') + ')', 'gi'); if (regex.test(text)) { found = true; var frag = document.createDocumentFragment(); var parts = text.split(regex); parts.forEach(function(part, i) { if (i % 2 === 0) { frag.appendChild(document.createTextNode(part)); } else { var span = document.createElement('span'); span.className = 'userscript-highlight'; span.textContent = part; frag.appendChild(span); } }); node.parentNode.replaceChild(frag, node); } }); } else if (node.nodeType === 1 && node.childNodes) { // element var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT']; if (!skipTags.includes(node.tagName)) { Array.from(node.childNodes).forEach(highlight); } } } highlight(document.body); // Re-highlight on dynamic content var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1 || node.nodeType === 3) highlight(node); }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Strip utm_, fbclid, gclid, etc. from all links on page (function() { var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content', 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid', 'ref', 'ref_src', 'source', 'medium', 'campaign']; function cleanUrl(url) { try { var u = new URL(url, window.location.origin); var changed = false; trackingParams.forEach(function(p) { if (u.searchParams.has(p)) { u.searchParams.delete(p); changed = true; } }); return changed ? u.toString() : url; } catch (e) { return url; } } function cleanLinks() { document.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } cleanLinks(); var observer = new MutationObserver(function(mutations) { mutations.forEach(function(m) { m.addedNodes.forEach(function(node) { if (node.nodeType === 1) { if (node.tagName === 'A') cleanLinks(); node.querySelectorAll('a[href]').forEach(function(a) { var clean = cleanUrl(a.href); if (clean !== a.href) a.href = clean; }); } }); }); }); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); } })(); (function(){ try { var __m = "youtube.com"; var __re = new RegExp('^' + "youtube\\.com" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Auto-enable theater mode on YouTube (function() { function tryTheater() { var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]'); if (btn && !btn.classList.contains('activated')) { btn.click(); } } // Try immediately tryTheater(); // Try after navigation (SPA) var lastUrl = location.href; setInterval(function() { if (location.href !== lastUrl) { lastUrl = location.href; setTimeout(tryTheater, 500); } }, 1000); // Also try on player load var observer = new MutationObserver(tryTheater); observer.observe(document.body, { childList: true, subtree: true }); })(); } } catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); } })(); (function(){ try { var __m = "*"; var __re = new RegExp('^' + ".*" + ', 'i'); if (__m === '*' || __re.test(location.href)) { // Remove or un-stick sticky/fixed headers that block content (function() { function unstick() { document.querySelectorAll('header, nav, [role="banner"], .header, .navbar, .sticky, .fixed-top, [style*="position: fixed"], [style*="position:sticky"]').forEach(function(el) { if (el.style.position === 'fixed' || el.style.position === 'sticky' || getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') { el.style.position = 'static'; el.style.top = 'auto'; el.style.zIndex = 'auto'; } }); } unstick(); var observer = new MutationObserver(unstick); observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] }); })(); } } catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); } })(); })(); JsonSerializer.DeserializeAsyncEnumerable should not wait until buffer is filled. by eiriktsarpalis · Pull Request #70430 · dotnet/runtime · GitHub
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JsonSerializer.DeserializeAsyncEnumerable should not wait until buffer is filled.#70430

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Merged
eiriktsarpalis merged 1 commit into from
Jun 10, 2022
Merged

JsonSerializer.DeserializeAsyncEnumerable should not wait until buffer is filled. #70430

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168 changes: 23 additions & 145 deletions ...braries/System.Text.Json/src/System/Text/Json/Serialization/JsonSerializer.Read.Stream.cs
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Original file line numberDiff line numberDiff line change
@@ -1,14 +1,12 @@
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System.Buffers;
using System.Collections.Generic;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.IO;
using System.Runtime.CompilerServices;
using System.Text.Json.Serialization;
using System.Text.Json.Serialization.Converters;
using System.Text.Json.Serialization.Metadata;
using System.Threading;
using System.Threading.Tasks;
Expand DownExpand Up@@ -375,7 +373,7 @@ public static partial class JsonSerializer
}

JsonTypeInfo jsonTypeInfo = options.GetOrAddJsonTypeInfoForRootType(typeof(TValue));
return CreateAsyncEnumerableDeserializer<TValue>(utf8Json, jsonTypeInfo, cancellationToken);
return CreateAsyncEnumerableDeserializer(utf8Json, CreateQueueTypeInfo<TValue>(jsonTypeInfo), cancellationToken);
}

