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feat: rework contract runtime error processing #4181

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merged 19 commits into from
Apr 14, 2021
Merged

feat: rework contract runtime error processing #4181

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b2a6d8b
feat: rework Wasmer1 error processing
olonho Mar 31, 2021
2641d36
Disable trapping Wasmtime tests due to concurrency issues.
olonho Apr 2, 2021
60e6a2a
Review feedback.
olonho Apr 2, 2021
549f582
Fix EVM error message.
olonho Apr 5, 2021
b67513d
Review feedback: less coerse ActionErrorKind::FunctionCallError
olonho Apr 6, 2021
28c2d52
Explicit filed name for WasmUnknownError.
olonho Apr 6, 2021
bdc1bce
Further review feedback.
olonho Apr 7, 2021
5656615
Few final comments.
olonho Apr 7, 2021
1541dcf
Ensure serialization format is compatible.
olonho Apr 9, 2021
882eb2e
Better docs for ContractCallError.
olonho Apr 9, 2021
1273bf2
Into -> From
olonho Apr 9, 2021
0b350e6
Review feedback, add more tests.
olonho Apr 13, 2021
55d6801
Typo.
olonho Apr 13, 2021
9bca1f0
Fix tests.
olonho Apr 13, 2021
5afaca4
Merge branch 'master' into wasmer1_errors
olonho Apr 13, 2021
a7b3a6d
Merge branch 'master' into wasmer1_errors
olonho Apr 13, 2021
378b864
Fix EVM errors.
olonho Apr 14, 2021
27541bf
Merge branch 'master' into wasmer1_errors
olonho Apr 14, 2021
4d4033a
Fix formatting.
olonho Apr 14, 2021
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1 change: 1 addition & 0 deletions Cargo.lock
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48 changes: 44 additions & 4 deletions core/primitives/src/errors.rs
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Expand Up @@ -7,7 +7,7 @@ use std::fmt::{Debug, Display};

use crate::hash::CryptoHash;
use near_rpc_error_macro::RpcError;
use near_vm_errors::{FunctionCallError, VMLogicError};
use near_vm_errors::{CompilationError, FunctionCallErrorSer, MethodResolveError, VMLogicError};

/// Error returned in the ExecutionOutcome in case of failure
#[derive(
Expand Down Expand Up @@ -332,6 +332,46 @@ pub struct ActionError {
pub kind: ActionErrorKind,
}

#[derive(Debug, Clone, PartialEq, Eq, RpcError)]
pub enum ContractCallError {
MethodResolveError(MethodResolveError),
CompilationError(CompilationError),
ExecutionError { msg: String },
}
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This is really good structure, self documented of what could be wrong in contract call :+!


impl From<ContractCallError> for FunctionCallErrorSer {
fn from(e: ContractCallError) -> Self {
match e {
ContractCallError::CompilationError(e) => FunctionCallErrorSer::CompilationError(e),
ContractCallError::MethodResolveError(e) => FunctionCallErrorSer::MethodResolveError(e),
ContractCallError::ExecutionError { msg } => FunctionCallErrorSer::ExecutionError(msg),
}
}
}

impl From<FunctionCallErrorSer> for ContractCallError {
fn from(e: FunctionCallErrorSer) -> Self {
match e {
FunctionCallErrorSer::CompilationError(e) => ContractCallError::CompilationError(e),
FunctionCallErrorSer::MethodResolveError(e) => ContractCallError::MethodResolveError(e),
FunctionCallErrorSer::ExecutionError(msg) => ContractCallError::ExecutionError { msg },
FunctionCallErrorSer::LinkError { msg } => ContractCallError::ExecutionError { msg },
FunctionCallErrorSer::WasmUnknownError => {
ContractCallError::ExecutionError { msg: "unknown error".to_string() }
}
FunctionCallErrorSer::EvmError(e) => {
ContractCallError::ExecutionError { msg: format!("EVM: {:?}", e) }
}
FunctionCallErrorSer::WasmTrap(e) => {
ContractCallError::ExecutionError { msg: format!("WASM: {:?}", e) }
}
FunctionCallErrorSer::HostError(e) => {
ContractCallError::ExecutionError { msg: format!("Host: {:?}", e) }
}
}
}
}

