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bytecache.go
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bytecache.go
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// Copyright 2022 Namespace Labs Inc; All rights reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
package compute
import (
"context"
"encoding/json"
"io"
"os"
"namespacelabs.dev/foundation/internal/bytestream"
"namespacelabs.dev/foundation/internal/compute/cache"
"namespacelabs.dev/foundation/internal/fnerrors"
"namespacelabs.dev/foundation/schema"
)
func RegisterBytesCacheable() {
RegisterCacheable[[]byte](bytesCacheable{})
RegisterCacheable[bytestream.ByteStream](byteStreamCacheable{})
}
type bytesCacheable struct{}
func (bc bytesCacheable) ComputeDigest(_ context.Context, v interface{}) (schema.Digest, error) {
return cache.DigestBytes(v.([]byte))
}
func (bc bytesCacheable) LoadCached(ctx context.Context, c cache.Cache, t CacheableInstance, d schema.Digest) (Result[[]byte], error) {
bytes, err := c.Bytes(ctx, d)
if err != nil {
return Result[[]byte]{}, err
}
return Result[[]byte]{Digest: d, Value: bytes}, nil
}
func (bc bytesCacheable) Cache(ctx context.Context, c cache.Cache, contents []byte) (schema.Digest, error) {
h, err := cache.DigestBytes(contents)
if err != nil {
return h, err
}
if err := c.WriteBytes(ctx, h, contents); err != nil {
return h, err
}
return h, nil
}
type byteStreamCacheable struct{}
func (bc byteStreamCacheable) ComputeDigest(ctx context.Context, v interface{}) (schema.Digest, error) {
return bytestream.Digest(ctx, v.(bytestream.ByteStream))
}
func (bc byteStreamCacheable) LoadCached(ctx context.Context, c cache.Cache, t CacheableInstance, d schema.Digest) (Result[bytestream.ByteStream], error) {
f, err := c.Blob(d)
if err != nil {
return Result[bytestream.ByteStream]{}, err
}
defer f.Close()
if file, ok := f.(*os.File); ok {
// Need to stat.
if st, err := file.Stat(); err != nil {
return Result[bytestream.ByteStream]{}, fnerrors.InternalError("couldn't get content length of cache entry: %w", err)
} else {
return Result[bytestream.ByteStream]{Digest: d, Value: cachedByteStream{c, d, uint64(st.Size())}}, nil
}
}
return Result[bytestream.ByteStream]{}, fnerrors.New("unexpected cache implementation, couldn't get content length of cache entry")
}
func (bc byteStreamCacheable) Cache(ctx context.Context, c cache.Cache, v bytestream.ByteStream) (schema.Digest, error) {
if cached, ok := v.(cachedByteStream); ok {
// Don't rewrite, it's already cached.
return cached.digest, nil
}
f, err := v.Reader()
if err != nil {
return schema.Digest{}, err
}
digest, err := bytestream.Digest(ctx, v)
if err != nil {
return digest, err
}
if err := c.WriteBlob(ctx, digest, f); err != nil {
return digest, err
}
return digest, nil
}
type cachedByteStream struct {
cache cache.Cache
digest schema.Digest
contentLength uint64
}
var _ bytestream.ByteStream = cachedByteStream{}
func (bs cachedByteStream) ComputeDigest(context.Context) (schema.Digest, error) {
return bs.digest, nil
}
func (bs cachedByteStream) ContentLength() uint64 { return bs.contentLength }
func (bs cachedByteStream) Reader() (io.ReadCloser, error) {
return bs.cache.Blob(bs.digest)
}
func (bs cachedByteStream) MarshalJSON() ([]byte, error) {
return json.Marshal(map[string]interface{}{
"cached": true,
"digest": bs.digest,
"contentLength": bs.contentLength,
})
}