txdatabase.go

// Copyright 2016 Factom Foundation
// Use of this source code is governed by the MIT
// license that can be found in the LICENSE file.

package wallet

import (
	"encoding/hex"
	"fmt"
	"os"

	"github.com/FactomProject/factom"
	"github.com/FactomProject/factomd/common/directoryBlock"
	"github.com/FactomProject/factomd/common/factoid"
	"github.com/FactomProject/factomd/common/interfaces"
	"github.com/FactomProject/factomd/common/primitives"
	"github.com/FactomProject/factomd/database/databaseOverlay"
	"github.com/FactomProject/factomd/database/hybridDB"
	"github.com/FactomProject/factomd/database/mapdb"
)

// Database keys and key prefixes
var (
	fblockDBPrefix = []byte("FBlock")
)

type TXDatabaseOverlay struct {
	DBO databaseOverlay.Overlay

	// To indicate to sub processes to quit
	quit bool
}

func NewTXOverlay(db interfaces.IDatabase) *TXDatabaseOverlay {
	answer := new(TXDatabaseOverlay)
	answer.DBO.DB = db
	return answer
}

func NewTXMapDB() *TXDatabaseOverlay {
	return NewTXOverlay(new(mapdb.MapDB))
}

func NewTXLevelDB(ldbpath string) (*TXDatabaseOverlay, error) {
	db, err := hybridDB.NewLevelMapHybridDB(ldbpath, false)
	if err != nil {
		fmt.Printf("err opening transaction db: %v\n", err)
	}

	if db == nil {
		fmt.Println("Creating new transaction db ...")
		db, err = hybridDB.NewLevelMapHybridDB(ldbpath, true)

		if err != nil {
			return nil, err
		}
	}
	fmt.Println("Transaction database started from: " + ldbpath)
	return NewTXOverlay(db), nil
}

func NewTXBoltDB(boltPath string) (*TXDatabaseOverlay, error) {
	fileInfo, err := os.Stat(boltPath)
	if err == nil {
		if fileInfo.IsDir() {
			return nil, fmt.Errorf("%s is not a Bolt databse file", boltPath)
		}
	}
	if err != nil && !os.IsNotExist(err) {
		fmt.Printf("database error %s\n", err)
		return nil, err
	}

	defer func() {
		if r := recover(); r != nil {
			fmt.Printf("Could not use wallet cache database file \"%s\"\n%v\n", boltPath, r)
			os.Exit(1)
		}
	}()
	db := hybridDB.NewBoltMapHybridDB(nil, boltPath)

	fmt.Println("Database started from: " + boltPath)
	return NewTXOverlay(db), nil
}

func (db *TXDatabaseOverlay) Close() error {
	db.quit = true
	return db.DBO.Close()
}

// GetAllTXs returns a list of all transactions in the history of Factom. A
// local database is used to cache the factoid blocks.
func (db *TXDatabaseOverlay) GetAllTXs() ([]interfaces.ITransaction, error) {
	// update the database and get the newest fblock
	_, err := db.update()
	if err != nil {
		return nil, err
	}
	fblock, err := db.DBO.FetchFBlockHead()
	if err != nil {
		return nil, err
	}
	if fblock == nil {
		return nil, fmt.Errorf("FBlock Chain has not finished syncing")
	}
	txs := make([]interfaces.ITransaction, 0)

	for {
		// get all of the txs from the block
		height := fblock.GetDatabaseHeight()
		for _, tx := range fblock.GetTransactions() {
			ins, err := tx.TotalInputs()
			if err != nil {
				return nil, err
			}
			outs, err := tx.TotalOutputs()
			if err != nil {
				return nil, err
			}

			if ins != 0 || outs != 0 {
				tx.SetBlockHeight(height)
				txs = append(txs, tx)
			}
		}

		if pre := fblock.GetPrevKeyMR().String(); pre != factom.ZeroHash {
			// get the previous block
			fblock, err = db.GetFBlock(pre)
			if err != nil {
				return nil, err
			} else if fblock == nil {
				return nil, fmt.Errorf("Missing fblock in database: %s", pre)
			}
		} else {
			break
		}
	}

	return txs, nil
}

// GetTX gets a transaction by the transaction id
func (db *TXDatabaseOverlay) GetTX(txid string) (interfaces.ITransaction, error) {
	txs, err := db.GetAllTXs()
	if err != nil {
		return nil, err
	}

	for _, tx := range txs {
		if tx.GetSigHash().String() == txid {
			return tx, nil
		}
	}

	return nil, fmt.Errorf("Transaction not found")
}

// GetTXAddress returns a list of all transactions in the history of Factom that
// include a specific address.
func (db *TXDatabaseOverlay) GetTXAddress(adr string) (
	[]interfaces.ITransaction, error) {
	filtered := make([]interfaces.ITransaction, 0)

	txs, err := db.GetAllTXs()
	if err != nil {
		return nil, err
	}

	if factom.AddressStringType(adr) == factom.FactoidPub {
		for _, tx := range txs {
			for _, in := range tx.GetInputs() {
				if primitives.ConvertFctAddressToUserStr(in.GetAddress()) == adr {
					filtered = append(filtered, tx)
				}
			}
			for _, out := range tx.GetOutputs() {
				if primitives.ConvertFctAddressToUserStr(out.GetAddress()) == adr {
					filtered = append(filtered, tx)
				}
			}
		}
	} else if factom.AddressStringType(adr) == factom.ECPub {
		for _, tx := range txs {
			for _, out := range tx.GetECOutputs() {
				if primitives.ConvertECAddressToUserStr(out.GetAddress()) == adr {
					filtered = append(filtered, tx)
				}
			}
		}
	} else {
		return nil, fmt.Errorf("not a valid address")
	}

