrieve||Retrieves a distinct set of models based on the field(s) and query options.||Array of distinct models|
|save(Model, instance, callback)||CanUpdate||Updates the model instance.||Updated model|
|findAndModify(Model, options, doc, args, callback)||CanUpdate||Finds one model instance and modifies it.||Modified model|
|upsert(Model, id, doc, callback)||CanUpdate||Updates the model instance if found or creates a new model instance.||Updated or new model|
If a request requires a login or if you want to intercept the request before or after it completes, you can implement the following methods:
|Method Signature||Capability||Boiler Plate File||Description|
|startRequest(methodName, args, request, next)||-||-|
Request interceptor invoked before the request is initiated and the login method is invoked. The method is passed the name of the method that started the request and the arguments passed to the method. Invoke the next function when the operation completes.
|Determines if the request required a login. Pass an error message (or null if successful) as the first parameter to callback and a boolean value indicating if the login method needs to be executed (true) or not (false) as the second parameter.|
|Logs into the data source to make a request. Invoke the next function when the operation completes.|
|endRequest(methodName, args, request, next)||-||-||Request interceptor invoked after the request completes . The method is passed the name of the method that started the request and the arguments passed to the method. Invoke the next function when the operation completes.|
Connector configuration file
To have the Appcelerator CLI create a default configuration file for your connector when it is installed, create a sample configuration file that exports a JSON object in the
conf directory, then reference the file in the connector logic with the
defaultConfig property in the implementation object passed to the
For example, create a file called
example.config.js in the
conf directory and add the following content to it:
Then reference the file in the connector logic using the
When the Appcelerator CLI installs the connector, it will copy and rename the file to the project's
Models and API endpoints
To allow an application to interact with the connector, you need to create a model definition file to define the schema of the data from the connector for the project to access. For more details about creating a model, see Models.
By default, when you install a connector, it will add its API endpoints to the application. If you do not want to generate these API endpoints, set the
modelAutogen key to
false in the connector's configuration file in the project.
You may specify specific models to generate from a connector. Set the
generateModels key to an array of model names you want to include.
The application can import any third-party modules that are supported by standard Node.js applications. Before publishing the app to the cloud, make sure all dependencies are listed in the
dependencies field in the application's
package.json file. For example, to add support for MongoDB 1.2.0 or greater: