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meta.go
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meta.go
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package plugins
import (
"context"
"fmt"
"net/http"
"sort"
"strings"
"github.com/graph-gophers/graphql-go"
"github.com/graph-gophers/graphql-go/relay"
"github.com/vektah/gqlparser/v2/ast"
"github.com/karatekaneen/bramble"
)
func init() {
bramble.RegisterPlugin(NewMetaPlugin())
}
var metaPluginSchema = `
directive @namespace on OBJECT
directive @boundary on OBJECT | FIELD_DEFINITION
type Service {
name: String!
version: String!
schema: String!
}
type BrambleService @boundary {
id: ID!
name: String!
version: String!
schema: String!
status: String!
serviceUrl: String!
fields: [BrambleField!]!
types: [BrambleType!]!
}
type BrambleFieldArgument {
name: String!
type: String!
}
type BrambleField @boundary {
id: ID!
name: String!
type: String!
service: String!
arguments: [BrambleFieldArgument!]!
description: String
}
type BrambleEnumValue {
name: String!
description: String
}
type BrambleType @boundary {
id: ID!
kind: String!
name: String!
directives: [String!]!
fields: [BrambleField!]!
enumValues: [BrambleEnumValue!]!
description: String
}
type BrambleSchema {
types: [BrambleType!]!
}
type BrambleMetaQuery @namespace {
services: [BrambleService!]!
schema: BrambleSchema!
field(id: ID!): BrambleField
type(id: ID!): BrambleType
service(id: ID!): BrambleService
}
type Query {
service: Service!
meta: BrambleMetaQuery!
getField(id: ID!): BrambleField @boundary
getType(id: ID!): BrambleType @boundary
getService(id: ID!): BrambleService @boundary
}
`
type metaPluginResolver struct {
Service struct {
Name string
Version string
Schema string
}
metaResolver *metaResolver
executableSchema *bramble.ExecutableSchema
}
func newMetaPluginResolver() *metaPluginResolver {
return &metaPluginResolver{
Service: struct {
Name string
Version string
Schema string
}{
Name: "bramble-meta-plugin",
Version: "latest",
Schema: metaPluginSchema,
},
metaResolver: &metaResolver{},
}
}
func (r *metaPluginResolver) Meta() *metaResolver {
return r.metaResolver
}
type brambleArg struct {
Name string
Type string
}
type brambleField struct {
ID graphql.ID
Name string
Type string
Service string
Description *string
Arguments []brambleArg
}
type brambleFields []brambleField
func (f brambleFields) Len() int {
return len(f)
}
func (f brambleFields) Less(i, j int) bool {
if f[i].Name == bramble.IdFieldName {
return true
}
return f[i].Name < f[j].Name
}
func (f brambleFields) Swap(i, j int) {
f[i], f[j] = f[j], f[i]
}
type brambleEnumValue struct {
Name string
Description *string
}
type brambleType struct {
Kind string
Name string
Directives []string
Fields []brambleField
EnumValues []brambleEnumValue
Description *string
}
func (t brambleType) Id() graphql.ID {
return graphql.ID(t.Name)
}
type brambleTypes []brambleType
func (t brambleTypes) Len() int {
return len(t)
}
func (t brambleTypes) Less(i, j int) bool {
return t[i].Name < t[j].Name
}
func (t brambleTypes) Swap(i, j int) {
t[i], t[j] = t[j], t[i]
}
type brambleSchema struct {
Types []brambleType
}
func (r *metaResolver) Schema() (*brambleSchema, error) {
schema := r.executableSchema.MergedSchema
var types brambleTypes
for name, def := range schema.Types {
types = append(types, r.brambleType(name, def))
}
sort.Sort(types)
return &brambleSchema{
Types: types,
}, nil
}
func kindToStr(k ast.DefinitionKind) string {
if k == ast.InputObject {
return "input"
}
if k == ast.Object {
return "type"
}
return strings.ToLower(string(k))
}
func strToPtr(s string) *string {
if s == "" {
return nil
}
return &s
}
func (r *metaPluginResolver) GetService(
ctx context.Context,
args struct{ ID graphql.ID },
) *brambleService {
return r.metaResolver.GetService(ctx, args)
}
func (r *metaResolver) GetService(
ctx context.Context,
args struct{ ID graphql.ID },
) *brambleService {
for _, service := range r.Services() {
if service.Name == string(args.ID) {
return &service
}
}
return nil
}
func (r *metaPluginResolver) GetType(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleType, error) {
return r.metaResolver.GetType(ctx, args)
}
func (r *metaResolver) GetType(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleType, error) {
typeName := string(args.ID)
for _, t := range r.getTypes(r.executableSchema.MergedSchema) {
if t.Name == typeName {
return &t, nil
}
}
return nil, nil
}
func (r *metaResolver) getTypes(schema *ast.Schema) []brambleType {
if schema == nil {
return nil
}
var result []brambleType
