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job.go
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job.go
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package e2eutil
import (
"context"
"fmt"
"io"
"io/ioutil"
"os/exec"
"regexp"
"strings"
"testing"
"time"
"github.com/stretchr/testify/assert"
)
// Register registers a jobspec from a file but with a unique ID.
// The caller is responsible for recording that ID for later cleanup.
func Register(jobID, jobFilePath string) error {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
return register(jobID, jobFilePath, exec.CommandContext(ctx, "nomad", "job", "run", "-detach", "-"))
}
// RegisterWithArgs registers a jobspec from a file but with a unique ID. The
// optional args are added to the run command. The caller is responsible for
// recording that ID for later cleanup.
func RegisterWithArgs(jobID, jobFilePath string, args ...string) error {
baseArgs := []string{"job", "run", "-detach"}
for i := range args {
baseArgs = append(baseArgs, args[i])
}
baseArgs = append(baseArgs, "-")
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
return register(jobID, jobFilePath, exec.CommandContext(ctx, "nomad", baseArgs...))
}
func register(jobID, jobFilePath string, cmd *exec.Cmd) error {
stdin, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("could not open stdin?: %w", err)
}
content, err := ioutil.ReadFile(jobFilePath)
if err != nil {
return fmt.Errorf("could not open job file: %w", err)
}
// hack off the first line to replace with our unique ID
var re = regexp.MustCompile(`(?m)^job ".*" \{`)
jobspec := re.ReplaceAllString(string(content),
fmt.Sprintf("job \"%s\" {", jobID))
go func() {
defer stdin.Close()
io.WriteString(stdin, jobspec)
}()
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("could not register job: %w\n%v", err, string(out))
}
return nil
}
// PeriodicForce forces a periodic job to dispatch
func PeriodicForce(jobID string) error {
// nomad job periodic force
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
cmd := exec.CommandContext(ctx, "nomad", "job", "periodic", "force", jobID)
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("could not register job: %w\n%v", err, string(out))
}
return nil
}
// Dispatch dispatches a parameterized job
func Dispatch(jobID string, meta map[string]string, payload string) error {
// nomad job periodic force
args := []string{"job", "dispatch"}
for k, v := range meta {
args = append(args, "-meta", fmt.Sprintf("%v=%v", k, v))
}
args = append(args, jobID)
if payload != "" {
args = append(args, "-")
}
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
cmd := exec.CommandContext(ctx, "nomad", args...)
cmd.Stdin = strings.NewReader(payload)
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("could not dispatch job: %w\n%v", err, string(out))
}
return nil
}
// JobInspectTemplate runs nomad job inspect and formats the output
// using the specified go template
func JobInspectTemplate(jobID, template string) (string, error) {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
cmd := exec.CommandContext(ctx, "nomad", "job", "inspect", "-t", template, jobID)
out, err := cmd.CombinedOutput()
if err != nil {
return "", fmt.Errorf("could not inspect job: %w\n%v", err, string(out))
}
outStr := string(out)
outStr = strings.TrimSuffix(outStr, "\n")
return outStr, nil
}
// RegisterFromJobspec registers a jobspec from a string, also with a unique
// ID. The caller is responsible for recording that ID for later cleanup.
func RegisterFromJobspec(jobID, jobspec string) error {
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
cmd := exec.CommandContext(ctx, "nomad", "job", "run", "-detach", "-")
stdin, err := cmd.StdinPipe()
if err != nil {
return fmt.Errorf("could not open stdin?: %w", err)
}
// hack off the first line to replace with our unique ID
var re = regexp.MustCompile(`^job "\w+" \{`)
jobspec = re.ReplaceAllString(jobspec,
fmt.Sprintf("job \"%s\" {", jobID))
go func() {
defer stdin.Close()
io.WriteString(stdin, jobspec)
}()
out, err := cmd.CombinedOutput()
if err != nil {
return fmt.Errorf("could not register job: %w\n%v", err, string(out))
}
return nil
}
func ChildrenJobSummary(jobID string) ([]map[string]string, error) {
out, err := Command("nomad", "job", "status", jobID)
if err != nil {
return nil, fmt.Errorf("nomad job status failed: %w", err)
}
section, err := GetSection(out, "Children Job Summary")
if err != nil {
section, err = GetSection(out, "Parameterized Job Summary")
if err != nil {
return nil, fmt.Errorf("could not find children job summary section: %w", err)
}
}
summary, err := ParseColumns(section)
if err != nil {
return nil, fmt.Errorf("could not parse children job summary section: %w", err)
}
return summary, nil
}
func PreviouslyLaunched(jobID string) ([]map[string]string, error) {
out, err := Command("nomad", "job", "status", jobID)
if err != nil {
return nil, fmt.Errorf("nomad job status failed: %w", err)
}
section, err := GetSection(out, "Previously Launched Jobs")
if err != nil {
return nil, fmt.Errorf("could not find previously launched jobs section: %w", err)
}
summary, err := ParseColumns(section)
if err != nil {
return nil, fmt.Errorf("could not parse previously launched jobs section: %w", err)
}
return summary, nil
}
func DispatchedJobs(jobID string) ([]map[string]string, error) {
out, err := Command("nomad", "job", "status", jobID)
if err != nil {
return nil, fmt.Errorf("nomad job status failed: %w", err)
}
section, err := GetSection(out, "Dispatched Jobs")
if err != nil {
return nil, fmt.Errorf("could not find previously launched jobs section: %w", err)
}
summary, err := ParseColumns(section)
if err != nil {
return nil, fmt.Errorf("could not parse previously launched jobs section: %w", err)
}
return summary, nil
}
func StopJob(jobID string, args ...string) error {
// Build our argument list in the correct order, ensuring the jobID is last
// and the Nomad subcommand are first.
baseArgs := []string{"job", "stop"}
for i := range args {
baseArgs = append(baseArgs, args[i])
}
baseArgs = append(baseArgs, jobID)
// Execute the command. We do not care about the stdout, only stderr.
_, err := Command("nomad", baseArgs...)
if err != nil {
// When stopping a job and monitoring the resulting deployment, we
// expect that the monitor fails and exits with status code one because
// technically the deployment has failed. Overwrite the error to be
// nil.
if strings.Contains(err.Error(), "Description = Cancelled because job is stopped") ||
strings.Contains(err.Error(), "Description = Failed due to progress deadline") {
err = nil
}
}
return err
}
// CleanupJobsAndGC stops and purges the list of jobIDs and runs a
// system gc. Returns a func so that the return value can be used
// in t.Cleanup
func CleanupJobsAndGC(t *testing.T, jobIDs *[]string) func() {
return func() {
for _, jobID := range *jobIDs {
err := StopJob(jobID, "-purge", "-detach")
assert.NoError(t, err)
}
_, err := Command("nomad", "system", "gc")
assert.NoError(t, err)
}
}
// CleanupJobsAndGCWithContext stops and purges the list of jobIDs and runs a
// system gc. The passed context allows callers to cancel the execution of the
// cleanup as they desire. This is useful for tests which attempt to remove the
// job as part of their run, but may fail before that point is reached.
func CleanupJobsAndGCWithContext(t *testing.T, ctx context.Context, jobIDs *[]string) {
// Check the context before continuing. If this has been closed return,
// otherwise fallthrough and complete the work.
select {
case <-ctx.Done():
return
default:
}
for _, jobID := range *jobIDs {
err := StopJob(jobID, "-purge", "-detach")
assert.NoError(t, err)
}
_, err := Command("nomad", "system", "gc")
assert.NoError(t, err)
}