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main.go
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main.go
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package main
import (
"bytes"
"fmt"
"go/format"
"os"
"path/filepath"
"strings"
)
const header = `// AUTO-GENERATED BY %s. DO NOT MODIFY.
package environment
import (
"github.com/onflow/flow-go/fvm/errors"
"github.com/onflow/flow-go/fvm/storage/state"
"github.com/onflow/flow-go/module/trace"
)
func parseRestricted(
txnState state.NestedTransactionPreparer,
spanName trace.SpanName,
) error {
if txnState.IsParseRestricted() {
return errors.NewParseRestrictedModeInvalidAccessFailure(spanName)
}
return nil
}
// Utility functions used for checking unexpected operation access while
// cadence is parsing programs.
//
// The generic functions are of the form
// parseRestrict<x>Arg<y>Ret(txnState, spanName, callback, arg1, ..., argX)
// where the callback expects <x> number of arguments, and <y> number of
// return values (not counting error). If the callback expects no argument,
// <x>Arg is omitted, and similarly for return value.`
func generateWrapper(numArgs int, numRets int, content *FileContent) {
l := content.Line
push := content.PushIndent
pop := content.PopIndent
argsFuncSuffix := ""
if numArgs > 0 {
argsFuncSuffix = fmt.Sprintf("%dArg", numArgs)
}
argTypes := []string{}
argNames := []string{}
for i := 0; i < numArgs; i++ {
argTypes = append(argTypes, fmt.Sprintf("Arg%dT", i))
argNames = append(argNames, fmt.Sprintf("arg%d", i))
}
retsFuncSuffix := ""
if numRets > 0 {
retsFuncSuffix = fmt.Sprintf("%dRet", numRets)
}
retTypes := []string{}
retNames := []string{}
for i := 0; i < numRets; i++ {
retTypes = append(retTypes, fmt.Sprintf("Ret%dT", i))
retNames = append(retNames, fmt.Sprintf("value%d", i))
}
//
// Generate function signature
//
l("")
l("func parseRestrict%s%s[", argsFuncSuffix, retsFuncSuffix)
push()
for _, typeName := range append(argTypes, retTypes...) {
l("%s any,", typeName)
}
pop()
l("](")
push()
l("txnState state.NestedTransactionPreparer,")
l("spanName trace.SpanName,")
callbackRet := "error"
if numRets > 0 {
callbackRet = "(" + strings.Join(append(retTypes, "error"), ", ") + ")"
}
l("callback func(%s) %s,", strings.Join(argTypes, ", "), callbackRet)
for i, argType := range argTypes {
l("%s %s,", argNames[i], argType)
}
pop()
if numRets == 0 {
l(") error {")
} else {
l(") (")
push()
for _, retType := range retTypes {
l("%s,", retType)
}
l("error,")
pop()
l(") {")
}
push()
//
// Generate parse restrict check
//
l("err := parseRestricted(txnState, spanName)")
l("if err != nil {")
push()
for i, retType := range retTypes {
l("var %s %s", retNames[i], retType)
}
l("return %s", strings.Join(append(retNames, "err"), ", "))
pop()
l("}")
//
// Generate callback invocation
//
l("")
l("return callback(%s)", strings.Join(argNames, ", "))
pop()
l("}")
}
func main() {
if len(os.Args) != 2 {
fmt.Printf("USAGE: %s <output file>\n", filepath.Base(os.Args[0]))
os.Exit(1)
}
cmd := append([]string{filepath.Base(os.Args[0])}, os.Args[1:]...)
content := NewFileContent()
content.Section(header, strings.Join(cmd, " "))
for numArgs := 1; numArgs < 4; numArgs++ {
generateWrapper(numArgs, 0, content)
}
for _, numArgs := range []int{0, 1, 2, 3, 4, 6} {
generateWrapper(numArgs, 1, content)
}
generateWrapper(1, 2, content)
buffer := &bytes.Buffer{}
_, err := content.WriteTo(buffer)
if err != nil {
panic(err) // This should never happen
}
source, formatErr := format.Source(buffer.Bytes())
// NOTE: formatting error can occur if the generated code has syntax
// errors. We still want to write out the unformatted source for debugging
// purpose.
if formatErr != nil {
source = buffer.Bytes()
}
writeErr := os.WriteFile(os.Args[1], source, 0644)
if writeErr != nil {
panic(writeErr)
}
if formatErr != nil {
panic(formatErr)
}
}