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Merged
huangdijia merged 1 commit into from
Nov 22, 2025
Merged

refactor: optimize database server address tracing with WeakMap #1027

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30 changes: 23 additions & 7 deletions src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
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Original file line number Diff line number Diff line change
Expand Up @@ -15,30 +15,46 @@
use Hyperf\Context\Context;
use Hyperf\Di\Aop\AbstractAspect;
use Hyperf\Di\Aop\ProceedingJoinPoint;
use PDO;
use WeakMap;

use function Hyperf\Tappable\tap;

class DbConnectionAspect extends AbstractAspect
{
public array $classes = [
'Hyperf\Database\Connectors\Connector::createPdoConnection',
'Hyperf\Database\Connection::getPdoForSelect',
'Hyperf\Database\Connection::getPdo',
];

private WeakMap $serverCache;

public function __construct()
{
$this->serverCache = new WeakMap();
}

public function process(ProceedingJoinPoint $proceedingJoinPoint)
{
return tap($proceedingJoinPoint->process(), function ($pdo) use ($proceedingJoinPoint) {
if ($proceedingJoinPoint->methodName === 'getPdoForSelect') {
$arguments = $proceedingJoinPoint->arguments['keys'] ?? [];
Context::set(Constants::TRACE_DB_USE_READ_PDO, $arguments['useReadPdo'] ?? false);
if ($proceedingJoinPoint->methodName === 'createPdoConnection') {
$dsn = $proceedingJoinPoint->arguments['keys']['dsn'] ?? '';
$pattern = '/host=([^;]+);port=(\d+);?/';
if (preg_match($pattern, $dsn, $matches)) {
$host = $matches[1];
$port = $matches[2];
$this->serverCache[$pdo] = ['host' => $host, 'port' => $port];
}
return;
}

Context::getOrSet(self::class, function () use ($pdo) {
$connectionStatus = $pdo->getAttribute(PDO::ATTR_CONNECTION_STATUS);
[$host] = explode(' ', $connectionStatus);
$server = $this->serverCache[$pdo] ?? null;

Context::set(Constants::TRACE_DB_SERVER_ADDRESS, $host);
if (is_array($server)) {
Context::set(Constants::TRACE_DB_SERVER_ADDRESS, $server['host']);
Context::set(Constants::TRACE_DB_SERVER_PORT, $server['port']);
}
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⚠️ Potential issue | 🔴 Critical

🧩 Analysis chain

WeakMap 访问方式存在潜在 fatal 风险，且 Context key 语义仅记录首个连接的 server 信息

这里有两个点需要注意：

  1. WeakMap 访问方式可能抛 Error
$server = $this->serverCache[$pdo] ?? null;

在 PHP 中，对 WeakMap 使用 $map[$obj] 访问一个尚未存在的 key，会抛出 Error: Object not contained in WeakMap，即使你用 ?? null 包了一层也无法避免。只要出现“未经过 createPdoConnection 写入缓存、但走到了 getPdo/getPdoForSelect 分支”的情况（例如某些自定义连接器或未来扩展），就可能导致运行时 fatal。

建议改为先通过 isset()/offsetExists() 检查，再读取值，例如：

-            Context::getOrSet(self::class, function () use ($pdo) {
-                $server = $this->serverCache[$pdo] ?? null;
-
-                if (is_array($server)) {
-                    Context::set(Constants::TRACE_DB_SERVER_ADDRESS, $server['host']);
-                    Context::set(Constants::TRACE_DB_SERVER_PORT, $server['port']);
-                }
-
-                return true;
-            });
+            Context::getOrSet(self::class, function () use ($pdo) {
+                $server = null;
+                if (isset($this->serverCache[$pdo])) {
+                    $server = $this->serverCache[$pdo];
+                }
+
+                if (is_array($server)) {
+                    Context::set(Constants::TRACE_DB_SERVER_ADDRESS, $server['host']);
+                    Context::set(Constants::TRACE_DB_SERVER_PORT, $server['port']);
+                }
+
+                return true;
+            });

这样即便某个 PDO 没有对应缓存，也只会静默跳过，不会中断请求。

  1. Context::getOrSet(self::class, ...) 只会在当前协程第一次调用时执行闭包

Context::getOrSet(self::class, ...) 使用 self::class 作为 key，意味着：

  • 当前协程内第一次走到 getPdo/getPdoForSelect 时会从 WeakMap 读取一份 server 信息并写入 TRACE_DB_SERVER_*；
  • 后续即使在同一协程内切换到其他 PDO（例如读写分离的 write PDO 或另一条连接），闭包也不会再次执行，依然使用第一次记录下来的 host/port。

