From ea19d3b9fd8cd35d373fd7f04e3a612f596097d5 Mon Sep 17 00:00:00 2001
From: Nanaloveyuki <miaomiao_159@outlook.com>
Date: Sun, 10 May 2026 13:24:04 +0800
Subject: [PATCH] =?UTF-8?q?=E2=9C=A8=20Add=20file=20policy=20snapshot=20he?=
 =?UTF-8?q?lpers?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                      |  2 ++
 bitlogger/BitLogger_test.mbt   | 13 +++++++++++++
 bitlogger/BitLogger_wbtest.mbt | 11 +++++++++++
 bitlogger/README.mbt.md        |  2 ++
 bitlogger/config.mbt           | 24 ++++++++++++++++++++++++
 bitlogger/sinks.mbt            | 30 ++++++++++++++++++++++++++++++
 docs/README-en.md              |  2 ++
 docs/changes/0.3.0.md          |  1 +
 8 files changed, 85 insertions(+)

diff --git a/README.md b/README.md
index 79939fb..a98e873 100644
--- a/README.md
+++ b/README.md
@@ -246,11 +246,13 @@ match logger.file_runtime_state() {
 - `file_sink(...)` 也可直接读取 `path()` 与 `auto_flush_enabled()` 等基础 file 策略状态
 - `file_sink(...)` 还提供 `rotation_enabled()` 与 `rotation_config()`，可直接查询当前 rotation 策略是否启用及其参数
 - `file_sink(...)` 还提供 `state()`，可一次性读取 path、available、append、auto_flush、rotation 与各类 failure counter 快照
+- `file_sink(...)` 还提供 `policy()` 与 `default_policy()`，可分别读取当前策略与创建时默认策略
 - `file_sink(...)` 还提供 `reset_failure_counters()`，可在完成排障后清空 open/write/flush/rotation 失败计数
 - `file_sink(...)` 还提供 `reset_policy()`，可将 append/auto_flush/rotation 恢复到创建 sink 时的默认策略
 - `file_sink(...)` 也支持 `set_auto_flush(...)`、`set_rotation(...)`、`clear_rotation()`，可在运行期调整基础写出策略
 - `build_logger(...)` 产出的 `ConfiguredLogger` 同样提供 `file_reopen()`、`file_reopen_with_current_policy()`、`file_reopen_append()`、`file_reopen_truncate()`、`file_flush()`、`file_close()`、`file_append_mode()`、`file_path()`、`file_auto_flush()`、`file_rotation_enabled()`、`file_rotation_config()`、`file_state()`，以及 `file_set_append_mode(...)`、`file_set_auto_flush(...)`、`file_set_rotation(...)`、`file_clear_rotation()` 与对应 file failure 计数访问器，便于配置式接入后继续运维控制
 - `ConfiguredLogger` 还提供 `file_runtime_state()`，可在 file sink 外层包了 queue 时同时读取底层 file 快照、是否 queue 包装、当前 pending 与 dropped 计数
+- `ConfiguredLogger` 还提供 `file_policy()` 与 `file_default_policy()`，可分别读取当前 file 策略与初始配置策略
 - `ConfiguredLogger` 也支持 `file_reset_failure_counters()`，可在配置式 file sink 上统一清空失败计数
 - `ConfiguredLogger` 也支持 `file_reset_policy()`，可将配置式 file sink 的运行期策略恢复到初始配置
 - `file_sink_state_to_json(...)`、`stringify_file_sink_state(...)`、`runtime_file_state_to_json(...)`、`stringify_runtime_file_state(...)` 可直接把 file / queued-file 快照导出为 JSON，便于排障或上报
diff --git a/bitlogger/BitLogger_test.mbt b/bitlogger/BitLogger_test.mbt
index 939bfb9..ae4bb48 100644
--- a/bitlogger/BitLogger_test.mbt
+++ b/bitlogger/BitLogger_test.mbt
@@ -330,9 +330,13 @@ test "configured logger file setters update file sink policy state" {
       queue=Some(QueueConfig::new(2, overflow=QueueOverflowPolicy::DropNewest)),
     ),
   )
+  let default_policy = logger.file_default_policy()
   inspect(logger.file_append_mode(), content="true")
   inspect(logger.file_auto_flush(), content="true")
   inspect(logger.file_rotation_enabled(), content="false")
+  inspect(default_policy.append, content="true")
+  inspect(default_policy.auto_flush, content="true")
+  inspect(default_policy.rotation is None, content="true")
   inspect(logger.file_set_append_mode(false), content="true")
   inspect(logger.file_append_mode(), content="false")
   inspect(logger.file_set_auto_flush(false), content="true")
@@ -352,9 +356,13 @@ test "configured logger file setters update file sink policy state" {
   inspect(logger.file_reopen(), content=if logger.file_available() { "true" } else { "false" })
   inspect(logger.file_append_mode(), content="false")
   let state = logger.file_state()
+  let policy = logger.file_policy()
   inspect(state.append, content="false")
   inspect(state.auto_flush, content="false")
   inspect(state.rotation is None, content="true")
+  inspect(policy.append, content="false")
+  inspect(policy.auto_flush, content="false")
+  inspect(policy.rotation is None, content="true")
   inspect(logger.file_reset_policy(), content="true")
   inspect(logger.file_append_mode(), content="true")
   inspect(logger.file_auto_flush(), content="true")
@@ -374,6 +382,9 @@ test "configured logger reset policy restores configured file defaults" {
       ),
     ),
   )
+  let default_policy = logger.file_default_policy()
+  inspect(default_policy.append, content="false")
+  inspect(default_policy.auto_flush, content="false")
   inspect(logger.file_set_append_mode(true), content="true")
   inspect(logger.file_set_auto_flush(true), content="true")
   inspect(logger.file_clear_rotation(), content="true")
@@ -393,6 +404,8 @@ test "configured logger reset policy restores configured file defaults" {
 test "configured non-file logger cannot reset file policy" {
   let logger = build_logger(LoggerConfig::new(sink=SinkConfig::new(kind=SinkKind::Console)))
   inspect(logger.file_reset_policy(), content="false")
+  inspect(logger.file_policy().append, content="false")
+  inspect(logger.file_default_policy().append, content="false")
 }
 
