rpc/api/debug_args.go


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package api

import (
    "encoding/json"
    "fmt"
    "math/big"

    "github.com/ethereum/go-ethereum/rpc/shared"
)

type WaitForBlockArgs struct {
    MinHeight int
    Timeout   int // in seconds
}

func (args *WaitForBlockArgs) UnmarshalJSON(b []byte) (err error) {
    var obj []interface{}
    if err := json.Unmarshal(b, &obj); err != nil {
        return shared.NewDecodeParamError(err.Error())
    }

    if len(obj) > 2 {
        return fmt.Errorf("waitForArgs needs 0, 1, 2 arguments")
    }

    // default values when not provided
    args.MinHeight = -1
    args.Timeout = -1

    if len(obj) >= 1 {
        var minHeight *big.Int
        if minHeight, err = numString(obj[0]); err != nil {
            return err
        }
        args.MinHeight = int(minHeight.Int64())
    }

    if len(obj) >= 2 {
        timeout, err := numString(obj[1])
        if err != nil {
            return err
        }
        args.Timeout = int(timeout.Int64())
    }

    return nil
}