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So in this section, I want to talk about routing and I want to use our first external package, so



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if you look at our main DOT file, you'll notice that our routes are all set up here and that's OK.



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But it's really kind of awkward when you start getting a more complex Web application to have all of



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your routes right in your mean folder or your main routine.



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So what I want to do is create a separate file.



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So I'm going to go back to command web and create a new go file, which I will call routes that go all



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right.



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That's still part of our main package.



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And in here, I'm going to have a function and I'm going to call it think routes.



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And it's going to take one argument, which I will call map.



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And it is, of course, our pointer to config up config and it's going to return and HTP Tandler and



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you'll see why before too long, handler.



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All right.



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And inside of that, I'm actually going to create a new HTP handler, which we often call a mux or a



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multiplexed.



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And I'm going to do that using a package.



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I'm not going to use the built in routing functions that are part of the gold standard library.



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I want to use a third party package and we're going to use two, but we're going to start with one and



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then we'll switch to the other.



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We're going to use one that is actually really good at routing.



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It's a very simple one.



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And I'm going to go to my Web browser and show you what it is.



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It's here at GitHub, dotcom BME area and why I have no idea how to pronounce that Pat.



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And it's the router.



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So this is a package that we can import and use in our own code.



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So let's just scroll down and have a look at how do we install it.



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Go get GitHub dot com slash.



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All right, I'll copy that.



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I will go back to my I.D., open the terminal window and I'll clear the screen and I'll just paste that



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command right in there.



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Go get GitHub, dot com, slash that B word, slash pat and it gets it.



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All right.



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Now, what happened when I did that?



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Well, if I go and look at my go mod, you'll see that it now includes this package that was automatically



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put in there for us.



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All right.



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So I've got it installed.



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How do I use the darn thing?



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Well, it's pretty straightforward.



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First thing I'm going to do is create a multiplexed which which is actually at HTP Handler.



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So I will say Mux is assigned the value of Pat Daudt knew.



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All right.



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So I now have a mux and I can just return that.



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And in between where I create it and where I return it is where I actually set up my roots.



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And we only have two routes right now, so let's put them in.



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The first thing you should know is that Mux has some methods built in and you can see them listed here



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in my Idy and you probably have a similar thing in yours.



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And we want a get request.



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And the request takes two arguments, a pattern, which is the string, which is simply the route we're



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matching.



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All right.



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We can do that.



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And then it takes an HTTP handler func.



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Now we need to cast what we get to an active handler function.



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And the function we want is the one that's built into our handlers and that's the home function.



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So we can simply go handlers loops and



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dot repo home and that.



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There you go.



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So that will actually wrote to our home function and we can do the same thing here about should go to



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the about function.



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All right.



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So I've got this this function route's which takes app, which I'm not using, but I might need it at



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some point, so I'm going to pass that.



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How do we actually use this?



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Well, again, that's not too complex.



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All we need to do is make some changes in our main goal.



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We're not going to use these anymore.



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So Akhmatova's OK for right now.



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And instead of this, which is listen and serve, I'm going to comment at that, too, as well.



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So we're going to change it.



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What we need to do is actually create a new variable called serve or whatever you want to call it.



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I'm going to call it Serve S.V. because I am serving and I am going to make that equal to a pointer



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to HDB server and that has some fields.



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All right.



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Those fields are what's our address apart?



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Are we listening to.



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Well, we know what that is.



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That's our part number.



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And we also want to pass it, our handlers.



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And in this case, rather than writing them, as we did up here as individual functions, I'm actually



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going to call our routes and pass at the app.



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Got to Commissaire and Handler is singular, not plural, and this can't be that it needs to be that



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a reference to the app and what do we want to do this?



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That's all we really need to do at this point, is pass those in there.



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We're going to improve this as time goes on.



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But now I need to actually start that bit to start the actual server and we do it as follows.



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Error equals serve, listen and serve.



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And if there's an error, well, log that fatal error.



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So when I run this now, if this compiles, let's see if it does, it is go run, command web, start,



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go.



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And I do need the sternau because now I have two files in my web application.



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Let's hope this runs and it does.



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So let's go back to our web browser and go to localhost eighty eighty and there it is and about and



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there it is.



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Perfect.



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So now we've isolated our application routes so we can get rid of these.



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Commented out outbids.



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And have a look at our full main function and see what it looks like now, that's much cleaner.



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So we're now getting down to the point where we can actually put our roots in one folder.



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So the Pat Schroeder is fine for our purposes today.



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But in the next lecture, I want to swap out Pat for another one called CZI, or possibly she I've never



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actually heard it said out loud, but it's a different river and we're just going to do the swap to



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show you how easy it can be with gold modules to switch it out.



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Plus the key router has some built in middleware that will be using as well.



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So we'll talk about that in the next lecture.