feat: Add support for Fastly Compute@Edge

[JakeChampion]

This adds support for Fastly's Compute@Edge platform and includes a fastly.toml with default values, which anyone can use to deploy to their Fastly account via fastly compute publish. That's the only command they would nede to run ☺️

When working on this, I found pre.sh would not run on OS X, I have modified the script to be compatible with OS X when the script is running on OS X 👍

Please let me know if you have any questions or feedback for this work

[JakeChampion]

I've ran godnsbench however it errors on this application on line - https://github.com/ameshkov/godnsbench/blob/0994faab57033dbd27a9dd0feec18d269db61aeb/main.go#L301

> godnsbench -a https://serverless-dns.edgecompute.app/ -p 10 -c 1 --verbose

83313#1 [info] Run godnsbench with the following configuration:
{
    "Address": "https://serverless-dns.edgecompute.app/",
    "Connections": 10,
    "Query": "example.org",
    "Timeout": 10,
    "Rate": 0,
    "QueriesCount": 1,
    "Verbose": true,
    "LogOutput": ""
}
83313#20 [info] Starting the test and running 10 connections in parallel
83313#24 [debug] github.com/AdguardTeam/dnsproxy/upstream.lookup(): successfully finished lookup for serverless-dns.edgecompute.app in 20.574292ms using . Result : [{151.101.61.51 } {2a04:4e42:4b::307 }]
83313#24 [debug] using HTTP/2 for this upstream: HTTP3 support is not enabled
83313#24 [debug] https://serverless-dns.edgecompute.app:443/: sending request A example.org.
83313#8 [debug] github.com/AdguardTeam/dnsproxy/upstream.(*bootstrapper).createDialContext.func1(): Dialing to 151.101.61.51:443
83313#8 [debug] github.com/AdguardTeam/dnsproxy/upstream.(*bootstrapper).createDialContext.func1(): dialer has successfully initialized connection to 151.101.61.51:443 in 11.326ms
83313#24 [debug] https://serverless-dns.edgecompute.app:443/: response: unpacking response from https://serverless-dns.edgecompute.app:443/: body is : dns: overflow unpacking uint16
83313#24 [debug] error occurred: unpacking response from https://serverless-dns.edgecompute.app:443/: body is : dns: overflow unpacking uint16
83313#20 [info] Finished running all connections
83313#1 [info] The test has finished.
83313#1 [info] The test results are:
83313#1 [info] Elapsed: 88.870709ms
83313#1 [info] Average QPS: 11.251151
83313#1 [info] Processed queries: 0
83313#1 [info] Average per query: 88.898417ms
83313#1 [info] Errors count: 1

[ignoramous]

Thanks.

[ignoramous]

I've ran godnsbench however it errors on this application on line - https://github.com/ameshkov/godnsbench/blob/0994faab57033dbd27a9dd0feec18d269db61aeb/main.go#L301

Unrelated to Fastly. Might be something else that's going wrong. I'll take a look.

Also: Does Fastly support Cache Web APIs?

Btw, readme.md is missing a section on Fastly (:

[JakeChampion]

Also: Does Fastly support Cache Web APIs?

Not yet, when we add support for the Cache Web API I will come back add turn it on for serverless-dns ☺️

Btw, readme.md is missing a section on Fastly (:

Silly me 😅

[ignoramous]

Thanks for these code changes. I'm sure it must not have been an easy task to wade through this soup of a code :) Appreciate it.

Not yet, when we add support for the Cache Web API I will come back add turn it on for serverless-dns ☺️

Looking forward to it.

---

I noticed from one of your tweets that Fastly has a Object Store now, which can be used to host the compressed trie blobs (which contains over 190+ blocklists). serverless-dns also uses Cloudflare LogPush and Workers Analytics. May be Fastly would have those someday too. Exciting times (:

[JakeChampion]

I noticed from one of your tweets that Fastly has a Object Store now, which can be used to host the compressed trie blobs (which contains over 190+ blocklists)

It could definitely store those, where are they currently stored? If stored in Object Store, it would be very fast reads from Fastly Compute@Edge

[ignoramous]

It could definitely store those, where are they currently stored?

They are uploaded to R2 (triggered by a scheduled GitHub Action every 8th day of the month) by:

https://github.com/serverless-dns/blocklists/blob/6753e86fb1a908f4a0ea5d779b5b28e211c83379/src/upload.js#L170-L209

And retrieved from cfstore.rethinkdns.com which is a public read-only endpoint for the underlying R2 bucket:

serverless-dns/src/core/env.js

Lines 97 to 100 in 5d93c57

	CF_BLOCKLIST_URL: {
	type: "string",
	default: "https://cfstore.rethinkdns.com/blocklists/",
	},

In the recent versions, we also downloadn a Geo IP database from R2:

serverless-dns/src/core/env.js

Lines 139 to 142 in 5d93c57

	GEOIP_URL: {
	type: "string",
	default: "https://cfstore.rethinkdns.com/geoip/2022/1667349639157/",
	},