5eabb61b2386d00e93e6bbb2f493a56d1b326ad9 addrdb: Only call Serialize() once (Martin Zumsande)
da6c7aeca38e1d0ab5839a374c26af0504d603fc hash: add HashedSourceWriter (Martin Zumsande)
Pull request description:
There have been various reports of corruption of `peers.dat` recently, see #26599.
As explained in [this post](https://github.com/bitcoin/bitcoin/issues/26599#issuecomment-1381082886) in more detail, the underlying issue is likely that we currently serialize `AddrMan` twice - once for the file stream, once for the hasher that helps create the checksum - and if `AddrMan` changes in between these two calls, the checksum doesn't match the data and the resulting `peers.dat` is corrupted.
This PR attempts to fix this by introducing and using `HashedSourceWriter` - a class that keeps a running hash while serializing data, similar to the existing `CHashVerifier` which does the analogous thing while unserializing data. Something like this was suggested before, see https://github.com/bitcoin/bitcoin/pull/10248#discussion_r120694343.
Fixes#26599 (not by changing the behavior in case of a crash, but by hopefully fixing the underlying cause of these corruptions).
ACKs for top commit:
sipa:
utACK 5eabb61b2386d00e93e6bbb2f493a56d1b326ad9
naumenkogs:
utACK 5eabb61b2386d00e93e6bbb2f493a56d1b326ad9
Tree-SHA512: f19ad37c37088d3a9825c60de2efe85cc2b7a21b79b9156024d33439e021443ef977a5f8424a7981bcc13d73d11e30eaa82de60e14d88b3568a67b03e02b153b
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