Hey Nick & Kyle, @Nick Yes I do need to call App Engine services in response to WebSocket requests. There are multiple issues here and I'm trying to work around them
to sum things up: - WebSocket connections are not supported in the Classic App Engine OR the HTTP load balancers - The App Engine log API does not export API for writing specific log entries and the BackgroundContext logs get cluttered @Kyle You probably could not connect to your MVM instance because the default firewall rule forbids access to port 80, try :8080 instead After browsing the thread you linked to I have found this <https://godoc.org/google.golang.org/cloud/logging#Client.Log> API, which I will look into and might help me mitigate App Engine's lack of finer resolution log infrastructure. Thanks again, John On Wednesday, December 23, 2015 at 7:03:47 AM UTC+2, Kyle Finley wrote: > > John, > > I just tested accessing my VM by IP. Unfortunately the request timed out: > > curl: (7) Failed to connect to 23.XX.XX.XX port 80: Operation timed out > > > Incase you haven't seen it yet. There's a thread in the App Engine Go > group where the issue with background context logging is discussed. There's > a few alternatives suggested. > > > https://groups.google.com/forum/#!searchin/google-appengine-go/background/google-appengine-go/V90qiZKJ5Tk/CWiXsxkNDgAJ > > I hope you find a solution I'll be looking into websockets in the near > future. > > Kyle > > On Tuesday, December 22, 2015 at 9:15:28 AM UTC-6, John Smith wrote: >> >> Hey Kyle, >> >> yes I am using appengine.Main() to start serving requests. >> did you try to access your VMs directly? (by IP, or by >> network-load-balancer) >> >> (note: when using google's default my-game.appspot.com >> appengine.NewContext works but WebSockets dont) >> >> Thanks >> >> >> On Tuesday, December 22, 2015 at 4:16:56 PM UTC+2, Kyle Finley wrote: >>> >>> John, >>> >>> Are you calling appengine.Main() in your main() function? >>> >>> I'm not sure if it works with the network-load-balancer, but when I >>> switched from classic to MVM I was receiving the same error. Adding the >>> appengine.Main() call fixed the unknown http.Request error. >>> >>> Kyle >>> >>> e.g. >>> >>> package main >>> >>> import ( >>> "google.golang.org/appengine" >>> ) >>> >>> func main() { >>> appengine.Main() >>> } >>> >>> On Tuesday, December 22, 2015 at 7:42:16 AM UTC-6, John Smith wrote: >>>> >>>> Hey Nick, >>>> >>>> Thank you for your response, I would like to further clarify the flow >>>> of things: >>>> >>>> - I have to use WebSockets >>>> - WebSockets are not supported on the Classic App Engine (when I >>>> attempt to open a websocket connection to my-game.appspot.com it is >>>> being filtered out and not even making it to my app code) >>>> - WebSockets seem to work on MVM via a network-load-balancer >>>> <https://cloud.google.com/compute/docs/load-balancing/network/> (and >>>> not via the default my-game.appspot.com domain) >>>> - using MVM and a network-load-balancer I cannot create a request >>>> context [to create a new context I use the supplied >>>> appengine.NewContext(r) >>>> function and get the mentioned error] >>>> - I need a context to use the datastore.GetMulti() or log.Debugf() >>>> APIs >>>> - I am able to create a background context (supported by MVM) and >>>> use these APIs but when I use this context (with the >>>> appengine/log.Debugf() >>>> API) the logs get cluttered (aggregated under /_ah/background) >>>> >>>> >>>> 1. are the above points clarify how my app receives requests? >>>> 2. no, when a request is dispatched via network-load-balancer (and >>>> not my-game.appspot.com) my application gets no X-Appengine-* >>>> headers at all >>>> 3. yes all of my logs are piling up under one /_ah/background >>>> entry. as mentioned above I am using the golang standard appengine/log >>>> library as I did with my previous Classic App engine. >>>> >>>> >>>> ideally the appengine.NewContext(r) function would work and logging via >>>> the appengine/log.Debugf() would split the lines per request. >>>> do you find this explanation sufficient? >>>> >>>> Thanks. >>>> >>>> >>>> >>>> On Tuesday, December 22, 2015 at 12:21:02 AM UTC+2, Nick (Cloud >>>> Platform Support) wrote: >>>>> >>>>> As someone somewhat familiar with the Go runtime but not with your >>>>> exact use case, I'd like to help, but I'm wondering if you could provide >>>>> some more concrete specification of the following from your post, in >>>>> terms >>>>> of code or logs: >>>>> >>>>> While porting my app from the Classic App Engine I was facing an issue >>>>>> with the request context (which now "skips" the default HTTP load >>>>>> balancer >>>>>> and goes straight to my MVM(gce) node). >>>>>> >>>>> >>>>> >>>>>> I was getting an error ("appengine: NewContext passed an unknown >>>>>> http.Request"). >>>>>> >>>>> >>>>> >>>>>> To