go data_error ai_generated partial

io.ReadAtLeast: unexpected EOF

ID: go/io-read-at-least-error

Also available as: JSON · Markdown · 中文
88%Fix Rate
81%Confidence
1Evidence
2023-09-05First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
go1.21 active — — —
go1.22 active — — —
go1.23 active — — —

Root Cause

The io.ReadAtLeast function expected to read at least N bytes from a reader, but the reader returned EOF before providing enough data, indicating a truncated or incomplete stream.

generic

中文

io.ReadAtLeast 函数期望从读取器中读取至少 N 个字节，但读取器在提供足够数据之前返回了 EOF，表明流被截断或不完整。

Official Documentation

https://pkg.go.dev/io#ReadAtLeast

Workarounds

  1. 90% success Check the data source for truncation: if reading a file, verify file size with `os.Stat` before reading; if network stream, ensure the sender transmits the full content. 
    Check the data source for truncation: if reading a file, verify file size with `os.Stat` before reading; if network stream, ensure the sender transmits the full content.
  2. 85% success Use `io.ReadFull` instead of `io.ReadAtLeast` and handle the error gracefully, e.g., by returning a custom error or logging the incomplete read. 
    Use `io.ReadFull` instead of `io.ReadAtLeast` and handle the error gracefully, e.g., by returning a custom error or logging the incomplete read.

中文步骤

  1. Check the data source for truncation: if reading a file, verify file size with `os.Stat` before reading; if network stream, ensure the sender transmits the full content.
  2. Use `io.ReadFull` instead of `io.ReadAtLeast` and handle the error gracefully, e.g., by returning a custom error or logging the incomplete read.

Dead Ends

Common approaches that don't work:

  1. 85% fail

    The issue is not buffer size but the reader ending early; larger buffers won't help if the source is truncated.

  2. 90% fail

    The data is incomplete and may cause corruption or panics later; the error is important to handle.