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Adding UX output to dep init #1176
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xmattstrongx
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Sorry this took so long to look at! Remember when we chatted and were like "it seems like a 1 line fix but maybe we are missing something?" 😀 I've realized that these log messages aren't in the right spot. For a small codebase, it looks right but after running on a bigger one (e.g. run The log message alone won't be enough, here's a bit of context on why and what's really happening:
Since the goal is to give feedback, maybe we can ignore the import pathway because dep is already printing information about each dependency as it is imported. There isn't a long period of time where the importer does work but doesn't print anything. The problem area is when we aren't importing anything, then when we call solve during init, it first syncs everything and we get a long period of no output. I suggest that you look into doing an explicit prefetch when we aren't doing an import (that would be when rootM is nil in the function below), making sure to follow Sam's original suggestions on concurrency which are in the original issue (and his comment linked from that issue). Lines 38 to 53 in 0979f44 If this is more than you have time to work on, I realize that I was really late in catching this... Just let me know and I can throw this issue back up for grabs. |
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@carolynvs I should have some time to look in to this deeper this weekend. |
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@carolynvs I have the basic functionality working. I just need to wrap with concurrency and use golang.org/x/sync/errgroup as Sam mentioned. |
carolynvs
suggested changes
Oct 6, 2017
cmd/dep/root_analyzer.go
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| logger := a.ctx.Err | ||
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| syncDep := func(pr gps.ProjectRoot, sm gps.SourceManager) { | ||
| message := fmt.Sprintf("Cached %s", pr) |
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Instead of using fmt directly here and elsewhere in this file, use a.ctx.Err. This let's us capture/discard output more easily in our tests.
cmd/dep/root_analyzer.go
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| return strings.HasPrefix(s, prefix+"/") | ||
| } | ||
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| func isStdLib(path string) bool { |
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This function is already defined in github.com/golang/dep/internal/gps/paths as IsStandardImportPath.
cmd/dep/root_analyzer.go
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| logger.Printf(message) | ||
| } | ||
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| for _, v := range pkgT.Packages { |
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I think that you can usea.directDeps instead of pkgT, which is the set of repositories represented in by the import paths in pkgT. Then we don't need to pass in pkgT or deal with parsing project roots, or skipping duplicates.
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@carolynvs So Ive added the suggested changes as well as the concurrency with max 4 go routines firing the cache calls. For small projects it works well, and fast. However with the kubernetes project I am seeing a bug that I am still working to identify. It seems to fail and hang when trying to get https://bitbucket.org/bertimus9/systemstat. Ive waited for 30+ minutes and it still continues to hang. Output below showing the issue I am describing. Still looking in to it... |
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Update on the error reported above. While it is hanging if I push enter or type 'yes' then the kubernetes dep https://bitbucket.org/bertimus9/systemstat will download as expected. Is this a known bug with deps that require authenticity and require user input to continue? Also notice at the end there is also another issue. This seems unrelated to my changes. |
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Yes, it is expected that the ca cert is trusted for each repo. I added bitbucket.org to my trusted certs so that I don't see that prompt anymore. As for k8's actually working with dep, it doesn't, sorry I should have mentioned that... 😞 It is just a good test for a project with lots of dependencies. I'll take a look in a bit, but if those are the only two issues you ran into, sounds like we are in a good spot! 👍 |
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Awesome! The only thing I havent looked in to yet was Sams mention of |
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The reason to use an errgroup is that when an error/timeout occurs, everything is cancelled:
https://godoc.org/golang.org/x/sync/errgroup#WithContext Here's an example of how to use errorgroup in the dep codebase: Line 71 in a445d4d And here's a post that walks through how it all works: https://www.oreilly.com/learning/run-strikingly-fast-parallel-file-searches-in-go-with-sync-errgroup |
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@carolynvs Awesome! Thank you for sharing that. Glad to have learned something new and useful 😄 New output from kuberenetes |
xmattstrongx
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carolynvs
suggested changes
Oct 11, 2017
cmd/dep/root_analyzer.go
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| "github.com/golang/dep/internal/importers" | ||
| ) | ||
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| const concurrency = 4 |
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Let's move this definition into cacheDeps. If we end up needing it in more places later, we can extract it out then.
cmd/dep/root_analyzer.go
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| @@ -45,6 +52,9 @@ func (a *rootAnalyzer) InitializeRootManifestAndLock(dir string, pr gps.ProjectR | |||
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| if rootM == nil { | |||
| rootM = dep.NewManifest() | |||
| if err := a.cacheDeps(pr); err != nil { | |||
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I think we need a comment that explains why we are doing this right here. 😀
// Since we didn't find anything to import, dep's cache is empty.
// We are prefetching dependencies and logging so that the subsequent solve step doesn't spend a long time retrieving dependencies without feedback for the user.
