lotus/node/modules/chain.go
2019-08-08 19:16:41 +02:00

109 lines
2.9 KiB
Go

package modules
import (
"bytes"
"context"
"github.com/ipfs/go-bitswap"
"github.com/ipfs/go-bitswap/network"
"github.com/ipfs/go-blockservice"
"github.com/ipfs/go-car"
"github.com/ipfs/go-datastore"
blockstore "github.com/ipfs/go-ipfs-blockstore"
"github.com/libp2p/go-libp2p-core/host"
"github.com/libp2p/go-libp2p-core/routing"
"go.uber.org/fx"
"golang.org/x/xerrors"
"github.com/filecoin-project/go-lotus/chain/store"
"github.com/filecoin-project/go-lotus/chain/types"
"github.com/filecoin-project/go-lotus/node/modules/dtypes"
"github.com/filecoin-project/go-lotus/node/modules/helpers"
"github.com/filecoin-project/go-lotus/node/repo"
)
func ChainExchange(mctx helpers.MetricsCtx, lc fx.Lifecycle, host host.Host, rt routing.Routing, bs dtypes.ChainGCBlockstore) dtypes.ChainExchange {
// prefix protocol for chain bitswap
// (so bitswap uses /chain/ipfs/bitswap/1.0.0 internally for chain sync stuff)
bitswapNetwork := network.NewFromIpfsHost(host, rt, network.Prefix("/chain"))
exch := bitswap.New(helpers.LifecycleCtx(mctx, lc), bitswapNetwork, bs)
lc.Append(fx.Hook{
OnStop: func(ctx context.Context) error {
return exch.Close()
},
})
return exch
}
func ChainBlockstore(r repo.LockedRepo) (dtypes.ChainBlockstore, error) {
blocks, err := r.Datastore("/blocks")
if err != nil {
return nil, err
}
bs := blockstore.NewBlockstore(blocks)
return blockstore.NewIdStore(bs), nil
}
func ChainGCBlockstore(bs dtypes.ChainBlockstore, gcl dtypes.ChainGCLocker) dtypes.ChainGCBlockstore {
return blockstore.NewGCBlockstore(bs, gcl)
}
func ChainBlockservice(bs dtypes.ChainBlockstore, rem dtypes.ChainExchange) dtypes.ChainBlockService {
return blockservice.New(bs, rem)
}
func ChainStore(lc fx.Lifecycle, bs dtypes.ChainBlockstore, ds dtypes.MetadataDS) *store.ChainStore {
chain := store.NewChainStore(bs, ds)
if err := chain.Load(); err != nil {
log.Warnf("loading chain state from disk: %s", err)
}
return chain
}
func ErrorGenesis() Genesis {
return func() (header *types.BlockHeader, e error) {
return nil, xerrors.New("No genesis block provided, provide the file with 'lotus daemon --genesis=[genesis file]'")
}
}
func LoadGenesis(genBytes []byte) func(dtypes.ChainBlockstore) Genesis {
return func(bs dtypes.ChainBlockstore) Genesis {
return func() (header *types.BlockHeader, e error) {
c, err := car.LoadCar(bs, bytes.NewReader(genBytes))
if err != nil {
return nil, err
}
if len(c.Roots) != 1 {
return nil, xerrors.New("expected genesis file to have one root")
}
root, err := bs.Get(c.Roots[0])
if err != nil {
return &types.BlockHeader{}, err
}
return types.DecodeBlock(root.RawData())
}
}
}
func SetGenesis(cs *store.ChainStore, g Genesis) error {
_, err := cs.GetGenesis()
if err == nil {
return nil // already set, noop
}
if err != datastore.ErrNotFound {
return err
}
genesis, err := g()
if err != nil {
return err
}
return cs.SetGenesis(genesis)
}