load-balancer

A toy load balancer in go

Implemented starting from the tut here: https://kasvith.me/posts/lets-create-a-simple-lb-go/

Going to work on adding features mentioned at the end

Add way to check whether a given backend actually works instead of just responding to a ping

config file should include a request to use to see if the server is responding

• setup default tcp request using this or similar

  host := "example.com" port := "80" timeout := time.Duration(1 * time.Second) _, err := net.DialTimeout("tcp", host+":"+port, timeout) if err != nil { fmt.Printf("%s %s %s\n", host, "not responding", err.Error()) } else { fmt.Printf("%s %s %s\n", host, "responding on port:", port) }

• time how long it takes to respond and log that

• prioritize faster backends instead of round robin?

• any point in being able to parse api spec to automatically determine endpoint to check with?

TODO:

• start testing
  • do more research on go testing best practices
• implement health checking in independent goroutines
• figure out how to make those actually run in parallel xD
• implement a distributed consensus system
  • pick something easy like raft or a newer leaderless consensus system
  • create a log of uptime stats and configuration details
  • in order for distributed consensus for configuration to make sense thee will need to be a way to update config without a restart