 test "configured logger can reopen built file sink" {
diff --git a/bitlogger/BitLogger_wbtest.mbt b/bitlogger/BitLogger_wbtest.mbt
index f2aa7dc..32fd5db 100644
--- a/bitlogger/BitLogger_wbtest.mbt
+++ b/bitlogger/BitLogger_wbtest.mbt
@@ -130,9 +130,13 @@ test "file sink rotation config normalizes invalid inputs" {
 
 test "file sink setters update auto flush and rotation state" {
   let sink = file_sink("bitlogger-setters.log")
+  let default_policy = sink.default_policy()
   inspect(sink.append_mode(), content="true")
   inspect(sink.auto_flush_enabled(), content="true")
   inspect(sink.rotation_enabled(), content="false")
+  inspect(default_policy.append, content="true")
+  inspect(default_policy.auto_flush, content="true")
+  inspect(default_policy.rotation is None, content="true")
   sink.set_append_mode(false)
   inspect(sink.append_mode(), content="false")
   sink.set_auto_flush(false)
@@ -152,9 +156,13 @@ test "file sink setters update auto flush and rotation state" {
   inspect(sink.reopen(), content=if sink.is_available() { "true" } else { "false" })
   inspect(sink.append_mode(), content="false")
   let state = sink.state()
+  let policy = sink.policy()
   inspect(state.append, content="false")
   inspect(state.auto_flush, content="false")
   inspect(state.rotation is None, content="true")
+  inspect(policy.append, content="false")
+  inspect(policy.auto_flush, content="false")
+  inspect(policy.rotation is None, content="true")
   sink.reset_policy()
   inspect(sink.append_mode(), content="true")
   inspect(sink.auto_flush_enabled(), content="true")
@@ -171,6 +179,9 @@ test "file sink reset policy restores configured defaults" {
   sink.set_append_mode(true)
   sink.set_auto_flush(true)
   sink.clear_rotation()
+  let default_policy = sink.default_policy()
+  inspect(default_policy.append, content="false")
+  inspect(default_policy.auto_flush, content="false")
   sink.reset_policy()
   inspect(sink.append_mode(), content="false")
   inspect(sink.auto_flush_enabled(), content="false")
diff --git a/bitlogger/README.mbt.md b/bitlogger/README.mbt.md
index e3c676d..79e1f3e 100644
--- a/bitlogger/README.mbt.md
+++ b/bitlogger/README.mbt.md
@@ -242,6 +242,7 @@ test {
 - `path()` and `auto_flush_enabled()` expose core file sink policy state / `path()` 与 `auto_flush_enabled()` 可读取 file sink 的基础策略状态
 - `rotation_enabled()` and `rotation_config()` expose whether rotation is active and which settings are currently applied / `rotation_enabled()` 与 `rotation_config()` 可读取 rotation 是否启用及当前配置参数
 - `state()` exposes a single file-sink snapshot including path, availability, append policy, auto-flush, rotation config, and failure counters / `state()` 可一次性读取包含 path、availability、append、auto-flush、rotation 配置与失败计数的 file sink 快照
+- `policy()` and `default_policy()` expose the current runtime policy and the sink's original defaults separately / `policy()` 与 `default_policy()` 可分别读取当前运行期策略与 sink 初始默认策略
 - `reset_failure_counters()` clears the open/write/flush/rotation counters after diagnostics or recovery / `reset_failure_counters()` 可在排障或恢复后清空 open/write/flush/rotation 失败计数
 - `reset_policy()` restores append, auto-flush, and rotation back to the sink's original defaults / `reset_policy()` 可将 append、auto-flush、rotation 恢复到 sink 初始默认策略
 - `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` and `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` export snapshots as JSON / `file_sink_state_to_json(...)` / `stringify_file_sink_state(...)` 与 `runtime_file_state_to_json(...)` / `stringify_runtime_file_state(...)` 可将快照直接导出为 JSON
@@ -249,6 +250,7 @@ test {
 - `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` expose basic sink health counters / `open_failures()`、`write_failures()`、`flush_failures()`、`rotation_failures()` 可用于观察基础 sink 健康状态
 - `ConfiguredLogger` also forwards file reopen, flush, close, append-mode, path, auto-flush, rotation-config, state snapshot, append setter, policy setter, and failure-counter helpers for config-built file sinks / `ConfiguredLogger` 也会为配置生成的 file sink 转发 reopen、flush、close、append-mode、path、auto-flush、rotation 配置、state 快照、append setter、策略 setter 与失败计数访问器
 - `ConfiguredLogger::file_runtime_state()` also reports whether a file sink is queue-wrapped and exposes the outer queue pending/drop counters together with the inner file snapshot / `ConfiguredLogger::file_runtime_state()` 还可报告 file sink 是否被 queue 包装，并将外层 queue 的 pending/drop 计数与内层 file 快照一起返回
+- `ConfiguredLogger::file_policy()` and `ConfiguredLogger::file_default_policy()` also expose current runtime policy and initial config policy separately / `ConfiguredLogger::file_policy()` 与 `ConfiguredLogger::file_default_policy()` 也可分别读取当前运行期策略与初始配置策略
 - `ConfiguredLogger::file_reset_failure_counters()` also clears file failure counters through the config-built control surface / `ConfiguredLogger::file_reset_failure_counters()` 也可通过配置式控制面清空 file 失败计数
 - `ConfiguredLogger::file_reset_policy()` also restores runtime file policy back to the initial config values / `ConfiguredLogger::file_reset_policy()` 也可将运行期 file 策略恢复到初始配置值
 - current scope is observability-first, not a full self-healing sink runtime / 当前定位仍以可观测性优先，不是完整自愈型 sink runtime
diff --git a/bitlogger/config.mbt b/bitlogger/config.mbt
index ae80c14..137e9c4 100644
--- a/bitlogger/config.mbt
+++ b/bitlogger/config.mbt
@@ -498,6 +498,22 @@ pub fn RuntimeSink::file_reset_policy(self : RuntimeSink) -> Bool {
   }
 }
 
