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We are all done with the first goal of our API, so we are correctly serving up Riak project files.

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Now going to move on to steps two and three, which are essentially to retrieve a list of cells out

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of a stored file and add a list of cells into an existing file as well.

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These are going to be pretty easy and straightforward routes to put together.

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Really just going to receive some requests, pull some information out of the request, and then save

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some data into a file using the first module, which is a node standard library module.

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So let's get to it back inside my editor.

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I'm going to find my local API project inside.

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There, I'll find the Sarsae directory and I'll make a new folder inside there called Route's.

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Then inside of roots, I'll make a new file called Cels Dots.

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Inside of here, I'm going to first express.

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From Xpress.

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I'll then create an express router.

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If you're not familiar with the router, it is extremely similar to the app object that we're currently

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working with inside of our index not file.

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So that express app right there.

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So a router has methods assigned to it, like get post, delete does used to wire middleware and so

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on.

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So we're going to add a couple of routes onto this router object and then merge this router back into

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our app over inside of our indexed dots file.

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So we will first set up one or two different routes.

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Let's do a router dot get cells, we'll have that B async await.

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And then a function to run and we'll do a router post two cells that will also be an async function.

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OK, looks good.

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Let's receive our request in response objects on both them.

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And then inside of both these, let's just write a couple of comments out just to guide ourselves and

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make sure that we can kind of consider a couple of different scenarios to first off, in the case of

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getting a list of cells.

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The first thing we probably need to do inside of here is make sure that the file that is going to store

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a list of cells actually exists.

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So we're going to make sure the cell storage file exists.

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Remember, whenever a user starts up our supply, they're going to optionally provide us the name of

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the file that they want to use for storing cells if that file doesn't exist.

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We should probably create it for our users.

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So step one right here is to just make sure that file exists.

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If it does not, we'll create it for our users and maybe put in some default content into it as well.

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Let's put in a comment for that as well.

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So I'll put in if the file or if it does not exist, add in a default list of cells.

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And after that, once we are 100 percent sure that this file exists, we will read the file.

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Here's a list of cells out of it.

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And then finally send list of cells back to Browsr.

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That's pretty much it should be pretty straightforward.

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Our post method down here will be pretty straightforward as well.

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So in this case.

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We probably want to just make sure once again that this file exists.

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It is entirely possible that a user might delete the file in between save attempts or maybe rename it

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or something like that, so we might want to make sure that the file exists.

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And if it does not.

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We will create it.

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After that, we're going to take the list of cells from the request object because remember, our assumption

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here is that a user is going to be saving or sending us a list of cells that they want to persist.

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We're going to take the list of cells from the request object and we're going to serialize them or in

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other words, turn them into a format that can be safely written into that file, will then write the

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cells.

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Into the file.

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And that's pretty much it.

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So both these handlers are going to be pretty straightforward in nature, and the one thing I want to

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mention here that's just a little bit not standard.

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Remember, back inside of our inducts file, our search function has been given the file name and the

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directory that file citzen.

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So we really need to somehow communicate these two variables over to this cels router.

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So to do so, we're going to wrap up all this router creation stuff and all the router configuration

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in a function.

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And we're going to make sure that that function will eventually be coupled with the filename and directory

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that should be used for all this file related stuff.

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So right above construed right here, we're going to add in and export to create sales Rohter.

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I'll then place the closing curly brace on the very bottom line of the file.

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So all this stuff is going to go into the body of that function.

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Well, then make sure that we provide the file name as a string and the directory name as a string.

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So then finally, let's go back over to our next thoughts while we're going to import cells, Rueter,

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we're going to create the router and when we do, we'll make sure we pass in our filename and directory

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will then make sure we return the router at the bottom of this function.

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Let's do that very quickly.

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So down here, I'm going to return the router and we'll make sure we wire that up to our express app.

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Let's go back over to index at the very top, we will import create cells, rueter from route's cells.

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And then right above our existing return statement will do an app not use, that's how we wire up an

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express router, create sells router, we're going to call that function and we'll make sure we provide

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the filename and the directory and remember file name and directory arguments to our search function.

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They are right there.

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OK, so it looks good now all you have to do is a pretty good amount of work around these two different

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handlers and we should be all set.