/
resolver.go
77 lines (58 loc) · 1.36 KB
/
resolver.go
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//go:generate go run github.com/99designs/gqlgen generate
package graph
import (
"context"
"fmt"
"github.com/99designs/gqlgen/graphql"
"github.com/gnolang/tx-indexer/events"
"github.com/gnolang/tx-indexer/storage"
"github.com/gnolang/tx-indexer/types"
)
// This file will not be regenerated automatically.
//
// It serves as dependency injection for your app, add any dependencies you require here.
const maxElementsPerQuery = 10000
func deref[T any](v *T) T {
if v == nil {
var zero T
return zero
}
return *v
}
func handleChannel[T any](
ctx context.Context,
m *events.Manager,
writeToChannel func(*types.NewBlock, chan<- T),
) <-chan T {
ch := make(chan T)
go func() {
defer close(ch)
sub := m.Subscribe([]events.Type{types.NewBlockEvent})
defer m.CancelSubscription(sub.ID)
for {
select {
case <-ctx.Done():
graphql.AddError(ctx, ctx.Err())
return
case rawE, ok := <-sub.SubCh:
if !ok {
return
}
e, ok := rawE.GetData().(*types.NewBlock)
if !ok {
graphql.AddError(ctx, fmt.Errorf("error casting event data. Obtained event ID: %q", rawE.GetType()))
return
}
writeToChannel(e, ch)
}
}
}()
return ch
}
type Resolver struct {
store storage.Storage
manager *events.Manager
}
func NewResolver(s storage.Storage, m *events.Manager) *Resolver {
return &Resolver{store: s, manager: m}
}