/
factomchain.go
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/
factomchain.go
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// MIT License
//
// Copyright 2018 Canonical Ledgers, LLC
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.
package db
import (
"context"
"fmt"
"os"
"strings"
"time"
"crawshaw.io/sqlite"
"crawshaw.io/sqlite/sqlitex"
"github.com/Factom-Asset-Tokens/factom"
"github.com/Factom-Asset-Tokens/fatd/internal/db/eblock"
"github.com/Factom-Asset-Tokens/fatd/internal/db/metadata"
_log "github.com/Factom-Asset-Tokens/fatd/internal/log"
"github.com/subchen/go-trylock/v2"
)
type FactomChain struct {
ID *factom.Bytes32
Head factom.EBlock
HeadDBKeyMR *factom.Bytes32
NetworkID factom.NetworkID
SyncHeight uint32
SyncDBKeyMR *factom.Bytes32
DBFile string
Conn *sqlite.Conn // Read/Write
Pool *sqlitex.Pool // Read Only Pool
CloseMtx trylock.TryLocker
Log _log.Log
}
func NewFactomChain(ctx context.Context,
dbPath string, chainID *factom.Bytes32,
networkID factom.NetworkID) (_ FactomChain, err error) {
fname := chainID.String() + dbFileExtension
path := dbPath + fname
// Ensure that the database file doesn't already exist.
_, err = os.Stat(path)
if err == nil {
err = fmt.Errorf("already exists: %v", path)
return
}
if !os.IsNotExist(err) { // Any other error is unexpected.
return
}
log := _log.New("chain", strings.TrimRight(fname, dbFileExtension))
conn, pool, err := OpenConnPool(ctx, dbPath+fname)
if err != nil {
err = fmt.Errorf("db.OpenConnPool(): %w", err)
return
}
defer func() {
if err != nil {
Close(conn, pool)
if err := os.Remove(path); err != nil && !os.IsNotExist(err) {
log.Errorf("os.Remove(): %w", err)
}
}
}()
if err = metadata.InsertFactomChain(conn, networkID, chainID); err != nil {
err = fmt.Errorf("db/metadata.InsertFactomChain(): %w", err)
return
}
var zero factom.Bytes32
return FactomChain{
ID: chainID,
NetworkID: networkID,
Head: factom.EBlock{ChainID: chainID, KeyMR: &zero},
SyncDBKeyMR: &zero,
DBFile: fname,
Conn: conn,
Pool: pool,
CloseMtx: trylock.New(),
Log: log,
}, nil
}
func OpenFactomChain(ctx context.Context,
dbPath, fname string) (_ FactomChain, err error) {
log := _log.New("chain", strings.TrimRight(fname, dbFileExtension))
log.Info("Opening...")
conn, pool, err := OpenConnPool(ctx, dbPath+fname)
if err != nil {
return
}
defer func() {
if err != nil {
Close(conn, pool)
}
}()
chain := FactomChain{
DBFile: fname,
Conn: conn,
Pool: pool,
CloseMtx: trylock.New(),
}
if err = chain.load(); err != nil {
return
}
return chain, nil
}
func (chain *FactomChain) load() error {
// Load Chain Head
eb, dbKeyMR, err := eblock.SelectLatest(chain.Conn)
if err != nil {
return err
}
if !eb.IsPopulated() {
// A database must always have at least one EBlock.
return fmt.Errorf("no eblock in database")
}
syncHeight, syncDBKeyMR, networkID, err := metadata.SelectFactomChain(chain.Conn)
if err != nil {
return err
}
chain.ID = eb.ChainID
chain.Head = eb
chain.HeadDBKeyMR = &dbKeyMR
chain.SyncHeight = syncHeight
chain.SyncDBKeyMR = &syncDBKeyMR
chain.NetworkID = networkID
chain.CloseMtx = trylock.New()
return nil
}
// Close all database connections. Log any errors.
func (chain *FactomChain) Close() error {
chain.CloseMtx.Lock()
err := Close(chain.Conn, chain.Pool)
if err != nil {
chain.Log.Error(err)
}
return err
}
func (chain *FactomChain) LatestEntryTimestamp() time.Time {
entries := chain.Head.Entries
lastID := len(entries) - 1
return entries[lastID].Timestamp
}
func (chain *FactomChain) SetSync(height uint32, dbKeyMR *factom.Bytes32) error {
if height <= chain.SyncHeight {
return nil
}
if err := metadata.SetSync(chain.Conn, height, dbKeyMR); err != nil {
return err
}
chain.SyncHeight = height
chain.SyncDBKeyMR = dbKeyMR
return nil
}