为什么AWS API Gateway Websocket发送错误

Question

I am using serverless framework to set up an AWS API Gateway websocket which calls a lambda function written in Go. Right now the handler only logs a message. I can connect to the websocket, and I can see the message is logged in Cloudwatch when I send a message through the socket, but I always get an error message that looks like

{
  "message": "Internal server error",
  "connectionId": "eU3C1cE7CYcCJPw=",
  "requestId": "eU3EQFX0iYcFysQ="
}

There are no errors logged for the lambda in Cloudwatch. The AWS API Gateway config looks good to me. I'm at a loss trying to think of what could cause this.

My main.go:

package main

import (
    "fmt"

    "github.com/aws/aws-lambda-go/events"
    "github.com/aws/aws-lambda-go/lambda"
)

func Handler(request events.APIGatewayWebsocketProxyRequest) {
    fmt.Println("default function ran")
}

func main() {
    lambda.Start(Handler)
}

Probably not super relevant but the serverless.yaml config:

functions:
  websocket-default:
    handler: bin/ws
    events:
      - websocket:
          route: $default

The payload I'm sending:

{
  "action": "whatever",
  "data":  "{whatever}"
}

Answer 1

Not sure if this is the only problem in your code, but your handler signature should be one listed in the doc:

func ()
func () error
func (TIn) error
func () (TOut, error)
func (context.Context) error
func (context.Context, TIn) error
func (context.Context) (TOut, error)
func (context.Context, TIn) (TOut, error)