Negative or huge Retry-After makes the retry sleep throw IllegalArgumentException

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2/5
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1-3 小時
新手友好度
72/100
Issue 類型
缺陷
描述清晰度
描述清楚
活躍度
活躍
技術堆疊
java
領域
backend

研究方向

從 httpclient/src/main/java/com/backblaze/b2/client/webApiHttpClient/B2WebApiHttpClientImpl.java 中的 getRetryAfterSecondsOrNull 開始,然後查看 core/src/main/java/com/backblaze/b2/client/ 中的 B2DefaultRetryPolicy.java 和 B2Sleeper.sleepSeconds。撰寫一個單元測試來重現問題:讓 B2Retryer.doRetry 收到一個可重試的例外,並讓 getRetryAfterSecondsOrNull 回傳 -1 或 2200000。當超出範圍的 Retry-After 值被限制或被拒絕,且睡眠不再拋出 IllegalArgumentException 時,即完成。

由索引模型根據 Issue 內容生成。

描述

What happens

The Retry-After header is parsed with Integer.parseInt and returned unchanged as the wait time. B2Sleeper.sleepSeconds then computes seconds * 1000 as an int, which is negative for a negative header and overflows for values above about 2.1 million seconds, and Thread.sleep throws an unchecked IllegalArgumentException. The exception escapes the retry loop, although the code comment in B2Retryer says the sleep "won't throw".

Where

httpclient/src/main/java/com/backblaze/b2/client/webApiHttpClient/B2WebApiHttpClientImpl.java:303-314 (getRetryAfterSecondsOrNull), core/src/main/java/com/backblaze/b2/client/B2DefaultRetryPolicy.java:44-52 (returns the server value unchecked), core/src/main/java/com/backblaze/b2/client/B2Sleeper.java:37-38 (seconds * 1000), called from B2Retryer.java (sleeper.sleepSeconds(waitSeconds)).

Why it matters

Impact: Availability (a retryable error turns into an unexpected runtime exception), loud. Severity: High, because it needs a Retry-After value that is negative or over about 2.1 million seconds from the server (unusual, since the HTTP spec allows only non-negative delays), and there is no workaround besides a custom retry policy.

How to check

Found by reading the code, not reproduced. Read the four places above. A unit test could make B2Retryer.doRetry see a retryable exception whose getRetryAfterSecondsOrNull() returns -1 or 2200000 and observe the exception from Thread.sleep. Clamping the value to a sane range in the retry policy or in B2Sleeper would avoid it.

Version

Seen at v6.5.0. Present on the default branch: present.

主要語言
Java
星號
103
分支
23
平均合併
5 天 8 小時
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