// Copyright 2020 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package network

import (
	"fmt"
	"testing"

	"gvisor.dev/gvisor/pkg/test/dockerutil"
	"gvisor.dev/gvisor/test/benchmarks/tools"
)

// see Dockerfile '//images/benchmarks/httpd'.
var httpdDocs = map[string]string{
	"notfound": "notfound",
	"1Kb":      "latin1k.txt",
	"10Kb":     "latin10k.txt",
	"100Kb":    "latin100k.txt",
	"1Mb":      "latin1024k.txt",
	"10Mb":     "latin10240k.txt",
}

// BenchmarkHttpdConcurrency iterates the concurrency argument and tests
// how well the runtime under test handles requests in parallel.
func BenchmarkHttpdConcurrency(b *testing.B) {
	// The test iterates over client concurrency, so set other parameters.
	concurrency := []int{1, 25, 50, 100, 1000}

	for _, c := range concurrency {
		b.Run(fmt.Sprintf("%d", c), func(b *testing.B) {
			hey := &tools.Hey{
				Requests:    c * b.N,
				Concurrency: c,
				Doc:         httpdDocs["10Kb"],
			}
			runHttpd(b, hey, false /* reverse */)
		})
	}
}

// BenchmarkHttpdDocSize iterates over different sized payloads, testing how
// well the runtime handles sending different payload sizes.
func BenchmarkHttpdDocSize(b *testing.B) {
	benchmarkHttpdDocSize(b, false /* reverse */)
}

// BenchmarkReverseHttpdDocSize iterates over different sized payloads, testing
// how well the runtime handles receiving different payload sizes.
func BenchmarkReverseHttpdDocSize(b *testing.B) {
	benchmarkHttpdDocSize(b, true /* reverse */)
}

// benchmarkHttpdDocSize iterates through all doc sizes, running subbenchmarks
// for each size.
func benchmarkHttpdDocSize(b *testing.B, reverse bool) {
	b.Helper()
	for name, filename := range httpdDocs {
		concurrency := []int{1, 25, 50, 100, 1000}
		for _, c := range concurrency {
			b.Run(fmt.Sprintf("%s_%d", name, c), func(b *testing.B) {
				hey := &tools.Hey{
					Requests:    c * b.N,
					Concurrency: c,
					Doc:         filename,
				}
				runHttpd(b, hey, reverse)
			})
		}
	}
}

// runHttpd configures the static serving methods to run httpd.
func runHttpd(b *testing.B, hey *tools.Hey, reverse bool) {
	// httpd runs on port 80.
	port := 80
	httpdRunOpts := dockerutil.RunOpts{
		Image: "benchmarks/httpd",
		Ports: []int{port},
		Env: []string{
			// Standard environmental variables for httpd.
			"APACHE_RUN_DIR=/tmp",
			"APACHE_RUN_USER=nobody",
			"APACHE_RUN_GROUP=nogroup",
			"APACHE_LOG_DIR=/tmp",
			"APACHE_PID_FILE=/tmp/apache.pid",
		},
	}
	httpdCmd := []string{"sh", "-c", "mkdir -p /tmp/html; cp -r /local/* /tmp/html/.; apache2 -X"}
	runStaticServer(b, httpdRunOpts, httpdCmd, port, hey, reverse)
}