On Sat, Aug 7, 2021 at 9:21 AM Hamidreza Hosseini
<[email protected]> wrote:
>
> Hi,
> I read the sample config that you sent but Can I use "bereq.url" in this way:
> for example I want to shard my requests for live streams based on the url's
> that clients enter, for example if the following url's are different live
> streams (stream1 and stream2 are the name of different streams ):
> ```
> mydomain.com/live/australia/stream1/chunk_43212123.ts
> mydomain.com/live/australia/stream2/chunk_43212123.ts
> mydomain.com/live/australia/stream3/chunk_43212123.ts
> ```
> Now think I want just the url excluded with chunk file becomes hashed and
> sharded:
> Just this part: "/live/australia/stream{1,2,3}/"
> Not :"/live/australia/stream{1,2,3}/chunk_43212123.ts"
>
> So by adjusting " p.set(by=KEY, key=bereq.url) " it would shard "bereq.url",
> it means "/live/australia/stream{1,2,3}/chunk_43212123.ts"
If you want to do that, you need to extract the relevant part and
compute a key from it:
> set bereq.http.my-key = bereq.http.host + regsub(bereq.url, "/chunk_.*", "");
> set bereq.backend = dir.backend(by=KEY, key=dir.key(bereq.http.my-key));
Below is a test case where both requests go through the same
backend:
---
varnishtest "shard by subset of url"
server s1 {
loop 2 {
rxreq
txresp
}
} -start
server s2 {
loop 2 {
rxreq
txresp
}
} -start
varnish v1 -vcl+backend {
import directors;
sub vcl_init {
new dir = directors.shard();
dir.add_backend(s1);
dir.add_backend(s2);
}
sub vcl_backend_fetch {
set bereq.http.shard-key = bereq.http.host +
regsub(bereq.url, "/chunk_.*", "");
set bereq.backend = dir.backend(by=KEY,
key=dir.key(bereq.http.shard-key));
}
sub vcl_backend_response {
set beresp.http.backend = beresp.backend;
}
} -start
client c1 {
txreq -url "/live/australia/stream1/chunk_123.ts"
rxresp
expect resp.http.backend == s1
txreq -url "/live/australia/stream1/chunk_456.ts"
rxresp
expect resp.http.backend == s1
} -run
---
Dridi
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