[go-nuts] Re: global var available in different files (same package)
On Friday, June 7, 2019 at 6:07:09 PM UTC+2, jake...@gmail.com wrote:
>
>
>
> It is unclear what the problem is. Global variables will be accessible
> from any file that is part of package "main". As you said, you could
> convert the strings in main(), then put them in some global variables, for
> use by you other functions. That way you wold not have to be passing them
> around. Or am I missing something?
>
yes, I understand it's unclear, if you do not fully understand something
it's difficult to put it into words.
What I mean is that if I convert the var url URL to a string type variable
(in this case I need to pass the uri around I get from the cli flag), and
this conversion takes places forcefully after parsing the cli args, in func
main(), then the new string variable is not passed to the second file. I
need to pass it as an argument to the function I want to execute in the
second file.
so first file:
func main()
{
kingpin.MustParse(app.Parse(os.Args[1:]))
uri :=
*url
fmt.Println(uri.String(), "from
main.go")
whatever()
}
second file:
func whatever() {
fmt.Println(uri.String(), "from ww.go")
}
$ go run *.go -u kk
# command-line-arguments
./ww.go:10:14: undefined: uri
But the url var is available, I just need to unpack it everytime, which is
tedious.
I hope I made it clearer now. It's not really an issue but a question to
find a better way if possible ;-)
Thanks,
regards,
Natxo
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[go-nuts] global var available in different files (same package)
hi,
I'd like to define a couple of global variables in a small cli app. The app
has a few files but it's not large.
What I'd like is to use cli flags to define options, and those options
should be available for all the functions. I quite like the fact that the
content of the variables is checked for correctnes.
Code (using kingpin):
==kinpingtest.go=
package main
import (
"gopkg.in/alecthomas/kingpin.v2"
"os"
)
var (
app= kingpin.New("shittytest", "shitty kingpin test")
url= app.Flag("url", "url for app").Required().Short('u').URL()
domain = app.Flag("domain", "domain for
app").Short('d').Required().String()
)
func main() {
kingpin.MustParse(app.Parse(os.Args[1:]))
whatever()
}
end kingpintest.go
and second file:
=otherfile.go
package main
import (
"fmt"
)
func whatever() {
u := *url
fmt.Println(u.String() + "/that")
fmt.Println(*domain)
}
===endotherfile.go===
And quit unsurprisingly, running it:
$ go run *.go --url http://this.com --domain kk.kk
http://this.com/that
kk.kk
The 'problem' I have is that I cannot use the variables directly and have
to convert them to strings first, and as far as I can see I cannot do that
globally because the kingpin arguments get parsed in main().
I see one possible solution, and that is to convert the vars to strings in
main() and pass those as arguments to funcs called from main().
Are there better options for what I want to achieve (certainly must be, I
am just a go newbie)?
Thanks in advance.
Regards,
Natxo
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Re: [go-nuts] trouble passing an argument to a script
On Tue, Feb 26, 2019 at 10:58 AM Natxo Asenjo
wrote:
>
> hi,
>
> On Tuesday, February 26, 2019 at 10:51:28 AM UTC+1, Sebastien Binet wrote:
>>
>> from the compilation error, it would seem kingpin.Flag...ExistingFile()
>> returns a *string, not a string.
>> so these lines:
>> fmt.Printf("%v, %s, %T\n", config, config, config)
>> cfg, err := ini.Load(config)
>> should be replaced with:
>> fmt.Printf("%v, %s, %T\n", *config, *config, *config)
>> cfg, err := ini.Load(*config)
>>
>> Thanks!
>
> I had indeed already tried that but alas:
>
> $ go run kk.go --config api.conf
> , , string
> open : no such file or directory
> exit status 1
>
> after dereferencing config, it appears to be empty.
>
>
it appears that defining the config variable and the other variables
globally does not work. If I define the url/api/user/pwd in main(), then I
can use the config variable as expected (indeed with a pointer *config).
Thanks for the tip.
