Enum WorkflowError 

pub enum WorkflowError {
    Rollback(String),
    Retry(String),
    Diverged {
        branch_id: String,
        recorded: String,
        got: String,
    },
    Internal(String),
}

函数跑不下去的原因。用 ? 往外抛。

Variants

Rollback(String)

业务明确要求回滚 —— 会触发逆序补偿。 只有这一种会回滚，其它都是重试

Retry(String)

结果未知或还在处理中 —— 退避重试，绝不回滚。 分支返回 Ongoing / Unknown 时自动变成这个

Diverged

重放走岔了：这次跑到第 N 个分支时的名字，跟上次记录的对不上。

说明函数不是确定性的（或者代码改了步骤顺序又碰上老事务）。 这时候不能继续：按位置记忆化会把 A 的结果当成 B 的， 回滚时也会补偿错对象。停下来等人比静默走错安全得多。

Fields

branch_id: String

recorded: String

got: String

Internal(String)

存储层出错之类

Trait Implementations

impl Clone for WorkflowError

fn clone(&self) -> WorkflowError

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WorkflowError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Display for WorkflowError

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Eq for WorkflowError

impl Error for WorkflowError

fn source(&self) -> Option<&(dyn Error + 'static)>

Returns the lower-level source of this error, if any.

fn description(&self) -> &str

👎Deprecated since 1.42.0:

use the Display impl or to_string()

fn cause(&self) -> Option<&dyn Error>

👎Deprecated since 1.33.0:

replaced by Error::source, which can support downcasting

fn provide<'a>(&'a self, request: &mut Request<'a>)

🔬This is a nightly-only experimental API. (error_generic_member_access)

Provides type-based access to context intended for error reports.

impl PartialEq for WorkflowError

fn eq(&self, other: &WorkflowError) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for WorkflowError