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Improve ObjectFormat interface (#28496)

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The 4 functions are duplicated, especially as interface methods. I think
we just need to keep `MustID` the only one and remove other 3.

```
MustID(b []byte) ObjectID
MustIDFromString(s string) ObjectID
NewID(b []byte) (ObjectID, error)
NewIDFromString(s string) (ObjectID, error)
```

Introduced the new interfrace method `ComputeHash` which will replace
the interface `HasherInterface`. Now we don't need to keep two
interfaces.

Reintroduced `git.NewIDFromString` and `git.MustIDFromString`. The new
function will detect the hash length to decide which objectformat of it.
If it's 40, then it's SHA1. If it's 64, then it's SHA256. This will be
right if the commitID is a full one. So the parameter should be always a
full commit id.

@AdamMajer Please review.
This commit is contained in:
Lunny Xiao 2023-12-19 15:20:47 +08:00 • committed by GitHub
parent 128eac9e0b
commit 4eb2a29910
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39 changed files with 109 additions and 168 deletions
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35
modules/git/object_format.go
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@ -6,6 +6,7 @@ package git
import (
"crypto/sha1"
"regexp"
"strconv"
)
// sha1Pattern can be used to determine if a string is an valid sha
@ -20,14 +21,12 @@ type ObjectFormat interface {
EmptyTree() ObjectID
// FullLength is the length of the hash's hex string
FullLength() int
// IsValid returns true if the input is a valid hash
IsValid(input string) bool
// MustID creates a new ObjectID from a byte slice
MustID(b []byte) ObjectID
MustIDFromString(s string) ObjectID
NewID(b []byte) (ObjectID, error)
NewIDFromString(s string) (ObjectID, error)
NewHasher() HasherInterface
// ComputeHash compute the hash for a given ObjectType and content
ComputeHash(t ObjectType, content []byte) ObjectID
}
type Sha1ObjectFormatImpl struct{}
@ -59,20 +58,18 @@ func (Sha1ObjectFormatImpl) MustID(b []byte) ObjectID {
return &id
}
func (h Sha1ObjectFormatImpl) MustIDFromString(s string) ObjectID {
return MustIDFromString(h, s)
}
// ComputeHash compute the hash for a given ObjectType and content
func (h Sha1ObjectFormatImpl) ComputeHash(t ObjectType, content []byte) ObjectID {
hasher := sha1.New()
_, _ = hasher.Write(t.Bytes())
_, _ = hasher.Write([]byte(" "))
_, _ = hasher.Write([]byte(strconv.FormatInt(int64(len(content)), 10)))
_, _ = hasher.Write([]byte{0})
func (h Sha1ObjectFormatImpl) NewID(b []byte) (ObjectID, error) {
return IDFromRaw(h, b)
}
func (h Sha1ObjectFormatImpl) NewIDFromString(s string) (ObjectID, error) {
return genericIDFromString(h, s)
}
func (h Sha1ObjectFormatImpl) NewHasher() HasherInterface {
return &Sha1Hasher{sha1.New()}
// HashSum generates a SHA1 for the provided hash
var sha1 Sha1Hash
copy(sha1[:], hasher.Sum(nil))
return &sha1
}
var Sha1ObjectFormat ObjectFormat = Sha1ObjectFormatImpl{}