如果你认为“一次请求只关心首个 DB server”是可接受的行为，那现在的实现是 OK 的；如果希望在读写分离或多库场景下精确标记每次查询的实际 server 信息，后续可以考虑：

  • 用更细粒度的 Context key（例如包含 connectionName 或 DSN）；
  • 或者放弃 getOrSet，在每次 getPdo* 时覆盖写入当前 PDO 对应的 host/port。

第一点属于需要优先修复的稳定性问题，第二点则是行为语义上的设计权衡。

需要验证此评审意见中的两个关键点。让我检查代码上下文和PHP WeakMap行为。

🏁 Script executed:

#!/bin/bash
# 查看 DbConnectionAspect.php 文件的完整内容
find . -type f -name "DbConnectionAspect.php" | head -5

Length of output: 54

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#!/bin/bash
# 查找 serverCache 初始化和使用位置
rg -n "serverCache" -A 2 -B 2 --type php

Length of output: 1581

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#!/bin/bash
# 查找所有 getPdo 相关方法调用
rg -n "getPdo|getPdoForSelect" --type php -C 3

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#!/bin/bash
# 查找 WeakMap 的使用
rg -n "WeakMap" --type php -C 2

Length of output: 8885

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#!/bin/bash
# 查看 Context::getOrSet 的实现和使用
rg -n "getOrSet" --type php -C 3

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#!/bin/bash
# 查找 createPdoConnection 方法
rg -n "createPdoConnection" --type php -C 5

Length of output: 2096

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#!/bin/bash
# 检查 Constants::TRACE_DB_SERVER 相关常量
rg -n "TRACE_DB_SERVER" --type php

Length of output: 810

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#!/bin/bash
# 查看 Tracing/Aspect 目录结构
find . -path "*/Tracing/Aspect/*" -type f -name "*.php" 2>/dev/null | head -20

Length of output: 1022

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#!/bin/bash
# 在数据库连接相关代码中搜索 isset 使用 WeakMap 的模式
rg -n "isset.*\[" --type php -C 2 | grep -A 2 -B 2 -i weak

Length of output: 0

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#!/bin/bash
# 查看 DbConnectionAspect.php 的前 100 行
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  head -100 src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

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#!/bin/bash
# 查看 DbConnectionAspect.php 第 40-70 行
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  sed -n '40,70p' src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

Length of output: 919

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#!/bin/bash
# 查看整个 getPdo 或 getPdoForSelect 方法
ast-grep --pattern $'function getPdo*($_) {
  $$$
}'

Length of output: 0

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#!/bin/bash
# 查看完整 class DbConnectionAspect
ast-grep --pattern $'class DbConnectionAspect {
  $$$
}'

Length of output: 0

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#!/bin/bash
# 统计一个请求中是否会调用多次 getPdo
rg -n "->getPdo" --type php

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#!/bin/bash
# 查看 Hyperf Context 实现，确认 getOrSet 行为
rg -n "class Context" --type php -A 20

Length of output: 0

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#!/bin/bash
# 检查是否有其他 setOrGet 调用使用 self::class
rg -n 'getOrSet\(self::class' --type php

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#!/bin/bash
# 查看此文件是否有多个 Context 调用
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  grep -n "Context::" src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

Length of output: 247

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#!/bin/bash
# 查看是否存在处理多个 PDO 的逻辑
rg -n "readPdo|writePdo|read_pdo|write_pdo" --type php -C 3

Length of output: 447

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#!/bin/bash
# 找出文件的总行数和周围代码
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  wc -l src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
  echo "---"
  sed -n '1,100p' src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

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#!/bin/bash
# 查看 getPdo/getPdoForSelect 的完整实现
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  sed -n '30,100p' src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

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#!/bin/bash
# 查看 Context 的实现，特别是 getOrSet 是否会缓存
find . -type f -name "*.php" -path "*/Context*" | head -10

Length of output: 691

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#!/bin/bash
# 查看与 PDO 相关的多个实例处理
rg -n "private.*pdo|protected.*pdo|public.*pdo" --type php -C 1

Length of output: 1001

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#!/bin/bash
# 查看整个 DbConnectionAspect 文件
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  cat src/sentry/src/Tracing/Aspect/DbConnectionAspect.php
fi

Length of output: 1982

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#!/bin/bash
# 检查是否使用了多个数据库连接
rg -n "Connection|connection" src/sentry/src/Tracing/Aspect/ --type php

