undefined | Better HN

0 pointsJoeAcchino8y ago0 comments

Would this work?

  c := colly.NewCollector()

  // this functions create a goroutine and returns a channel
  ch := c.HTML("a")  
  e := <- ch
  link := e.Attr("href")
  // ...

I'm a bit rusty (ah!) with go, so bear with me if the above contains errors.

0 comments

asciimoo8y ago

How do you recognize if the collector has finished? If the site doesn't contain "a" elements (e.g. because of a network error), this example would block forever.

dward8y ago

The producer closes the channel. This is differentiable from an open empty channel in a select.

asciimoo8y ago

Makes sense, thanks =)

In the above example this would require `nil` checking of the retrieved value every time. I'm not sure if it would make the API cleaner

maxpert8y ago

This would work. No callback hell a pleasure for eyes!

j / k navigate · click thread line to collapse

0 pointsJoeAcchino8y ago0 comments

Would this work?

  c := colly.NewCollector()

  // this functions create a goroutine and returns a channel
  ch := c.HTML("a")  
  e := <- ch
  link := e.Attr("href")
  // ...

I'm a bit rusty (ah!) with go, so bear with me if the above contains errors.

0 comments

asciimoo8y ago

How do you recognize if the collector has finished? If the site doesn't contain "a" elements (e.g. because of a network error), this example would block forever.

dward8y ago

The producer closes the channel. This is differentiable from an open empty channel in a select.

asciimoo8y ago

Makes sense, thanks =)

In the above example this would require `nil` checking of the retrieved value every time. I'm not sure if it would make the API cleaner

maxpert8y ago

This would work. No callback hell a pleasure for eyes!

j / k navigate · click thread line to collapse