gcoap_forward_proxy: provide cache validation mechanism #17801
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Rebased and retested on diff --git a/aiocoap/cli/fileserver.py b/aiocoap/cli/fileserver.py
index 1bf2ba4..f6ce129 100644
--- a/aiocoap/cli/fileserver.py
+++ b/aiocoap/cli/fileserver.py
@@ -160,2 +160,3 @@ class FileServer(Resource, aiocoap.interfaces.ObservableResource):
+ response.opt.max_age = 10
response.opt.etag = etag) $ sudo ./dist/tool/tapsetup/tapsetup
$ PORT=tap1 USEMODULE="gcoap_forward_proxy nanocoap_cache" make -C examples/gcoap -j flash term
...
[second terminal in aiocoap repo]
$ ./aiocoap-fileserver --bind "[$(ip addr show dev tapbr0 scope link | grep -o 'inet6 [0-9a-f:]\+' | sed 's/inet6 //')%tapbr0]" test/
...
[third terminal]
$ make -C examples/gcoap term
All up, running the shell now
> coap proxy set fe80::e0bc:7dff:fecb:f550 5683
coap proxy set fe80::e0bc:7dff:fecb:f550 5683
>
> coap get fe80::dc1a:a8ff:fe09:45b3 5683 /a.txt
coap get fe80::dc1a:a8ff:fe09:45b3 5683 /a.txt
gcoap_cli: sending msg ID 51017, 54 bytes
> --- blockwise start ---
gcoap: response Success, code 2.05, 7 bytes
foobar
--- blockwise complete ---
coap get fe80::dc1a:a8ff:fe09:45b3 5683 /a.txt
coap get fe80::dc1a:a8ff:fe09:45b3 5683 /a.txt
gcoap_cli: sending msg ID 51018, 54 bytes
> --- blockwise start ---
gcoap: response Success, code 2.05, 7 bytes
foobar
--- blockwise complete ---
^C
native: exiting |
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Addressed doxygen errors and squashed. |
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Squashed as requested off-line |
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I tested more extensively today and found a strange error path: |
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Mh... that indicates, that the proxy is not able to allocate another cep. Will have a look. |
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fb9a11d fixes that. On validation, the client ep was previously not freed correctly 😅. Good catch! |
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Alright, I can't reproduce this error anymore with your fix. Looks good! Please squash. |
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This was referenced Oct 18, 2023
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Contribution description
This provides support for the cache validation mechanism of CoAP for the
gcoap_forward_proxymodule ifnanocoap_cacheis also provided.Testing procedure
TBD procedurally, but could be easily done with an
aiocoapserver with ETag support, a RIOT client and a RIOT forward proxy inbetween the two. The client requests a resource via the proxy (the server delivers the data with an ETag), waits until the Max-Age (default 60 seconds) of the resource passed, then requests the (assumed to be unchanging) resource again. This should trigger the proxy to send a request with the resource's ETag to the server which in turn answers with a 2.03 Valid response. The proxy should then send the original cached response back (and update the cache entries Max-Age).Issues/PRs references
Requires #13889 and its dependencies.