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Merge pull request #32551 from abrennan89/nodejs
[srvls][SRVOCF-278] Adding Nodejs functions docs
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‎_topic_map.yml‎

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- Name: Scheduling virtual machines
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File: virt-schedule-vms
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- Name: Configuring PCI passthrough
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File: virt-configuring-pci-passthrough
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File: virt-configuring-pci-passthrough
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# Importing virtual machines
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- Name: Importing virtual machines
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Dir: importing_vms
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# File: serverless-functions-getting-started
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# - Name: Setting up OpenShift Serverless Functions
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# File: serverless-functions-setup
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# - Name: Developing Node.js functions
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# File: serverless-developing-nodejs-functions
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# - Name: Developing Golang functions
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# File: serverless-developing-go-functions
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# - Name: Developing Python functions
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# File: serverless-developing-python-functions
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# - Name: Functions development reference guide
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# File: serverless-functions-reference-guide
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# Networking
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- Name: Networking
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Dir: networking

‎modules/serverless-nodejs-context-object-reference.adoc‎

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// Module included in the following assemblies
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//
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// * /serverless/functions/serverless-functions-reference-guide.adoc
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[id="serverless-nodejs-context-object-reference_{context}"]
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= Node.js context object reference
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The `context` object has several properties that can be accessed by the function developer.
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[id="serverless-nodejs-context-object-reference-log_{context}"]
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== log
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Provides a logging object that can be used to write output to the cluster logs. The log adheres to the link:https://getpino.io/#/docs/api[Pino logging API].
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.Example log
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[source,javascript]
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----
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function handle(context) {
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context.log.info(“Processing customer”);
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}
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----
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You can access the function by using the `curl` command to invoke it:
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.Example command
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[source,terminal]
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----
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$ curl http://example.com
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----
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.Example output
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[source,terminal]
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----
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{"level":30,"time":1604511655265,"pid":3430203,"hostname":"localhost.localdomain","reqId":1,"msg":"Processing customer"}
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----
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[id="serverless-nodejs-context-object-reference-query_{context}"]
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== query
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Returns the query string for the request, if any, as key-value pairs. These attributes are also found on the context object itself.
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.Example query
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[source,javascript]
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----
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function handle(context) {
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// Log the 'name' query parameter
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context.log.info(context.query.name);
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// Query parameters are also attached to the context
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context.log.info(context.name);
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}
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----
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You can access the function by using the `curl` command to invoke it:
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.Example command
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[source,terminal]
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----
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$ curl http://example.com?name=tiger
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----
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.Example output
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[source,terminal]
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----
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{"level":30,"time":1604511655265,"pid":3430203,"hostname":"localhost.localdomain","reqId":1,"msg":"tiger"}
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----
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[id="serverless-nodejs-context-object-reference-body_{context}"]
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== body
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Returns the request body if any. If the request body contains JSON code, this will be parsed so that the attributes are directly available.
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.Example body
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[source,javascript]
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----
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function handle(context) {
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// log the incoming request body's 'hello' parameter
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context.log.info(context.body.hello);
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}
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----
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You can access the function by using the `curl` command to invoke it:
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.Example command
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[source,terminal]
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----
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$ curl -X POST -d '{"hello": "world"}' -H 'Content-type: application/json' http://example.com
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----
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.Example output
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[source,terminal]
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----
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{"level":30,"time":1604511655265,"pid":3430203,"hostname":"localhost.localdomain","reqId":1,"msg":"world"}
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----
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[id="serverless-nodejs-context-object-reference-headers_{context}"]
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== headers
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Returns the HTTP request headers as an object.
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.Example header
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[source,javascript]
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----
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function handle(context) {
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context.log.info(context.headers["custom-header"]);
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}
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----
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You can access the function by using the `curl` command to invoke it:
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.Example command
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[source,terminal]
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----
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$ curl -H 'x-custom-header: some-value’' http://example.com
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----
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.Example output
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[source,terminal]
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----
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{"level":30,"time":1604511655265,"pid":3430203,"hostname":"localhost.localdomain","reqId":1,"msg":"some-value"}
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----
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[id="serverless-nodejs-context-object-reference-http-requests_{context}"]
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== HTTP requests
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method:: Returns the HTTP request method as a string.
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httpVersion:: Returns the HTTP version as a string.
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httpVersionMajor:: Returns the HTTP major version number as a string.
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httpVersionMinor:: Returns the HTTP minor version number as a string.

