Fetching Logged in User Info for display - go

Question

I am using https://github.com/kataras/iris Go web framework. I have:
User Registered
User Verified & Logged in
Session created and set with key username with user (table & struct) username
Now, here is my code for logged in user:
// Loaded All DB and other required value above
allRoutes := app.Party("/", logThisMiddleware, authCheck) {
allRoutes.Get("/", func(ctx context.Context) {
ctx.View("index.html");
});
}
In authcheck middleware
func authcheck(ctx context.Context) {
// Loaded session.
// Fetched Session key "isLoggedIn"
// If isLoggedIn == "no" or "" (empty)
// Redirected to login page
// else
ctx.Next()
}
My Session function
func connectSess() *sessions.Sessions {
// Creating Gorilla SecureCookie Session
// returning session
}
Now, my problem is, how do I share Logged User value to all routes in template. My Current option is:
// Loaded all DB and required value
allRoutes := app.Party("/", logThisMiddleware, authCheck) {
allRoutes.Get("/", func(ctx context.Context) {
// Load Session again
// Fetch username stored in session
// Run Query against DB
// Share the user struct value.
// Example ctx.ViewData("user", user)
ctx.View("index.html");
});
allRoutes.Get("dashboard", func(ctx context.Context) {
// Load Session again
// Fetch username stored in session
// Run Query against DB
// Share the user struct value.
// Example ctx.ViewData("user", user)
ctx.View("index.html");
});
}
But problem with above code is, I will have to write session for each route and run query again for each route I run and than share.
I feel, there must be better way of doing it , rather than loading session twice for each route one in authCheck middleware and second inside allRoutes.Get route.
I need ideas on how this can be optimised and user data can be shared to template by just writing code one time and not repeating below for each route
// Load Session again
// Fetch username stored in session
// Run Query against DB
// Share the user struct value.
// Example ctx.ViewData("user", user)

Answer 1

it's easy you can use the ctx.Values().Set/Get to make something shareable between your route's handlers or middleware(s).
// load session manager once
sess := connectSess()
func authCheck(ctx context.Context) {
session := sess.Start(ctx)
// Load your user here.
// [...]
// Save the returning user to the local storage of this handlers chain, once.
ctx.Values().Set("user", user) // <-- IMPORTANT
}
app.Get("/", func(ctx context.Context) {
// Get the user from our handlers chain's local storage.
user := ctx.Values().Get("user") // <-- IMPORTANT
// Bind the "{{.user}}" to the user instance.
ctx.ViewData("user", user)
// Render the template file.
ctx.View("index.html")
})
app.Get("dashboard", func(ctx context.Context) {
// The same, get the user from the local storage...
user := ctx.Values().Get("user") // <-- IMPORTANT
ctx.ViewData("user", user)
ctx.View("index.html")
})
That's all, pretty simple, right?
But I have some notes for you, read them if you have more time.
When you're on root "/" you don't have to create a party for it(.Party) in order to add middlewares (begin(Use) or finish(Done)), use just the iris.Application instance, app.Use/Done.
Don't write this:
allRoutes := app.Party("/", logThisMiddleware, authCheck) {
allRoutes.Get("/", myHandler)
}
Do that instead:
app.Use(logThisMiddleware, authCheck)
app.Get("/", myHandler)
It's easier to read and understand.
I've also noticed that you're using ; at the end of your functions, your editor and gocode tool will remove those, when you write a program using the Go Programming Language you shouldn't do that, remove all ;.
Last, please read the documentation and the examples, we have many of them at https://github.com/kataras/iris/tree/master/_examples , hopes you the best!