jschoubben
5fa64be894
Main reverted G's half merge (#189, reverted by8afc3ebin #191) and then took the reader release's S1-S5, which copied G's code. G's form holds where they differ (process_bus.go, seats.go, state.go and their tests); the release's kept names stay so main's callers keep building: SeatViewPrefix beside SeatReadPrefix, and QueueInvoke's empty strings on not-ok (with its test TestQueueInvoke). The tree differs from G's headf30dee54only by those and the release's two tests (objects cap option, seat states and stream kinds). Builds: design 47 G (the milestone's sdk part, as atf30dee54) Claude-Session: https://claude.ai/code/session_01NcbgfGKaxw984XyAPfLm4h
87 lines
2.9 KiB
Go
87 lines
2.9 KiB
Go
// Package busarchive is the bus's snapshot archive: its manifest, reading one back and holding it to
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// its checksums. The snapshot program (cmd/mesh-nats-snapshot) writes and restores with it and the bus's
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// tool nats_snapshot_verify (cmd/nats-tools) checks with it, so the two never differ on what a good
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// snapshot is.
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package busarchive
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import (
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"archive/tar"
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"io"
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"strings"
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"time"
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"github.com/klauspost/compress/s2"
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)
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// Manifest is the first entry of an archive: what was taken, when, how long it took, and the checksum
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// of every file beside it. It is what `verify` and `restore` hold the archive to.
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type Manifest struct {
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Format int `json:"format"`
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Server string `json:"server_version"`
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Started time.Time `json:"started"`
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Finished time.Time `json:"finished"`
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Seconds float64 `json:"seconds"`
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// Messages and StreamBytes are the streams' own totals at their snapshots; ArchiveBytes what the
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// archives take, compressed.
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Messages uint64 `json:"messages"`
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StreamBytes int64 `json:"stream_bytes"`
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ArchiveBytes int64 `json:"archive_bytes"`
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Streams []StreamEntry `json:"streams"`
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// Skipped are streams that hold nothing across a restart (memory storage), said rather than
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// silently left out.
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Skipped []Skipped `json:"skipped,omitempty"`
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}
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// StreamEntry is one stream as it was snapshotted.
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type StreamEntry struct {
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Name string `json:"name"`
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Subjects []string `json:"subjects,omitempty"`
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Retention string `json:"retention,omitempty"`
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Messages uint64 `json:"messages"`
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Bytes uint64 `json:"bytes"`
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FirstSeq uint64 `json:"first_seq"`
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LastSeq uint64 `json:"last_seq"`
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Deleted int `json:"deleted,omitempty"`
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Consumers int `json:"consumers"`
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// Meta is the server's own description of the stream (its configuration and state), in the
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// shape the restore API and the nats CLI take back: backup.json.
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Meta string `json:"meta"`
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MetaSHA256 string `json:"meta_sha256"`
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// Archive is the server's snapshot of the stream, as the server sent it: stream.tar.s2.
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Archive string `json:"archive"`
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ArchiveBytes int64 `json:"archive_bytes"`
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ArchiveSHA256 string `json:"archive_sha256"`
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Seconds float64 `json:"seconds"`
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}
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// Skipped is a stream not snapshotted, and why.
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type Skipped struct {
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Name string `json:"name"`
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Why string `json:"why"`
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}
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// ManifestName is the archive's first entry.
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const ManifestName = "manifest.json"
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// ReadsThrough is whether a stream's archive decompresses and lists to its end.
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func ReadsThrough(r io.Reader) error {
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tr := tar.NewReader(s2.NewReader(r))
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for {
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_, err := tr.Next()
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if err == io.EOF {
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return nil
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}
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if err != nil {
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return err
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}
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if _, err := io.Copy(io.Discard, tr); err != nil {
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return err
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}
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}
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}
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// ValidName is a stream name that is one safe path component.
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func ValidName(name string) bool {
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return name != "" && name != "." && name != ".." && !strings.ContainsAny(name, "/\\\x00 *>")
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}
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