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Wen Hui authored
This is an enhancement for INFO command, previously INFO only support one argument for different info section , if user want to get more categories information, either perform INFO all / default or calling INFO for multiple times. **Description of the feature** The goal of adding this feature is to let the user retrieve multiple categories via the INFO command, and still avoid emitting the same section twice. A use case for this is like Redis Sentinel, which periodically calling INFO command to refresh info from monitored Master/Slaves, only Server and Replication part categories are used for parsing information. If the INFO command can return just enough categories that client side needs, it can save a lot of time for client side parsing it as well as network bandwidth. **Implementation** To share code between redis, sentinel, and other users of INFO (DEBUG and modules), we have a new `genInfoSectionDict` function that returns a dict and some boolean flags (e.g. `all`) to the caller (built from user input). Sentinel is later purging unwanted sections from that, and then it is forwarded to the info `genRedisInfoString`. **Usage Examples** INFO Server Replication INFO CPU Memory INFO default commandstats Co-authored-by:
Oran Agra <oran@redislabs.com>
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