one way is to fetch `https://1.1.1.1/cdn-cgi/trace` from inside the DO, and cache the colo field fro

one way is to fetch

https://1.1.1.1/cdn-cgi/trace

https://1.1.1.1/cdn-cgi/trace

from inside the DO, and cache the colo field from that trace

John SpurlockOP•8/5/21, 4:35 PM

iirc module workers are now passed a

cf

cf

property on each incoming fetch request, so

request.cf.colo

request.cf.colo

is defined for the incoming worker request, but the

Request

Request

passed to your DO's

fetch

fetch

still does not have the

cf

cf

property (I just double-checked) - it makes sense since many of the custom

cf

cf

properties don't apply for the internal DO fetch calls, but a colo accessor (maybe on

state

state

?) would certainly be useful

ItsWendell•8/5/21, 4:49 PM

Yeah having the CF property specific for the worker would be great!

John SpurlockOP•8/5/21, 4:57 PM

in case you haven't seen it, check out https://where.durableobjects.live/ by @jedschmidt, a cool idea to find out which cf colos support DOs at the moment

JJohn Spurlock in case you haven't seen it, check out https://where.durableobjects.live/ by @je...

asp•8/5/21, 5:43 PM

asp•8/5/21, 5:44 PM

/cdn-cgi/trace > colo=OTP

/cdn-cgi/trace > colo=OTP

John SpurlockOP•8/5/21, 5:45 PM

hehe, probably a colo he doesn

John SpurlockOP•8/5/21, 5:45 PM

t have his master list yet

asp•8/5/21, 5:46 PM

It's on VPN to Albania - thought I'd populate the list some more

John SpurlockOP•8/5/21, 5:47 PM

it would be so nice to be able to send a worker request to a specific colo for testing this sort of thing

asp•8/5/21, 5:47 PM

when you loaded this page from undefined, a worker in Bucharest (OTP) created a durable object in Vienna (VIE)

when you loaded this page from undefined, a worker in Bucharest (OTP) created a durable object in Vienna (VIE)

asp•8/5/21, 5:47 PM

correct colo this time

asp•8/5/21, 5:47 PM

wait,

colo=PRG

colo=PRG

John SpurlockOP•8/5/21, 5:47 PM

maybe pager went off : )

asp•8/5/21, 5:48 PM

seems to change a lot from this location

asp•8/5/21, 5:48 PM

asp•8/5/21, 5:50 PM

it was 44% when I started

John SpurlockOP•8/5/21, 5:52 PM

denominator+++++++

asp•8/5/21, 6:25 PM

Alright, I "managed" to bring the percentage down to 37. Won't spend anymore time on this

JJohn Spurlock t have his master list yet

jed•8/5/21, 11:47 PM

yeah, using this list: https://speed.cloudflare.com/locations

jed•8/5/21, 11:47 PM

(tho should’ve handled that more gracefully)

Jjed yeah, using this list: https://speed.cloudflare.com/locations

Hello, I’m Allie!•8/5/21, 11:53 PM

How'd I not noticed that? I needed the locations of the datacenters for a project, so I scraped them off the statuspage then geocoded them.

HHello, I’m Allie!How'd I not noticed that? I needed the locations of the datacenters for a projec...

codefrau•8/5/21, 11:55 PM

Me too

codefrau•8/5/21, 11:56 PM

Guess I should update my latency map durable-objects

jed•8/6/21, 12:12 AM

i did the same until i found that endpoint!

jed•8/6/21, 12:12 AM

good thing workers makes scraping so easy…

Ccodefrau Guess I should update my latency map https://discord.com/channels/59531799019139...

codefrau•8/6/21, 12:39 AM

Actually no - the coords in that list are literally the airport coords which makes the map look rather weird zoomed in. I'll keep my reverse geocoder.

Ccodefrau Actually no - the coords in that list are literally the airport coords which mak...

