Ah, I perhaps should be using node's spawnSync instead. But I'm still interested in what you think because perhaps in the future I might want to write a synchronous wrapper for some other js library which doesn't provide a sync alternative out of the box.
On Wednesday, January 6, 2016 at 1:48:14 PM UTC-8, fah...@gmail.com wrote: > > I'm using ClojureScript and nodejs and I'd like to spawn a child process > and deal with the result (stderr, stdout, exit code). > > Here's a short gist > <https://gist.github.com/frankhenderson/d60471e64faec9e2158c> showing an > approach that spawns the process and routes all output to a channel. My > goal is to allow the calling code to be written in a straightforward manner > instead of having a lot of callbacks. > > 1. Is using a channel the right idea for avoiding callback hell? > 2. I'm routing all three (stderr, stdout, and exit code) to the same > channel instead of using a channel for each because it seemed to me that > the latter approach would start to feel like callback hell -- 3 separate > handling fns vs dealing with a single result vector. On the other hand, > whatever code has to handle that single vector, would have those three > ideas combined. But I think that's okay.. the ideas stand together. Would > you agree? > 3. My attempt at avoiding callbacks only lets the calling code deal > with the output after the child_process exits instead of along-the-way as > the output occurs. Is there a better way that avoids callbacks and yet > allows the code to deal with the output as it happens? > 4. On line 29 there is a commented-out attempt at adding a timeout. > When I use that line instead of 28, I get a Error: No protocol method > ICounted.-count defined for type > cljs.core.async.impl.channels/ManyToManyChannel. What am I doing wrong? I > suppose if it worked, I should change the code to return the process p so > it can be killed with a js call if the timeout occurs. > 5. Is it correct that I can only access the resulting vector from > 'exec' within a go-block? Or.. how does one get something out of the go > 'environment' back into normal code? > > Thanks in advance! > > > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