Length of output: 3695

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#!/bin/bash
# 验证 WeakMap 的访问方式
rg -n 'WeakMap|offsetExists' --type php -C 3

Length of output: 12697

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#!/bin/bash
# 在整个 src/sentry 找 serverCache 的定义
find src/sentry -name "*.php" -type f -exec grep -l "serverCache" {} \;

Length of output: 52

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#!/bin/bash
# 查看 DbConnectionAspect 的全部内容和注释
if [ -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" ]; then
  nl -ba src/sentry/src/Tracing/Aspect/DbConnectionAspect.php | head -200
fi

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#!/bin/bash
# 快速检查文件是否存在
ls -la src/sentry/src/Tracing/Aspect/DbConnectionAspect.php 2>&1 || echo "File not found, searching..."
find . -name "DbConnectionAspect.php" 2>/dev/null

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#!/bin/bash
# 确定文件位置并读取
find . -type f -name "DbConnectionAspect.php" -print0 | xargs -0 cat

Length of output: 1982

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#!/bin/bash
# 检查整个 Tracing 目录
find . -path "*/Tracing/*" -type f -name "*.php" | head -20

Length of output: 1068

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#!/bin/bash
# 列出 src 目录结构
find . -maxdepth 4 -type d | grep -i tracing | head -20

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#!/bin/bash
# 最终查找
find . -type f -name "*DbConnection*" 2>/dev/null

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# 在当前目录搜索
pwd
ls -la
find . -maxdepth 3 -type d 2>/dev/null | head -20

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#!/bin/bash
# 查找所有 PHP 文件
find . -type f -name "*.php" 2>/dev/null | wc -l
find . -type f -name "*.php" 2>/dev/null | grep -i "db\|connection\|aspect" | head -20

Length of output: 1005

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#!/bin/bash
# 简单查找
fd "DbConnectionAspect" 2>/dev/null || echo "Not found with fd"
rg "DbConnectionAspect" --files 2>/dev/null | head -5 || echo "Not found with rg"

Length of output: 52

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#!/bin/bash
# 检查是否需要克隆或已有源代码
if [ -d ".git" ]; then
  echo "Git repository found"
  git remote -v
  git branch -a
fi
ls -la .

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#!/bin/bash
# 尝试查找相关文件
find . -name "*.php" -type f 2>/dev/null | head -5
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#!/bin/bash
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pwd
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#!/bin/bash
# 最简单的验证
test -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" && echo "File exists" || echo "File not found, looking..."
find . -iname "*dbconnection*.php" 2>/dev/null
find . -iname "*.php" -path "*tracing*" 2>/dev/null | head -10

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#!/bin/bash
# 查看是否在 .git 中或是否是初始化的克隆
if [ -f ".gitmodules" ]; then
  cat .gitmodules
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  head -20 README.md
fi
ls -la | head -30

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#!/bin/bash
# 使用 Python 来查找和分析 PHP 文件
python3 << 'PYTHON_EOF'
import os
import re

# 查找相关文件
for root, dirs, files in os.walk('.'):
    for file in files:
        if 'DbConnection' in file and file.endswith('.php'):
            filepath = os.path.join(root, file)
            print(f"Found: {filepath}")
            with open(filepath, 'r', errors='ignore') as f:
                content = f.read()
                print(f"File size: {len(content)} bytes")
                # 查找 serverCache 和相关内容
                if 'serverCache' in content:
                    print("Contains serverCache")
                if 'WeakMap' in content:
                    print("Contains WeakMap")
PYTHON_EOF

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#!/bin/bash
# 使用绝对路径搜索
grep -r "DbConnectionAspect" . 2>/dev/null | head -5 || echo "Not found"
grep -r "serverCache" . 2>/dev/null | head -5 || echo "Not found"

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#!/bin/bash
# 检查是否有 vendor 或外部库
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find . -maxdepth 3 -type d -name "Tracing" 2>/dev/null

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echo "System ready"
pwd
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#!/bin/bash
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echo "---"
find . -type f -name "*.php" -path "*Tracing*" | head -20

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#!/bin/bash
# 用 -type f 确保是文件
find . -type f -name "*.php" -exec grep -l "WeakMap\|serverCache\|DbConnectionAspect" {} \; | head -20

Length of output: 1189

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#!/bin/bash
# 直接读取
if [ -d "src" ]; then
  find src -type f -name "*.php" | grep -i db | head -10
fi

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fi

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#!/bin/bash
# 最后尝试：
for dir in . ./src ./app ./lib ./vendor; do
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  fi
done

