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SDK extensibility: add hooks (plugins, discovery, sdk) #6053

Merged
merged 3 commits into from
Jun 29, 2023
Merged

SDK extensibility: add hooks (plugins, discovery, sdk) #6053

merged 3 commits into from
Jun 29, 2023

Commits on Jun 29, 2023

  1. extensibility: add hooks (plugins, discovery, sdk) 

    This adds a lightweight extensibility mechanism to OPA: hooks. Loosely
modelled on what franz-go supports (see refs below).

We're starting with a configuration hook. It allows us to inspect or
alter the configuration of OPA after...

1. the config is read and parsed: OnConfig
2. a discovery bundle is processed: OnConfigDiscovery

References:
- franz-go: https://pkg.go.dev/github.com/twmb/franz-go/pkg/kgo#Hook

To follow:
- more hooks where they are useful
- runtime support for hooks, wiring them into the proper other places

Signed-off-by: Stephan Renatus <stephan@styra.com>
    @srenatus
    srenatus committed Jun 29, 2023
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  2. build: add errors.Join workaround for go <1.20 

    Signed-off-by: Stephan Renatus <stephan@styra.com>
    @srenatus
    srenatus committed Jun 29, 2023
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  3. config: fix 'Extra' oversight wrt 'nil' vs empty map 

    Signed-off-by: Stephan Renatus <stephan@styra.com>
    @srenatus
    srenatus committed Jun 29, 2023
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