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WriteErrorKind.php
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WriteErrorKind.php
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<?php
namespace
TypechoPlugin
\
Access
;
if
(!
defined
(
'
__TYPECHO_ROOT_DIR__
'
)) {
exit
;
}
/**
* 一次写入失败该归咎于「这一行数据」还是「这套环境」
*
* 队列的确认是整批 LTRIM,做不到只确认成功的几条,所以每一条写不进去的消息
* 都必须当场决定去向:转进死信(此后不再重试),还是留在 processing 等下一轮。
* 两种判错的代价严重不对称 ——
* 把环境问题当成脏数据 → 整批倒进死信,死信满 DEAD_MAX_LENGTH 后丢最旧,数据永久消失;
* 把脏数据当成环境问题 → 队列被这条消息堵一阵子,但一条也没丢。
* 所以规则是「只有明确认定是这一行的错才归 Data」,认不出来一律往安全的方向倒。
*/
enum
WriteErrorKind
{
/**
* 明确是这一行的错:字段超长、类型不符、违反约束
*
* 重试多少次都是同样的结果,留在队列里只会永远堵着,转死信。
*/
case
Data;
/**
* 明确不是这一行的错:连不上、没权限、库只读、磁盘满、被管理员中断、表不存在
*
* 换个时间同样的数据就能写进去,必须原样留着。
*/
case
Environment;
/**
* 认不出来
*
* 按 Environment 对待(留着重试),但会计入「卡了多久」:
* 一直认不出又一直写不进去的批次不能永远占着队首,见 Queue::STUCK_SECONDS。
*/
case
Unknown;
/** 是不是「留着重试」这一类 */
public
function
shouldRetry
():
bool
{
return
$
this
!==
self
::Data;
}
/** 万一要进死信,记什么原因 */
public
function
reason
():
string
{
return
match
(
$
this
) {
self
::Data =>
'
db-rejected
'
,
self
::Environment =>
'
db-environment
'
,
self
::Unknown =>
'
db-unknown
'
,
};
}
}
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