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plugin/file: guard against cname loops (#4387)

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Miek Gieben
2021-01-15 19:26:04 +01:00
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commit 342eae9b4b
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@@ -69,6 +69,15 @@ works, and implement the `ready.Readiness` interface.
See the plugin/pkg/reuseport for `Listen` and `ListenPacket` functions. Using these functions makes
your plugin handle reload events better.
## Context
Every request get a context.Context these are pre-filled with 2 values:
* `Key`: holds a pointer to the current server, this can be useful for logging or metrics. It is
infact used in the *metrics* plugin to tie a request to a specific (internal) server.
* `LoopKey`: holds an integer to detect loops within the current context. The *file* plugin uses
this to detect loops when resolving CNAMEs.
## Documentation
Each plugin should have a README.md explaining what the plugin does and how it is configured. The