forked from newalchemylimited/seth
/
read.go
102 lines (90 loc) · 1.92 KB
/
read.go
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package main
import (
"flag"
"fmt"
"math/big"
"strconv"
"strings"
"github.com/philhofer/seth"
)
var cmdread = &cmd{
desc: "read data from a contract",
usage: "eth read <addr> <fn> <args>... <rettype>",
do: read,
}
func init() {
cmdread.fs.Init("read", flag.ExitOnError)
// re-use a flag from call()
cmdread.fs.BoolVar(&forcecall, "f", false, "ignore jump table inconsistency")
}
func empty(typ string) interface{} {
switch typ {
case "string":
return new(string)
case "bool":
return new(bool)
case "bytes":
return new(seth.Bytes)
case "int8", "uint8", "int16", "uint16", "int32",
"uint32", "int64", "uint64",
"int128", "uint128", "int256", "uint256",
"int", "uint":
return big.NewInt(0)
case "address":
return new(seth.Address)
}
if strings.HasPrefix(typ, "bytes") {
for i := 1; i <= 32; i++ {
if typ == "bytes"+strconv.Itoa(i) {
return new(seth.Data)
}
}
}
fatalf("unsupported return type %q", typ)
return nil
}
func decoder(args []string) *seth.ABIDecoder {
var d seth.ABIDecoder
for _, a := range args {
d = append(d, empty(a))
}
return &d
}
func read(fs *flag.FlagSet) {
args := fs.Args()
if len(args) < 2 {
fs.Usage()
}
addr, err := seth.ParseAddress(args[0])
if err != nil {
fatalf("can't parse address: %q: %s\n", args[0], err)
}
c := client()
callargs := parsefn(c, addr, args[1], args[2:])
rettypes := args[2+len(callargs):]
d := decoder(rettypes)
var zeroaddr seth.Address
s := seth.NewSender(c, &zeroaddr)
err = s.ConstCall(addr, args[1], d, callargs...)
if err != nil {
fatalf("error making call: %s\n", err)
}
for _, v := range *d {
switch v := v.(type) {
case *string:
fmt.Println(*v)
case *bool:
fmt.Println(*v)
case *big.Int:
fmt.Println(v.String())
case *seth.Address:
fmt.Println(v.String())
case *seth.Data:
fmt.Printf("%x\n", *v)
case *seth.Bytes:
fmt.Printf("%x\n", *v)
default:
fmt.Printf("%#v\n", v)
}
}
}