/// <summary>
Expand DownExpand Up@@ -406,36 +404,38 @@ public static partial class JsonSerializer
ThrowHelper.ThrowArgumentNullException(nameof(jsonTypeInfo));
}

return CreateAsyncEnumerableDeserializer<TValue>(utf8Json, jsonTypeInfo, cancellationToken);
return CreateAsyncEnumerableDeserializer(utf8Json, CreateQueueTypeInfo<TValue>(jsonTypeInfo), cancellationToken);
}

private static JsonTypeInfo<Queue<TValue>> CreateQueueTypeInfo<TValue>(JsonTypeInfo jsonTypeInfo)
{
return JsonMetadataServices.CreateQueueInfo<Queue<TValue>, TValue>(
options: jsonTypeInfo.Options,
collectionInfo: new()
{
ObjectCreator = static () => new Queue<TValue>(),
ElementInfo = jsonTypeInfo,
NumberHandling = jsonTypeInfo.Options.NumberHandling
});
}

private static async IAsyncEnumerable<TValue> CreateAsyncEnumerableDeserializer<TValue>(
Stream utf8Json,
JsonTypeInfo jsonTypeInfo,
JsonTypeInfo<Queue<TValue>> queueTypeInfo,
[EnumeratorCancellation] CancellationToken cancellationToken)
{
JsonSerializerOptions options = jsonTypeInfo.Options;
JsonTypeInfo<Queue<TValue>> queueTypeInfo =
JsonMetadataServices.CreateQueueInfo<Queue<TValue>, TValue>(
options: options,
collectionInfo: new()
{
ObjectCreator = () => new Queue<TValue>(),
ElementInfo = jsonTypeInfo,
NumberHandling = options.NumberHandling
});

queueTypeInfo.EnsureConfigured();
JsonSerializerOptions options = queueTypeInfo.Options;
var bufferState = new ReadBufferState(options.DefaultBufferSize);
ReadStack readStack = default;
queueTypeInfo.EnsureConfigured();
readStack.Initialize(queueTypeInfo, supportContinuation: true);
var jsonReaderState = new JsonReaderState(options.GetReaderOptions());

try
{
do
{
bufferState = await ReadFromStreamAsync(utf8Json, bufferState, cancellationToken).ConfigureAwait(false);
bufferState = await bufferState.ReadFromStreamAsync(utf8Json, cancellationToken, fillBuffer: false).ConfigureAwait(false);
Comment thread
eiriktsarpalis marked this conversation as resolved.
ContinueDeserialize<Queue<TValue>>(
ref bufferState,
ref jsonReaderState,
Expand DownExpand Up@@ -476,7 +476,7 @@ private static async IAsyncEnumerable<TValue> CreateAsyncEnumerableDeserializer<
{
while (true)
{
bufferState = await ReadFromStreamAsync(utf8Json, bufferState, cancellationToken).ConfigureAwait(false);
bufferState = await bufferState.ReadFromStreamAsync(utf8Json, cancellationToken).ConfigureAwait(false);
TValue value = ContinueDeserialize<TValue>(ref bufferState, ref jsonReaderState, ref readStack, converter, options);

if (bufferState.IsFinalBlock)
Expand DownExpand Up@@ -507,7 +507,7 @@ private static async IAsyncEnumerable<TValue> CreateAsyncEnumerableDeserializer<
{
while (true)
{
bufferState = ReadFromStream(utf8Json, bufferState);
bufferState.ReadFromStream(utf8Json);
TValue value = ContinueDeserialize<TValue>(ref bufferState, ref jsonReaderState, ref readStack, converter, options);

if (bufferState.IsFinalBlock)
Expand All@@ -522,146 +522,24 @@ private static async IAsyncEnumerable<TValue> CreateAsyncEnumerableDeserializer<
}
}