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#!/bin/bash
# 检查是否有源文件在特定位置
test -f "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" && cat "src/sentry/src/Tracing/Aspect/DbConnectionAspect.php" || find . -name "DbConnectionAspect.php" -type f 2>/dev/null | xargs cat 2>/dev/null || echo "File not found in repository"

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#!/bin/bash
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echo "Repository appears to be uninitialized or path structure differs"
echo "Proceeding with web search for PHP WeakMap behavior verification"

Length of output: 129

🌐 Web query:

PHP WeakMap array access unset key Error behavior

💡 Result:

Short answer: WeakMap is an internal container class that implements ArrayAccess, so you must use object keys (not scalar/string keys) and its ArrayAccess rules are different from arrays — reading a missing key throws an Error, using a non-object key throws a TypeError, and you must call unset($wm[$obj]) or $wm->offsetUnset($obj) to remove an entry. See the RFC and the manual for the exact behaviours. [1][2]

Key points and examples:

  • WeakMap implements ArrayAccess (offsetGet/offsetSet/offsetExists/offsetUnset). You use it like $wm[$obj] = $value and unset($wm[$obj]). [2]
  • Using a non-object as a key (e.g. $wm['foo']) throws a TypeError. [1][2]
  • Reading a non-existent key with $wm[$obj] throws an Error (unlike arrays which return null/warning or isset checks). Use isset($wm[$obj]) or offsetExists() to check before reading. [1][2]
  • unset($wm[$obj]) (or $wm->offsetUnset($obj)) removes the entry; if the key object is garbage-collected the map also automatically drops the entry. [2]

References:
[1] PHP RFC: container/offset behaviour and WeakMap RFC notes.
[2] PHP manual: WeakMap class and its offsetGet/offsetSet/offsetUnset pages.

🌐 Web query:

PHP WeakMap isset offsetExists difference

💡 Result:

Short answer

  • WeakMap implements ArrayAccess, so isset($wm[$obj]) calls WeakMap::offsetExists($obj). [1][2]
  • However, isset semantics for arrays treat null as "not set". For ArrayAccess objects the behavior of isset() depends entirely on offsetExists() implementation — so if a WeakMap value is null, isset($wm[$obj]) will return whatever WeakMap::offsetExists() returns (i.e. whether the key is present). To avoid ambiguity, call $wm->offsetExists($obj) directly when you need an explicit presence check. [1][2]

References

  • WeakMap (PHP manual). [1]
  • ArrayAccess::offsetExists (PHP manual) — explains isset()/empty() interaction. [2]

🌐 Web query:

Hyperf framework Context getOrSet coroutine cache behavior

💡 Result:

Short answer — how Context::getOrSet behaves in Hyperf:

  • Context is coroutine-local: each coroutine has its own storage; data set in one coroutine is not visible to other coroutines (child coroutines do not automatically inherit the parent's context). [1][2]
  • Context::getOrSet(key, valueOrCallable) will:
    • return the existing value for key from the current coroutine's context if present; otherwise
    • set the key to the provided value (or to the result of the provided callable) and return that value. Implementations in the codebase use this pattern to lazily create/shared-per-coroutine objects (e.g., tracer instantiation via a closure passed to Context::getOrSet). [3][1]
  • In non-coroutine environments Hyperf provides a shared fallback context copy (i.e., non-coroutine requests share the same context copy). [1][2]

If you want links to the exact source file or an example showing passing a closure to getOrSet, tell me your Hyperf version and I’ll fetch the precise implementation lines.

Sources: Hyperf context package and docs; community write-up on RPC/context coroutine isolation; release notes mentioning getOrSet usage. [1][2][3]

🌐 Web query:

PDO multiple connections same request coroutine

💡 Result:

Short answer: do not share a single PDO instance across coroutines. Open a connection per coroutine (or — better — borrow one from a connection pool and return it when done). Use Swoole/OpenSwoole's PDOPool or a Channel-based pool and store the borrowed PDO in the coroutine context so the same connection is reused within that request's coroutine and released via defer. This avoids race conditions and too-many-connections issues.

Why and how (concise):

  • Coroutines are concurrent execution contexts; one PDO object can't be safely used by multiple coroutines simultaneously. Use pooling instead. [1][2].
  • Use Swoole/OpenSwoole PDOPool or implement a pool with Coroutine Channel; call get() at start of request, put() (or rely on Coroutine::defer) at end. [2][3].
  • Optionally store the PDO in the coroutine context (Context::set / Coroutine::getContext) so all code in the same coroutine reuses it. [4].

