Add hashGlobs query to state service #3484
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MDrakos
commented
Sep 9, 2024
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MDrakos
commented
 DX-3032 We have a query on the state-svc for calculating a hash for a series of globs
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internal/hash/file_hasher.go
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| "github.com/ActiveState/cli/internal/errs" | ||
| "github.com/cespare/xxhash" |
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xxhash is a fast hash algorithm. For more info see here: https://xxhash.com/
this link is safe for work
internal/hash/file_hasher.go
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| fh.cache.Set(cacheKey(file.Name(), fileInfo.ModTime()), hash, cache.NoExpiration) | ||
| fmt.Fprintf(hasher, "%x", hash) |
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What does this do? Might need a comment, or drop if it's for debugging.
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Added a comment. The hasher is an io.Writer so this is writing the hash of the current file to the overall hash.
internal/hash/file_hasher.go
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| fmt.Fprintf(hasher, "%x", hash) | ||
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| return base64.StdEncoding.EncodeToString(hasher.Sum(nil)), nil |
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Does the hasher itself not produce a usable string?
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hasher.Sum() returns a slice of bytes and I don't believe these values are guaranteed to be printable characters. They could be control characters or invalid UFT-8 sequences. The encoding ensures that the output is safe to print and transmit.
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| func (fh *FileHasher) HashFiles(files []string) (string, error) { | ||
| func (fh *FileHasher) HashFiles(files []string) (hash string, rerr error) { |
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| func (fh *FileHasher) HashFiles(files []string) (hash string, rerr error) { | |
| func (fh *FileHasher) HashFiles(files []string) (string, error) { |
Doesn't look like naming these is used for anything. And it can actually cause bug so better to avoid.
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Forgot that we need the named error return for the deferred error handling https://github.com/ActiveState/cli/pull/3484/files#diff-f95330cc381d368f14952fbad1b24b3a714997bab5851fba341014a2271774d0R41
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ah I see. In that case I suggest renaming hash to _, so it doesn't clash with your code. You are using a hash var in the function body. I don't think it clashes as currently written, but it feels error-prone.
Co-authored-by: Nathan Rijksen <[email protected]>
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| func (fh *FileHasher) HashFiles(files []string) (string, error) { | ||
| func (fh *FileHasher) HashFiles(files []string) (hash string, rerr error) { |
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ah I see. In that case I suggest renaming hash to _, so it doesn't clash with your code. You are using a hash var in the function body. I don't think it clashes as currently written, but it feels error-prone.
