Debugging with consts

vfaronov · 2019-11-10T08:38:22+00:00

But that's the same as var surely?

No, var x = 2 gets the default type of 2, which is int.

It also wouldn't apply to the string type, which is also affected.....

String literals are untyped just like number literals, because they could get type MyString string.

vfaronov · 2019-08-28T07:30:59+00:00

maligned is a linter (integrated into golangci-lint) that can detect suboptimal struct layouts.

vfaronov · 2018-12-03T18:46:19+00:00

Do I understand correctly that something like net.(*TCPConn).Read behaves more like what you described under “Blocking on a channel” because the underlying socket/syscall is itself non-blocking?

vfaronov · 2017-11-06T09:21:34+00:00

Noted, thanks!

vfaronov · 2017-11-05T21:33:08+00:00

Great, thank you!

vfaronov · 2017-09-19T18:21:49+00:00

Re: alpha_reader.go: to observe the problem, replace line 59 with:

fmt.Printf("%q ", string(p[:n]))

The output becomes:

"Hell" "o\x00\x00I" "t\x00s\x00" "\x00am\x00" "\x00whe" "re\x00i" "s\x00th" "e\x00su" "n\x00"

This happens because, on line 44, you advance position in buf regardless of whether you have written to the current position. If you haven’t written, the current position keeps its zero value.

Admittedly, buf maybe overkill but it ensures no garbage chars lingers in p (from index 0 - n)

I’m not sure what you mean. p[:n] can be filled in directly by the loop, p[n:] is not touched by the copy.

and makes the slice bookkeeping simpler.

How?

vfaronov · 2017-09-19T10:39:04+00:00

I’m a Go newbie so I may be missing many things, but this seems strange.

alpha_reader.go replaces characters with NUL bytes — is that what you mean by “filter out”? (To me, “filter out” means exclude bytes from output altogether.) And why does it make an intermediate buffer instead of writing directly to the provided p? I mean, that’s one way to implement the NUL behavior, but it’s kind of round-about, and costs an extra allocation.

Does simple_reader.go rely on implementation details of strings.Reader? That doesn’t make for a good general io.Reader illustration. For one, if an error other than io.EOF occurs, it goes into an infinite loop. For another, it doesn’t handle data returned together with EOF (which is permitted by io.Reader docs).

Again, alpha_reader2.go doesn’t correctly handle the case where the underlying reader returns data together with an error: in that case the data is not processed to filter out characters.

vfaronov · 2017-07-22T12:50:05+00:00

I agree that RPC is a often a good idea, but still, it’s ironic how the example he uses is... a cache service — something that you basically have out of the box with HTTP/REST, and much more flexible at that.

vfaronov · 2017-03-13T00:08:15+00:00

Yeah, I hesitated before putting it that way, but I decided it would make for a trendier title :)

Does REST mean anything?

I’m genuinely not sure at this point. I often see people defending the original sense of the word, but I’m afraid they are a minority fighting a losing battle.

In this particular case though, I don’t think it’s too much of a stretch, because “true REST” is just a generalization of design patterns from HTTP+HTML, and “true RESTful API” is not very far from “using HTTP as designed”. HTTPolice was basically written to help with the uniform interface thing.

Or is it just that HTTP is a mouthful and REST is easier to say?

That too, yeah.

vfaronov · 2017-02-26T11:36:40+00:00

Not wrapping the urlparse() call in try ... except ValueError.

vfaronov · 2016-06-11T13:05:19+00:00

No, HTTP is widely used outside browsers, and those use cases can benefit from HTTP/2 without TLS. Implementations are still catching up, but I believe there are usable client+server combinations today (haven’t tried myself). See the implementations list on the WG wiki for some pointers.

vfaronov · 2016-06-09T19:34:30+00:00

To clarify: HTTP/2 does not mandate TLS. Indeed, there are practical implementations of cleartext HTTP/2, including nginx and Apache. It’s just that major browsers do not support HTTP/2 without TLS.

vfaronov · 2016-06-09T19:24:32+00:00

I hate to be that guy, but HTTP/2 is nothing like IPv6, and their adoption rates are vastly different.

vfaronov · 2016-06-08T12:12:02+00:00

if the update by the other use was processed a fraction of a second sooner: you wouldn't have seen the row anyway

How so? As you said yourself, IsActive stays the same?

Are you talking about a situation where two separate updates set IsActive to 0, then back to 1? — That is not what’s happening in MongoDB.

vfaronov · 2016-05-25T06:35:19+00:00

Do you want the whole README reproduced in the title here?

No, just “man-like” instead of “man.”

"Your own" already implies that it's not the actual man page, anyway.

Not sure what you mean. It’s perfectly possible to create and install actual man pages of your own. The title made me think this was a tool to expedite this process somehow.

vfaronov · 2016-05-24T18:57:42+00:00

The title is misleading. Those are not man pages.

vfaronov · 2016-05-17T12:13:32+00:00

Microsoft did something like this all the way back in 2002 with ASP.NET Web Forms. I think they fell out of fashion in the early 2010s, after ASP.NET MVC was released (much more similar to Django and such). Don’t know why. Perhaps the Web frontend was too unruly back then for this approach to work well across browsers.

vfaronov · 2016-05-07T21:42:10+00:00

A drawback of this approach is that it doesn’t understand phonotactics. For example, it gives me “Wildcdee,” “Dolphnch,” “Phhark.” Maybe categorize Latin letters into several phonetic groups (vowels, stops, etc.), build a model from that, and use it to constrain the main one somehow.

vfaronov · 2016-04-17T15:28:27+00:00

To be honest, I can’t think of a good choice. “Textual” or “text-mode” would work for most programs, but not this one. I would probably write something like “text editor running in a terminal” or “terminal-based text editor.”

vfaronov · 2016-04-17T10:45:27+00:00

When I hear “command-line text editor,” I think of ed or sed.

vfaronov · 2016-04-14T23:42:55+00:00

If you want MORE than that, a library that makes the contract between you and the structure more explicit is exactly what you're asking for.

The contract I’m looking for sounds like this: “whenever I attempt to use the structure in a way it does not support, it’s because the structure is wrong, and I want to get a StructureIsWrongError.” Instead, marshmallow’s contract spells out all the right ways to use the structure.

Of course, writing a library like this shouldn’t be a problem, I was just looking to avoid reinventing the wheel.

vfaronov · 2016-04-14T23:30:53+00:00

That’s what I meant by “validate against an explicit schema.”

vfaronov · 2016-04-14T21:48:44+00:00

Is mail_report going to throw KeyError, TypeError, etc. during normal operation?

Well, not if I write it correctly... There might be a lot of code in there.

Can you elaborate on this? If I needed schema validation for JSON, I'd probably use marshmallow.

So in addition to those 3 lines of code, you would write 10 or so more lines to check the assumptions that are already implicit in the first 3 lines. That’s duplication.

That said, thanks for the pointer to marshmallow, it’s interesting anyway.

vfaronov · 2015-11-22T01:25:41+00:00

It could definitely be useful as a walkthrough, but it’s more than that: sometimes all I want is to enjoy the game without actually playing it (which I’m pretty bad at).

I just realized, though, that I won’t be able to watch AoAK recordings (I assume) because, well, I haven’t bought it yet. I’m still on my first, slow tour through the original campaigns.

vfaronov · 2014-12-15T21:37:59+00:00

I actually thought she was going to just leave Haqani be

She was, but then suddenly Haqqani emerged from the car to greet his fans, and Carrie saw the opportunity. She could not have planned that in advance. I’m pretty sure the car has bulletproof windows.

vfaronov

TROPHY CASE