image caching problem with Chrome

[Chris Richmond]

All, this can't be a new thing, but using Chrome and weewx 3.9.1, the graphs don't reload when refreshing the

web page.  Rather than having to clear the image cache in Chrome's Settings, is it reasonable to add a trick like this:

<a href="myshake/gifs/RD066_EHZ_AM_00.2019090100.gif?v=1567339258">

This is from a different web published RPi dodad raspberryshake (mine is broken at the moment).  Anyhow, the trick

is to add a timestamp to the href that updates with the image so that it tricks the caching mechanism into reloading the

same named file when the timestamp has changed.  Does cheetah support that sort of thing?

Semi-unrelated, but is there a way to get the rsync report to run after the the images are generated rather than

before?  As it is, the images are always a cycle behind the rest of the page updates.  The report module isn't sorting

the names, but maybe naming rsync ZRSYNC and sorting the report names would work???

Sep 22 16:20:38 pivue weewx[30301]: copygenerator: copied 0 files to /home/weewx/public_html.vp2

Sep 22 16:25:14 pivue weewx[30301]: manager: Added record 2019-09-22 16:25:00 MDT (1569191100) to database 'weewx.sdb'

Sep 22 16:25:15 pivue weewx[30301]: manager: Added record 2019-09-22 16:25:00 MDT (1569191100) to daily summary in 'weewx.sdb'

Sep 22 16:25:16 pivue weewx[30301]: rsyncupload: rsync'd 23 files (168,268 bytes) in 0.96 seconds

Sep 22 16:25:32 pivue weewx[30301]: cheetahgenerator: Generated 9 files for report SeasonsReport in 14.57 seconds

Sep 22 16:25:38 pivue weewx[30301]: imagegenerator: Generated 14 images for SeasonsReport in 6.61 seconds

Sep 22 16:25:38 pivue weewx[30301]: copygenerator: copied 0 files to /home/weewx/public_html.vp2

Site is here: http://www.csrhome.online/vp2weather/index.html

thx,Chris 

[Thomas Keffer]

Take a look at this thread. It offers several solutions.

-tk

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[Chris Richmond]

Thanks.  I don't think I have access to the web server config to go at it from that angle, but since I'm post-processing

all the web pages anyway to change host names, I can add the actual timestamps from the files while I'm at it.

Any other ideas on the report sequence?  I can fiddle with that when I get home.

Thx, Chris

On Sunday, September 22, 2019 at 5:05:53 PM UTC-7, Thomas Keffer wrote:

Take a look at this thread. It offers several solutions.

-tk

Semi-unrelated, but is there a way to get the rsync report to run after the the images are generated rather than

before?  As it is, the images are always a cycle behind the rest of the page updates.  The report module isn't sorting

the names, but maybe naming rsync ZRSYNC and sorting the report names would work???

Sep 22 16:20:38 pivue weewx[30301]: copygenerator: copied 0 files to /home/weewx/public_html.vp2

Sep 22 16:25:14 pivue weewx[30301]: manager: Added record 2019-09-22 16:25:00 MDT (1569191100) to database 'weewx.sdb'

Sep 22 16:25:15 pivue weewx[30301]: manager: Added record 2019-09-22 16:25:00 MDT (1569191100) to daily summary in 'weewx.sdb'

Sep 22 16:25:16 pivue weewx[30301]: rsyncupload: rsync'd 23 files (168,268 bytes) in 0.96 seconds

Sep 22 16:25:32 pivue weewx[30301]: cheetahgenerator: Generated 9 files for report SeasonsReport in 14.57 seconds

Sep 22 16:25:38 pivue weewx[30301]: imagegenerator: Generated 14 images for SeasonsReport in 6.61 seconds

Sep 22 16:25:38 pivue weewx[30301]: copygenerator: copied 0 files to /home/weewx/public_html.vp2

Site is here: http://www.csrhome.online/vp2weather/index.html

thx,Chris 

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[gjr80]

Hi,

Reports are processed in the order listed in weewx.conf under [StdReport], have a look under [StdReport], is [[RSYNC]] before or after [[SeasonsReport]]? Based on the log extract provided I am guessing it is before. If so try moving then entire [[RSYNC]] stanza to be after (the entire) [[SeasonsReport]] stanza. If [[RSYNC]] is indeed after [[SeasonsReport]] then post a copy of your [StdReport] stanza (if you do make sure any passwords, user names or other sensitive info is obfuscated). Note you will need to restart WeeWX or do a config reload for any weewx.conf changes to take effect.

As an aside a similar ordered approach is taken within each skin. In the skin config file, skin.conf, the generators are run in the order they are listed; normally the Cheetah generator first to produce template based reports then the Image generator to produce plots. Within each of these generators the reports and plots are produced in the order listed.

Gary

[Chris Richmond]

Thanks, it was the first enabled report in the list.  I've moved it to the end now.  The config setup is mostly the default for 3.9.1

for a Vantage station.

Chris

[Pat]

> This is from a different web published RPi dodad raspberryshake (mine is broken at the moment).  Anyhow, the trick is to add a timestamp to the href that updates with the image so that it tricks the caching mechanism into reloading the same named file when the timestamp has changed.  Does cheetah support that sort of thing?

Yes, Cheetah supports it. I use this trick in my Belchertown skin to prevent caching. Here's how you can use it too. 

This is NOT TESTED on Seasons, so be sure to have a backup. Find the images you want to stop caching for. For example inside the index.html.tmpl. Add this to the end of the image src: ?v=#echo int( time.time() ) #

For example in a full line:

<img src="daybarometer.png?v=#echo int( time.time() ) #" alt="$obs.label.barometer"/>

That'll change the img src to have a timestamp at the end, similar to your a href you have mentioned. The timestamp will not be when you refresh the page, but rather the time when weewx generated the index.html page. So it should update every archive interval with a new timestamp appended.