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Use new quota algorithm
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See WICG/pending-beacon#87 (comment)
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@noamr
noamr committed Apr 11, 2024
1 parent cd37dda commit 876e0b6
Showing 1 changed file with 128 additions and 47 deletions.
175 changes: 128 additions & 47 deletions fetch.bs
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Expand Up @@ -2723,6 +2723,13 @@ a <a for=/>list</a> of <a for="/" data-lt="fetch record">fetch records</a>.
<dfn export for="fetch group" id=concept-defer=fetch-record>deferred fetch records</dfn>,
a <a for=/>list</a> of <a data-lt="deferred fetch record">deferred fetch records</a>.

<p>A <a for=fetch>fetch group</a> has an associated boolean
<dfn for="fetch group">is eligible for deferred fetching</dfn>.

To initialize a <a for=fetch>fetch group</a> for a given <a>environment settings object</a>
<var>settings</var>, set its <a for="fetch group">is eligible for deferred fetching</a> to the
result of calling <a>check deferred fetching eligibility</a> given <var>settings</var>.

<p>A <dfn export>fetch record</dfn> is a [=struct=]. It has the following items:

<dl>
Expand Down Expand Up @@ -6712,9 +6719,9 @@ i.e., when a <a>fetch group</a> is <a for="fetch group">terminated</a>, or after
<li><p>If <var>request</var>'s <a for=request>URL</a> is not a
<a>potentially trustworthy url</a>, then throw a "{{SecurityError}}" {{DOMException}}.

<li><p>If the result of calling [$Is feature enabled in document for origin?$] given
"<code>deferred-fetch</code>", <var>document</var>, and <var>request</var>'s
<a for=request>origin</a> is <code>Disabled</code>, then throw a {{NotAllowedError}}.
<li><p>If <var>request</var>'s <a for=request>client</a>'s <a for=fetch>fetch group</a>
<a for="fetch group">is eligible for deferred fetching</a> is false, then throw a
"{{NotAllowedError}}" {{DOMException}}.

<li>
<p>If <var>request</var>'s <a for=request>body</a> is non-null then:
Expand All @@ -6729,50 +6736,11 @@ i.e., when a <a>fetch group</a> is <a for="fetch group">terminated</a>, or after

<p class=note>This disallows sending deferred fetches with a live {{ReadableStream}}.

<li><p>Let <var>totalScheduledDeferredBytesForTopLevelDocument</var> be
<var>request</var>'s <a for=request>body</a>'s <a for=body>length</a>.

<li><p>Let <var>totalScheduledDeferredBytesForOrigin</var> be <var>request</var>'s
<a for=request>body</a>'s <a for=body>length</a>.

<li>
<p><a for=list>For each</a> <var>navigable</var> of <var>document</var>'s
<a>node navigable</a>'s <a for=navigable>top-level traversable</a>'s
<a for=Document>inclusive descendant navigables</a>:

<p class=note>This algorithm asserts that this deferred fetch doesn't exceed two quotas: one for
the top-level document (640 kibibytes), and one for the reporting origin (64 kibibytes). The
larger quota ensures that the top-level {{Document}} and its subresources don't continue using
an unlimited amount of bandwidth after being destroyed. The smaller quota ensures that a single
reporting sink doesn't reserve the whole quota to itself.

<ol>
<li>
<p><a for=list>For each</a> <a>deferred fetch record</a> <var>deferredRecord</var> in
<var>navigable</var>'s <a>active document</a>'s <a for=fetch>fetch group</a>'s
<a for="fetch group">deferred fetch records</a>:</p>

<ol>
<li><p>Let <var>length</var> be <var>deferredRecord</var>'s
<a for="deferred fetch record">request</a>'s <a for=request>body</a>'s
<a for=body>length</a>.

<li><p>Increment <var>totalScheduledDeferredBytesForTopLevelDocument</var> by <var>length</var>.

<li><p>If <var>totalScheduledDeferredBytesForTopLevelDocument</var> is greater than 640
kibibytes, then throw a "{{QuotaExceededError}}" {{DOMException}}.

<li><p>If <var>deferredRecord</var>'s <a for="deferred fetch record">request</a>'s
<a for=request>URL</a>'s <a for=url>origin</a> is <a>same origin</a> with
<var>request</var>'s <a for=request>origin</a>, then increment
<var>totalScheduledDeferredBytesForOrigin</var> by <var>length</var>.

<li><p>If <var>totalScheduledDeferredBytesForOrigin</var> is greater than 64 kibibytes, then
throw a "{{QuotaExceededError}}" {{DOMException}}.
</ol>
</li>
</ol>
</li>
<li><p>If the
<a>available deferred fetching quota</a> given <var>document</var> and <var>request</var>'s
<a for=request>URL</a>'s <a for=url>origin</a> is less than <var>request</var>'s
<a for=request>body</a>'s <a for=body>length</a>, then throw a "{{QuotaExceededError}}"
{{DOMException}}.
</ol>

<li><p>Set <var>request</var>'s <a for=request>service-workers mode</a> to "<code>none</code>".
Expand Down Expand Up @@ -6808,6 +6776,119 @@ i.e., when a <a>fetch group</a> is <a for="fetch group">terminated</a>, or after
</ol>
</div>

<div algorithm>
<p>To get the <dfn>available deferred fetching quota</dfn> given a <code>Document</code>
<var>document</var> and an <a for=/>origin</a>-or-null <var>origin</var>:

<p class=note>This algorithm asserts that this deferred fetch doesn't exceed two quotas: one for the
top-level document (640 kibibytes), and one for the reporting origin (64 kibibytes). The larger
quota ensures that the top-level {{Document}} and its subresources don't continue using an unlimited
amount of bandwidth after being destroyed. The smaller quota ensures that a single reporting sink
doesn't reserve the whole quota to itself.

