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tiennm99
fde3ae7efd
README.md and site/data.json were written with os.Create/os.WriteFile, so a write that failed midway left the repo front page truncated, while history.jsonl already used a temp-file-plus-rename. Extract that pattern into atomicWriteFile and route all three writers through it. Also sort snapshots by date when reading history.jsonl: delta windows pick the newest snapshot inside the window by scan order, which silently produces wrong deltas if a hand edit or a merge of two concurrent runs interleaves lines. Cover the README renderer, which had no test beyond sanitizeCell, and name the generated paths as constants instead of repeating literals. Coverage 65.1% -> 75.7%.
39 lines
1.0 KiB
Go
39 lines
1.0 KiB
Go
package main
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import (
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"io"
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"os"
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)
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// atomicWriteFile writes through a temp file in the same directory and renames
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// it over path, so a crash or a failed write never leaves a generated file
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// truncated or half-written. The callback receives the temp file as an
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// io.Writer, which suits streaming producers (templates, JSON encoders)
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// without buffering the whole payload in memory.
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//
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// Errors from Sync and Close are reported too: on a write path they are the
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// difference between "data reached the disk" and silent loss.
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func atomicWriteFile(path string, write func(io.Writer) error) error {
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tmp := path + ".tmp"
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f, err := os.Create(tmp)
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if err != nil {
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return err
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}
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writeErr := write(f)
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if syncErr := f.Sync(); syncErr != nil && writeErr == nil {
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writeErr = syncErr
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}
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if closeErr := f.Close(); closeErr != nil && writeErr == nil {
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writeErr = closeErr
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}
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if writeErr != nil {
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_ = os.Remove(tmp) // best-effort cleanup; the write error is what matters
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return writeErr
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}
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return os.Rename(tmp, path)
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}
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