[GitHub] [incubator-openwhisk-apigateway] chetanmeh opened a new pull request #347: Enable overriding the backend url to enable standalone mode

[GitBox <gi...@apache.org>]

chetanmeh opened a new pull request #347: Enable overriding the backend url to enable standalone mode
URL: https://github.com/apache/incubator-openwhisk-apigateway/pull/347
 
 
   This PR enables running api gateway with standalone server (#4571). 
   
   It also fixes current broken build by updating the `opm` version
   
   ### Implementation Details
   
   Api Gateway uses the backend url as computed by [makeWebActionBackendUrl][1] in `createApi` call. This backend url is based on url passed by `wsk api` command
   
   ```json
   {"apidoc":{"namespace":"_","gatewayBasePath":"/hello","gatewayPath":"/world","gatewayMethod":"GET","id":"API:_:/hello","action":{"name":"hello","namespace":"_","backendMethod":"GET","backendUrl":"http://localhost:3233/api/v1/web/_/default/hello.http","authkey":"23bc46b1-71f6-4ed5-8c54-816aa4f8c502:123zO3xZCLrMN6v2BKK1dXYFpXlPkccOFqm12CdAsMgRU4VrNZ9lyGVCGuMDGIwP"}}}
   ```
   
   With standalone case this url becomes `http://localhost:3233` and is used as is by api gateway routing logic. So to enable this flow to work the `backendRouting` logic now exposes a env variable `BACKEND_HOST`. If this variable is found to be set then it supersedes the backend url as specified in `createApi` call
   
   [1]: https://github.com/chetanmeh/incubator-openwhisk/blob/29d0d5d922d13e662c20b6bec129ade6d30d0140/core/routemgmt/common/apigw-utils.js#L602

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