forked from tmc/parse_graphql
/
parse_class.go
227 lines (209 loc) · 6.16 KB
/
parse_class.go
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package parse_graphql
import (
"encoding/json"
"fmt"
"log"
"github.com/davecgh/go-spew/spew"
"github.com/tallstreet/graphql"
"github.com/tallstreet/graphql/executor/resolver"
"github.com/tallstreet/graphql/executor/tracer"
"github.com/tallstreet/graphql/schema"
"github.com/tmc/parse"
"golang.org/x/net/context"
)
var DefaultLimit = 5
type ParseClass struct {
client *parse.Client
class *parse.Schema
schema map[string]*parse.Schema
Data map[string]interface{}
}
func NewParseClass(client *parse.Client, className string, schema map[string]*parse.Schema) (*ParseClass, error) {
class, ok := schema[className]
if !ok {
return nil, fmt.Errorf("class '%s' not found in schema.", className)
}
return &ParseClass{
client: client,
class: class,
schema: schema,
}, nil
}
func (p *ParseClass) GraphQLTypeInfo() schema.GraphQLTypeInfo {
className := p.class.ClassName
ti := schema.GraphQLTypeInfo{
Name: p.class.ClassName,
Description: fmt.Sprintf("Parse Class %v", className),
Fields: schema.GraphQLFieldSpecMap{
className: &schema.GraphQLFieldSpec{
Name: p.class.ClassName,
Description: fmt.Sprintf("Root field to fetch %s", className),
Func: p.get,
IsRoot: true,
},
},
}
ti.Fields["id"] = &schema.GraphQLFieldSpec{
Name: "id",
Description: fmt.Sprintf("Accessor for %s field (%v)", "id", "String"),
Func: func(ctx context.Context, r resolver.Resolver, f *graphql.Field) (interface{}, error) {
partial, err := p.resolve(ctx, r, f)
if err != nil {
return nil, err
}
return r.Resolve(ctx, partial, f)
},
}
// generate basic value accessors
for fieldName, fieldSchema := range p.class.Fields {
fn := fieldName
ti.Fields[fieldName] = &schema.GraphQLFieldSpec{
Name: fn,
Description: fmt.Sprintf("Accessor for %s field (%v)", fn, fieldSchema.Type),
Func: func(ctx context.Context, r resolver.Resolver, f *graphql.Field) (interface{}, error) {
partial, err := p.resolve(ctx, r, f)
if err != nil {
return nil, err
}
return r.Resolve(ctx, partial, f)
},
}
}
return ti
}
func (p *ParseClass) resolve(ctx context.Context, r resolver.Resolver, field *graphql.Field) (interface{}, error) {
log.Println("resolving ===============================================")
fieldInfo := p.class.Fields[field.Name]
if fieldInfo.Type == "Pointer" {
return p.resolvePointer(ctx, r, field)
} else if fieldInfo.Type == "ReversePointer" {
return p.resolveReversePointer(ctx, r, field)
} else if fieldInfo.Type == "HookFunction" {
return mkHookFieldFunc(p.client, p.schema, p.class.ClassName+"_"+field.Name, p.Data)(ctx, r, field)
} else if field.Name == "id" {
return p.Data["objectId"], nil
} else {
return p.Data[field.Name], nil
}
}
func (p *ParseClass) resolvePointer(ctx context.Context, r resolver.Resolver, field *graphql.Field) (interface{}, error) {
fieldName := field.Name
fieldInfo := p.class.Fields[fieldName]
pc, err := NewParseClass(p.client, fieldInfo.TargetClass, p.schema)
if err != nil {
return nil, err
}
// only resolve if we can obtain the objectId
data, ok := p.Data[fieldName]
if !ok {
return nil, nil
}
asMap, ok := data.(map[string]interface{})
if !ok {
return nil, nil
}
oid := asMap["objectId"]
if oid == nil {
return nil, nil
}
objectID, ok := oid.(string)
if !ok {
return nil, nil
}
if t, ok := tracer.FromContext(ctx); ok {
t.IncQueries(1)
}
err = pc.client.GetClass(fieldInfo.TargetClass, objectID, &pc.Data)
return pc, err
}
func (p *ParseClass) resolveReversePointer(ctx context.Context, r resolver.Resolver, field *graphql.Field) (interface{}, error) {
fieldInfo := p.class.Fields[field.Name]
pc, err := NewParseClass(p.client, fieldInfo.TargetClass, p.schema)
if err != nil {
return nil, err
}
fieldName := field.Name[len(fieldInfo.TargetClass)+1:]
// TODO(tallstreet): optimize
query := []byte(fmt.Sprintf(`{"__type":"Pointer","className":"%s","objectId":"%s"}`,
p.class.ClassName,
p.Data["objectId"]))
queryEncoded := json.RawMessage(query)
return pc.get(ctx, r, &graphql.Field{
Arguments: []graphql.Argument{
{
Name: fieldName,
Value: &queryEncoded,
},
},
})
}
var specialFields = []string{"order", "limit", "skip", "keys", "include", "where"}
var specialFieldsSet map[string]bool
func (p *ParseClass) get(ctx context.Context, r resolver.Resolver, f *graphql.Field) (interface{}, error) {
var results []map[string]interface{}
// TODO(tallstreet): handle overlap between special fields and user defined fields on a class elegantly
whereClause := make(map[string]interface{})
for _, a := range f.Arguments {
// only populate where clause if the field isn't in out special field list
if !specialFieldsSet[a.Name] {
whereClause[a.Name] = a.Value
}
}
if explicitWhere, ok := f.Arguments.Get("where"); ok {
asMap, ok := explicitWhere.(map[string]interface{})
if !ok {
return nil, fmt.Errorf("explicit where fields must be maps, got '%T'", explicitWhere)
}
whereClause = asMap
}
whereJSON, err := json.Marshal(whereClause)
if err != nil {
return nil, err
}
// limit
limit := DefaultLimit
if l, ok := f.Arguments.Get("limit"); ok {
if lim, ok := l.(int); ok {
limit = lim
} else {
return nil, fmt.Errorf("'limit' argument should be an integer. Got %#v", l)
}
}
// order
order := ""
if o, ok := f.Arguments.Get("order"); ok {
if orderStr, ok := o.(string); ok {
order = orderStr
} else {
return nil, fmt.Errorf("'order' argument should be a string. Got %#v", o)
}
}
spew.Dump("ORDER:", order, f.Arguments)
query := &parse.QueryOptions{
Where: string(whereJSON),
Limit: limit,
Order: order,
}
if t, ok := tracer.FromContext(ctx); ok {
t.IncQueries(1)
}
if err := p.client.QueryClass(p.class.ClassName, query, &results); err != nil {
return nil, err
}
typedResults := make([]*ParseClass, 0, len(results))
for _, r := range results {
pc, err := NewParseClass(p.client, p.class.ClassName, p.schema)
if err != nil {
return nil, err
}
pc.Data = r
typedResults = append(typedResults, pc)
}
return typedResults, err
}
func init() {
specialFieldsSet = make(map[string]bool)
for _, f := range specialFields {
specialFieldsSet[f] = true
}
}