‎modules/serverless-nodejs-function-return-values.adoc‎

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// Module included in the following assemblies
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//
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// * /serverless/functions/serverless-developing-nodejs-functions.adoc
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[id="serverless-nodejs-function-return-values_{context}"]
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= Node.js function return values
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Functions can return any valid JavaScript type or can have no return value. When a function has no return value specified, and no failure is indicated, the caller receives a `204 No Content` response.
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Functions can also return a CloudEvent or a `Message` object in order to push events into the Knative Eventing system. In this case, the developer is not required to understand or implement the CloudEvent messaging specification. Headers and other relevant information from the returned values are extracted and sent with the response.
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.Example
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[source,javascript]
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----
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function handle(context, customer) {
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// process customer and return a new CloudEvent
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return new CloudEvent({
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source: 'customer.processor',
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type: 'customer.processed'
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})
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}
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----
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[id="serverless-nodejs-function-return-values-headers_{context}"]
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== Returning headers
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You can set a response header by adding a `headers` property to the `return` object. These headers are extracted and sent with the response to the caller.
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.Example response header
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[source,javascript]
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----
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function handle(context, customer) {
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// process customer and return custom headers
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// the response will be '204 No content'
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return { headers: { customerid: customer.id } };
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}
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----
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[id="serverless-nodejs-function-return-values-status-codes_{context}"]
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== Returning status codes
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You can set a status code that is returned to the caller by adding a `statusCode` property to the `return` object:
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.Example status code
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[source,javascript]
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----
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function handle(context, customer) {
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// process customer
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if (customer.restricted) {
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return { statusCode: 451 }
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}
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}
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----
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Status codes can also be set for errors that are created and thrown by the function:
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.Example error status code
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[source,javascript]
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----
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function handle(context, customer) {
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// process customer
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if (customer.restricted) {
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const err = new Error(‘Unavailable for legal reasons’);
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err.statusCode = 451;
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throw err;
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}
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}
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----

‎modules/serverless-nodejs-functions-context-objects.adoc‎

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// Module included in the following assemblies
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//
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// * /serverless/functions/serverless-developing-nodejs-functions.adoc
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[id="serverless-nodejs-functions-context-objects_{context}"]
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= Node.js context objects
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Functions are invoked by providing a `context` object as the first parameter.
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.Example context object
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[source,javascript]
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----
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function handle(context, data)
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----
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This object provides access to the incoming HTTP request information, including the HTTP request method, any query strings or headers sent with the request, the HTTP version, and the request body. Incoming requests that contain a CloudEvent attach the incoming instance of the CloudEvent to the context object so that it can be accessed by using `context.cloudevent`.
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[id="serverless-nodejs-functions-context-objects-methods_{context}"]
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== Context object methods
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The `context` object has a single method, `cloudEventResponse()`, that accepts a data value and returns a CloudEvent.
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In a Knative system, if a function deployed as a service is invoked by an event broker sending a CloudEvent, the broker examines the response. If the response is a CloudEvent, this event is handled by the broker.
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.Example context object method
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[source,javascript]
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----
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// Expects to receive a CloudEvent with customer data
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function handle(context, customer) {
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// process the customer
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const processed = handle(customer);
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return context.cloudEventResponse(customer)
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.source('/handle')
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.type('fn.process.customer')
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.response();
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}
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----
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[id="serverless-nodejs-functions-context-objects-cloudevent-data_{context}"]
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== CloudEvent data
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If the incoming request is a CloudEvent, any data associated with the CloudEvent is extracted from the event and provided as a second parameter. For example, if a CloudEvent is received that contains a JSON string in its data property that is similar to the following:
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[source,json]
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----
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{
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"customerId": "0123456",
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"productId": "6543210"
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}
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----
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When invoked, the second parameter to the function, after the `context` object, will be a JavaScript object that has `customerId` and `productId` properties.
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.Example signature
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[source,javascript]
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----
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function handle(context, data)
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----
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The `data` parameter in this example is a JavaScript object that contains the `customerId` and `productId` properties.

‎modules/serverless-nodejs-template.adoc‎

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// Module included in the following assemblies
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//
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// * /serverless/functions/serverless-developing-nodejs-functions.adoc
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[id="serverless-nodejs-template_{context}"]
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= Node.js function template structure
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When you create a Node.js function using the `kn` CLI, the project directory looks like a typical Node.js project, with the exception of an additional `func.yaml` configuration file.
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Both `http` and `event` trigger functions have the same template structure:
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.Template structure
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[source,terminal]
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----
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.
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├── func.yaml <1>
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├── index.js <2>
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├── package.json <3>
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├── README.md
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└── test <4>
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├── integration.js
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└── unit.js
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----
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<1> The `func.yaml` configuration file is used to determine the image name and registry.
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<2> Your project must contain an `index.js` file which exports a single function.
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<3> You are not restricted to the dependencies provided in the template `package.json` file. You can add additional dependencies as you would in any other Node.js project.
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+
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.Example of adding npm dependencies
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[source,terminal]
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----
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npm install --save opossum
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----
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When the project is built for deployment, these dependencies are included in the created runtime container image.
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<4> Integration and unit test scripts are provided as part of the function template.