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Just realized I forgot to push the code with this comment. Will add tonight.
cmd/dep/root_analyzer.go
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| for ip := range a.directDeps { | ||
| logger.Printf("Package %q, analyzing...", ip) | ||
| if paths.IsStandardImportPath(ip) { |
cmd/dep/root_analyzer.go
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| if paths.IsStandardImportPath(ip) { | ||
| continue | ||
| } | ||
| if hasImportPathPrefix(ip, string(pr)) { |
cmd/dep/root_analyzer.go
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| continue | ||
| } | ||
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| pr, err := a.sm.DeduceProjectRoot(ip) |
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So removing this guy seems to be breaking the underlying call SyncSourceFor called by the new syncDep func. Im still investigating
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Ive been trying to use type conversion to pass a "gps.ProjectRoot" without the call to DeduceProjectRoot.
err := syncDep(gps.ProjectRoot(ip), a.sm)
Doing this causes one of the deps to cache over and over again and then end the entire process. Digging in to this now.
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Successfully cached all deps.
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Odd, that is the right thing to do to cast to a ProjectRoot. I wonder if that's really due to other changes you've made to the code?
I really wish that when I had refactored the importers that I had fixed the type on directDeps and used gps.ProjectRoot instead of string. 😀
cmd/dep/root_analyzer.go
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| return err | ||
| } | ||
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| if _, ok := deps[pr]; ok { |
cmd/dep/root_analyzer.go
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| return nil | ||
| } | ||
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| for ip := range a.directDeps { |
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a.directDeps is a unique set of external project roots. So you don't need to track if they have been evaluated already, check if they are stdlib imports, or deduce the root again.
Check out
Line 229 in d10af5e
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Oh I see. Thanks for clarifying. Can definitely remove all of these extra checks then!
cmd/dep/root_analyzer.go
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| deps[pr] = true | ||
| } | ||
| if err := g.Wait(); err == nil { |
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I don't see any handling for when err is not nil?
cmd/dep/root_analyzer.go
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| return nil | ||
| } | ||
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| func hasImportPathPrefix(s, prefix string) bool { |
carolynvs
reviewed
Oct 11, 2017
cmd/dep/root_analyzer.go
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| g.Go(func() error { | ||
| select { | ||
| case sem <- struct{}{}: |
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I realize now that the existing usage of using errgroup in dep was not the best/canonical example to have pointed you to.
I would rather not use this extra sem channel to handle bounded parallelism and instead use the pattern from the errgroup documentation:
https://godoc.org/golang.org/x/sync/errgroup#example-Group--Pipeline
In that example, they start a fixed number of goroutines instead of a goroutine per work item (look for numDigesters), and range over a channel of input values (in our case that would be the project roots).
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@carolynvs Added in concurrency changes for errGroup. Demo of latest output when calling dep init on kubernetes. |
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carolynvs
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Oct 24, 2017
cmd/dep/root_analyzer.go
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| defer close(deps) | ||
| for ip := range a.directDeps { | ||
| logger.Printf("Package %q, analyzing...", ip) | ||
| pr, err := a.sm.DeduceProjectRoot(ip) |
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directDeps is a map of project roots (see below for how it is populated), so you can change the for loop to for pr := range a.directDeps, and remove the call to DeduceProjectRoot.
Lines 238 to 242 in bf8f295
cmd/dep/root_analyzer.go
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| return nil | ||
| }) | ||
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| go func() { |
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The godoc example used this goroutine with g.Wait() to ensure that they closed the output channel when everything was done (or there was an error). Since we aren't using that, I believe 107-109 can be removed.
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correct. nice catch. This was leftover cruft from when I was working out some bugs in my concurrency
cmd/dep/root_analyzer.go
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| logger.Printf("Unable to cache %s - %s", pr, err) | ||
| return err | ||
| } | ||
| logger.Printf("Cached %s", pr) |
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Looking at the output, I think it would be clearer if we cut down a bit on how much we are printing. Let's remove this print statement so that we are only logging when we start caching a package, and when the caching fails.
So the output would look more like this:
Caching package github.com/example/A
Caching package github.com/example/B
Caching package github.com/example/C
Successfully cached all deps.
cmd/dep/root_analyzer.go
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| g.Go(func() error { | ||
| defer close(deps) | ||
| for ip := range a.directDeps { | ||
| logger.Printf("Package %q, analyzing...", ip) |
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Let's change this to Caching package %q because we aren't actually analyzing anything.
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@carolynvs comments address. New output after changes: |
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Yay! Thank you for adding this, it should really help with the "wtf is dep doing?!" moments. 🎉 💖 |
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Include #1176 in the changelog
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What does this do / why do we need it?
Provides some output during dep init to help soften the user experience where people think the tool is hanging.
What should your reviewer look out for in this PR?
For now this WIP PR is just to start the discussion of how to bring back functionality similar to what was added before in.
https://github.com/golang/dep/pull/194/files#diff-b14a2eb16f1efbc6aa9f1ffdad724265R241
Do you need help or clarification on anything?
Yes. For now I just have something very rudimentary that displays when a new direct dep found. To regain functionality from #194 there also needs to be output when transitive deps are discovered. I believed this should be done in
s.Solve(). Still digging in.Which issue(s) does this PR fix?
fixes #1144
DEMO