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main.go
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main.go
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// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: MIT-0
package main
import (
"aws-lambda-extensions/cache-extension-demo/extension"
"aws-lambda-extensions/cache-extension-demo/ipc"
"aws-lambda-extensions/cache-extension-demo/plugins"
"context"
"os"
"os/signal"
"syscall"
)
var (
extensionClient = extension.NewClient(os.Getenv("AWS_LAMBDA_RUNTIME_API"))
)
func main() {
ctx, cancel := context.WithCancel(context.Background())
sigs := make(chan os.Signal, 1)
signal.Notify(sigs, syscall.SIGTERM, syscall.SIGINT)
go func() {
s := <-sigs
cancel()
println(plugins.PrintPrefix, "Received", s)
println(plugins.PrintPrefix, "Exiting")
}()
res, err := extensionClient.Register(ctx, plugins.ExtensionName)
if err != nil {
panic(err)
}
println(plugins.PrintPrefix, "Register response:", plugins.PrettyPrint(res))
// Initialize all the cache plugins
extension.InitCacheExtensions()
// Start HTTP server
ipc.Start("4000")
// Will block until shutdown event is received or cancelled via the context.
processEvents(ctx)
}
// Method to process events
func processEvents(ctx context.Context) {
for {
select {
case <-ctx.Done():
return
default:
println(plugins.PrintPrefix, "Waiting for event...")
res, err := extensionClient.NextEvent(ctx)
if err != nil {
println(plugins.PrintPrefix, "Error:", err)
println(plugins.PrintPrefix, "Exiting")
return
}
// Exit if we receive a SHUTDOWN event
if res.EventType == extension.Shutdown {
println(plugins.PrintPrefix, "Received SHUTDOWN event")
println(plugins.PrintPrefix, "Exiting")
return
}
}
}
}