Toby's Log page 92

Websites in Multiple File Formats

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Since I saw Symfony’s _format routing parameter, which is used to effectively set the file type of the response, I’ve thought it would be cool to have every page on a website support more than just ‘html’ response types by adding a .{_format} to the end of the URL and make a template version for each. Users would be able to consume the same information in different formats depending on their needs. ‘txt’, for example, would basically have just the content that would go in the “ element, in pure text format, providing a fallback or simplified view that can be read even by curl users. ‘json’ or ‘xml’ formats might provide the content and meta data about it in a machine consumable format. You could even go all out with an ‘mp3’ format where you read the page content.

Yesterday, I took my first step toward this idea on my site by implementing my homepage in the ‘txt’ format. This was very simple since my content is already being composed in markdown, a visually pleasing structure for text content.

Obviously, adding more pages and formats will add development time. This probably wouldn’t be useful enough to be worth it for a normal site, but for my own site, I get to play with whatever cool ideas I want.

Symfony AppCache: built in reverse HTTP proxy

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I finally set up my site to work with Symfony’s built in HTTP reverse proxy. Took a little bit of time since I had to fix a couple minor bugs in how things are set up with my symfony-initial and Symfony Standard Edition Bundle and then made a mistake in testing whether or not it was working that made me think it wasn’t when it was.

One useful way to test if it’s working is to set the ‘debug’ option of AppCache to true (turn this back off for production). This will set an X-Symfony-Cache header that will provide info on the cache behaviour. You can see these headers on the shell by running curl -I your.url. If it says ‘fresh’ as part of the header value, that means it was served from the cache. If it shows the header at all, that means AppCache is being used.

For the cache to work, the response must be public and have something set to control how the cache becomes stale. See Symfony’s docs on caching for more details. Since my content rarely changes at the moment, I went with the Cache-Control header with max-age. A cool thing about using Symfony’s reverse proxy is that the entire cache will be cleared when clearing Symfony’s cache like normal. This means that if you make a mistake and must remove it from the cache, there is a quick and easy way.

Toby Now

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My roommate has been out of town this week for work. It’s been me and the dogs. I got to work from home a couple days so I could feed them. Normally when I work from “home”, I actually work from the library, because my roommate doesn’t like me working from home. The dogs have been mostly good, though as usual they can be a bit demanding for attention.

Bought myself a few things earlier this week. Got my first ever electric razor (Phillips-Norelco PQ208). I’ve only used it once, but it seems like it’s going to speed up my shaving experience and make it more likely for me to do. Also, since I usually let my blades get rather dull before buying new ones, it will be less painful. It’s just a travel one, so it cost around as much as a 5 pack of blades for my former razor, the Mach 3.

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House fire down the street

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To continue with my fire theme (see Van fire), I was awoken around 0500 to the sound of some yelling and then some fire trucks. I couldn’t see any fire or smoke from my bedroom window, but could see the trucks and firefighters and neighbors outside. I could hear some talking and at one point chopping and breaking glass. There were so many fire trucks with flashing lights that a red glow came through the curtain, reminding me of a certain Seinfeld episode. They took up like half the block parked along the street. One firetruck parked right in front of our house. They were there for a couple hours probably and kept me awake for at least that long (I often have trouble falling asleep). The event got a brief blurb and video on the channel 5 website.

Van fire

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On my way home from my brothers, I saw a van on fire. Really on fire. The whole thing was enveloped, the van itself looking like a dark skeleton trapped within. The flames would sometimes jump to at least twice the height of the vehicle or flow across the lane width beside it. Firefighters were around it spraying away. The flames would fluctuate out and in, though always completely covering the van. This was on 480 West.

I witnessed another fire related incident recently as well. I saw a large plume of smoke on my way home from work. I was on 77 North and it looked to be a ways away. I had seen smaller plumes before and had wondered what they were, but never investigated. That day though, I had nowhere to be and was in my car, so I decided to find it. I just drove in its general direction until I got close enough to it. It was on the east side of Cleveland. The traffic around it was terrible and it was really slow going in its vicinity. I didn’t get the best view of it, but I did drive down the roads adjacent to it and saw the huge, rolling, multicolored plume of smoke billowing from pretty close and got brief glimpses of the flames and possibly the building. I saw streams spraying into the smoke and flame. The traffic was bad enough that I got my fill looking at it trying to get out of the traffic jam.

