delta: [#558] Support dynamic wildcard subscription in delta-xds #559
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Unittests are not provided yet, will add soon |
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Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>
…ard mode Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>
Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>
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This build error seems to be related to an envoy upstream update in the repo 14 days ago |
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@valerian-roche any updates on upstream still failing around this? |
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I think I need to rebase, will do |
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@alecholmez Build is fixed after merging main |
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A first draft for sotw is available at valerian-roche#4 but won't be raised here until this one has reached a conclusion as it's building on it |
pkg/server/stream/v3/stream.go
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| @@ -23,20 +23,44 @@ type DeltaStream interface { | |||
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| // StreamState will keep track of resource state per type on a stream. | |||
| type StreamState struct { // nolint:golint,revive | |||
| // Indicates whether the original DeltaRequest was a wildcard LDS/RDS request. | |||
| // Indicates whether the stream currently has a wildcard watch | |||
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Let's make this comment explicit to delta since SOTW also uses this StreamState internally.
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Done. I have a follow-up PR to add it for sotw, will re-update then
pkg/server/delta/v3/server.go
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| continue | ||
| } | ||
| if _, ok := sv[resource]; ok && streamState.IsWildcard() { | ||
| // xds protocol specifically states that if a resource if unsubscribed while a wildcard watch is present, |
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Can we clean this comment block up?
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I tried to make it clearer, though it is still so counter-intuitive to me I have a hard time formalizing it
Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>
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… top of #559 (#657) * Set safe directory in CI script to fix build issue related to VCS stamping in binaries Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com> * Revert "Fix for the SDS update failure (#615)" This reverts commit 0e0f25d. Signed-off-by: Valerian Roche <valerian.roche@datadoghq.com>
Envoy 1.21.0 introduced a new definition for wildcard watches in the xds protocol
I provided more details in #558, but it impacts both the semantics and the behavior
This PR is implementing this flow for delta-xds (I will follow-up with a sotw later on)
It is for now ignoring a potential grey area of the protocol (which was somewhat applicable before): if a stream is opened in legacy wildcard mode (no resource provided) then is subscribing to a resource which is not wildcard, it will remain wildcard. I don't think this should be impactful as it would mean envoy using both legacy and new model in the same stream, but worth noting