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// Copyright (c) 2019-2022, Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package instance
import (
"bufio"
"encoding/json"
"fmt"
"net"
"strconv"
"testing"
"time"
"github.com/sylabs/singularity/v4/e2e/internal/e2e"
)
const instanceStartPort = 11372
type instance struct {
Image string `json:"img"`
Instance string `json:"instance"`
Pid int `json:"pid"`
}
type instanceList struct {
Instances []instance `json:"instances"`
}
//nolint:unparam
func (c *ctx) stopInstance(t *testing.T, instance string, stopArgs ...string) (stdout string, stderr string, success bool) {
args := stopArgs
if instance != "" {
args = append(args, instance)
}
c.env.RunSingularity(
t,
e2e.WithProfile(c.profile),
e2e.WithCommand("instance stop"),
e2e.WithArgs(args...),
e2e.PostRun(func(t *testing.T) {
success = !t.Failed()
}),
e2e.ExpectExit(0, e2e.GetStreams(&stdout, &stderr)),
)
c.expectInstance(t, instance, 0)
return
}
//nolint:unparam
func (c *ctx) execInstance(t *testing.T, instance string, execArgs ...string) (stdout string, stderr string, success bool) {
args := []string{"instance://" + instance}
args = append(args, execArgs...)
c.env.RunSingularity(
t,
e2e.WithProfile(c.profile),
e2e.WithCommand("exec"),
e2e.WithArgs(args...),
e2e.PostRun(func(t *testing.T) {
success = !t.Failed()
}),
e2e.ExpectExit(0, e2e.GetStreams(&stdout, &stderr)),
)
return
}
// Check if there is the number of expected instances with the provided name.
func (c *ctx) expectInstance(t *testing.T, name string, nb int) {
listInstancesFn := func(t *testing.T, r *e2e.SingularityCmdResult) {
var instances instanceList
if err := json.Unmarshal([]byte(r.Stdout), &instances); err != nil {
t.Errorf("Error while decoding JSON from 'instance list': %v", err)
}
if nb != len(instances.Instances) {
t.Errorf("%d instance %q found, expected %d", len(instances.Instances), name, nb)
}
}
c.env.RunSingularity(
t,
e2e.WithProfile(c.profile),
e2e.WithCommand("instance list"),
e2e.WithArgs([]string{"--json", name}...),
e2e.ExpectExit(0, listInstancesFn),
)
}
// Sends a deterministic message to an echo server and expects the same, or a
// reversed, message in response.
func echo(t *testing.T, port int, reverse bool) {
const (
message = "b40cbeaaea293f7e8bd40fb61f389cfca9823467\n"
reversedMessage = "7643289acfc983f16bf04db8e7f392aeaaebc04b\n"
)
expectResponse := message
if reverse {
expectResponse = reversedMessage
}
// give it some time for responding, attempt 10 times by
// waiting 100 millisecond between each try
for retries := 0; ; retries++ {
sock, sockErr := net.Dial("tcp", "127.0.0.1:"+strconv.Itoa(port))
if sockErr != nil && retries < 10 {
time.Sleep(100 * time.Millisecond)
continue
} else if sockErr != nil {
t.Errorf("Failed to dial echo server: %v", sockErr)
return
}
fmt.Fprint(sock, message)
response, responseErr := bufio.NewReader(sock).ReadString('\n')
if responseErr != nil || response != expectResponse {
t.Errorf("Bad response: err = %v, response %q != %q", responseErr, response, expectResponse)
}
break
}
}
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