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7568d8a2a2
List()-based size check depends on the storage backend returning accurate file sizes, which is not guaranteed (some WebDAV/Google Drive impls may return 0 or omit the size field). New approach: wrap the upload io.Reader with a CountingReader that counts bytes as they flow through during upload. After upload completes, compare counter.n against the expected fileSize. This is: - Zero extra network calls (no List, no Download) - Zero extra CPU/memory overhead (just an int64 increment per Read) - Storage-backend agnostic (works with any provider) If bytes transmitted != expected size → mark failed + auto-delete remote.