How to post a http request to server side based DGS?

[nandychen]

For example: there is a client named A which is developed with javascript，and a server named B developed with DGS。Now i want to send a post request to query some data from B, the question is how should we handle the incoming http request? I found there no any code samples like controllers in spring mvc, the methods annotated with @DgsData or @DgsQuery cannot interact with the springmvc request.

[srinivasankavitha]

Assuming you are posting a graphql request to server B, the DGS framework will handle that under the hood. All you need to do is implement the data fetcher, i.e. a method annotated with @DgsQuery or @DgsMutation as applicable for the request. The framework is built on top of graphql-java and the request is handled field by field by invoking the appropriate data fetchers that you have implemented for each field: https://www.graphql-java.com/tutorials/getting-started-with-spring-boot The DGS framework provides ***@***.***` annotation as a shortcut way to wire up the data fetchers: https://netflix.github.io/dgs/getting-started/ Hope this helps.

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On Tue, Jan 18, 2022 at 8:52 PM Nandy ***@***.***> wrote: For example: there is a client named A which is developed with javascript，and a server named B developed with DGS。Now i want to send a post request to query some data from B, the question is how should we handle the incoming http request? I found there no any code samples like controllers in spring mvc, the methods annotated with @DgsData or @DgsQuery cannot interact with the springmvc request. — Reply to this email directly, view it on GitHub <#825>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AJ5JPXM5R7AHT6NAZIQBOGLUWY7RVANCNFSM5MI5H6GA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[nandychen]

Hi SrinivasanKavitha, thank you so much for the reply. It's very helpful to quick start on DGS. One more thing, i want to ask for advice for this problem:

The client A stated above is an app developed with vue, and the server B is an api-gateway which accept the http request posted from A, and then dispatch the request to downstream server C(provide restful api) which act as the DataFetcher, for example:

step 1 - [Post request from A]:

curl -X POST http://127.0.0.1:8080/graphql
-H 'Content-Type: application/json'
-H 'x-uid: 1'
-H 'x-openid: xxx'
-d '{"query": "query GetGoodsDetails($spuId: ID!) {\n getGoodsDetails(spuId: $spuId) {\n spu {\n spuId\n name\n stock\n }\n merchant {\n merchantId\n name\n }\n brandInfo {\n id\n name\n logo\n }\n }\n}","variables":{"spuId":"xxx123"},"operationName":"GetGoodsDetails"}'

step 2 - [Accept the request above and parse the query,operationName,variables in server B, and then next step]

step 3 - [Dispatch the request to downstream server C to get data accorded with the dynamic GraphQL schemas parsed in server B]

My question is: Is this pattern appropriate to integrate with downstream servers? is there any performance issues? any solutions in DGS?

Thank you!