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docs(fs): document bounded byte reads

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creatixchu
2026-08-11 12:07:21 +08:00
parent 2a755f2863
commit a3e448ee5d
3 changed files with 6 additions and 6 deletions
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docs/subsystems/filesystem.md
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@@ -52,7 +52,7 @@ type FsTargetKey = Branded<'FsTargetKey'>
type FsVersion = Branded<'FsVersion'>
```
`stat` returns metadata (never content), or `undefined` when the target is absent. `type` lets the tool reject directories/special files before reading, and `size` lets it choose `readText` vs `streamText` without probing by failure. A protocol consumer that needs a byte ceiling applies it while consuming `streamText`, so the filesystem seam needs no consumer-specific bounded-read primitive.
`stat` returns metadata (never content), or `undefined` when the target is absent. `type` lets consumers reject directories and special files before reading, and `size` lets text consumers choose `readText` vs `streamText` without probing by failure. A text consumer applies its own retention ceiling while consuming `streamText`. Raw-byte consumers use `readBytes(target, signal, maxBytes)`; its required complete-content cap makes a known or discovered overflow fail with `FS_TOO_LARGE` instead of truncating or buffering without a bound.
```ts type-equiv
/**
@@ -275,7 +275,7 @@ type FsErrorCode =
## The service and the plugin
`FileSystem` (`ctx.fs`, abstract) owns the provider primitives: `resolve`, `processPath`, `fileUrl`, `contains`, `stat`, `lstat`, `readText`, `streamText`, `listDir`, `writeText`, and `editText`. `dsh-fs-policy` registers **no service** — it is a plugin that adds policy through the `fs/*` event gate: it decides the write/edit intent waterfalls from unseen/absent/present state and records `FsObservation` values. The executor is `dsh-tool-fs`: it reads/writes/edits through `ctx.fs`, dispatches the waterfalls, and emits the recording event. The generated [`ctx.fs` section](#ctxfs--filesystem-abstract-seam) below shows the exact signatures.
`FileSystem` (`ctx.fs`, abstract) owns the provider primitives: `resolve`, `processPath`, `fileUrl`, `contains`, `stat`, `lstat`, `readText`, `streamText`, `readBytes`, `listDir`, `writeText`, and `editText`. `dsh-fs-policy` registers **no service** — it is a plugin that adds policy through the `fs/*` event gate: it decides the write/edit intent waterfalls from unseen/absent/present state and records `FsObservation` values. The executor is `dsh-tool-fs`: it reads/writes/edits through `ctx.fs`, dispatches the waterfalls, and emits the recording event. The generated [`ctx.fs` section](#ctxfs--filesystem-abstract-seam) below shows the exact signatures.
<!-- BEGIN GENERATED cordis-surface (gen-cordis-catalog.ts) — do not edit between markers -->