<ol>
<li><p>Let <var>closestSameOriginInclusiveAncestor</var> be <var>document</var>'s
<a>node navigable</a>.

<li><p>While <var>closestSameOriginInclusiveAncestor</var>'s <a for=navigable>parent</a> is a
<a for=/>navigable</a> whose <a>active document</a>'s <a for=Document>origin</a> is <a>same origin</a>
with <var>document</var>'s <a for=Document>origin</a>, set
<var>closestSameOriginInclusiveAncestor</var> to <var>closestSameOriginInclusiveAncestor</var>'s
<a for=navigable>parent</a>.

<li><p>Let <var>directRelativeSameOriginNavigables</var> be the
<a>inclusive direct same origin descendants</a> of <var>closestSameOriginInclusiveAncestor</var>.

<li><p>Let <var>remainingTotalQuota</var> be 640 kibibytes if
<var>directRelativeSameOriginNavigables</var> includes <var>document</var>'s
<a>node navigable</a>'s <a for=navigable>top-level traversable</a>, and 64 kibibytes otherwise.

<li><p>Let <var>remainingQuotaForOrigin</var> be 64 kibibytes.

<li>
<p><a for=list>For each</a> <var>navigable</var> in
<var>directRelativeSameOriginNavigables</var>:

<ol>
<li>
<p><a for=list>For each</a> <a>deferred fetch record</a> <var>deferredRecord</var> in
<var>navigable</var>'s <a>active document</a>'s <a for=fetch>fetch group</a>'s
<a for="fetch group">deferred fetch records</a>:</p>

<ol>
<li><p>Let <var>length</var> be <var>deferredRecord</var>'s
<a for="deferred fetch record">request</a>'s <a for=request>body</a>'s
<a for=body>length</a>.

<li><p>Decrement <var>remainingTotalQuota</var> by <var>length</var>.

<li><p>If <var>origin</var> is not null, and <var>deferredRecord</var>'s
<a for="deferred fetch record">request</a>'s <a for=request>URL</a>'s <a for=url>origin</a> is
<a>same origin</a> with <var>origin</var>, then decrement <var>remainingQuotaForOrigin</var> by
<var>length</var>.
</ol>
</li>

<li><p>Let <var>navigableContainers</var> be a list of all <a>shadow-including descendants</a> of
<var>navigable</var>'s <a>active document</a> that are <a>navigable containers</a>.

<li>
<p><a for=list>For each</a> <var>childNavigable</var> of <var>navigableContainers</var>:

<ol>
<li><p>If <var>childNavigable</var>'s <a>active document</a>'s <a for=Document>origin</a> is
not <a>same origin</a> with <a for=/>navigable</a>'s <a>active document</a>'s
<a for=Document>origin</a> and <var>childNavigable</var>'s <a>active document</a>'s
<a for=fetch>fetch group</a>'s <a for="fetch group">is eligible for deferred fetching</a> is true,
then decrement <var>remainingTotalQuota</var> by 64 kibibytes.
</ol>
</li>
</ol>
</li>

<li><p>If <var>remainingTotalQuota</var> is less than <var>remainingQuotaForOrigin</var>, then
return <var>remainingTotalQuota</var>.

<li><p>Return <var>remainingQuotaForOrigin</var>.
</ol>
</div>

<div algorithm>
<p>To get the <dfn>inclusive direct same origin descendants</dfn> of a <a for=/>navigable</a>
<var>root</var>:</p>

<ol>
<li><p>Let <var>descendants</var> be « <var>root</var> ».

<li><p>Let <var>navigableContainers</var> be a list of all <a>shadow-including descendants</a>
of <var>root</var>'s <a>active document</a> that are <a>navigable containers</a>.

<li><p><a for=list>For each</a> <var>childNavigable</var> of <var>navigableContainers</var>
whose <a>active document</a>'s <a for=Document>origin</a> is <a>same origin</a> with
<a for=/>navigable</a>'s <a>active document</a>'s <a for=Document>origin</a>, <a for=list>extend</a>
<var>descendants</var> with <var>childNavigable</var>'s
<a>inclusive direct same origin descendants</a>.

<li><p>Return <var>descendants</var>.
</ol>
</div>

<div algorithm>
To <dfn>check deferred fetching eligibility</dfn> given an <a>environment settings object</a>
<var>settings</var>:

<ol>
<li><p>If <var>settings</var> is not a <code>Document</code>, return false.

<li><p>If the result of calling [$Is feature enabled in document for origin?$] given
<var>settings</var> is <code>Disabled</code>, return false.

<li><p>If the <a>available deferred fetching quota</a> given <var>settings</var> and null is less
than 64 kibibytes, return false.

<li><p>Return true.
</div>

<div algorithm>
<p>To <dfn export>process deferred fetches</dfn> given a <a>fetch group</a> <var>fetchGroup</var>:

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