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natspec for poc-9

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- put natspec.js in a heredoc string (to help binary)
- constructor takes no args, just sets up js vm
- API: only exports Notice(transaction, abi, method, expression string) (string, error)
- effort to turn natspec.js error strings to proper go errors
- test errors
This commit is contained in:
zelig
2015-03-08 20:09:13 +07:00
parent 07955b3041
commit 97dc4edb45
3 changed files with 148 additions and 102 deletions
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58
ethutil/natspec/natspec.go
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@@ -1,24 +1,21 @@
package natspec
import (
"fmt"
"github.com/obscuren/otto"
"io/ioutil"
)
type NatSpec struct {
jsvm *otto.Otto
}
func NewNATSpec(transaction string) (self *NatSpec, err error) {
// TODO: should initialise with abi and userdoc jsons
func NewNATSpec() (self *NatSpec, err error) {
self = new(NatSpec)
self.jsvm = otto.New()
code, err := ioutil.ReadFile("natspec.js")
if err != nil {
return
}
_, err = self.jsvm.Run(string(code))
_, err = self.jsvm.Run(natspecJS)
if err != nil {
return
}
@@ -27,39 +24,40 @@ func NewNATSpec(transaction string) (self *NatSpec, err error) {
return
}
self.jsvm.Run("var transaction = " + transaction + ";")
return
}
func (self *NatSpec) SetDescription(desc string) (err error) {
func (self *NatSpec) Notice(transaction, abi, method, expression string) (string, error) {
var err error
if _, err = self.jsvm.Run("var transaction = " + transaction + ";"); err != nil {
return "", fmt.Errorf("natspec.js error setting transaction: %v", err)
}
_, err = self.jsvm.Run("var expression = \"" + desc + "\";")
return
if _, err = self.jsvm.Run("var abi = " + abi + ";"); err != nil {
return "", fmt.Errorf("natspec.js error setting abi: %v", err)
}
}
if _, err = self.jsvm.Run("var method = '" + method + "';"); err != nil {
return "", fmt.Errorf("natspec.js error setting method: %v", err)
}
func (self *NatSpec) SetABI(abi string) (err error) {
_, err = self.jsvm.Run("var abi = " + abi + ";")
return
}
func (self *NatSpec) SetMethod(method string) (err error) {
_, err = self.jsvm.Run("var method = '" + method + "';")
return
}
func (self *NatSpec) Parse() string {
if _, err = self.jsvm.Run("var expression = \"" + expression + "\";"); err != nil {
return "", fmt.Errorf("natspec.js error setting expression: %v", err)
}
self.jsvm.Run("var call = {method: method,abi: abi,transaction: transaction};")
value, err := self.jsvm.Run("natspec.evaluateExpression(expression, call);")
if err != nil {
return err.Error()
return "", fmt.Errorf("natspec.js error evaluating expression: %v", err)
}
return value.String()
evalError := "Natspec evaluation failed, wrong input params"
if value.String() == evalError {
return "", fmt.Errorf("natspec.js error evaluating expression: wrong input params in expression '%s'", expression)
}
if len(value.String()) == 0 {
return "", fmt.Errorf("natspec.js error evaluating expression")
}
return value.String(), nil
}