mirror of
https://github.com/TronoSfera/backupy-agent.git
synced 2026-05-19 02:23:30 +03:00
8b0c978337
Source ports from the TronoSfera/backupy-cloud monorepo:
- apps/agent/ — Go agent (WSS client, persistent queue, Docker
discovery, 5 DB drivers: PG/MySQL/Mongo/Redis/SQLite,
pre/post hooks, Prometheus metrics)
- apps/backupy-decrypt/ — standalone CLI for client-side decryption
- packages/proto/ — protobuf wire format (generated .pb.go committed
so the repo builds without protoc)
- docs/ — agent spec + wire-protocol contract
Apache-2.0 license. Image published to ghcr.io/tronosfera/backupy-agent
on every v* tag via .github/workflows/release.yml (multi-arch amd64+arm64).
65 lines
2 KiB
Go
65 lines
2 KiB
Go
package pipeline
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import (
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"fmt"
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"io"
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"github.com/klauspost/compress/zstd"
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)
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// CompressZstd streams `in` through a zstd encoder into `out`.
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//
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// Returns:
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// - originalBytes : plaintext bytes consumed from `in`
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// - compressedBytes: zstd-framed bytes written to `out`
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//
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// The encoder is created with the default level (SpeedDefault, ~level 3) —
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// a sensible balance between ratio and CPU for streaming DB dumps. Callers
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// who need a different level should use the lower-level zstdWriter directly.
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func CompressZstd(in io.Reader, out io.Writer) (int64, int64, error) {
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cw := &countingWriter{w: out}
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enc, err := zstd.NewWriter(cw, zstd.WithEncoderLevel(zstd.SpeedDefault))
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if err != nil {
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return 0, 0, fmt.Errorf("pipeline: zstd new writer: %w", err)
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}
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// NOTE: do NOT defer enc.Close() here. klauspost's zstd writer emits
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// an additional empty frame on a second Close() — if we both defer and
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// close explicitly, the trailing 4 bytes corrupt the downstream stream
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// and skew `cw.n`. We close exactly once below and ensure the encoder
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// is released on error paths too.
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n, err := io.Copy(enc, in)
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if err != nil {
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_ = enc.Close()
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return n, cw.n, fmt.Errorf("pipeline: zstd copy: %w", err)
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}
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if err := enc.Close(); err != nil {
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return n, cw.n, fmt.Errorf("pipeline: zstd close: %w", err)
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}
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return n, cw.n, nil
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}
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// NewZstdWriter wraps `out` in a zstd encoder. Callers MUST Close the
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// returned writer before the stream is considered final — the trailer
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// would otherwise be missing.
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func NewZstdWriter(out io.Writer) (io.WriteCloser, error) {
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enc, err := zstd.NewWriter(out, zstd.WithEncoderLevel(zstd.SpeedDefault))
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if err != nil {
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return nil, fmt.Errorf("pipeline: zstd new writer: %w", err)
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}
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return enc, nil
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}
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// countingWriter is an io.Writer that counts bytes written to the
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// wrapped writer. Used to measure compressed output size without
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// double-buffering.
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type countingWriter struct {
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w io.Writer
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n int64
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}
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func (c *countingWriter) Write(p []byte) (int, error) {
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n, err := c.w.Write(p)
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c.n += int64(n)
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return n, err
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}
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