Jovo v4 Azure Functions

manikanta · 2022-03-17 07:30:51 UTC

Hi,

We want to deploy handlers into Azure Cloud Functions. I don’t see any readily available integration for Azure. I’m trying to deploy using serverless. But app.prod.ts is returning export * from './server.lambda'; which is AWS Lambda specific.

server.lambda.ts:

import { APIGatewayEvent, Callback, Context, Lambda } from '@jovotech/server-lambda';

export const handler = async (event: APIGatewayEvent, context: Context, callback: Callback) => {
  await app.initialize();
  await app.handle(new Lambda(event, context, callback));
                       ^^^^^^
};

Is there any generic handler function which I can use for Azure Functions also? Thanks

manikanta · 2022-03-17 07:33:29 UTC

In future, we also want to support Google Cloud as well. So, code should be cloud-agnostic as much as possible. Any suggestions on this? Thanks

AlexSwe · 2022-03-17 13:41:42 UTC

Currently, we don’t have implementations for Azure Functions or Google Cloud.

However, it should work with both platforms. Not 100% sure, but I don’t think generic handlers would work. You just need to implement the abstract methods of the Server class.

Here’s the example for Lambda for v4: https://github.com/jovotech/jovo-framework/blob/v4/latest/integrations/server-lambda/src/Lambda.ts

Here are examples of Azure Functions and Google Cloud functions v3 implementations. Not fully compatibly, but you get the idea.

github.com

jovotech/jovo-framework/blob/v3/dev/jovo-framework/src/hosts/AzureFunction.ts

// tslint:disable-next-line
import { Context, HttpRequest } from '@azure/functions';
import { Host, JovoResponse, Log, LogEvent, LogLevel } from 'jovo-core';

const AZURE_FUNCTION_APPENDER_NAME = 'azureFunction';

export class AzureFunction implements Host {
  /**
   * Add an appender, if not already added, that writes logs to Azure Function's context.log.
   * The benefit of doing so, vs. just using console.log, is that the logs get associated with the request
   * in the Azure Portal. Otherwise the only way to see the logs is as a jumbled mess in Application Insights.
   *
   * @param contextLogLevel the minimum level of logs that will be logged
   */
  private static addContextLogger(contextLogLevel: LogLevel) {
    // If the appender was already added (which will be the case every time except the first request), don't add it again
    if (Log.config.appenders[AZURE_FUNCTION_APPENDER_NAME]) {
      return;
    }

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github.com

jovotech/jovo-framework/blob/v3/dev/jovo-framework/src/hosts/GoogleCloudFunction.ts

import { Host } from 'jovo-core';

export class GoogleCloudFunction implements Host {
  headers: { [key: string]: string };
  hasWriteFileAccess = false;
  req: any; // tslint:disable-line
  res: any; // tslint:disable-line
  $request: any; // tslint:disable-line

  constructor(req: any, res: any) {
    // tslint:disable-line
    this.req = req;
    this.res = res;
    this.headers = req.headers;
    this.$request = req.body;
  }

  getQueryParams(): Record<string, string> {
    return this.req.query || {};
  }

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manikanta · 2022-03-17 16:49:21 UTC

Thanks for the pointers @AlexSwe . I’ll try to implement Azure part first.

manikanta · 2022-03-18 13:43:36 UTC

I’m almost done with Azure Server implementation. But as suggested by Azure Functions docs and Jovo v3 Azure implementation, I couldn’t find a suitable Logger method for adding an appender (https://github.com/jovotech/jovo-framework/blob/v3/dev/jovo-framework/src/hosts/AzureFunction.ts#L15)

From’logleverl doc,

it does not let you reconfigure appenders

Any other way to add appender or delegate the Jovo logs to Azure context.log.xxx?