99 lines
3.3 KiB
Go
99 lines
3.3 KiB
Go
// Copyright (c) 2013 Conformal Systems LLC.
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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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"fmt"
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"github.com/conformal/go-flags"
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"os"
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"path/filepath"
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)
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const (
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minCandidates = 1
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maxCandidates = 20
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defaultNumCandidates = 5
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)
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var (
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defaultDataDir = filepath.Join(btcdHomeDir(), "data")
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)
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// config defines the configuration options for findcheckpoint.
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//
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// See loadConfig for details on the configuration load process.
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type config struct {
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DataDir string `short:"b" long:"datadir" description:"Location of the btcd data directory"`
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NumCandidates int `short:"n" long:"numcandidates" description:"Max num of checkpoint candidates to show {1-20}"`
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UseGoOutput bool `short:"g" long:"gooutput" description:"Display the candidates using Go syntax that is ready to insert into the btcchain checkpoint list"`
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}
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// btcdHomeDir returns an OS appropriate home directory for btcd.
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func btcdHomeDir() string {
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// Search for Windows APPDATA first. This won't exist on POSIX OSes.
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appData := os.Getenv("APPDATA")
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if appData != "" {
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return filepath.Join(appData, "btcd")
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}
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// Fall back to standard HOME directory that works for most POSIX OSes.
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home := os.Getenv("HOME")
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if home != "" {
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return filepath.Join(home, ".btcd")
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}
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// In the worst case, use the current directory.
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return "."
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}
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// loadConfig initializes and parses the config using command line options.
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//
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// The configuration proceeds as follows:
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// 1) Start with a default config with sane settings
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// 2) Pre-parse the command line to check for an alternative config file
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// 3) Load configuration file overwriting defaults with any specified options
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// 4) Parse CLI options and overwrite/add any specified options
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//
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// The above results in btcd functioning properly without any config settings
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// while still allowing the user to override settings with config files and
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// command line options. Command line options always take precedence.
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func loadConfig() (*config, []string, error) {
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// Default config.
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cfg := config{
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DataDir: defaultDataDir,
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NumCandidates: defaultNumCandidates,
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}
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// Parse command line options.
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parser := flags.NewParser(&cfg, flags.Default)
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remainingArgs, err := parser.Parse()
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if err != nil {
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if e, ok := err.(*flags.Error); !ok || e.Type != flags.ErrHelp {
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parser.WriteHelp(os.Stderr)
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}
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return nil, nil, err
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}
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// Validate the number of candidates.
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if cfg.NumCandidates < minCandidates || cfg.NumCandidates > maxCandidates {
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str := "%s: The specified number of candidates is out of " +
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"range -- parsed [%v]"
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err = fmt.Errorf(str, "loadConfig", cfg.NumCandidates)
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fmt.Fprintln(os.Stderr, err)
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parser.WriteHelp(os.Stderr)
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return nil, nil, err
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}
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// Append the network type to the data directory so it is "namespaced"
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// per network. In addition to the block database, there are other
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// pieces of data that are saved to disk such as address manager state.
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// All data is specific to a network, so namespacing the data directory
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// means each individual piece of serialized data does not have to
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// worry about changing names per network and such.
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//cfg.DataDir = cleanAndExpandPath(cfg.DataDir)
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cfg.DataDir = filepath.Join(cfg.DataDir, "mainnet")
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return &cfg, remainingArgs, nil
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}
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