Hello, I’m Allie!•8/6/21, 12:40 AM

Does your Latency Map test latency to your datacenters, or the actual Colos?

HHello, I’m Allie!Does your Latency Map test latency to your datacenters, or the actual Colos?

codefrau•8/6/21, 12:53 AM

it's measuring roundtrip latency client – worker – DO – worker – client using a websocket connection (as we do for our "real" apps)

Ccodefrau it's measuring roundtrip latency client – worker – DO – worker – client using a ...

Hello, I’m Allie!•8/6/21, 12:54 AM

And how do you figure out which colo the DO is in?

HHello, I’m Allie!And how do you figure out which colo the DO is in?

codefrau•8/6/21, 12:54 AM

https://1.1.1.1/cdn-cgi/trace

Ccodefrau https://1.1.1.1/cdn-cgi/trace

Hello, I’m Allie!•8/6/21, 12:54 AM

Should have foreseen that.

HHello, I’m Allie!Should have foreseen that.

codefrau•8/6/21, 12:55 AM

codefrau•8/6/21, 1:50 AM

Hmm, curious. One of my DOs moved from LAX to SJC today

Is that supposed to happen?

Ccodefrau Hmm, curious. One of my DOs moved from LAX to SJC today 🤔 Is that supposed to h...

Hello, I’m Allie!•8/6/21, 1:51 AM

Might have been me...

Hello, I’m Allie!•8/6/21, 1:53 AM

Sorry about that, @codefrau!

codefrau•8/6/21, 1:53 AM

Huh? How? Supposedly DOs are fixed to one colo, unless that colo is down, I thought

Ccodefrau Huh? How? Supposedly DOs are fixed to one colo, unless that colo is down, I thou...

Hello, I’m Allie!•8/6/21, 1:54 AM

I believe that DOs persist in one colo, until they are shut down. Once they are triggered again, they are reinitialized in the nearest DO-ready colo to the incoming request.

HHello, I’m Allie!I believe that DOs persist in one colo, until they are shut down. Once they are ...

codefrau•8/6/21, 1:56 AM

The way @kentonv_cf described it is that it lives in one colo, but is replicated to a few near colos for backup. It would not "jump" from the EU to the US.

Ccodefrau The way @kentonv_cf described it is that it lives in one colo, but is replicated...

Hello, I’m Allie!•8/6/21, 1:58 AM

According to your log above, it seems that because there was an extended period of time with no requests, it was terminated(FRA). Once someone else triggered it(Me, probably), it was reestablished in the nearest Colo(SJC) to my request.

Hello, I’m Allie!•8/6/21, 2:00 AM

At least I believe so, I'm having a hard time figuring out that log.

codefrau•8/6/21, 2:00 AM

LAX being down for a while would make sense, but I'd have assumed it would move back to LAX once its up again.

Hello, I’m Allie!•8/6/21, 2:01 AM

Not if the next request comes from somewhere else, before it can reestablish itself there.

codefrau•8/6/21, 2:01 AM

there were like 13 hours in between

Ccodefrau there were like 13 hours in between

Hello, I’m Allie!•8/6/21, 2:02 AM

The change?

HHello, I’m Allie!The change?

codefrau•8/6/21, 2:02 AM

to "jump back" from SJC to LAX

codefrau•8/6/21, 2:02 AM

... but maybe SJC is now the "authoritative copy"

Ccodefrau to "jump back" from SJC to LAX

Hello, I’m Allie!•8/6/21, 2:03 AM

How many times was it triggered in those 13 hours?

codefrau•8/6/21, 2:03 AM

Never. This is the complete log.

codefrau•8/6/21, 2:04 AM

I left out some detail but the last connection in SJC closed at 2021-08-05 03:22:52.283 PDT

Hello, I’m Allie!•8/6/21, 2:04 AM

So, somewhere within those 13 hours, the SJC Instance was terminated. Then, after 13 hours had passed, someone sent a request, initializing a new instance at LAX