add rate limit

[vearne]

Summary by CodeRabbit

• New Features

  • Introduced rate limiting capabilities, allowing users to set a maximum number of queries per second through a command-line flag.
  • Enhanced the Emitter functionality to incorporate rate limiting behavior, improving message processing control.

• Bug Fixes

  • Improved performance and resource management by preventing excessive message processing based on defined limits.

• Documentation

  • Updated configuration settings to include a field for rate limiting, enhancing clarity and organization.

[coderabbitai[bot]]

[!CAUTION]

Review failed

The pull request is closed.

Walkthrough

The recent changes introduce a rate limiting feature to the application, enhancing its control over message emissions and resource management. A new Limiter interface and corresponding implementation enable the system to restrict the frequency of queries based on user-defined settings. The updates optimize the Emitter struct and its associated functions, ensuring efficient message processing while adhering to specified limits, ultimately improving application performance under load.

Changes

Files	Change Summary
biz/emitter.go, biz/itf.go, biz/ratelimit.go, config/settings.go, main.go	The changes introduce a Limiter interface and a new RateLimitQPS field, enhancing the Emitter functionality with rate limiting capabilities. The NewEmitter function now accepts a limiter, and a new NewRateLimit function creates a rate limiter based on application settings. The main function is updated to incorporate this setup, allowing dynamic control over query throughput.
go.mod	Added golang.org/x/time as an indirect dependency to support the new rate limiting features.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant Main
    participant Emitter
    participant Limiter

    User->>Main: Start Application
    Main->>Main: Parse RateLimitQPS Flag
    Main->>Limiter: Create New Rate Limit
    Main->>Emitter: NewEmitter with Limiter
    Emitter->>Limiter: Check Allow()
    Limiter-->>Emitter: Allow/Block
    Emitter->>Emitter: Process Messages

🐇 In the meadow, we gather 'round,
With limits set, no haste to be found.
Queries flow, but not too fast,
With each new change, our fun will last!
So hop along, with joy we play,
Rate limits here, to save the day! 🌼

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