52ed3570c4
This change updates our urfave/cli dependency to the v2 branch of the library. There are some Go API changes in cli v2: - Flag values can now be accessed using the methods ctx.Bool, ctx.Int, ctx.String, ... regardless of whether the flag is 'local' or 'global'. - v2 has built-in support for flag categories. Our home-grown category system is removed and the categories of flags are assigned as part of the flag definition. For users, there is only one observable difference with cli v2: flags must now strictly appear before regular arguments. For example, the following command is now invalid: geth account import mykey.json --password file.txt Instead, the command must be invoked as follows: geth account import --password file.txt mykey.json
341 lines
8.3 KiB
Go
341 lines
8.3 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package flags
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import (
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"encoding"
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"errors"
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"flag"
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"math/big"
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"os"
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"os/user"
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"path"
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"strings"
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"github.com/ethereum/go-ethereum/common/math"
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"github.com/urfave/cli/v2"
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)
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// DirectoryString is custom type which is registered in the flags library which cli uses for
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// argument parsing. This allows us to expand Value to an absolute path when
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// the argument is parsed
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type DirectoryString string
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func (s *DirectoryString) String() string {
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return string(*s)
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}
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func (s *DirectoryString) Set(value string) error {
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*s = DirectoryString(expandPath(value))
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return nil
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}
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var (
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_ cli.Flag = (*DirectoryFlag)(nil)
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_ cli.RequiredFlag = (*DirectoryFlag)(nil)
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_ cli.VisibleFlag = (*DirectoryFlag)(nil)
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_ cli.DocGenerationFlag = (*DirectoryFlag)(nil)
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_ cli.CategorizableFlag = (*DirectoryFlag)(nil)
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)
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// DirectoryFlag is custom cli.Flag type which expand the received string to an absolute path.
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// e.g. ~/.ethereum -> /home/username/.ethereum
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type DirectoryFlag struct {
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Name string
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Category string
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DefaultText string
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Usage string
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Required bool
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Hidden bool
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HasBeenSet bool
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Value DirectoryString
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Aliases []string
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}
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// For cli.Flag:
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func (f *DirectoryFlag) Names() []string { return append([]string{f.Name}, f.Aliases...) }
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func (f *DirectoryFlag) IsSet() bool { return f.HasBeenSet }
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func (f *DirectoryFlag) String() string { return cli.FlagStringer(f) }
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// Apply called by cli library, grabs variable from environment (if in env)
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// and adds variable to flag set for parsing.
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func (f *DirectoryFlag) Apply(set *flag.FlagSet) error {
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eachName(f, func(name string) {
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set.Var(&f.Value, f.Name, f.Usage)
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})
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return nil
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}
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// For cli.RequiredFlag:
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func (f *DirectoryFlag) IsRequired() bool { return f.Required }
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// For cli.VisibleFlag:
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func (f *DirectoryFlag) IsVisible() bool { return !f.Hidden }
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// For cli.CategorizableFlag:
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func (f *DirectoryFlag) GetCategory() string { return f.Category }
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// For cli.DocGenerationFlag:
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func (f *DirectoryFlag) TakesValue() bool { return true }
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func (f *DirectoryFlag) GetUsage() string { return f.Usage }
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func (f *DirectoryFlag) GetValue() string { return f.Value.String() }
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func (f *DirectoryFlag) GetEnvVars() []string { return nil } // env not supported
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func (f *DirectoryFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return f.GetValue()
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}
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type TextMarshaler interface {
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encoding.TextMarshaler
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encoding.TextUnmarshaler
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}
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// textMarshalerVal turns a TextMarshaler into a flag.Value
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type textMarshalerVal struct {
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v TextMarshaler
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}
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func (v textMarshalerVal) String() string {
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if v.v == nil {
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return ""
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}
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text, _ := v.v.MarshalText()
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return string(text)
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}
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func (v textMarshalerVal) Set(s string) error {
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return v.v.UnmarshalText([]byte(s))
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}
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var (
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_ cli.Flag = (*TextMarshalerFlag)(nil)
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_ cli.RequiredFlag = (*TextMarshalerFlag)(nil)
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_ cli.VisibleFlag = (*TextMarshalerFlag)(nil)
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_ cli.DocGenerationFlag = (*TextMarshalerFlag)(nil)
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_ cli.CategorizableFlag = (*TextMarshalerFlag)(nil)
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)
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// TextMarshalerFlag wraps a TextMarshaler value.
