Artem Boldariev 9846f395ad DoH: process data chunk by chunk instead of all at once ... Initially, our DNS-over-HTTP(S) implementation would try to process as much incoming data from the network as possible. However, that might be undesirable as we might create too many streams (each effectively backed by a ns_client_t object). That is too forgiving as it might overwhelm the server and trash its memory allocator, causing high CPU and memory usage. Instead of doing that, we resort to processing incoming data using a chunk-by-chunk processing strategy. That is, we split data into small chunks (currently 256 bytes) and process each of them asynchronously. However, we can process more than one chunk at once (up to 4 currently), given that the number of HTTP/2 streams has not increased while processing a chunk. That alone is not enough, though. In addition to the above, we should limit the number of active streams: these streams for which we have received a request and started processing it (the ones for which a read callback was called), as it is perfectly fine to have more opened streams than active ones. In the case we have reached or surpassed the limit of active streams, we stop reading AND processing the data from the remote peer. The number of active streams is effectively decreased only when responses associated with the active streams are sent to the remote peer. Overall, this strategy is very similar to the one used for other stream-based DNS transports like TCP and TLS.		2025-01-15 14:09:17 +00:00
..
dns	Limit the additional processing for large RDATA sets	2025-01-14 09:57:54 +00:00
isc	DoH: process data chunk by chunk instead of all at once	2025-01-15 14:09:17 +00:00
isccc	Remove C++ support from the public header	2024-12-18 13:10:39 +01:00
isccfg	Remove C++ support from the public header	2024-12-18 13:10:39 +01:00
ns	Limit the additional processing for large RDATA sets	2025-01-14 09:57:54 +00:00
.gitignore	The isc/platform.h header has been completely removed	2021-07-06 05:33:48 +00:00
Makefile.am	Move irs_resconf into libdns and remove libirs	2023-02-24 09:38:59 +00:00