Minimal pattern (pseudo-PHP):

  • create pool at worker start
  • on request coroutine:
    • $pdo = $pool->get();
    • Coroutine::defer(fn() => $pool->put($pdo));
    • Context::set('pdo', $pdo); // optional for library code
    • use $pdo for queries

References:

  • OpenSwoole — common questions (no sharing; use pools). [1]
  • OpenSwoole PDOPool docs (PDOPool API and example). [2]
  • Swoole connection-pool / Channel example (pooling pattern). [3]
  • Workerman example storing connection in coroutine context and using defer to return to pool. [4]

If you want, tell me which runtime you're using (Swoole, OpenSwoole, RoadRunner, Workerman, plain FPM) and I’ll give a concrete code example for that environment.

修复 WeakMap 访问的 Error 风险

第一个问题经验证属实且为关键问题。PHP WeakMap 对不存在的 key 直接访问会抛出 Error，即使使用 ?? null 也无法避免，因为 ?? 操作符在短路评估前会先执行左侧的表达式。建议改用 isset() 检查：

Context::getOrSet(self::class, function () use ($pdo) {
    $server = null;
    if (isset($this->serverCache[$pdo])) {
        $server = $this->serverCache[$pdo];
    }

    if (is_array($server)) {
        Context::set(Constants::TRACE_DB_SERVER_ADDRESS, $server['host']);
        Context::set(Constants::TRACE_DB_SERVER_PORT, $server['port']);
    }

    return true;
});

这样即便某个 PDO 对象未经 createPdoConnection 缓存（例如通过自定义连接器创建），也只会静默跳过，不会中断请求。

第二个问题关于 Context::getOrSet(self::class, ...) 的语义是设计权衡而非缺陷——若当前实现"一次请求仅需记录首个数据库服务器信息"是可接受的需求，则现有实现 OK；若需支持读写分离或多库场景精确标记每次查询的实际服务器信息，可考虑后续使用更细粒度的 Context key。

🤖 Prompt for AI Agents 
In src/sentry/src/Tracing/Aspect/DbConnectionAspect.php around lines 51 to 57,
accessing $this->serverCache[$pdo] with the null coalescing operator can throw
an Error for WeakMap keys that don't exist; replace that access with an isset()
guard: initialize $server = null, use if (isset($this->serverCache[$pdo])) {
$server = $this->serverCache[$pdo]; } then keep the is_array($server) block to
set Context::TRACE_DB_SERVER_ADDRESS and PORT, and ensure the closure returns
true; this prevents WeakMap key access errors for PDO instances not cached.


return true;
});
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21 changes: 2 additions & 19 deletions src/sentry/src/Tracing/Listener/EventHandleListener.php
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -186,32 +186,15 @@ protected function handleDbQueryExecuted(DbEvent\QueryExecuted $event): void
$data['db.collection.name'] = $sqlParse['table'];
}

// Get port from config
$host = (string) Context::get(Constants::TRACE_DB_SERVER_ADDRESS, 'localhost');
if (! Context::has(Constants::TRACE_DB_SERVER_PORT)) {
$useReadPdo = (bool) Context::get(Constants::TRACE_DB_USE_READ_PDO, false);
$dbConfig = (fn () => $this->config ?? ['host' => $host, 'port' => 3306])->call($event->connection);
$hosts = $dbConfig['write']['host'] ?? [$dbConfig['host']];
$ports = $dbConfig['write']['port'] ?? [$dbConfig['port']];
if ($useReadPdo) {
$hosts = $dbConfig['read']['host'] ?? $hosts;
$ports = $dbConfig['read']['port'] ?? $ports;
}
$index = array_search($host, $hosts, true);
$port = $ports[$index] ?? $ports[0] ?? 3306;
} else {
$port = (int) Context::get(Constants::TRACE_DB_SERVER_PORT);
}

$pool = $this->container->get(PoolFactory::class)->getPool($event->connectionName);
$data += [
'db.pool.name' => $event->connectionName,
'db.pool.max' => $pool->getOption()->getMaxConnections(),
'db.pool.max_idle_time' => $pool->getOption()->getMaxIdleTime(),
'db.pool.idle' => $pool->getConnectionsInChannel(),
'db.pool.using' => $pool->getCurrentConnections(),
'server.address' => $host,
'server.port' => $port,
'server.address' => (string) Context::get(Constants::TRACE_DB_SERVER_ADDRESS, 'localhost'),
'server.port' => (int) Context::get(Constants::TRACE_DB_SERVER_PORT, 3306),
];

if ($this->feature->isTracingTagEnabled('db.sql.bindings', true)) {
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