appengine golang logs

[Sankar]

Hi


I have a golang file where I have code like:


log.Fatal("My error message: ", err)


When the above statement is executed, In the appengine logviewer, I get something like:

panic: os.Exit called goroutine 1 [running]:
os.Exit(0x1)
go/src/os/proc.go:58 +0x7c log.Fatal(0xc008549f60, 0x2, 0x2)
go/src/log/log.go:303 +0x79 main.main()
main.go:42 +0x201

But I dont get any error message. The main.go:42 corresponds to the log.Fatal line in my code but I do not get to see the error message that is printed as part of the log statement.

I see that appengine package has a "Log" function which may print the AppLogs such that they can be viewed from the Google Appengine log console itself.

My question is, can the golang default log package be somehow instructed to redirect to appengine ? Something like:

if env == "AppEngine" {

  log.SetOutput(appengine.DefaultLogger) 

}

in my main file ? This way, I get to make my code not locked to google cloud and also can deploy existing code which uses log already.

Any pointers ?

Thanks.

[Jim Cote]

In appengine you have to use google.golang.org/appengine/log package.  The log calls must have a context passed to it.

See https://cloud.google.com/appengine/docs/standard/go/logs/reference.

[Sankar P]

I knew about this package. I mentioned about this in my mail itself :-) 

I wanted a different way as it is not always possible to replace "log" calls in all the existing code. Some libraries need to be used in binaries which will be deployed outside appengine. They should not have a dependency on appengine libraries ideally.

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Sankar P
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[Tamás Gulácsi]

Use log.SetWriter to divert log calls to appenginelog, if deployed there.

[Sankar P]

There is no log.SetWriter in either the builtin log package or the appengine log package. There is a log.SetOutput which I mentioned in my original mail, but I am not able to understand how to connect it to the appengine logs.

2017-11-04 11:44 GMT+05:30 Tamás Gulácsi <tgula...@gmail.com>:

Use log.SetWriter to divert log calls to appenginelog, if deployed there.

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[Gulácsi Tamás]

Sth. along https://play.golang.org/p/BwlbkxMLdw ?

Sankar P <sankar.c...@gmail.com> ezt írta (időpont: 2017. nov. 4., Szo, 8:10):

There is no log.SetWriter in either the builtin log package or the appengine log package. There is a log.SetOutput which I mentioned in my original mail, but I am not able to understand how to connect it to the appengine logs.

2017-11-04 11:44 GMT+05:30 Tamás Gulácsi <tgula...@gmail.com>:

Use log.SetWriter to divert log calls to appenginelog, if deployed there.

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[Sankar P]

Tried something similar already. 

context.Background() does not work with the appengine log package and panics at runtime. Passing nil also did not work.

Probably initialising the AELogAdapter with a ctx from appengine request, in the _ah start handler is the only way. Thanks for the idea.

I, for one, though wish that there was a simpler way. 

2017-11-04 12:47 GMT+05:30 Gulácsi Tamás <tgula...@gmail.com>:

Sth. along https://play.golang.org/p/BwlbkxMLdw ?

Sankar P <sankar.c...@gmail.com> ezt írta (időpont: 2017. nov. 4., Szo, 8:10):

There is no log.SetWriter in either the builtin log package or the appengine log package. There is a log.SetOutput which I mentioned in my original mail, but I am not able to understand how to connect it to the appengine logs.

2017-11-04 11:44 GMT+05:30 Tamás Gulácsi <tgula...@gmail.com>:

Use log.SetWriter to divert log calls to appenginelog, if deployed there.

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Sankar P
http://psankar.blogspot.com

[David Arroyo]

Sankar,

Have you tried using the Flexible environment? Flex provides a more "conventional" environment for your programs. There are some tradeoffs compared with App Engine Standard, but it should be easier to stay portable.

David

[1]: https://cloud.google.com/appengine/docs/flexible/go/writing-application-logs

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[Sankar P]

Thanks. I did not know this. I assumed that the only difference between flexible and standard was the pricing, I was wrong. Thanks for the link.

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