lotus/chain/actors/builtin/datacap/util.go

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package datacap
import (
"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/go-state-types/big"
"github.com/filecoin-project/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/actors/adt"
)
// taking this as a function instead of asking the caller to call it helps reduce some of the error
// checking boilerplate.
//
// "go made me do it"
type rootFunc func() (adt.Map, error)
func getDataCap(store adt.Store, ver actors.Version, root rootFunc, addr address.Address) (bool, abi.StoragePower, error) {
if addr.Protocol() != address.ID {
return false, big.Zero(), xerrors.Errorf("can only look up ID addresses")
}
vh, err := root()
if err != nil {
return false, big.Zero(), xerrors.Errorf("loading datacap actor: %w", err)
}
var dcap abi.StoragePower
if found, err := vh.Get(abi.AddrKey(addr), &dcap); err != nil {
return false, big.Zero(), xerrors.Errorf("looking up addr: %w", err)
} else if !found {
return false, big.Zero(), nil
}
return true, dcap, nil
}
func forEachCap(store adt.Store, ver actors.Version, root rootFunc, cb func(addr address.Address, dcap abi.StoragePower) error) error {
vh, err := root()
if err != nil {
return xerrors.Errorf("loading verified clients: %w", err)
}
var dcap abi.StoragePower
return vh.ForEach(&dcap, func(key string) error {
a, err := address.NewFromBytes([]byte(key))
if err != nil {
return err
}
return cb(a, dcap)
})
}