overcome my need for datastore/logging/other App Engine facilities >>>>>> I used context.BackgroundContext() everywhere and it seemed to work well >>>>>> for the datastore/urlfetch/etc.. >>>>> >>>>> >>>>> This might help me to reproduce your situation and attempt different >>>>> solutions. >>>>> >>>>> As to your numbered questions, here are my first responses: >>>>> >>>>> 1. Are you talking about "Network Loadbalancing >>>>> <https://cloud.google.com/compute/docs/load-balancing/network/>" or >>>>> the GCE "Http Load balancer >>>>> <https://cloud.google.com/container-engine/docs/tutorials/http-balancer>", >>>>> >>>>> and could you clarify again what kind of errors you observed when >>>>> attempting this? What is meant by context "skipping"? >>>>> >>>>> 2. Do you notice that you're receiving X-Appengine-* headers? If so, >>>>> you can certainly use them. If you attempt to add them to requests, do >>>>> you >>>>> notice if they're stripped? If they are, it won't work, if they aren't, >>>>> it >>>>> will. Although this is a quite empirical way to proceed, and if something >>>>> isn't explicitly documented, you should file a Public Issue Tracker >>>>> feature request >>>>> <http://code.google.com/p/google-appengine/issues/list> to have the >>>>> behaviour defined. >>>>> >>>>> 3. Your log lines are all piling up under one /_ah/background entry, >>>>> as far as I can tell. You could use the Logging API >>>>> <https://cloud.google.com/logging/docs/api/tasks/creating-logs> to >>>>> write logs, and see if that shows up properly. Another option is logging >>>>> to >>>>> a BigQuery or SQL table. The final, most trivial answer, is to figure out >>>>> how to get request logging to work without this BackgroundContext which >>>>> seems to flatten all its logs into one expando in the Developers Console >>>>> UI >>>>> (if I'm understanding you correctly, again, it seems like this is what >>>>> you're reporting). >>>>> >>>>> 4. A better approach could only be found through further >>>>> investigation, if it exists. I'm optimistic that a better approach is out >>>>> there, it would just take more thought. >>>>> >>>>> On Sunday, December 20, 2015 at 11:17:12 AM UTC-5, John Smith wrote: >>>>>> >>>>>> *TL;DR: *Need to use WebSockets on AE. Only works on MVM. NewContext >>>>>> fails, BackgroundContext works. Logs are polluted & disorganized >>>>>> (/_ah/background) >>>>>> >>>>>> Hey, >>>>>> >>>>>> I would like to communicate with my App Engine app over WebSockets. >>>>>> I have found that the Java library has an official (github) example >>>>>> of using WebSockets under the Managed VMs framework, >>>>>> after browsing the implementation I noticed that it queries the >>>>>> internally exposed metadata service to get the external IP of the >>>>>> machine >>>>>> and redirects the client to it. >>>>>> >>>>>> However I expect my application to receive more traffic than a single >>>>>> server would handle and so I need a load-balanced solution (cannot relay >>>>>> on >>>>>> a single static-IP) >>>>>> so I've looked into App Engine's "Network Load Balancer" and after an >>>>>> hour (and a long deploy time) I was up and running with now my >>>>>> domain set to the load balancer's static IP. >>>>>> >>>>>> Now is a good time to note that I use the Go standard runtime. >>>>>> While porting my app from the Classic App Engine I was facing an >>>>>> issue with the request context (which now "skips" the default HTTP load >>>>>> balancer and goes straight to my MVM(gce) node). >>>>>> I was getting an error ("appengine: NewContext passed an unknown >>>>>> http.Request"). >>>>>> To overcome my need for datastore/logging/other App Engine facilities >>>>>> I used context.BackgroundContext() everywhere and it seemed to work well >>>>>> for the datastore/urlfetch/etc.. >>>>>> >>>>>> Everything worked but the logging facility which was polluting my >>>>>> logs with empty "/_ah/background" lines and everything else was >>>>>> multiplexed >>>>>> into a single huge "/_ah/background" entry. >>>>>> This makes it very difficult to debug or monitor my application. >>>>>> >>>>>> I have browsed the google.golang.org/appengine package and tried to >>>>>> split the log lines to no avail. >>>>>> >>>>>> >>>>>> My questions are: >>>>>> 1) Can I use the classic App Engine/default http load balancer/custom >>>>>> http load balancer to service my WebSocket requests? >>>>>> 2) Can I, with my current solution, get the X-AppEngine-* headers? >>>>>> 3) How could I, with my current solution, split the log lines to per >>>>>> request entries (very like the classic app engine logs) >>>>>> 4) Is this the right approach? >>>>>> >>>>>> Thanks. >>>>>> >>>>> -- You received this message because you are subscribed to the Google Groups "Google App Engine" group. 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