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utils.go
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/
utils.go
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package api
import (
"context"
"fmt"
"github.com/elysiumstation/fury/datanode/entities"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc/codes"
"google.golang.org/protobuf/proto"
)
func toProtos[T proto.Message, V entities.ProtoEntity[T]](inputs []V) []T {
protos := make([]T, 0, len(inputs))
for _, input := range inputs {
proto := input.ToProto()
protos = append(protos, proto)
}
return protos
}
func mapSlice[T proto.Message, V any](inputs []V, toProto func(V) (T, error)) ([]T, error) {
protos := make([]T, 0, len(inputs))
for _, input := range inputs {
proto, err := toProto(input)
if err != nil {
return nil, fmt.Errorf("failed to convert to proto: %w", err)
}
protos = append(protos, proto)
}
return protos, nil
}
// queryProtoEntities invokes queryFunc and converts the entity to protos.
func queryProtoEntities[T proto.Message, E entities.ProtoEntity[T]](
ctx context.Context, eg *errgroup.Group, txHash entities.TxHash,
queryFunc func(ctx context.Context, txHash entities.TxHash) ([]E, error),
apiErr error,
) chan []T {
outChan := make(chan []T, 1)
eg.Go(func() error {
items, err := queryFunc(ctx, txHash)
if err != nil {
return apiError(codes.Internal, apiErr, err)
}
outChan <- toProtos[T](items)
return nil
})
return outChan
}
type mapableEntities interface {
entities.Entities | entities.LedgerEntry | entities.Transfer | entities.MarginLevels
}
// queryAndMapEntities invokes queryFunc and maps every single entity with mapFunc.
func queryAndMapEntities[T proto.Message, E mapableEntities](
ctx context.Context, eg *errgroup.Group, txHash entities.TxHash,
queryFunc func(context.Context, entities.TxHash) ([]E, error),
mapFunc func(E) (T, error),
apiErr error,
) chan []T {
outChan := make(chan []T, 1)
eg.Go(func() error {
items, err := queryFunc(ctx, txHash)
if err != nil {
return apiError(codes.Internal, apiErr, err)
}
mapped, err := mapSlice(items, mapFunc)
if err != nil {
return apiError(codes.Internal, apiErr, err)
}
outChan <- mapped
return nil
})
return outChan
}