#[derive(
BorshSerialize, BorshDeserialize, Debug, Clone, PartialEq, Eq, Deserialize, Serialize, RpcError,
)]
Expand Down Expand Up @@ -384,8 +424,8 @@ pub enum ActionErrorKind {
#[serde(with = "u128_dec_format")]
minimum_stake: Balance,
},
/// An error occurred during a `FunctionCall` Action.
FunctionCallError(FunctionCallError),
/// An error occurred during a `FunctionCall` Action, parameter is debug message.
FunctionCallError(FunctionCallErrorSer),
/// Error occurs when a new `ActionReceipt` created by the `FunctionCall` action fails
/// receipt validation.
NewReceiptValidationError(ReceiptValidationError),
Expand Down Expand Up @@ -689,7 +729,7 @@ impl Display for ActionErrorKind {
ActionErrorKind::DeleteAccountStaking { account_id } => {
write!(f, "Account {:?} is staking and can not be deleted", account_id)
}
ActionErrorKind::FunctionCallError(s) => write!(f, "{}", s),
ActionErrorKind::FunctionCallError(s) => write!(f, "{:?}", s),
ActionErrorKind::NewReceiptValidationError(e) => {
write!(f, "An new action receipt created during a FunctionCall is not valid: {}", e)
}
Expand Down
59 changes: 40 additions & 19 deletions runtime/near-vm-errors/src/lib.rs
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Original file line number Diff line number Diff line change
@@ -1,11 +1,11 @@
use std::fmt::{self, Error, Formatter};

use borsh::{BorshDeserialize, BorshSerialize};
use serde::{Deserialize, Serialize};

use near_rpc_error_macro::RpcError;
use serde::{Deserialize, Serialize};

#[derive(Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Deserialize, Serialize)]
// TODO: remove serialization derives, once fix compilation caching.
#[derive(Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
pub enum VMError {
FunctionCallError(FunctionCallError),
/// Serialized external error from External trait implementation.
Expand All @@ -17,10 +17,34 @@ pub enum VMError {
CacheError(CacheError),
}

#[derive(
Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Deserialize, Serialize, RpcError,
)]
// TODO(4217): remove serialization derives, once fix compilation caching.
#[derive(Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
pub enum FunctionCallError {
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is this enum still needed given the presence of FunctionCallErrorSer and ContractCallError

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Yes, it's used inside the contract runtime and have precise execution problem description. We don't want it to leak beyond contract runtime.

/// Wasm compilation error
CompilationError(CompilationError),
/// Wasm binary env link error
LinkError {
msg: String,
},
/// Import/export resolve error
MethodResolveError(MethodResolveError),
/// A trap happened during execution of a binary
WasmTrap(WasmTrap),
WasmUnknownError {
debug_message: String,
},
HostError(HostError),
EvmError(EvmError),
/// Non-deterministic error.
Nondeterministic(String),
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Is this error deterministic, i.e, is it guaranteed that a nondeterministic error will be wrapped in this variant?

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Yes, now it is.

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I doubt of still keep it WasmUnkownError is a good for wasmer 1. The internal of it is really unknown in wasmer 0.x (UnknownTrap etc.) but it's indeed known in wasmer 1. I suggest name it as WasmerRuntimeError or WasmerInternalError

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Reworked, so that Nondeterministic is properly returned.

}

/// Serializable version of `FunctionCallError`. Must never reorder/remove elements, can only
/// add new variants at the end (but do that very carefully). This type must be never used
/// directly, and must be converted to `ContractCallError` instead using `into()` converter.
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One missing in doc: since it's never used directly, when it should be used?

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OK, described that it is used in serialization.

/// It describes stable serialization format, and only used by serialization logic.
#[derive(Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Serialize, Deserialize)]
pub enum FunctionCallErrorSer {
/// Wasm compilation error
CompilationError(CompilationError),
/// Wasm binary env link error
Expand All @@ -34,13 +58,9 @@ pub enum FunctionCallError {
WasmUnknownError,
HostError(HostError),
EvmError(EvmError),
/// An error message when wasmer 1.0 returns a wasmer::RuntimeError
WasmerRuntimeError(String),
/// A trap in Wasmer 1.0, not same as WasmTrap above, String is a machine readable form like "stk_ovf"
/// String is used instead of wasmer internal enum is because of BorshSerializable.
/// It can be convert back by wasmer_vm::TrapCode::from_str
Wasmer1Trap(String),
ExecutionError(String),
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I'd do