And we’re back

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I haven’t posted anything on this site since 2011. My “professional” site and related blog took my attention as I focused on my career. In 2011, this site was hosted from my home on an iBook. That server probably was taken down within a couple years of that post when I moved and didn’t bother trying to get it back up and running. By that point, I had my “professional” site on a shared host (Dreamhost) and liked what it had to offer. I no longer had to worry about keeping my IP updated with DynDNS or the downtime from internet outages (common with my Windstream DSL), server problems, router problems, etc.

This site was down for a period, but at some point I migrated it over to my Dreamhost server. I started it at personal.tobymackenzie.com. After a while, I decided it needed its own domain and would be a good candidate for a .name domain, so I bought tobymackenzie.name. The site was still not fully functional though. Some pages and sections were completely broken, and for a while I couldn’t log into the WordPress install this blog is run with.

Recently, I went through and got most things working and threw a more recent, responsive theme (Twenty Fifteen) onto the blog. A few sections still don’t work. I may have lost the data for the almost never used forums. The gallery is run by software that shared photos from my iPhoto library, no longer possible on shared hosting. I may replace these at some point, though I would probably only put the forum back in a read-only mode for posterity.

Anyway, this site is old and outdated. Some of the information is inaccurate. At some point soon, I intend to replace it with something new, probably something built on Symfony. I hope to merge the code-base and some of the content of my “professional” and personal sites, though in appearance and most content they will remain separate to serve their own purposes most effectively. I will leave this site as is on a sub-domain for posterity. As with most of my personal projects, who knows when I will actually get to it, but I have been itching to play with some things that I don’t get to at work.

As to this blog, I hope to get back into the habit of writing for it. I’ve put a lot of focus on my career lately, but miss thinking and writing about some of my other interests. It can be somewhat therapeutic to write down my ideas or about things happening in my life. Lately, my interest in homes and architecture has been coming back. Hopefully, this blog will be seeing me as regularly as it once did and my thoughts will be archived for my future self and others.

Home Lighting: Sun-light, Moon-light

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Every room has sun-light and moon-light. Hallways, stairwells, walkways, etc. probably just have moon-light. The sun-light would be the bright bulb(s) in the middle of the ceiling or by work areas to allow tasks to be performed. The moon-light is the much dimmer, low wattage option like a night-light, for moving about and other less visually precise activities.

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Load Balancers and HTTPS

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Until recently, I had no experience working with sites behind load balancers. Cogneato has been moving its sites to Rackspace virtual servers for flexibility, among other things. One of their recommendations that we took was to put our web server behind a load balancer. Even though we haven’t needed multiple nodes behind it yet, it makes it easier to upgrade the server behind it without needing to change IPs in DNS and will allow us to easily pop up another node when it is needed.

This arrangement has gone relatively smoothly except a few issues. The biggest ones have had to do with our HTTPS sites. We run both HTTP and HTTPS sites on the same server. We put the certificates on the load balancer, so traffic goes from the load balancer to the web server over HTTP. Both Apache and code see the request as HTTP as standard methods are concerned. I will discuss some of the problems we had and solutions I found.

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Kendo UI

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We recently acquired licenses for Kendo UI at Cogneato. We have plans to use some of its widgets, most notably the data grid and window, heavily in the admin interface for the new CMS we will be building. We figured that the time we save from not having to build similar widgets ourselves would be well worth the hefty license costs.

Troubles

We have made use of the window in a few sites so far, and the grid on alpleaders.org. I have found that for both widgets, it has helped to build a sort of wrapper around them. The wrapper helps normalize configuration and handles some things that we want to happen for all instances. Some of this was related to problems we ran into with the widgets or features we wanted that weren’t built in.

For instance, the data grid has the ability to be filtered per column client side. A ‘row’ mode provides an input with autocomplete for the values in that column. If you want to use a different mode, however, there is no built in autocomplete feature. You have to create an autocomplete widget for each column. Attaching the same data source as the grid uses results in the same number of items in the autocomplete as there are rows in the grid, meaning if 30 items have a ‘State’ of ‘Ohio’, the autocomplete will show ‘Ohio’ 30 times. I set up a helper to build columns and automatically create a new data source with a single instance of each value for the items in a given column. I’m not sure why, since they already built their own logic for the ‘row’ mode, they couldn’t make that an option for other modes.

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