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The tracepoint `validation:block_connected` was introduced in #22006.
The first argument was the hash of the connected block as a pointer
to a C-like String. The last argument passed the hash of the
connected block as a pointer to 32 bytes. The hash was only passed as
string to allow `bpftrace` scripts to print the hash. It was
(incorrectly) assumed that `bpftrace` cannot hex-format and print the
block hash given only the hash as bytes.
The block hash can be printed in `bpftrace` by calling
`printf("%02x")` for each byte of the hash in an `unroll () {...}`.
By starting from the last byte of the hash, it can be printed in
big-endian (the block-explorer format).
```C
$p = $hash + 31;
unroll(32) {
$b = *(uint8*)$p;
printf("%02x", $b);
$p -= 1;
}
```
See also: https://github.com/bitcoin/bitcoin/pull/22902#discussion_r705176691
This is a breaking change to the block_connected tracepoint API, however
this tracepoint has not yet been included in a release.
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https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines.html#c131-avoid-trivial-getters-and-setters
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Can, for example, be used to benchmark block connections.
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Can be used to monitor in- and outbound node traffic.
Based on ealier work by jb55.
Co-authored-by: William Casarin <jb55@jb55.com>
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Both added files are extended in the following commits.
doc/usdt.md is based on earlier work by laanwj.
Co-authored-by: W. J. van der Laan <laanwj@protonmail.com>
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