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d973445a94
" Adds extension points to schema/sstables to enable hooking in stuff, like, say, something that modifies how sstable disk io works. (Cough, cough, *encryption*) Extensions are processed as property keywords in CQL. To add an extension, a "module" must register it into the extensions object on boot time. To avoid globals (and yet don't), extensions are reachable from config (and thus from db). Table/view tables already contain an extension element, so we utilize this to persist config. schema_tables tables/views from mutations now require a "context" object (currently only extensions, but abstracted for easier further changes. Because of how schemas currently operate, there is a super lame workaround to allow "schema_registry" access to config and by extension extensions. DB, upon instansiation, calls a thread local global "init" in schema_registry and registers the config. It, in turn, can then call table_from_mutations as required. Includes the (modified) patch to encapsulate compression into objects, mainly because it is nice to encapsulate, and isolate a little. " * 'calle/extensions-v5' of github.com:scylladb/seastar-dev: extensions: Small unit test sstables: Process extensions on file open sstables::types: Add optional extensions attribute to scylla metadata sstables::disk_types: Add hash and comparator(sstring) to disk_string schema_tables: Load/save extensions table cql: Add schema extensions processing to properties schema_tables: Require context object in schema load path schema_tables: Add opaque context object config_file_impl: Remove ostream operators main/init: Formalize configurables + add extensions to init call db::config: Add extensions as a config sub-object db::extensions: Configuration object to store various extensions cql3::statements::property_definitions: Use std::variant instead of any sstables: Add extension type for wrapping file io schema: Add opaque type to represent extensions sstables::compress/compress: Make compression a virtual object