added gen-graphql-schema command

[yaswanth-godspeed]

Problem Description

What we need

• We need GraphQL integration in godspeed with Auto generation and Auto generation of resolvers with events and workflows.
• For this Auto generation of Graphql schema i added new command in cli.
• gen-graphql-schema helps to scan all graphql events, create graphql schema from event schema and create resolvers also.

Steps to use graphql plugin in project :

• Use godspeed plugin add and select graphql-as-eventsource to install graphql plugin.
• write events with corresponding workflows of graphql eventsource.
• Use gen-graphql-schema to auto generate graphql schema.
• once plugin added to your project, plugin auto detects graphql schema generated by gen-graphql-schema command.
• use godspeed dev to start dev server. you can see Apollo sandbox UI in localhost:4000 by default. From there you can do queries or mutations.

How we will approach

• go through graphql documentation and Apollo documentation.
• setup basic graphql plugin with events and workflows.
• add event schema and framework automatically adds validation.
• generate swagger schema from graphql events
• convert swagger.json to graphql schema
• Add new command gen-graphql-schema in cli to automate above 2 steps.
• write readme file with detailed instructions and examples.

What i tested:

• i tested gen-grapql-schema command manually. It perfectly generating schema of all graphql event sources.

For example we have 2 graphql event sources apollo1, apollo2.

Step 1: It asks select your graphql events and provide list of event sources we have in src/eventsource folder. Assume he selected apollo1, apollo2.

step 2: This command filters all events of this event sources separately and generates 2 swagger schema files in .temp folder.

step 3: converts swagger schema to apollo1.graphql and apollo2.graphql in .src/eventsources folder.

When he start server, plugin directly searches in
src/eventsource folder for schema files and starts graphql server.

While i am testing this code perfectly implemented above steps.

graphql plugin PR https://github.com/godspeedsystems/gs-plugins/pull/76

Issue linkhttps://github.com/godspeedsystems/gs-plugins/issues/70