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Add an enum example (graph-gophers#587)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| <!DOCTYPE html> | ||
| <html lang="en"> | ||
| <head> | ||
| <title>GraphiQL</title> | ||
| <style> | ||
| body { | ||
| height: 100%; | ||
| margin: 0; | ||
| width: 100%; | ||
| overflow: hidden; | ||
| } | ||
| #graphiql { | ||
| height: 100vh; | ||
| } | ||
| </style> | ||
| <script src="https://unpkg.com/react@17/umd/react.development.js" integrity="sha512-Vf2xGDzpqUOEIKO+X2rgTLWPY+65++WPwCHkX2nFMu9IcstumPsf/uKKRd5prX3wOu8Q0GBylRpsDB26R6ExOg==" crossorigin="anonymous"></script> | ||
| <script src="https://unpkg.com/react-dom@17/umd/react-dom.development.js" integrity="sha512-Wr9OKCTtq1anK0hq5bY3X/AvDI5EflDSAh0mE9gma+4hl+kXdTJPKZ3TwLMBcrgUeoY0s3dq9JjhCQc7vddtFg==" crossorigin="anonymous"></script> | ||
| <link rel="stylesheet" href="https://unpkg.com/[email protected]/graphiql.min.css" /> | ||
| </head> | ||
| <body> | ||
| <div id="graphiql">Loading...</div> | ||
| <script src="https://unpkg.com/[email protected]/graphiql.min.js" type="application/javascript"></script> | ||
| <script> | ||
| ReactDOM.render( | ||
| React.createElement(GraphiQL, { | ||
| fetcher: GraphiQL.createFetcher({url: '/query'}), | ||
| defaultEditorToolsVisibility: true, | ||
| }), | ||
| document.getElementById('graphiql'), | ||
| ); | ||
| </script> | ||
| </body> | ||
| </html> |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| // Package main demonstrates a simple web app that uses type-safe enums in a GraphQL resolver. | ||
| package main | ||
|
|
||
| import ( | ||
| "context" | ||
| _ "embed" | ||
| "log" | ||
| "net/http" | ||
|
|
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| "github.com/graph-gophers/graphql-go" | ||
| "github.com/graph-gophers/graphql-go/relay" | ||
| ) | ||
|
|
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| //go:embed index.html | ||
| var page []byte | ||
|
|
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| //go:embed schema.graphql | ||
| var sdl string | ||
|
|
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| type resolver struct { | ||
| state State | ||
| } | ||
|
|
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| func (r *resolver) Query() *queryResolver { | ||
| return &queryResolver{state: &r.state} | ||
| } | ||
|
|
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| func (r *resolver) Mutation() *mutationResolver { | ||
| return &mutationResolver{state: &r.state} | ||
| } | ||
|
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| type queryResolver struct { | ||
| state *State | ||
| } | ||
|
|
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| func (q *queryResolver) State(ctx context.Context) State { | ||
| return *q.state | ||
| } | ||
|
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| type mutationResolver struct { | ||
| state *State | ||
| } | ||
|
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| func (m *mutationResolver) State(ctx context.Context, args *struct{ State State }) State { | ||
| *m.state = args.State | ||
| return *m.state | ||
| } | ||
|
|
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| func main() { | ||
| opts := []graphql.SchemaOpt{graphql.UseStringDescriptions()} | ||
| schema := graphql.MustParseSchema(sdl, &resolver{}, opts...) | ||
|
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| http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { w.Write(page) }) | ||
| http.Handle("/query", &relay.Handler{Schema: schema}) | ||
|
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| log.Fatal(http.ListenAndServe(":8080", nil)) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| type Query { | ||
| """ | ||
| Returns the current state. | ||
| """ | ||
| state: State! | ||
| } | ||
|
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| type Mutation { | ||
| """ | ||
| Changes the state and returns the new state. | ||
| """ | ||
| state(state: State!): State! | ||
| } | ||
|
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| """ | ||
| State holds the possible task states. | ||
| """ | ||
| enum State { | ||
| "Backlog indicates that a task is in the backlog and needs to be triaged." | ||
| BACKLOG | ||
| "Todo means that a task is ready to be worked on." | ||
| TODO | ||
| "INPROG means that a task is currently in progress." | ||
| INPROG | ||
| "Done means that a task is finished." | ||
| DONE | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,52 @@ | ||
| package main | ||
|
|
||
| import ( | ||
| "fmt" | ||
| ) | ||
|
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| // State represents a type-safe enum in Go which corresponds to the State enum in the GraphQL schema. | ||
| type State int | ||
|
|
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| const ( | ||
| Backlog State = iota // default value | ||
| TODO | ||
| InProg | ||
| Done | ||
| ) | ||
|
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| // the items in this array must have the exact same order as the corresponding constants above | ||
| var states = [...]string{"BACKLOG", "TODO", "INPROG", "DONE"} | ||
|
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| func (s State) String() string { return states[s] } | ||
|
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| func (s *State) Deserialize(str string) { | ||
| var found bool | ||
| for i, st := range states { | ||
| if st == str { | ||
| found = true | ||
| (*s) = State(i) | ||
| } | ||
| } | ||
| if !found { | ||
| panic("invalid value for enum State: " + str) | ||
| } | ||
| } | ||
|
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| // ImplementsGraphQLType instructs the GraphQL server that the State enum can be represented by the State type in Golang. | ||
| // If this method is missing we would get a runtime error that the State type can't be assigned a string. However, since | ||
| // this type implements the State enum, the server will try to call its [State.UnmarshalGraphQL] method to set a value. | ||
| func (State) ImplementsGraphQLType(name string) bool { | ||
| return name == "State" | ||
| } | ||
|
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| // UnmarshalGraphQL tries to unmarshal a type from a given GraphQL value. | ||
| func (s *State) UnmarshalGraphQL(input interface{}) error { | ||
| var err error | ||
| switch input := input.(type) { | ||
| case string: | ||
| s.Deserialize(input) | ||
| default: | ||
| err = fmt.Errorf("wrong type for State: %T", input) | ||
| } | ||
| return err | ||
| } |
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