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graphql.go
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/
graphql.go
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package graphql
import (
"fmt"
"reflect"
"github.com/ng-vu/graphql-go/internal/debug"
"github.com/ng-vu/graphql-go/internal/execution"
"github.com/ng-vu/graphql-go/internal/language"
"github.com/ng-vu/graphql-go/internal/types"
"github.com/ng-vu/graphql-go/internal/validation"
"github.com/ng-vu/graphql-go/ql"
)
var LOG = debug.New("graphql")
type RequestOpts struct {
RootValue interface{}
VariableValues map[string]interface{}
OperationName string
}
type Schema struct {
schema types.QLSchema
}
func NewSchema(query ql.Object, mutations ...ql.Object) (Schema, error) {
if len(mutations) > 1 {
panic("graphql: must provide only one mutation object")
}
var mutation *ql.Object
if len(mutations) == 1 {
mutation = new(ql.Object)
*mutation = mutations[0]
}
schema := types.NewQLSchema(query, mutation)
return Schema{schema}, nil
}
type Request struct {
schema types.QLSchema
documentAST *language.Document
opts RequestOpts
}
func NewRequest(schema Schema, request string, opts ...RequestOpts) (*Request, Errors) {
var _opts RequestOpts
if len(opts) > 1 {
panic("graphql: must provide only one Options object")
} else if len(opts) == 1 {
_opts = opts[0]
}
source := language.NewSource(request, "GraphQL request")
documentAST, err := language.Parse(source)
if err != nil {
return nil, _Errors{[]error{err}}
}
validationErrors := validation.Validate(schema.schema, documentAST, nil)
if validationErrors != nil {
errs := make([]error, len(validationErrors))
for i, e := range validationErrors {
errs[i] = e
}
return nil, _Errors{errs}
}
return &Request{schema.schema, documentAST, _opts}, nil
}
func (r *Request) Print() string {
return language.Print(r.documentAST)
}
func (r *Request) Run(value interface{}) error {
opts := execution.Options{
RootValue: r.opts.RootValue,
VariableValues: r.opts.VariableValues,
OperationName: r.opts.OperationName,
}
result := execution.Execute(r.schema, r.documentAST, opts)
if len(result.Errors) > 0 {
errors := make([]error, len(result.Errors))
for i, err := range result.Errors {
errors[i] = err
}
return _Errors{errors}
}
v := reflect.Indirect(reflect.ValueOf(value))
t := v.Type()
if t.Kind() != reflect.Struct {
panic("Only support struct as argument")
}
vResult := reflect.ValueOf(result.Data)
if vResult.Kind() != reflect.Map {
panic("Result must be a map")
}
for i, n := 0, t.NumField(); i < n; i++ {
tField := t.Field(i)
tag := tField.Tag.Get("graphql")
if tag == "" {
continue
}
vField := v.Field(i)
resultField := vResult.MapIndex(reflect.ValueOf(tag))
elemField := resultField.Elem()
if elemField.Type().AssignableTo(tField.Type) {
vField.Set(elemField)
} else {
LOG.Println("Cannot assign value to field", tField.Name, resultField)
}
}
return nil
}
func Run(schema Schema, request string, opts *RequestOpts, v interface{}) error {
req, err := NewRequest(schema, request, *opts)
if err != nil {
return err
}
return req.Run(v)
}
type Errors interface {
Error() string
AllErrors() []error
}
type _Errors struct {
errors []error
}
func (e _Errors) Error() string {
if len(e.errors) == 0 {
return ""
}
if len(e.errors) == 1 {
return e.errors[0].Error()
}
return fmt.Sprintf("%v (%v more)", e.errors[0].Error(), len(e.errors))
}
func (e _Errors) AllErrors() []error {
return e.errors
}