for _, def := range schema.Types {
result = append(result, r.brambleType(def.Name, def))
}
return result
}
func (r *metaResolver) brambleType(name string, def *ast.Definition) brambleType {
var fields brambleFields
for _, f := range def.Fields {
if strings.HasPrefix(f.Name, "__") {
continue
}
var svcName string
if svcURL, err := r.executableSchema.Locations.URLFor(def.Name, "", f.Name); err == nil {
svc := r.executableSchema.Services[svcURL]
svcName = svc.Name
}
var args []brambleArg
for _, a := range f.Arguments {
args = append(args, brambleArg{
Name: a.Name,
Type: a.Type.String(),
})
}
fields = append(fields, brambleField{
ID: graphql.ID(def.Name + "." + f.Name),
Name: f.Name,
Type: f.Type.String(),
Service: svcName,
Description: strToPtr(f.Description),
Arguments: args,
})
}
sort.Sort(fields)
var enum []brambleEnumValue
for _, v := range def.EnumValues {
enum = append(enum, brambleEnumValue{
Name: v.Name,
Description: strToPtr(v.Description),
})
}
var directives []string
for _, d := range def.Directives {
directives = append(directives, d.Name)
}
return brambleType{
Kind: kindToStr(def.Kind),
Name: name,
Directives: directives,
Fields: fields,
Description: strToPtr(def.Description),
EnumValues: enum,
}
}
func (r *metaResolver) Field(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleField, error) {
return r.GetField(ctx, args)
}
func (r *metaResolver) Type(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleType, error) {
return r.GetType(ctx, args)
}
func (r *metaResolver) Service(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleService, error) {
return r.GetService(ctx, args), nil
}
type metaResolver struct {
executableSchema *bramble.ExecutableSchema
}
func (r *metaPluginResolver) GetField(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleField, error) {
return r.metaResolver.GetField(ctx, args)
}
func (r *metaResolver) GetField(
ctx context.Context,
args struct{ ID graphql.ID },
) (*brambleField, error) {
for _, f := range r.getFields(r.executableSchema.MergedSchema) {
if f.ID == args.ID {
return &f, nil
}
}
return nil, nil
}
func (r *metaResolver) getFields(schema *ast.Schema) []brambleField {
if schema == nil {
return nil
}
var result []brambleField
for _, def := range schema.Types {
for _, f := range def.Fields {
var svcName string
if svcURL, err := r.executableSchema.Locations.URLFor(def.Name, "", f.Name); err == nil {
if svc := r.executableSchema.Services[svcURL]; svc != nil {
svcName = svc.Name
}
}
var args []brambleArg
for _, a := range f.Arguments {
args = append(args, brambleArg{
Name: a.Name,
Type: a.Type.String(),
})
}
result = append(result, brambleField{
ID: graphql.ID(def.Name + "." + f.Name),
Name: f.Name,
Type: f.Type.String(),
Service: svcName,
Description: strToPtr(f.Description),
Arguments: args,
})
}
}
return result
}
type brambleService struct {
Name string
Version string
Schema string
Status string
ServiceURL string
Fields []brambleField
Types []brambleType
}
func (s brambleService) Id() graphql.ID {
return graphql.ID(s.Name)
}
type externalBrambleServices []brambleService
func (s externalBrambleServices) Len() int {
return len(s)
}
func (s externalBrambleServices) Less(i, j int) bool {
// unreachable services have no name
if s[i].Name == s[j].Name {
return s[i].ServiceURL < s[j].ServiceURL
}
return s[i].Name < s[j].Name
}
func (s externalBrambleServices) Swap(i, j int) {
s[i], s[j] = s[j], s[i]
}
func (r *metaResolver) Services() []brambleService {
var services externalBrambleServices
for _, element := range r.executableSchema.Services {
services = append(services, brambleService{
Name: element.Name,
Version: element.Version,
Schema: element.SchemaSource,
Status: element.Status,
ServiceURL: element.ServiceURL,
Fields: r.getFields(element.Schema),
Types: r.getTypes(element.Schema),
})
}
sort.Sort(services)
return services
}
type MetaPlugin struct {
*bramble.BasePlugin
resolver *metaPluginResolver
}
func NewMetaPlugin() *MetaPlugin {
return &MetaPlugin{
resolver: newMetaPluginResolver(),
}
}
func (p *MetaPlugin) Init(s *bramble.ExecutableSchema) {
p.resolver.executableSchema = s
p.resolver.metaResolver.executableSchema = s
}
func (p *MetaPlugin) ID() string {
return "meta"
}
func (p *MetaPlugin) GraphqlQueryPath() (bool, string) {
return true, "bramble-meta-plugin-query"
}
func (p *MetaPlugin) SetupPrivateMux(mux *http.ServeMux) {
_, path := p.GraphqlQueryPath()
s := graphql.MustParseSchema(metaPluginSchema, p.resolver, graphql.UseFieldResolvers())
mux.Handle(fmt.Sprintf("/%s", path), &relay.Handler{Schema: s})
}