+pub fn RuntimeSink::file_policy(self : RuntimeSink) -> FileSinkPolicy {
+  match self {
+    File(sink) => sink.policy()
+    QueuedFile(sink) => sink.sink.policy()
+    _ => FileSinkPolicy::new(append=false, auto_flush=false, rotation=None)
+  }
+}
+
+pub fn RuntimeSink::file_default_policy(self : RuntimeSink) -> FileSinkPolicy {
+  match self {
+    File(sink) => sink.default_policy()
+    QueuedFile(sink) => sink.sink.default_policy()
+    _ => FileSinkPolicy::new(append=false, auto_flush=false, rotation=None)
+  }
+}
+
 pub fn RuntimeSink::file_state(self : RuntimeSink) -> FileSinkState {
   match self {
     File(sink) => sink.state()
@@ -644,6 +660,14 @@ pub fn ConfiguredLogger::file_reset_policy(self : ConfiguredLogger) -> Bool {
   self.sink.file_reset_policy()
 }
 
+pub fn ConfiguredLogger::file_policy(self : ConfiguredLogger) -> FileSinkPolicy {
+  self.sink.file_policy()
+}
+
+pub fn ConfiguredLogger::file_default_policy(self : ConfiguredLogger) -> FileSinkPolicy {
+  self.sink.file_default_policy()
+}
+
 pub fn ConfiguredLogger::file_state(self : ConfiguredLogger) -> FileSinkState {
   self.sink.file_state()
 }
diff --git a/bitlogger/sinks.mbt b/bitlogger/sinks.mbt
index e2cd95e..007b182 100644
--- a/bitlogger/sinks.mbt
+++ b/bitlogger/sinks.mbt
@@ -77,6 +77,20 @@ pub struct FileSinkState {
   rotation_failures : Int
 }
 
