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core/rawdb: support freezer batch read with no size limit (#27687)

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This change adds the ability to perform reads from freezer without size limitation. This can be useful in cases where callers are certain that out-of-memory will not happen (e.g. reading only a few elements). 

The previous API was designed to behave both optimally and secure while servicing a request from a peer, whereas this change should _not_ be used when an untrusted peer can influence the query size.
This commit is contained in:
rjl493456442
2023-07-12 03:19:01 -04:00
committed by GitHub
parent cecd22143b
commit 0b1f97e151
5 changed files with 86 additions and 23 deletions
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ethdb/database.go
+4 -3
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@@ -79,9 +79,10 @@ type AncientReaderOp interface {
// AncientRange retrieves multiple items in sequence, starting from the index 'start'.
// It will return
// - at most 'count' items,
// - at least 1 item (even if exceeding the maxBytes), but will otherwise
// return as many items as fit into maxBytes.
// - at most 'count' items,
// - if maxBytes is specified: at least 1 item (even if exceeding the maxByteSize),
// but will otherwise return as many items as fit into maxByteSize.
// - if maxBytes is not specified, 'count' items will be returned if they are present
AncientRange(kind string, start, count, maxBytes uint64) ([][]byte, error)
// Ancients returns the ancient item numbers in the ancient store.