148 lines
3.6 KiB
Go
148 lines
3.6 KiB
Go
package graphvent
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import (
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"reflect"
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"fmt"
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"time"
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"github.com/graphql-go/graphql"
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"github.com/graphql-go/graphql/language/ast"
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)
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func ResolveNodeID(p graphql.ResolveParams) (interface{}, error) {
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node, ok := p.Source.(NodeResult)
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if ok == false {
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return nil, fmt.Errorf("Can't get NodeID from %+v", reflect.TypeOf(p.Source))
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}
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return node.NodeID, nil
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}
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func ResolveNodeType(p graphql.ResolveParams) (interface{}, error) {
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node, ok := p.Source.(NodeResult)
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if ok == false {
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return nil, fmt.Errorf("Can't get TypeHash from %+v", reflect.TypeOf(p.Source))
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}
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return uint64(node.NodeType), nil
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}
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type FieldIndex struct {
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Extension ExtType
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Tag string
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}
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func GetFields(selection_set *ast.SelectionSet) []string {
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names := []string{}
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if selection_set == nil {
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return names
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}
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for _, sel := range(selection_set.Selections) {
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switch field := sel.(type) {
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case *ast.Field:
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if field.Name.Value == "ID" || field.Name.Value == "Type" {
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continue
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}
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names = append(names, field.Name.Value)
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case *ast.InlineFragment:
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names = append(names, GetFields(field.SelectionSet)...)
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}
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}
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return names
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}
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// Returns the fields that need to be resolved
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func GetResolveFields(p graphql.ResolveParams) []string {
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fields := []string{}
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for _, field := range(p.Info.FieldASTs) {
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fields = append(fields, GetFields(field.SelectionSet)...)
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}
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return fields
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}
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func ResolveNode(id NodeID, p graphql.ResolveParams) (NodeResult, error) {
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ctx, err := PrepResolve(p)
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if err != nil {
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return NodeResult{}, err
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}
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switch source := p.Source.(type) {
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case *StatusSignal:
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cached_node, cached := ctx.NodeCache[source.Source]
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if cached {
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for _, field_name := range(source.Fields) {
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_, cached := cached_node.Data[field_name]
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if cached {
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delete(cached_node.Data, field_name)
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}
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}
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ctx.NodeCache[source.Source] = cached_node
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}
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}
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cache, node_cached := ctx.NodeCache[id]
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fields := GetResolveFields(p)
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var not_cached []string
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if node_cached {
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not_cached = []string{}
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for _, field := range(fields) {
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if node_cached {
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_, field_cached := cache.Data[field]
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if field_cached {
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continue
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}
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}
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not_cached = append(not_cached, field)
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}
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} else {
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not_cached = fields
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}
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if (len(not_cached) == 0) && (node_cached == true) {
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ctx.Context.Log.Logf("gql", "No new fields to resolve for %s", id)
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return cache, nil
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} else {
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ctx.Context.Log.Logf("gql", "Resolving fields %+v on node %s", not_cached, id)
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signal := NewReadSignal(not_cached)
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response_chan := ctx.Ext.GetResponseChannel(signal.ID())
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// TODO: TIMEOUT DURATION
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err = ctx.Context.Send(ctx.Server, []SendMsg{{
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Dest: id,
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Signal: signal,
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}})
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if err != nil {
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ctx.Ext.FreeResponseChannel(signal.ID())
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return NodeResult{}, err
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}
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response, _, err := WaitForResponse(response_chan, 100*time.Millisecond, signal.ID())
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ctx.Ext.FreeResponseChannel(signal.ID())
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if err != nil {
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return NodeResult{}, err
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}
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switch response := response.(type) {
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case *ReadResultSignal:
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if node_cached == false {
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cache = NodeResult{
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NodeID: id,
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NodeType: response.NodeType,
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Data: response.Fields,
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}
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} else {
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for field_name, field_value := range(response.Fields) {
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cache.Data[field_name] = field_value
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}
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}
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ctx.NodeCache[id] = cache
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return ctx.NodeCache[id], nil
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default:
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return NodeResult{}, fmt.Errorf("Bad read response: %+v", response)
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}
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}
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}
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