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introspection.go
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introspection.go
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package graphql
import (
"bytes"
"context"
"encoding/json"
"text/template"
"github.com/Khan/genqlient/graphql"
)
// introspectionQueryTpl comes from
// https://github.com/graphql/graphql-js/blob/0276d685b51262686c841763ba0b6e71103f64f3/src/utilities/introspectionQuery.js
const introspectionQueryTpl = `
query IntrospectionQuery {
__schema {
queryType { name }
mutationType { name }
subscriptionType { name }
types {
...FullType
}
directives {
name
{{ if .InclDescriptions }}description{{ end }}
locations
args {
...InputValue
}
}
}
}
fragment FullType on __Type {
kind
name
{{ if .InclDescriptions }}description{{ end }}
fields(includeDeprecated: true) {
name
{{ if .InclDescriptions }}description{{ end }}
args {
...InputValue
}
type {
...TypeRef
}
isDeprecated
deprecationReason
}
inputFields {
...InputValue
}
interfaces {
...TypeRef
}
enumValues(includeDeprecated: true) {
name
{{ if .InclDescriptions }}description{{ end }}
isDeprecated
deprecationReason
}
possibleTypes {
...TypeRef
}
}
fragment InputValue on __InputValue {
name
{{ if .InclDescriptions }}description{{ end }}
type { ...TypeRef }
defaultValue
}
fragment TypeRef on __Type {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
ofType {
kind
name
}
}
}
}
}
}
}
}
`
type introspectionQueryOptions struct {
InclDescriptions bool
}
func introspectionQuery(opts introspectionQueryOptions) string {
t := template.Must(template.New("introspectionQuery").Parse(introspectionQueryTpl))
var buf bytes.Buffer
if err := t.Execute(&buf, opts); err != nil {
panic(err)
}
return buf.String()
}
func (c *Client) IntrospectionQuery(ctx context.Context) (json.RawMessage, error) {
q := introspectionQuery(introspectionQueryOptions{InclDescriptions: false})
var result graphql.Response
err := c.Client.MakeRequest(ctx, &graphql.Request{Query: q, OpName: "IntrospectionQuery"}, &result)
if err != nil {
return nil, err
}
return json.Marshal(result.Data)
}