--
regards,
natxo
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Re: [go-nuts] trouble passing an argument to a script
hi,
On Tuesday, February 26, 2019 at 10:51:28 AM UTC+1, Sebastien Binet wrote:
>
> from the compilation error, it would seem kingpin.Flag...ExistingFile()
> returns a *string, not a string.
> so these lines:
> fmt.Printf("%v, %s, %T\n", config, config, config)
> cfg, err := ini.Load(config)
> should be replaced with:
> fmt.Printf("%v, %s, %T\n", *config, *config, *config)
> cfg, err := ini.Load(*config)
>
> Thanks!
I had indeed already tried that but alas:
$ go run kk.go --config api.conf
, , string
open : no such file or directory
exit status 1
after dereferencing config, it appears to be empty.
Scratching my head ...
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[go-nuts] trouble passing an argument to a script
hi,
I am writing a script that accepts arguments and flags (using kingpin) but
am failing miserably so far. One of the arguments is a file name, which
should be then loaded by an ini library (file is in ini format).
If I hard code the file name in the script, it works, but
Code:
=start
package main
import (
"fmt"
"gopkg.in/alecthomas/kingpin.v2"
"gopkg.in/ini.v1"
"os"
)
var (
config = kingpin.Flag("config", "configuration
file").Short('c').Required().ExistingFile()
url, api, user, pwd = parse_config()
)
func init() {
kingpin.Parse()
}
func main() {
fmt.Println("yay")
}
func parse_config() (string, string, string, string) {
//cfg, err := ini.Load("api.conf")
fmt.Printf("%v, %s, %T\n", config, config, config)
cfg, err := ini.Load(config)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
url := cfg.Section("").Key("url").String()
api := cfg.Section("").Key("api").String()
user := cfg.Section("").Key("user").String()
pwd := cfg.Section("").Key("password").String()
return url, api, user, pwd
}
=end
and when running it:
$ go run yetanother.go --config api.conf
0xc547e0, %!s(*string=0xc547e0), *string
error parsing data source: unknown type '%!s(*string=0xc8ceb0)'
exit status 1
This must be pretty basic, but I'm stuck :(
Any tips welcome.
Thanks in advance.
--
regards,
Natxo
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Re: [go-nuts] [crypto/x509] SystemCertPool() print subjects of ca certs
On Wednesday, October 31, 2018 at 10:46:41 PM UTC+1, golan...@geek1.de
wrote:
>
> Hy Natxo,
>
> check out the pkix [0] and asn1 [1] packages. You can try to parse the
> DER encoded subject into RDNSequence.
>
> [0]: https://golang.org/pkg/crypto/x509/pkix/#RDNSequence
> [1]: https://golang.org/pkg/encoding/asn1/#Unmarshal
>
> Spoiler:
>
> This should work:
>
> package main
>
> import "fmt"
> import "crypto/x509"
> import "encoding/asn1"
> import "crypto/x509/pkix"
>
> func main() {
> store, err := x509.SystemCertPool()
> if err != nil {
> panic(err)
> }
> subjects := store.Subjects()
> for _, rawSubject := range subjects {
> var subject pkix.RDNSequence
> if _, err := asn1.Unmarshal(rawSubject, ); err != nil {
> panic(err)
> }
> fmt.Printf("%+v\n", subject)
> }
> }
>
> The unmarshal code is borrowed from https://stackoverflow.com/a/50640119
>
> Cheers,
> Michael
>
>
Hi,
it works beautifully. Thanks a lot.
--
regards,
Natxo
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[go-nuts] [crypto/x509] SystemCertPool() print subjects of ca certs
hi,
as a learning exercise I would lke to loop through the system's certificate
authorities store, and get the subjects of each certificate authority.
I have this code:
package main
import "fmt"
import "crypto/x509"
func main() {
store, err := x509.SystemCertPool()
if err != nil {
panic(err)
}
fmt.Printf("%T\n", store)
subjects := store.Subjects()
fmt.Printf("%T\n", subjects)
for _, v := range subjects {
fmt.Printf("%T\n", v)
fmt.Println(string(v))
}
}
But I am getting a lot of gibberish.
There should be a better way to do this, but I obviously do not know it.
Thanks for any pointers.
--
regards,
Natxo
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