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Implement cross-engine call dispatch for eWASM
- Implement the eWASM `call` syscall to support calling contracts - Wire up WASM VM as a Disptacher so it can call EVM and Natives (including Precompiles) as well as other WASM contracts. - To support 128-bit wide (and 256-bit wide EVM!) values use big.Int for Value and Gas. Note the Account model currently still uses uint64 so outside of the execution machinery we still throw an error if a balance would overflow uint64. This paves the way for relaxing this requirement and making account balances etc. - exec.CallData `Value` and `Gas` are now the big-endian big.Int bytes rather than uint64 to support the above. - EVM and WASM now share calling and some other code. EVM now more strictly throws errors that are not ExecutionReverted becuase it probably always should have and makes it more consistent with WASM. WASM uses panics to transmit its errors. If we have errors that should not halt execution (AKA 'non-trapping') we should probably explicitly encode this fact into the coded errors and act accordingly and consistenly in WASM and EVM Signed-off-by: Silas Davis <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| package engine | ||
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|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/hyperledger/burrow/acm" | ||
| "github.com/hyperledger/burrow/acm/acmstate" | ||
| "github.com/hyperledger/burrow/crypto" | ||
| "github.com/hyperledger/burrow/execution/errors" | ||
| "github.com/hyperledger/burrow/permission" | ||
| ) | ||
|
|
||
| type Maybe interface { | ||
| PushError(err error) bool | ||
| Error() error | ||
| } | ||
|
|
||
| func GetAccount(st acmstate.Reader, m Maybe, address crypto.Address) *acm.Account { | ||
| acc, err := st.GetAccount(address) | ||
| if err != nil { | ||
| m.PushError(err) | ||
| return nil | ||
| } | ||
| return acc | ||
| } | ||
|
|
||
| // Guaranteed to return a non-nil account, if the account does not exist returns a pointer to the zero-value of Account | ||
| // and pushes an error. | ||
| func MustGetAccount(st acmstate.Reader, m Maybe, address crypto.Address) *acm.Account { | ||
| acc := GetAccount(st, m, address) | ||
| if acc == nil { | ||
| m.PushError(errors.Errorf(errors.Codes.NonExistentAccount, "account %v does not exist", address)) | ||
| return &acm.Account{} | ||
| } | ||
| return acc | ||
| } | ||
|
|
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| func EnsurePermission(callFrame *CallFrame, address crypto.Address, perm permission.PermFlag) error { | ||
| hasPermission, err := HasPermission(callFrame, address, perm) | ||
| if err != nil { | ||
| return err | ||
| } else if !hasPermission { | ||
| return errors.PermissionDenied{ | ||
| Address: address, | ||
| Perm: perm, | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| // CONTRACT: it is the duty of the contract writer to call known permissions | ||
| // we do not convey if a permission is not set | ||
| // (unlike in state/execution, where we guarantee HasPermission is called | ||
| // on known permissions and panics else) | ||
| // If the perm is not defined in the acc nor set by default in GlobalPermissions, | ||
| // this function returns false. | ||
| func HasPermission(st acmstate.Reader, address crypto.Address, perm permission.PermFlag) (bool, error) { | ||
| acc, err := st.GetAccount(address) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| if acc == nil { | ||
| return false, fmt.Errorf("account %v does not exist", address) | ||
| } | ||
| globalPerms, err := acmstate.GlobalAccountPermissions(st) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| perms := acc.Permissions.Base.Compose(globalPerms.Base) | ||
| value, err := perms.Get(perm) | ||
| if err != nil { | ||
| return false, err | ||
| } | ||
| return value, nil | ||
| } | ||
|
|
||
| func CreateAccount(st acmstate.ReaderWriter, address crypto.Address) error { | ||
| acc, err := st.GetAccount(address) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if acc != nil { | ||
| if acc.NativeName != "" { | ||
| return errors.Errorf(errors.Codes.ReservedAddress, | ||
| "cannot create account at %v because that address is reserved for a native contract '%s'", | ||
| address, acc.NativeName) | ||
| } | ||
| return errors.Errorf(errors.Codes.DuplicateAddress, | ||
| "tried to create an account at an address that already exists: %v", address) | ||
| } | ||
| return st.UpdateAccount(&acm.Account{Address: address}) | ||
| } | ||
|
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| func AddressFromName(name string) (address crypto.Address) { | ||
| hash := crypto.Keccak256([]byte(name)) | ||
| copy(address[:], hash[len(hash)-crypto.AddressLength:]) | ||
| return | ||
| } |
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