	return filtered, nil
}

func (db *TXDatabaseOverlay) GetTXRange(start, end int) (
	[]interfaces.ITransaction, error) {
	if start < 0 || end < 0 {
		return nil, fmt.Errorf("Range cannot have negative numbers")
	}
	s, e := uint32(start), uint32(end)

	filtered := make([]interfaces.ITransaction, 0)

	txs, err := db.GetAllTXs()
	if err != nil {
		return nil, err
	}

	for _, tx := range txs {
		if s <= tx.GetBlockHeight() && tx.GetBlockHeight() <= e {
			filtered = append(filtered, tx)
		}
	}

	return filtered, nil
}

// GetFBlock retrives a Factoid Block from Factom
func (db *TXDatabaseOverlay) GetFBlock(keymr string) (interfaces.IFBlock, error) {
	h, err := primitives.NewShaHashFromStr(keymr)
	if err != nil {
		return nil, err
	}

	fBlock, err := db.DBO.FetchFBlock(h)
	if err != nil {
		return nil, err
	}
	return fBlock, nil
}

func (db *TXDatabaseOverlay) FetchNextFBlockHeight() (uint32, error) {
	block, err := db.DBO.FetchFBlockHead()
	if err != nil {
		return 0, err
	}
	if block == nil {
		return 0, nil
	}
	return block.GetDBHeight() + 1, nil
}

func (db *TXDatabaseOverlay) InsertFBlockHead(fblock interfaces.IFBlock) error {
	return db.DBO.SaveFactoidBlockHead(fblock)
}

// update gets all fblocks written since the database was last updated, and
// returns the most recent fblock keymr.
func (db *TXDatabaseOverlay) update() (string, error) {
	newestFBlock, err := fblockHead()
	if err != nil {
		return "", err
	}

	start, err := db.FetchNextFBlockHeight()
	if err != nil {
		return "", err
	}

	// Make sure we didn't switch networks
	genesis, err := db.DBO.FetchFBlockByHeight(0)
	if err != nil {
		return "", err
	}
	if genesis != nil {
		genesis2, err := getdblockbyheight(0)
		if err != nil {
			return "", err
		}

		var gensisFBlockKeyMr interfaces.IHash
		for _, e := range genesis2.GetDBEntries() {
			if e.GetChainID().String() == "000000000000000000000000000000000000000000000000000000000000000f" {
				gensisFBlockKeyMr = e.GetKeyMR()
				break
			}
		}

		if gensisFBlockKeyMr == nil {
			return "", fmt.Errorf("unable to fetch the genesis block via the api")
		}

		if !gensisFBlockKeyMr.IsSameAs(genesis.GetKeyMR()) {
			start = 0
		}
	}

	newestHeight := newestFBlock.GetDatabaseHeight()

	// If the newest block in the tx cashe has a greater height than the newest
	// fblock then clear the cashe and start from 0.
	if start >= newestHeight {
		return newestFBlock.GetKeyMR().String(), nil
	}

	db.DBO.StartMultiBatch()
	for i := start; i <= newestHeight; i++ {
		if i%1000 == 0 {
			if newestHeight-start > 1000 {
				fmt.Printf("Fetching block %v/%v\n", i, newestHeight)
			}
		}
		fblock, err := getfblockbyheight(i)
		if err != nil {
			db.DBO.ExecuteMultiBatch()
			return "", err
		}
		db.DBO.ProcessFBlockMultiBatch(fblock)

		// Save to DB every 500 blocks
		if i%500 == 0 {
			db.DBO.ExecuteMultiBatch()
			db.DBO.StartMultiBatch()
		}

		// If the wallet is stopped, this process becomes hard to kill. Have it exit
		if db.quit {
			break
		}
	}

	if !db.quit {
		fmt.Printf("Fetching block %v/%v\n", newestHeight, newestHeight)
	}

	// Save the remaining blocks
	if err = db.DBO.ExecuteMultiBatch(); err != nil {
		return "", err
	}

	return newestFBlock.GetKeyMR().String(), nil
}

// fblockHead gets the most recent fblock.
func fblockHead() (interfaces.IFBlock, error) {
	fblockID := "000000000000000000000000000000000000000000000000000000000000000f"

	dbhead, err := factom.GetDBlockHead()
	if err != nil {
		return nil, err
	}
	dblock, err := factom.GetDBlock(dbhead)
	if err != nil {
		return nil, err
	}

	var fblockmr string
	for _, eblock := range dblock.EntryBlockList {
		if eblock.ChainID == fblockID {
			fblockmr = eblock.KeyMR
		}
	}
	if fblockmr == "" {
		return nil, err
	}

	return getfblock(fblockmr)
}

func getfblock(keymr string) (interfaces.IFBlock, error) {
	p, err := factom.GetRaw(keymr)
	if err != nil {
		return nil, err
	}
	return factoid.UnmarshalFBlock(p)
}

func getfblockbyheight(height uint32) (interfaces.IFBlock, error) {
	p, err := factom.GetFBlockByHeight(int64(height))
	if err != nil {
		return nil, err
	}
	h, err := hex.DecodeString(p.RawData)
	if err != nil {
		return nil, err
	}
	return factoid.UnmarshalFBlock(h)
}

func getdblockbyheight(height uint32) (interfaces.IDirectoryBlock, error) {
	p, err := factom.GetDBlockByHeight(int64(height))
	if err != nil {
		return nil, err
	}
	h, err := hex.DecodeString(p.RawData)
	if err != nil {
		return nil, err
	}
	return directoryBlock.UnmarshalDBlock(h)
}