+pub struct FileSinkPolicy {
+  append : Bool
+  auto_flush : Bool
+  rotation : FileRotation?
+}
+
+pub fn FileSinkPolicy::new(
+  append~ : Bool = true,
+  auto_flush~ : Bool = true,
+  rotation~ : FileRotation? = None,
+) -> FileSinkPolicy {
+  { append, auto_flush, rotation }
+}
+
 pub fn FileSinkState::new(
   path : String,
   available~ : Bool = false,
@@ -232,6 +246,22 @@ pub fn FileSink::reset_policy(self : FileSink) -> Unit {
   self.rotation.val = self.default_rotation
 }
 
+pub fn FileSink::policy(self : FileSink) -> FileSinkPolicy {
+  FileSinkPolicy::new(
+    append=self.append.val,
+    auto_flush=self.auto_flush.val,
+    rotation=self.rotation.val,
+  )
+}
+
+pub fn FileSink::default_policy(self : FileSink) -> FileSinkPolicy {
+  FileSinkPolicy::new(
+    append=self.default_append,
+    auto_flush=self.default_auto_flush,
+    rotation=self.default_rotation,
+  )
+}
+
 pub fn FileSink::state(self : FileSink) -> FileSinkState {
   {
     path: self.path,
diff --git a/docs/README-en.md b/docs/README-en.md
index 0bd29bb..6574982 100644
--- a/docs/README-en.md
+++ b/docs/README-en.md
@@ -230,11 +230,13 @@ match logger.file_runtime_state() {
 - `file_sink(...)` also exposes `path()` and `auto_flush_enabled()` for reading basic file-sink policy state.
 - `file_sink(...)` also exposes `rotation_enabled()` and `rotation_config()` for reading whether rotation is active and which parameters are currently in effect.
 - `file_sink(...)` also exposes `state()` for reading a single snapshot that includes path, availability, append policy, auto-flush flag, rotation config, and all current failure counters.
+- `file_sink(...)` also exposes `policy()` and `default_policy()` for reading the current runtime policy and the sink's original default policy separately.
 - `file_sink(...)` also exposes `reset_failure_counters()` so open/write/flush/rotation failure counters can be cleared after diagnostics or recovery handling.
 - `file_sink(...)` also exposes `reset_policy()` so append, auto-flush, and rotation settings can be restored to the sink's original defaults.
 - `file_sink(...)` also supports `set_auto_flush(...)`, `set_rotation(...)`, and `clear_rotation()` for runtime policy updates.
 - `ConfiguredLogger` built through `build_logger(...)` also exposes `file_reopen()`, `file_reopen_with_current_policy()`, `file_reopen_append()`, `file_reopen_truncate()`, `file_flush()`, `file_close()`, `file_append_mode()`, `file_path()`, `file_auto_flush()`, `file_rotation_enabled()`, `file_rotation_config()`, `file_state()`, plus `file_set_append_mode(...)`, `file_set_auto_flush(...)`, `file_set_rotation(...)`, `file_clear_rotation()`, and the corresponding file failure counters, so config-driven file logging keeps a usable control surface.
 - `ConfiguredLogger` also exposes `file_runtime_state()` so queued file loggers can report both the underlying file snapshot and the outer queue backlog/drop state in one read.
+- `ConfiguredLogger` also exposes `file_policy()` and `file_default_policy()` for reading current runtime file policy and initial config policy separately.
 - `ConfiguredLogger` also exposes `file_reset_failure_counters()` for clearing file failure counters through the config-built control surface.
 - `ConfiguredLogger` also exposes `file_reset_policy()` for restoring runtime file policy back to the initial config values.
 - `file_sink_state_to_json(...)`, `stringify_file_sink_state(...)`, `runtime_file_state_to_json(...)`, and `stringify_runtime_file_state(...)` can export file and queued-file snapshots directly as JSON for diagnostics or reporting.
diff --git a/docs/changes/0.3.0.md b/docs/changes/0.3.0.md
index 20f6022..aa906ca 100644
--- a/docs/changes/0.3.0.md
+++ b/docs/changes/0.3.0.md
@@ -44,6 +44,7 @@ version 0.3.0
 - feat: add JSON export helpers for `FileSinkState` and `RuntimeFileState` so runtime file snapshots can be dumped directly for diagnostics
 - feat: add `reset_failure_counters()` / `file_reset_failure_counters()` so file failure counters can be cleared after diagnostics or recovery handling
 - feat: add `reset_policy()` / `file_reset_policy()` so runtime append, auto-flush, and rotation settings can be restored to their initial defaults
+- feat: add `policy()` / `default_policy()` and configured-logger forwarding helpers so current runtime file policy and original defaults can be read explicitly
 - feat: add `SplitSink`, `split_sink(...)`, and `split_by_level(...)` for routing records into different sinks by predicate or level
 - feat: add `Logger::bind(...)` as an ergonomic context-binding alias and `fields(...)` helper for tuple-based field construction