Hacker News Reader

Comment by ATsch | Hacker News Reader

I think being able to compare or hash IP addresses is a pretty baseline feature for an IP address type. I don't think that's some kind of unpredictable hindsight or tradeoff.

View on HN

Obviously, people routinely compare and hash IP addresses in Go programs.

Out of interest, how do you compare/store in a map? Do you convert to a string, or a [4]byte array (for IPv4), or some other comparable/hashable type?

Either strings or (in the common case where I know I'm dealing with v4) uint32's. In fact, I probably do v6 stuff with uint32s too (I'm never working with an arbitrarily large v6 prefix).

I think this post is right about net.IP, though I also think the solution they've reached is Lovecraftian. But I write Rust, too, and I'd take net.IP over Sockaddr any day of the week.

I assume you mean std::net::SocketAddr? Out of curiosity, what's wrong with it?

I'd assume the lackluster selection of operations and how deeply nested some of the information is within the type. Definitely not the most ergonomic thing.

My personal favorite is probably the python ones. Only annoyance is difficulty of creating modified objects from existing ones.

I can't tell if your're being sarcastic but it's hard to find a program that uses UDP and doesn't at some point store IP addresses in a hashmap. Many more will do the same for per-IP rate limiting. I think those are reasonable use cases for go.

Yes, I ship several of those commercially. Like I said: obviously, people hash and compare IP addresses routinely in Go.

I think the comma made it sound sarcastic where a period would’ve made it clearer you were agreeing.

I don't understand. but I'll consider my commas and periods more carefully next time I comment,

Just not using the built in IP type, which is stupid.

Reply on news.ycombinator.com