‎modules/serverless-testing-nodejs-functions.adoc‎

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// Module included in the following assemblies
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//
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// * /serverless/functions/serverless-developing-nodejs-functions.adoc
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[id="serverless-testing-nodejs-functions_{context}"]
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= Testing Node.js functions
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Node.js functions can be tested locally on your computer. In the default project that is created when you create a function using `kn func create`, there is a *test* folder that contains some simple unit and integration tests.
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.Procedure
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* Run the tests:
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[source,terminal]
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----
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$ npm test
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----

‎serverless/functions/serverless-developing-nodejs-functions.adoc‎

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include::modules/serverless-document-attributes.adoc[]
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[id="serverless-developing-nodejs-functions"]
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= Developing Node.js functions
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:context: serverless-developing-nodejs-functions
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include::modules/common-attributes.adoc[]
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toc::[]
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:FeatureName: {FunctionsProductName}
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include::modules/technology-preview.adoc[leveloffset=+2]
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After you have xref:../../serverless/functions/serverless-functions-getting-started.adoc#serverless-create-func-kn_serverless-functions-getting-started[created a Node.js function project], you can modify the template files provided to add business logic to your function.
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[id="prerequisites_serverless-developing-nodejs-functions"]
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== Prerequisites
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* Before you can develop functions, you must complete the steps in xref:../../serverless/functions/serverless-functions-setup.adoc#serverless-functions-setup[Setting up {FunctionsProductName}].
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include::modules/serverless-nodejs-template.adoc[leveloffset=+1]
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[id="serverless-developing-nodejs-functions-about-invoking_{context}"]
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== About invoking Node.js functions
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When using the `kn` CLI to create a function project, you can generate a project that responds to CloudEvents, or one that responds to simple HTTP requests. CloudEvents in Knative are transported over HTTP as a POST request, so both function types listen for and respond to incoming HTTP events.
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Node.js functions can be invoked with a simple HTTP request. When an incoming request is received, functions are invoked with a `context` object as the first parameter.
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include::modules/serverless-nodejs-functions-context-objects.adoc[leveloffset=+2]
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include::modules/serverless-nodejs-function-return-values.adoc[leveloffset=+1]
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include::modules/serverless-testing-nodejs-functions.adoc[leveloffset=+1]
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[id="next-steps_serverless-developing-nodejs-functions"]
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== Next steps
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* See the xref:../../serverless/functions/serverless-functions-reference-guide.adoc#serverless-nodejs-context-object-reference_serverless-functions-reference-guide[Node.js context object reference] documentation.
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* xref:../../serverless/functions/serverless-functions-getting-started.adoc#serverless-build-func-kn_serverless-functions-getting-started[Build] and xref:../../serverless/functions/serverless-functions-getting-started.adoc#serverless-deploy-func-kn_serverless-functions-getting-started[deploy] a function.

‎serverless/functions/serverless-functions-about.adoc‎

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{FunctionsProductName} provides templates that can be used to create basic functions for the following runtimes:
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// add xref links to docs once added
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* Node.js
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* xref:../../serverless/functions/serverless-developing-nodejs-functions.adoc#serverless-developing-nodejs-functions[Node.js]
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* xref:../../serverless/functions/serverless-developing-python-functions.adoc#serverless-developing-python-functions[Python]
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* xref:../../serverless/functions/serverless-developing-go-functions.adoc#serverless-developing-go-functions[Golang]
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* Quarkus

‎serverless/functions/serverless-functions-getting-started.adoc‎

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include::modules/serverless-create-func-kn.adoc[leveloffset=+1]
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include::modules/serverless-build-func-kn.adoc[leveloffset=+1]
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include::modules/serverless-deploy-func-kn.adoc[leveloffset=+1]
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[id="additional-resources_serverless-functions-getting-started"]
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== Additional resources
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* See the reference documentation for xref:../../serverless/cli_reference/kn-func-ref.adoc#kn-func-ref[`kn func`].

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