/// <summary>
/// Read from the stream until either our buffer is filled or we hit EOF.
/// Calling ReadCore is relatively expensive, so we minimize the number of times
/// we need to call it.
/// </summary>
internal static async ValueTask<ReadBufferState> ReadFromStreamAsync(
Stream utf8Json,
ReadBufferState bufferState,
CancellationToken cancellationToken)
{
while (true)
{
int bytesRead = await utf8Json.ReadAsync(
#if BUILDING_INBOX_LIBRARY
bufferState.Buffer.AsMemory(bufferState.BytesInBuffer),
#else
bufferState.Buffer, bufferState.BytesInBuffer, bufferState.Buffer.Length - bufferState.BytesInBuffer,
#endif
cancellationToken).ConfigureAwait(false);

if (bytesRead == 0)
{
bufferState.IsFinalBlock = true;
break;
}

bufferState.BytesInBuffer += bytesRead;

if (bufferState.BytesInBuffer == bufferState.Buffer.Length)
{
break;
}
}

return bufferState;
}

/// <summary>
/// Read from the stream until either our buffer is filled or we hit EOF.
/// Calling ReadCore is relatively expensive, so we minimize the number of times
/// we need to call it.
/// </summary>
internal static ReadBufferState ReadFromStream(
Stream utf8Json,
ReadBufferState bufferState)
{
while (true)
{
int bytesRead = utf8Json.Read(
#if BUILDING_INBOX_LIBRARY
bufferState.Buffer.AsSpan(bufferState.BytesInBuffer));
#else
bufferState.Buffer, bufferState.BytesInBuffer, bufferState.Buffer.Length - bufferState.BytesInBuffer);
#endif

if (bytesRead == 0)
{
bufferState.IsFinalBlock = true;
break;
}

bufferState.BytesInBuffer += bytesRead;

if (bufferState.BytesInBuffer == bufferState.Buffer.Length)
{
break;
}
}

return bufferState;
}

internal static TValue ContinueDeserialize<TValue>(
ref ReadBufferState bufferState,
ref JsonReaderState jsonReaderState,
ref ReadStack readStack,
JsonConverter converter,
JsonSerializerOptions options)
{
if (bufferState.BytesInBuffer > bufferState.ClearMax)
{
bufferState.ClearMax = bufferState.BytesInBuffer;
}

int start = 0;
if (bufferState.IsFirstIteration)
{
bufferState.IsFirstIteration = false;

// Handle the UTF-8 BOM if present
Debug.Assert(bufferState.Buffer.Length >= JsonConstants.Utf8Bom.Length);
if (bufferState.Buffer.AsSpan().StartsWith(JsonConstants.Utf8Bom))
{
start += JsonConstants.Utf8Bom.Length;
bufferState.BytesInBuffer -= JsonConstants.Utf8Bom.Length;
}
}

// Process the data available
TValue value = ReadCore<TValue>(
ref jsonReaderState,
bufferState.IsFinalBlock,
new ReadOnlySpan<byte>(bufferState.Buffer, start, bufferState.BytesInBuffer),
bufferState.Bytes,
options,
ref readStack,
converter);

Debug.Assert(readStack.BytesConsumed <= bufferState.BytesInBuffer);
int bytesConsumed = checked((int)readStack.BytesConsumed);

bufferState.BytesInBuffer -= bytesConsumed;

// The reader should have thrown if we have remaining bytes.
Debug.Assert(!bufferState.IsFinalBlock || bufferState.BytesInBuffer == 0);

if (!bufferState.IsFinalBlock)
{
// Check if we need to shift or expand the buffer because there wasn't enough data to complete deserialization.
if ((uint)bufferState.BytesInBuffer > ((uint)bufferState.Buffer.Length / 2))
{
// We have less than half the buffer available, double the buffer size.
byte[] oldBuffer = bufferState.Buffer;
int oldClearMax = bufferState.ClearMax;
byte[] newBuffer = ArrayPool<byte>.Shared.Rent((bufferState.Buffer.Length < (int.MaxValue / 2)) ? bufferState.Buffer.Length * 2 : int.MaxValue);

// Copy the unprocessed data to the new buffer while shifting the processed bytes.
Buffer.BlockCopy(oldBuffer, bytesConsumed + start, newBuffer, 0, bufferState.BytesInBuffer);
bufferState.Buffer = newBuffer;
bufferState.ClearMax = bufferState.BytesInBuffer;

// Clear and return the old buffer
new Span<byte>(oldBuffer, 0, oldClearMax).Clear();
ArrayPool<byte>.Shared.Return(oldBuffer);
}
else if (bufferState.BytesInBuffer != 0)
{
// Shift the processed bytes to the beginning of buffer to make more room.
Buffer.BlockCopy(bufferState.Buffer, bytesConsumed + start, bufferState.Buffer, 0, bufferState.BytesInBuffer);
}
}
Debug.Assert(readStack.BytesConsumed <= bufferState.Bytes.Length);
bufferState.AdvanceBuffer((int)readStack.BytesConsumed);

return value;
}
Expand Down
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