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type TextMarshalerFlag struct {
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Name string
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Category string
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DefaultText string
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Usage string
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Required bool
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Hidden bool
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HasBeenSet bool
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Value TextMarshaler
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Aliases []string
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}
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// For cli.Flag:
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func (f *TextMarshalerFlag) Names() []string { return append([]string{f.Name}, f.Aliases...) }
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func (f *TextMarshalerFlag) IsSet() bool { return f.HasBeenSet }
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func (f *TextMarshalerFlag) String() string { return cli.FlagStringer(f) }
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func (f *TextMarshalerFlag) Apply(set *flag.FlagSet) error {
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eachName(f, func(name string) {
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set.Var(textMarshalerVal{f.Value}, f.Name, f.Usage)
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})
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return nil
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}
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// For cli.RequiredFlag:
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func (f *TextMarshalerFlag) IsRequired() bool { return f.Required }
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// For cli.VisibleFlag:
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func (f *TextMarshalerFlag) IsVisible() bool { return !f.Hidden }
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// For cli.CategorizableFlag:
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func (f *TextMarshalerFlag) GetCategory() string { return f.Category }
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// For cli.DocGenerationFlag:
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func (f *TextMarshalerFlag) TakesValue() bool { return true }
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func (f *TextMarshalerFlag) GetUsage() string { return f.Usage }
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func (f *TextMarshalerFlag) GetEnvVars() []string { return nil } // env not supported
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func (f *TextMarshalerFlag) GetValue() string {
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t, err := f.Value.MarshalText()
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if err != nil {
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return "(ERR: " + err.Error() + ")"
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}
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return string(t)
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}
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func (f *TextMarshalerFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return f.GetValue()
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}
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// GlobalTextMarshaler returns the value of a TextMarshalerFlag from the global flag set.
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func GlobalTextMarshaler(ctx *cli.Context, name string) TextMarshaler {
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val := ctx.Generic(name)
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if val == nil {
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return nil
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}
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return val.(textMarshalerVal).v
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}
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var (
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_ cli.Flag = (*BigFlag)(nil)
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_ cli.RequiredFlag = (*BigFlag)(nil)
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_ cli.VisibleFlag = (*BigFlag)(nil)
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_ cli.DocGenerationFlag = (*BigFlag)(nil)
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_ cli.CategorizableFlag = (*BigFlag)(nil)
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)
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// BigFlag is a command line flag that accepts 256 bit big integers in decimal or
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// hexadecimal syntax.
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type BigFlag struct {
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Name string
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Category string
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DefaultText string
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Usage string
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Required bool
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Hidden bool
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HasBeenSet bool
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Value *big.Int
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Aliases []string
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}
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// For cli.Flag:
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func (f *BigFlag) Names() []string { return append([]string{f.Name}, f.Aliases...) }
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func (f *BigFlag) IsSet() bool { return f.HasBeenSet }
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func (f *BigFlag) String() string { return cli.FlagStringer(f) }
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func (f *BigFlag) Apply(set *flag.FlagSet) error {
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eachName(f, func(name string) {
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f.Value = new(big.Int)
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set.Var((*bigValue)(f.Value), f.Name, f.Usage)
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})
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return nil
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}
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// For cli.RequiredFlag:
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func (f *BigFlag) IsRequired() bool { return f.Required }
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// For cli.VisibleFlag:
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func (f *BigFlag) IsVisible() bool { return !f.Hidden }
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// For cli.CategorizableFlag:
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func (f *BigFlag) GetCategory() string { return f.Category }
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// For cli.DocGenerationFlag:
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func (f *BigFlag) TakesValue() bool { return true }
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func (f *BigFlag) GetUsage() string { return f.Usage }
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func (f *BigFlag) GetValue() string { return f.Value.String() }
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func (f *BigFlag) GetEnvVars() []string { return nil } // env not supported
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func (f *BigFlag) GetDefaultText() string {
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if f.DefaultText != "" {
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return f.DefaultText
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}
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return f.GetValue()
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}
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// bigValue turns *big.Int into a flag.Value
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type bigValue big.Int
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func (b *bigValue) String() string {
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if b == nil {
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return ""
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}
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return (*big.Int)(b).String()
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}
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func (b *bigValue) Set(s string) error {
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intVal, ok := math.ParseBig256(s)
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if !ok {
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return errors.New("invalid integer syntax")
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}
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*b = (bigValue)(*intVal)
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return nil
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}
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// GlobalBig returns the value of a BigFlag from the global flag set.
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func GlobalBig(ctx *cli.Context, name string) *big.Int {
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val := ctx.Generic(name)
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if val == nil {
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return nil
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}
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return (*big.Int)(val.(*bigValue))
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}
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// Expands a file path
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// 1. replace tilde with users home dir
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// 2. expands embedded environment variables
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// 3. cleans the path, e.g. /a/b/../c -> /a/c
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// Note, it has limitations, e.g. ~someuser/tmp will not be expanded
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func expandPath(p string) string {
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if strings.HasPrefix(p, "~/") || strings.HasPrefix(p, "~\\") {
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if home := HomeDir(); home != "" {
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p = home + p[1:]
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}
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}
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return path.Clean(os.ExpandEnv(p))
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}
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func HomeDir() string {
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if home := os.Getenv("HOME"); home != "" {
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return home
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}
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if usr, err := user.Current(); err == nil {
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return usr.HomeDir
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}
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return ""
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}
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func eachName(f cli.Flag, fn func(string)) {
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for _, name := range f.Names() {
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name = strings.Trim(name, " ")
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fn(name)
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}
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}
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