Migrated ZRANK Command

[prabhavdogra]

Summary by CodeRabbit

• New Features
  • Added a new command that retrieves the rank of a member in a sorted collection. When the optional flag is enabled, the corresponding score is also returned.
  • Enhanced response formatting for lists of integer values, ensuring clearer and more consistent outputs.
  • These enhancements ensure a refined user experience with reliable command execution.

[coderabbitai[bot]]

Walkthrough

The pull request introduces a new "ZRANK" command in the cmd package, which retrieves the rank (and optionally the score) of a member in a sorted set. It includes functions for argument parsing, evaluation, and execution, along with error handling for cases such as invalid arguments, missing keys, or absent members. Additionally, a new helper function is added in cmds.go to convert an integer slice into a command result using Google Protobuf.

Changes

File Path	Change Summary
internal/cmd/cmd_zrank.go	- Added new ZRANK command with metadata, parsing (parseZRANKArgs), evaluation (evalZRANK), and execution (executeZRANK) functions. - Implements error handling for key/member validation. - Command registered during initialization.
internal/cmd/cmds.go	- Introduced new function cmdResIntSlice to convert a slice of int64 values into a CmdRes with a Protobuf value list. - Added import for structpb from google.golang.org/protobuf/types/known/structpb.

Sequence Diagram(s)

sequenceDiagram
    participant Client as Client
    participant CP as Command Processor
    participant ZRFunc as ZRANK Functions
    participant Store as Data Store

    Client->>CP: Submit "ZRANK" command with arguments
    CP->>CP: Invoke parseZRANKArgs to validate input
    CP->>Store: Check for existence of key and member
    Store-->>CP: Return validation/lookup results
    CP->>ZRFunc: Call evalZRANK for rank (and score) evaluation
    ZRFunc-->>CP: Return rank (and optional score) or error
    CP->>Client: Respond with command result

Poem

I'm a rabbit hopping through the byte-filled lane,
New commands spring forth like a joyful refrain.
ZRANK brings ranks with a gentle pace,
Integer slices join the digital race.
In lines of code, I celebrate this nifty gain!
🐰💻 Happy hops in the realm of code!

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• [ ] 📝 Generate Docstrings

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