- Import-only connection type
- A limited set of request methods is supported. See Method entry below.
- Using a passphrase when generating an SSH key is not supported.
- JSON response from API endpoint is required. API endpoints that return XML responses are not supported.
- OAuth 2.0 authentication is not supported.
- After the initial connection to an endpoint is made, the schema is cached. The schema is not updated again until the connection is edited.
- By default, the number of endpoints that you can specify to use an individual connection is
10. This limit can be modified.
- For more information, see Workspace Settings Page.
You should identify the tables and (optional) data models for them that you wish to access.
You should acquire the credentials to access your target endpoints for one of the supported authentication methods.
If you are using a key or token to access the endpoints, you should generate this token before you begin.
Enable connections on the same cluster
For security reasons, the Designer Cloud application prevents connections from services external to the product from within the same cluster by default. If you are creating connections to REST applications that are hosted on the same cluster as the Trifacta node, additional configuration is required. Please complete the following configuration steps.
- You can apply this change through the Admin Settings Page (recommended) or
trifacta-conf.json. For more information, see Platform Configuration Methods.
Locate the following parameters and populate them as described below:
This parameter defines an array list of regular expressions for URLs that are permitted to connect to the data service. Please add the URL of the REST application to which you are connecting to the array list.
The following example permits URLs that include
This parameter defines the list of IP addresses that are prevented from connecting to the data service. Please remove the following from this list:
- Save your changes and restart the platform.
To create this connection, in the Connections page , select the Applications tab. Click the REST API card. See Connections Page.
Modify the following properties as needed:
The base URI for the endpoints to which you wish to connect through this connection. Example:
Tip: SSL access is supported over the HTTPS protocol.
|Connect String Options|
Apply any connection string options that are part of your authentication to REST API .
A default string has been provided for you. For more information, see below.
|Authentication Type||The method by which you wish to authenticate to the endpoint. See "Authentication types" below.|
|API endpoints||Specify the endpoints to which to connect. For more information, see "Configure endpoints" below.|
After you have defined the REST API credentials and connection string, you can validate those credentials.
|Connection Name||Display name of the connection|
|Connection Description||Description of the connection, which appears in the application.|
The following types of authentication are supported for REST API connections. For each type, additional properties may require configuration.
A username/password combination is submitted as part of any request for authentication.
|Username||Username to access the endpoints.|
|Password||Password associated with the username.|
HTTP Header Based Auth
Authentication is submitted using a key/value pair submitted in the HTTP request header.
|Header Key||Key for the header parameter used in authentication|
|Header Value||Credential associated with header authentication key|
HTTP Query Based Auth
Authentication is submitted using a query parameter key/value pair submitted as part of the URL.
|Query Key||Key for the query parameter used in authentication|
|Query Value||Credential associated with the query parameter authentication key|
Each endpoint and method combination must be configured. To add an endpoint, click Add endpoint.
The properties are described below.
API request method to use. Supported methods:
In some target systems, the
NOTE: Other methods are not supported for use.
The endpoint that you are accessing using the specified method.
Tip: The Base URI value and this value should form a complete URL.
|Table Name||(required) The name of the table with which you are interacting through this endpoint.|
Select the type of model used for the selected table:
For more information on these data model types, see https://cdn.cdata.com/help/DWE/jdbc/pg_RESTParsing.htm.
Select the type of pagination to request to the API endpoint. See "Pagination" below.
|Advanced options: Custom Header|
(optional) You can insert a custom header in the request as a key/value pair.
To add more headers, click Add.
|Advanced options: Query Parameter|
(optional) You can append a query parameter and value to the URL. These values are appended in the following form:
To add more query parameters, click Add.
|Advanced options: XPath||(optional) You can specify an XPath to be queried of the URL.|
For the selected endpoint, you can specify the type of pagination in use by the target application. Specifying the pagination allows the Designer Cloud application to retrieve larger sets of records when pagination is in use. For more information on these pagination methods, see http://cdn.cdata.com/help/DWE/ado/pg_customschemaselect.htm.
(default) No pagination is applied by the endpoint.
Next page URL:
When this method is selected, the URL of the next page of results is returned as part of the response body.
- Page URL path defines the XPath in the response to the attribute containing the URL of the next page.
A paging token may be returned as part of the response. To acquire the next page of results, this token must be submitted in the subsequent request as the value associated with the paging parameter.
- Page token path is the XPath to the token that must be submitted with the next request.
- Page token param is the parameter in the request into which the page token must be submitted.
- More pages param (optional) is used when the page token path must be submitted as a query parameter. This value defines the query parameter for which it is submitted.
Under this pagination method, subsequent pages of results can be queried based on defining the number of results (records) to offset with the query.
Page offset param defines the query parameter where you can specify the page offset to query.
Page size param defines the parameter in the request where you define the size in records of each request (page) of records.
Page size defines the number of records to request in a page.
Similar to record offset, this method queries results based on specified page numbers.
Page number param defines the query parameter where you can specify the page number to query.
Page size param defines the parameter in the request where you define the size in records of each page of records.
Page size defines the number of records to request in a page.
Connect string options
Too many requests error
During execution, you may receive an error similar from the driver to the following:
In this case, the default wait time for retrying a request (2 seconds) is not enough time, and the requests are piling up. You can address this issue by inserting the following connect string options:
The above option sets the wait time before retrying to 15000ms (15 seconds). You can experiment with this value as needed.
For more information on available connect string options, see https://cdn.cdata.com/help/DWE/ado/Connection.htm.
Create via API
This connection can also be created using the API.
Example - single GET method
The following example request creates a REST API connection with the following characteristics:
- Query parameters are used for authentication
- A single endpoint is enabled:
- Method: GET
Example - rate limiting
The following example creates a REST API connection to polygon.io with the following characteristics:
- Query-based authentication using key/value pair
- Connect String Options:
- Wait for retry:
- Wait for retry:
- Single endpoint to GET stock ticker information:
- Rate limiting on the endpoint (maximum queries per minute):
queryParams.dateis a parameter that is passed in for this specific connection type.
For more information, see https://api.trifacta.com/ee/9.2/index.html#operation/createConnection
You can import datasets from REST API through the Import Data page. See Import Data Page.
Tip: You can perform joins and unions using custom SQL as part of your initial request for data. It may be easier to import the tables as separate datasets and then to perform the join or union within the Designer Cloud application .
Using REST API Connections
This section describes how you interact through Designer Cloud Powered by Trifacta® Enterprise Edition with your REST data.
Designer Cloud Powered by Trifacta Enterprise Edition can use REST API connections for the following tasks:
Before you begin
Read Access: You must have credentials to create access the specific endpoints required to retrieve your data.
Write Access: Not supported
SSL is available over HTTPS for REST API connections.
You can create a Trifacta dataset from the following data models:
- flattened documents
- relational tables
These source objects are represented as tables in the import browser and as grid data in the Transformer page.
For more information, see Database Browser.
NOTE: Do not use the
POST methods to write data back into the target system.
Designer Cloud Powered by Trifacta Enterprise Edition
|Write||Not supported||Not supported||Not supported|
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