Run a basic GraphQL server using plumber. This server is provided to show basic interaction with GraphQL. The server will run until the function execution is canceled.
server(
schema,
port = 8000L,
...,
graphiql = interactive(),
log = TRUE,
initial_value = NULL
)Schema object to use execute requests
web port to serve the server from. Set port to NULL to not run the plumber server and return it.
ignored for paramter expansion
logical to determine if the GraphiQL interface should be enabled. By default, this route is only available when running the server interactively.
boolean that determines if server logging is done. Defaults to TRUE
default value to use in execute_request()
To view the GraphiQL user interface, navigate to the URL provided when the server is started. The default location is http://localhost:8000/graphiql/. By default, this route is only available when running the server interactively (graphiql = rlang::is_interactive()).
server() implements the basic necessities described in http://graphql.org/learn/serving-over-http/. There are four routes implemented:
/ (GET) If run interactively, forwards to /graphiql for user interaction with the GraphQL server. This route is diabled if graphiql = rlang::is_interactive() is not TRUE.
/graphiql/ (GET) Returns a GraphiQL formatted schema definition interface to manually interact with the GraphQL server. By default this route is disabled if graphiql = rlang::is_interactive() is not TRUE.
/graphql (GET) Executes a query. The parameter 'query' (which contains a GraphQL formatted query string) must be included. Optional parameters include: 'variables' a JSON string containing a dictionary of variables (defaults to an empty named list), 'operationName' name of the particular query operation to execute (defaults to NULL), and 'pretty' boolean to determine if the response should be compact (FALSE, default) or expanded (TRUE)
/graphql (POST) Executes a query. Must provide Content-Type of either 'application/json' or 'application/graphql'.
If 'application/json' is provided, a named JSON list containing 'query', 'operationName' (optional, default = NULL), 'variables' (optional, default = list()) and 'pretty' (optional, default = TRUE). The information will used just the same as the GET-'/graphql' route.
If 'application/graphql' is provided, the POST body will be interpreted as the query string. All other possible parameters will take on their default value.
Using bash's curl, we can ask the server questions:
#R
# load Star Wars schema from 'execute_request' example
example(gqlr_schema)
# run server
server(star_wars_schema, port = 8000)
#bash
# GET Schema definition
curl '127.0.0.1:8000/'## POST for R2-D2 and his friends' names # defaults to parse as JSON curl --data '{"query":"{hero{name, friends { name }}}", "pretty": true}' '127.0.0.1:8000/graphql' # send json header curl --data '{"query":"{hero{name, friends { name }}}"}' '127.0.0.1:8000/graphql' --header "Content-Type:application/json" # send graphql header curl --data '{hero{name, friends { name }}}' '127.0.0.1:8000/graphql' --header "Content-Type:application/graphql" # use variables curl --data '{"query":"query Droid($someId: String!) {droid(id: $someId) {name, friends { name }}}", "variables": {"someId": "2001"}}' '127.0.0.1:8000/graphql'
# GET R2-D2 and his friends' names curl '127.0.0.1:8000/graphql?query= # ... using a variable curl '127.0.0.1:8000/graphql?query=query