archvillainetteandClaude Fable 5
da59e54261
Implement Backend interface with Probe/Get/Put methods, ProbeState constants, and LocalBackend using filesystem storage with atomic operations and hash verification. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
25 lines
735 B
Go
25 lines
735 B
Go
package depot
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import "context"
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type ProbeState int
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const (
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Present ProbeState = iota
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Absent
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Unconfirmed
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)
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// Backend defines the interface for blob storage backends.
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type Backend interface {
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// Name returns the backend name.
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Name() string
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// Probe returns the existence state of one sha. transient=true means a
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// retry might change the answer (feeds the serial confirm loop).
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Probe(ctx context.Context, sha string) (state ProbeState, transient bool, err error)
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// Get fetches sha into dest (temp file + rename), re-hashes, deletes on mismatch.
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Get(ctx context.Context, sha, dest string) error
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// Put uploads bytes from src for sha. Read-only backends return an error.
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Put(ctx context.Context, sha, src string) error
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}
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