83 lines
2.5 KiB
Go
83 lines
2.5 KiB
Go
package graphvent
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import (
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"time"
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"reflect"
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"github.com/graphql-go/graphql"
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"github.com/graphql-go/graphql/language/ast"
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"github.com/google/uuid"
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)
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func GetFieldNames(ctx *Context, 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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names = append(names, field.Name.Value)
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case *ast.InlineFragment:
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names = append(names, GetFieldNames(ctx, field.SelectionSet)...)
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default:
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ctx.Log.Logf("gql", "Unknown selection type: %s", reflect.TypeOf(field))
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}
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}
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return names
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}
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func GetResolveFields(ctx *Context, p graphql.ResolveParams) []string {
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names := []string{}
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for _, field := range(p.Info.FieldASTs) {
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names = append(names, GetFieldNames(ctx, field.SelectionSet)...)
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}
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return names
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}
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func ResolveNodes(ctx *ResolveContext, p graphql.ResolveParams, ids []NodeID) ([]NodeResult, error) {
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fields := GetResolveFields(ctx.Context, p)
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ctx.Context.Log.Logf("gql", "RESOLVE_NODES(%+v): %+v", ids, fields)
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resp_channels := map[uuid.UUID]chan Signal{}
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node_ids := map[uuid.UUID]NodeID{}
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for _, id := range(ids) {
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// Get a list of fields that will be written
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ext_fields, err := ctx.GQLContext.GetACLFields(p.Info.FieldName, fields)
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if err != nil {
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return nil, err
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}
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// Create a read signal, send it to the specified node, and add the wait to the response map if the send returns no error
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read_signal := NewReadSignal(ext_fields)
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msgs := Messages{}
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msgs = msgs.Add(ctx.Context, ctx.Server.ID, ctx.Key, read_signal, id)
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response_chan := ctx.Ext.GetResponseChannel(read_signal.ID)
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resp_channels[read_signal.ID] = response_chan
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node_ids[read_signal.ID] = id
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// TODO: Send all at once instead of creating Messages for each
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err = ctx.Context.Send(msgs)
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if err != nil {
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ctx.Ext.FreeResponseChannel(read_signal.ID)
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return nil, err
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}
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}
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responses := []NodeResult{}
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for sig_id, response_chan := range(resp_channels) {
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// Wait for the response, returning an error on timeout
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response, err := WaitForSignal(response_chan, time.Millisecond*100, func(sig *ReadResultSignal)bool{
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return sig.ReqID == sig_id
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})
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if err != nil {
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return nil, err
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}
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responses = append(responses, NodeResult{node_ids[sig_id], response})
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}
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ctx.Context.Log.Logf("gql", "RESOLVED_NODES")
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return responses, nil
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}
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