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* - add support of metadata values for edns0 local variables * - comments from review. * - simplify label check. Add UT * - enhance check for Labels, add UT - remove IsMetadataSet * - edns0 variable - if variable is not found just ignore the rewrite.
metadata
Name
metadata - enable a meta data collector.
Description
By enabling metadata any plugin that implements metadata.Provider interface will be called for each DNS query, at beginning of the process for that query, in order to add it's own Metadata to context.
The metadata collected will be available for all plugins, via the Context parameter provided in the ServeDNS function. The package (code) documentation has examples on how to inspect and retrieve metadata a plugin might be interested in.
TODO: write about naming of the keys (labels). TODO: write about extracting and using
Syntax
metadata [ZONES... ]
- ZONES zones metadata should be invoked for.
Plugins
metadata.Provider interface needs to be implemented by each plugin willing to provide metadata information for other plugins. It will be called by metadata and gather the information from all plugins in context.
Note: this method should work quickly, because it is called for every request.
Examples
There are currently no in tree plugins that write or use metadata.
Also See
The Provider interface and the package level documentation.