Suggested change
ExecutionError(String),
ExecutionError { msg: String },

just in case. This thing is serializable to JSON, and, tuple variants are not extensible:

#[derive(serde::Serialize, serde::Deserialize)]
enum E1 {
    V(String),
}

#[derive(serde::Serialize, serde::Deserialize)]
enum E2 {
    V { msg: String },
}

#[derive(serde::Serialize, serde::Deserialize)]
enum E3 {
    V { msg: String, code: u32 },
}


fn main() {
    println!("{}", serde_json::to_string(&E1::V("hello".into())).unwrap());
    println!("{}", serde_json::to_string(&E2::V { msg: "hello".into() }).unwrap());
    println!("{}", serde_json::to_string(&E3::V { msg: "hello".into(), code: 92 }).unwrap());
}

// OUTPUT
{"V":"hello"}
{"V":{"msg":"hello"}}
{"V":{"msg":"hello","code":92}}

Migrating E2 -> E3 is easier that E1 -> E3.

Now, because this is also borsh serializable, this might not be super-relevant, as adding a field to a borsh struct is not compatible, but it's better to be on the safe side here (and consistent with LinkError).

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OK, done.

}

#[derive(
Debug, Clone, PartialEq, Eq, BorshDeserialize, BorshSerialize, Deserialize, Serialize, RpcError,
)]
Expand All @@ -67,8 +87,8 @@ pub enum WasmTrap {
IllegalArithmetic,
/// Misaligned atomic access trap.
MisalignedAtomicAccess,
/// Breakpoint trap.
BreakpointTrap,
/// Indirect call to null.
IndirectCallToNull,
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Add a test case to trigger this error?

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Makes sense, will do.

/// Stack overflow.
StackOverflow,
/// Generic trap.
Expand Down Expand Up @@ -363,12 +383,13 @@ impl fmt::Display for FunctionCallError {
FunctionCallError::HostError(e) => e.fmt(f),
FunctionCallError::LinkError { msg } => write!(f, "{}", msg),
FunctionCallError::WasmTrap(trap) => write!(f, "WebAssembly trap: {}", trap),
FunctionCallError::WasmUnknownError => {
write!(f, "Unknown error during Wasm contract execution")
FunctionCallError::WasmUnknownError { debug_message } => {
write!(f, "Unknown error during Wasm contract execution: {}", debug_message)
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Still feel we should rename this to WasmInternalError, it's a paradox that it's unknown then error detail (debug_message) is given

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Any renames like that would lead to serialization issues again. Think is general we shall go in direction of separatimg runtime and serialized data structures.

}
FunctionCallError::EvmError(e) => write!(f, "EVM: {:?}", e),
FunctionCallError::WasmerRuntimeError(e) => write!(f, "Wasmer Runtime: {}", e),
FunctionCallError::Wasmer1Trap(e) => write!(f, "Wasmer 1.0 trap: {}", e),
FunctionCallError::Nondeterministic(msg) => {
write!(f, "Nondeterministic error during contract execution: {}", msg)
}
}
}
}
Expand All @@ -387,8 +408,8 @@ impl fmt::Display for WasmTrap {
}
WasmTrap::MisalignedAtomicAccess => write!(f, "Misaligned atomic access trap."),
WasmTrap::GenericTrap => write!(f, "Generic trap."),
WasmTrap::BreakpointTrap => write!(f, "Breakpoint trap."),
WasmTrap::StackOverflow => write!(f, "Stack overflow."),
WasmTrap::IndirectCallToNull => write!(f, "Indirect call to null."),
}
}
}
Expand Down
1 change: 1 addition & 0 deletions runtime/near-vm-runner/Cargo.toml
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Expand Up @@ -22,6 +22,7 @@ wasmer-types = { version = "1.0.2", optional = true }
wasmer-compiler-singlepass = { version = "1.0.2", optional = true }
wasmer-compiler-cranelift = { version = "1.0.2", optional = true }
wasmer-engine-native = { version = "1.0.2", optional = true }
wasmer-vm = { version = "1.0.2" }
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pwasm-utils = "0.12"
parity-wasm = "0.41"
wasmtime = { version = "0.25.0", default-features = false, optional = true }
Expand Down
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