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testserver.go
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testserver.go
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package testserver
import (
"context"
"fmt"
"time"
"github.com/99designs/gqlgen/graphql"
"github.com/99designs/gqlgen/graphql/handler"
"github.com/vektah/gqlparser/v2"
"github.com/vektah/gqlparser/v2/ast"
)
// New provides a server for use in tests that isn't relying on generated code. It isnt a perfect reproduction of
// a generated server, but it aims to be good enough to test the handler package without relying on codegen.
func New() *TestServer {
next := make(chan struct{})
completeSubscription := make(chan struct{})
schema := gqlparser.MustLoadSchema(&ast.Source{Input: `
type Query {
name: String!
find(id: Int!): String!
}
type Mutation {
name: String!
}
type Subscription {
name: String!
}
`})
srv := &TestServer{
next: next,
completeSubscription: completeSubscription,
}
srv.Server = handler.New(&graphql.ExecutableSchemaMock{
ExecFunc: func(ctx context.Context) graphql.ResponseHandler {
rc := graphql.GetOperationContext(ctx)
switch rc.Operation.Operation {
case ast.Query:
ran := false
return func(ctx context.Context) *graphql.Response {
if ran {
return nil
}
ran = true
// Field execution happens inside the generated code, lets simulate some of it.
ctx = graphql.WithFieldContext(ctx, &graphql.FieldContext{
Object: "Query",
Field: graphql.CollectedField{
Field: &ast.Field{
Name: "name",
Alias: "name",
Definition: schema.Types["Query"].Fields.ForName("name"),
},
},
})
res, err := graphql.GetOperationContext(ctx).ResolverMiddleware(ctx, func(ctx context.Context) (interface{}, error) {
return &graphql.Response{Data: []byte(`{"name":"test"}`)}, nil
})
if err != nil {
panic(err)
}
return res.(*graphql.Response)
}
case ast.Mutation:
return graphql.OneShot(graphql.ErrorResponse(ctx, "mutations are not supported"))
case ast.Subscription:
return func(context context.Context) *graphql.Response {
select {
case <-ctx.Done():
return nil
case <-next:
return &graphql.Response{
Data: []byte(`{"name":"test"}`),
}
case <-completeSubscription:
return nil
}
}
default:
return graphql.OneShot(graphql.ErrorResponse(ctx, "unsupported GraphQL operation"))
}
},
SchemaFunc: func() *ast.Schema {
return schema
},
ComplexityFunc: func(typeName string, fieldName string, childComplexity int, args map[string]interface{}) (i int, b bool) {
return srv.complexity, true
},
})
return srv
}
// NewError provides a server for use in resolver error tests that isn't relying on generated code. It isnt a perfect reproduction of
// a generated server, but it aims to be good enough to test the handler package without relying on codegen.
func NewError() *TestServer {
next := make(chan struct{})
schema := gqlparser.MustLoadSchema(&ast.Source{Input: `
type Query {
name: String!
}
`})
srv := &TestServer{
next: next,
}
srv.Server = handler.New(&graphql.ExecutableSchemaMock{
ExecFunc: func(ctx context.Context) graphql.ResponseHandler {
rc := graphql.GetOperationContext(ctx)
switch rc.Operation.Operation {
case ast.Query:
ran := false
return func(ctx context.Context) *graphql.Response {
if ran {
return nil
}
ran = true
graphql.AddError(ctx, fmt.Errorf("resolver error"))
return &graphql.Response{
Data: []byte(`null`),
}
}
case ast.Mutation:
return graphql.OneShot(graphql.ErrorResponse(ctx, "mutations are not supported"))
case ast.Subscription:
return graphql.OneShot(graphql.ErrorResponse(ctx, "subscription are not supported"))
default:
return graphql.OneShot(graphql.ErrorResponse(ctx, "unsupported GraphQL operation"))
}
},
SchemaFunc: func() *ast.Schema {
return schema
},
ComplexityFunc: func(typeName string, fieldName string, childComplexity int, args map[string]interface{}) (i int, b bool) {
return srv.complexity, true
},
})
return srv
}
type TestServer struct {
*handler.Server
next chan struct{}
completeSubscription chan struct{}
complexity int
}
func (s *TestServer) SendNextSubscriptionMessage() {
select {
case s.next <- struct{}{}:
case <-time.After(1 * time.Second):
fmt.Println("WARNING: no active subscription")
}
}
func (s *TestServer) SendCompleteSubscriptionMessage() {
select {
case s.completeSubscription <- struct{}{}:
case <-time.After(1 * time.Second):
fmt.Println("WARNING: no active subscription")
}
}
func (s *TestServer) SetCalculatedComplexity(complexity int) {
s.complexity = complexity
}