Name of a constant given its value

Question

How do you get the name of a constant given its value ?

More specifically (and to get a more readable understanding), I\'m working with the crypto/tls packa

Answer 1

Note: As of Go 1.4, the String() code below can be auto-generated using Go's new generate feature, combined with the stringer command. See here for more info.

Apart from ANisus' answer, you can do the following.

package main

import "fmt"
import "crypto/tls"

type Ciphersuite uint16

const (
    TLS_RSA_WITH_RC4_128_SHA            = Ciphersuite(tls.TLS_RSA_WITH_RC4_128_SHA)
    TLS_RSA_WITH_3DES_EDE_CBC_SHA       = Ciphersuite(tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA)
    TLS_RSA_WITH_AES_128_CBC_SHA        = Ciphersuite(tls.TLS_RSA_WITH_AES_128_CBC_SHA)
    TLS_RSA_WITH_AES_256_CBC_SHA        = Ciphersuite(tls.TLS_RSA_WITH_AES_256_CBC_SHA)
    TLS_ECDHE_RSA_WITH_RC4_128_SHA      = Ciphersuite(tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA)
    TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA = Ciphersuite(tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA)
    TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA  = Ciphersuite(tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA)
    TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA  = Ciphersuite(tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA)
)

func (cs Ciphersuite) String() string {
    switch cs {
    case TLS_RSA_WITH_RC4_128_SHA:
        return "TLS_RSA_WITH_RC4_128_SHA"
    case TLS_RSA_WITH_3DES_EDE_CBC_SHA:
        return "TLS_RSA_WITH_3DES_EDE_CBC_SHA"
    case TLS_RSA_WITH_AES_128_CBC_SHA:
        return "TLS_RSA_WITH_AES_128_CBC_SHA"
    case TLS_RSA_WITH_AES_256_CBC_SHA:
        return "TLS_RSA_WITH_AES_256_CBC_SHA"
    case TLS_ECDHE_RSA_WITH_RC4_128_SHA:
        return "TLS_ECDHE_RSA_WITH_RC4_128_SHA"
    case TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA:
        return "TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA"
    case TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA:
        return "TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA"
    case TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA:
        return "TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA"
    }
    return "Unknown"
}

func main() {
    cs := TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA
    fmt.Printf("0x%04x = %s\n", uint16(cs), cs)

    cs = TLS_RSA_WITH_RC4_128_SHA
    fmt.Printf("0x%04x = %s\n", uint16(cs), cs)

    cs = TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
    fmt.Printf("0x%04x = %s\n", uint16(cs), cs)
}

You can test it on the go playground.