91 lines
2.2 KiB
Go
91 lines
2.2 KiB
Go
// Copyright (c) 2015-2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package main
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import (
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"encoding/hex"
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"errors"
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"strconv"
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"time"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/btcsuite/btcd/database"
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)
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// blockRegionCmd defines the configuration options for the fetchblockregion
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// command.
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type blockRegionCmd struct{}
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var (
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// blockRegionCfg defines the configuration options for the command.
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blockRegionCfg = blockRegionCmd{}
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)
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// Execute is the main entry point for the command. It's invoked by the parser.
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func (cmd *blockRegionCmd) Execute(args []string) error {
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// Setup the global config options and ensure they are valid.
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if err := setupGlobalConfig(); err != nil {
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return err
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}
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// Ensure expected arguments.
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if len(args) < 1 {
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return errors.New("required block hash parameter not specified")
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}
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if len(args) < 2 {
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return errors.New("required start offset parameter not " +
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"specified")
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}
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if len(args) < 3 {
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return errors.New("required region length parameter not " +
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"specified")
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}
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// Parse arguments.
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blockHash, err := chainhash.NewHashFromStr(args[0])
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if err != nil {
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return err
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}
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startOffset, err := strconv.ParseUint(args[1], 10, 32)
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if err != nil {
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return err
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}
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regionLen, err := strconv.ParseUint(args[2], 10, 32)
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if err != nil {
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return err
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}
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// Load the block database.
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db, err := loadBlockDB()
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if err != nil {
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return err
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}
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defer db.Close()
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return db.View(func(tx database.Tx) error {
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log.Infof("Fetching block region %s<%d:%d>", blockHash,
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startOffset, startOffset+regionLen-1)
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region := database.BlockRegion{
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Hash: blockHash,
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Offset: uint32(startOffset),
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Len: uint32(regionLen),
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}
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startTime := time.Now()
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regionBytes, err := tx.FetchBlockRegion(®ion)
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if err != nil {
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return err
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}
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log.Infof("Loaded block region in %v", time.Since(startTime))
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log.Infof("Double Hash: %s", chainhash.DoubleHashH(regionBytes))
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log.Infof("Region Hex: %s", hex.EncodeToString(regionBytes))
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return nil
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})
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}
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// Usage overrides the usage display for the command.
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func (cmd *blockRegionCmd) Usage() string {
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return "<block-hash> <start-offset> <length-of-region>"
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}
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