94 lines
2.2 KiB
Go
94 lines
2.2 KiB
Go
package main
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import (
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"encoding/hex"
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"flag"
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"fmt"
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"os"
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"strings"
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maddr "github.com/multiformats/go-multiaddr"
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)
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var (
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flagHelp bool
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)
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func main() {
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flag.Usage = func() {
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usage := `usage: %s [options] ADDR
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Print details about the given multiaddr.
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Options:
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`
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fmt.Fprintf(os.Stderr, usage, os.Args[0])
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flag.PrintDefaults()
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}
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flag.BoolVar(&flagHelp, "h", false, "display help message")
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flag.Parse()
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if flagHelp || len(flag.Args()) == 0 {
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flag.Usage()
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os.Exit(0)
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}
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addrStr := flag.Args()[0]
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var addr maddr.Multiaddr
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var merr error
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if strings.HasPrefix(addrStr, "0x") {
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addrBytes, err := hex.DecodeString(addrStr[2:])
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if err != nil {
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fmt.Fprintf(os.Stderr, "parse error: %s\n", err)
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os.Exit(1)
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}
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addr, merr = maddr.NewMultiaddrBytes(addrBytes)
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} else {
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addr, merr = maddr.NewMultiaddr(addrStr)
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}
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if merr != nil {
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fmt.Fprintf(os.Stderr, "parse error: %s\n", merr)
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os.Exit(1)
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}
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infoCommand(addr)
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}
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func infoCommand(addr maddr.Multiaddr) {
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var compsJson []string
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maddr.ForEach(addr, func(comp maddr.Component) bool {
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lengthPrefix := ""
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if comp.Protocol().Size == maddr.LengthPrefixedVarSize {
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lengthPrefix = "0x" + hex.EncodeToString(maddr.CodeToVarint(len(comp.RawValue())))
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}
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compsJson = append(compsJson, `{`+
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fmt.Sprintf(`"string": "%s", `, comp.String())+
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fmt.Sprintf(`"stringSize": "%d", `, len(comp.String()))+
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fmt.Sprintf(`"packed": "0x%x", `, comp.Bytes())+
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fmt.Sprintf(`"packedSize": "%d", `, len(comp.Bytes()))+
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fmt.Sprintf(`"value": %#v, `, comp.Value())+
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fmt.Sprintf(`"rawValue": "0x%x", `, comp.RawValue())+
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fmt.Sprintf(`"valueSize": "%d", `, len(comp.RawValue()))+
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fmt.Sprintf(`"protocol": "%s", `, comp.Protocol().Name)+
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fmt.Sprintf(`"codec": "%d", `, comp.Protocol().Code)+
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fmt.Sprintf(`"uvarint": "0x%x", `, comp.Protocol().VCode)+
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fmt.Sprintf(`"lengthPrefix": "%s"`, lengthPrefix)+
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`}`)
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return true
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})
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addrJson := `{
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"string": "%[1]s",
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"stringSize": "%[2]d",
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"packed": "0x%[3]x",
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"packedSize": "%[4]d",
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"components": [
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%[5]s
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]
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}`
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fmt.Fprintf(os.Stdout, addrJson+"\n",
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addr.String(), len(addr.String()), addr.Bytes(), len(addr.Bytes()), strings.Join(compsJson, ",\n "))
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}
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