Extract register view functionality (#1056)

* WIP

* Create separate Register*Views functions that are called from main.

cmd/fnserver/main.go

@@ -3,6 +3,9 @@ package main
 import (
 	"context"
 
+	"github.com/fnproject/fn/api/agent"
+	"github.com/fnproject/fn/api/agent/drivers/docker"
+	"github.com/fnproject/fn/api/logs/s3"
 	"github.com/fnproject/fn/api/server"
 	// EXTENSIONS: Add extension imports here or use `fn build-server`. Learn more: https://github.com/fnproject/fn/blob/master/docs/operating/extending.md
 
@@ -12,5 +15,21 @@ import (
 func main() {
 	ctx := context.Background()
 	funcServer := server.NewFromEnv(ctx)
+
+	registerViews()
 	funcServer.Start(ctx)
 }
+
+func registerViews() {
+	// Register views in agent package
+	keys := []string{"fn_appname", "fn_path"}
+	agent.RegisterAgentViews(keys)
+	agent.RegisterDockerViews(keys)
+	agent.RegisterContainerViews(keys)
+
+	// Register docker client views
+	docker.RegisterViews(keys)
+
+	// Register s3 log views
+	s3.RegisterViews(keys)
+}