You can place the dependencies into a struct and use a bound method on that
as your handler. So you build a struct that will hold application-scoped
objects like Redis client, content.Updater, etc.
package contact
type Handler struct {
Redis *redis.Client
Updater *content.Updater
Mapper *mapping.Updater
}
func (h *Handler) Endpoint1(w http.ResponseWriter, r *http.Request) {
// ...
}
Then build the Handler when you’re setting up the router (presumably in
main() or nearby) and register it against the router as usual.
handler := contact.Handler{
Redis: config.GetRedisDb(),
Updater: contents.GetUpdater(),
Mapper: mapping.GetUpdater(),
}
myRouter.Handle("/endpoint1/",
http.HandlerFunc(h.Endpoint1)).Methods("POST", "OPTIONS")
// or
myRouter.HandleFunc("/endpoint1/", h.Endpoint1).Methods("POST", "OPTIONS")
On Mon, Sep 23, 2019 at 2:37 AM Nathanael Curin <n.cu...@capitaldata.fr>
wrote:
> I'm avoiding context.WithValue since I feel the objects I'm dealing with
> are too "powerful" (i.e. not simple Values). For a read, a 2016 article on
> this : https://peter.bourgon.org/blog/2016/07/11/context.html
>
> <https://urldefense.proofpoint.com/v2/url?u=https-3A__peter.bourgon.org_blog_2016_07_11_context.html&d=DwMFaQ&c=r2dcLCtU9q6n0vrtnDw9vg&r=1l8pq-0AmiqF9VqB_zc2sA&m=NI61KpC9jRpLlUlKWVRDZmipntercznF0NBSCnIuTxo&s=pE-cXfAKqzEre0LV5lcGQmX_oGtu8kIyJyU7M14ZwWs&e=>
> I remember reading through another article saying the usage of WithValue
> is kind of risky when time goes on, since it's just a magical interface{}
> store. Performance-wise I'm not sure though.
>
> Though, you're right, that'd be another way to do it. Waiting for people
> to chime in with their ideas too (hopefully!) :)
>
>
> Le lundi 23 septembre 2019 11:20:52 UTC+2, Andrew Pillar a écrit :
>>
>> Why don't you use context.WithValue(r.Context(), <key>, <value>) for
>> passing
>> the injected values you want to your HTTP handlers. Then defer the logic
>> for
>> retrieving whatever you want for that handler to a middleware function.
>>
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