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runner.go
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runner.go
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package eventline
import (
"bufio"
"bytes"
"context"
"errors"
"fmt"
"io"
"path"
"strconv"
"sync"
"time"
"github.com/exograd/eventline/pkg/utils"
"github.com/exograd/go-daemon/check"
"github.com/exograd/go-daemon/daemon"
"github.com/exograd/go-daemon/dlog"
"github.com/exograd/go-daemon/pg"
)
var RunnerDefs = map[string]*RunnerDef{}
type StepFailureError struct {
err error
}
func NewStepFailureError(err error) *StepFailureError {
return &StepFailureError{err: err}
}
func (err *StepFailureError) Error() string {
return err.err.Error()
}
func (err *StepFailureError) Unwrap() error {
return err.err
}
type RunnerCfg interface {
check.Object
}
type RunnerDef struct {
Name string
Cfg RunnerCfg
InstantiateParameters func() RunnerParameters
InstantiateBehaviour func(*Runner) RunnerBehaviour
}
type RunnerInitData struct {
Log *dlog.Logger
Daemon *daemon.Daemon
Def *RunnerDef
Cfg RunnerCfg
Data *RunnerData
TerminationChan chan<- Id
RefreshInterval time.Duration
StopChan <-chan struct{}
Wg *sync.WaitGroup
}
type RunnerData struct {
JobExecution *JobExecution
StepExecutions StepExecutions
ExecutionContext *ExecutionContext
Project *Project
ProjectSettings *ProjectSettings
}
type RunnerBehaviour interface {
DirPath() string
Init(ctx context.Context) error
Terminate()
ExecuteStep(context.Context, *StepExecution, *Step, io.WriteCloser, io.WriteCloser) error
}
type Runner struct {
Log *dlog.Logger
Daemon *daemon.Daemon
Cfg RunnerCfg
Behaviour RunnerBehaviour
JobExecution *JobExecution
StepExecutions StepExecutions
ExecutionContext *ExecutionContext
Project *Project
ProjectSettings *ProjectSettings
RunnerIdentity *Identity
Environment map[string]string
FileSet *FileSet
Scope Scope
// Keep a private copy to avoid potential concurrency issues with
// JobExecution since we need the id in both the main goroutine and the
// refresh goroutine.
jeId Id
refreshInterval time.Duration
terminationChan chan<- Id
StopChan <-chan struct{}
Wg *sync.WaitGroup
}
func NewRunner(data RunnerInitData) (*Runner, error) {
fileSet, err := data.Data.FileSet()
if err != nil {
return nil, fmt.Errorf("cannot create file set: %w", err)
}
r := &Runner{
Log: data.Log,
Daemon: data.Daemon,
Cfg: data.Cfg,
JobExecution: data.Data.JobExecution,
StepExecutions: data.Data.StepExecutions,
ExecutionContext: data.Data.ExecutionContext,
Project: data.Data.Project,
ProjectSettings: data.Data.ProjectSettings,
Environment: data.Data.Environment(),
FileSet: fileSet,
Scope: NewProjectScope(data.Data.Project.Id),
jeId: data.Data.JobExecution.Id,
refreshInterval: data.RefreshInterval,
terminationChan: data.TerminationChan,
StopChan: data.StopChan,
Wg: data.Wg,
}
if runner := data.Data.JobExecution.JobSpec.Runner; runner != nil {
if iname := runner.Identity; iname != "" {
identities := data.Data.ExecutionContext.Identities
identity, found := identities[iname]
if !found {
// That should never happen since ExecutionContext.Load is
// supposed to load all identities referenced by the job
// specification.
return nil, fmt.Errorf("missing runner identity %q", iname)
}
r.RunnerIdentity = identity
}
}
r.Behaviour = data.Def.InstantiateBehaviour(r)
r.Environment["EVENTLINE_DIR"] = r.Behaviour.DirPath()
return r, nil
}
func (r *Runner) Start() error {
r.Wg.Add(1)
go r.main()
return nil
}
func (r *Runner) Stopping() bool {
select {
case <-r.StopChan:
return true
default:
return false
}
}
func (r *Runner) main() {
defer r.Wg.Done()
defer r.Behaviour.Terminate()
var cse *StepExecution
defer func() { r.terminationChan <- r.jeId }()
defer func() {
if value := recover(); value != nil {
msg, trace := utils.RecoverValueData(value)
r.Log.Error("panic: %s\n%s", msg, trace)
panicErr := fmt.Errorf("panic: %s", msg)
if cse != nil {
_, _, err := r.updateStepExecutionFailure(r.jeId, cse.Id,
panicErr, r.Scope)
if err != nil {
r.HandleError(fmt.Errorf("cannot update step %d: %w",
cse.Position, err))
return
}
}
r.HandleError(panicErr)
}
}()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
go func() {
select {
case <-r.StopChan:
cancel()
case <-ctx.Done():
}
}()
if err := r.initExecution(ctx); err != nil {
r.HandleError(err)
return
}
go r.mainRefresh(ctx, cancel)
r.Log.Info("starting execution")
for i, se := range r.StepExecutions {
if r.Stopping() {
r.HandleInterruption()
return
}
step := r.JobExecution.JobSpec.Steps[i]
r.Log.Info("executing step %d", se.Position)
// We update the step execution here and not in Runner.executeStep
// because we want to set the current step execution (cse) after the
// start but before calling executeStep, to make sure the recovery
// function works as intended.
_, _, err := r.updateStepExecutionStart(r.jeId, se.Id, r.Scope)
if err != nil {
r.HandleError(fmt.Errorf("cannot update step %d: %w",
se.Position, err))
return
}
cse = se
if err := r.executeStep(ctx, se, step); err != nil {
r.HandleError(err)
return
}
}
r.Log.Info("execution finished")
if _, err := r.updateJobExecutionSuccess(r.jeId, r.Scope); err != nil {
r.Log.Error("cannot update job execution: %v", err)
return
}
}
func (r *Runner) mainRefresh(ctx context.Context, cancel context.CancelFunc) {
ticker := time.NewTicker(r.refreshInterval)
defer ticker.Stop()
for {
select {
case <-ticker.C:
case <-ctx.Done():
return
}
if _, err := r.refreshJobExecution(); err != nil {
r.Log.Error("cannot refresh job execution: %v", err)
var jobExecutionFinishedErr *JobExecutionFinishedError
if errors.As(err, &jobExecutionFinishedErr) {
cancel()
}
return
}
}
}
func (r *Runner) initExecution(ctx context.Context) error {
if err := r.Behaviour.Init(ctx); err != nil {
switch {
case errors.Is(err, context.Canceled):
return fmt.Errorf("initialization interrupted")
case errors.Is(err, context.DeadlineExceeded):
return fmt.Errorf("initialization timeout")
default:
return err
}
}
return nil
}
func (r *Runner) executeStep(ctx context.Context, se *StepExecution, step *Step) error {
jeId := r.JobExecution.Id
// Create pipes used to read the output of the executed program
stdoutRead, stdoutWrite := io.Pipe()
stderrRead, stderrWrite := io.Pipe()
// Create output readers
errChan := make(chan error, 2)
defer close(errChan)
var wg sync.WaitGroup
wg.Add(2)
go r.readOutput(se, stdoutRead, "stdout", errChan, &wg)
go r.readOutput(se, stderrRead, "stderr", errChan, &wg)
// Execute the step
err := r.Behaviour.ExecuteStep(ctx, se, step, stdoutWrite, stderrWrite)
// Close pipes and wait for output readers to terminate
stdoutRead.Close()
stderrRead.Close()
wg.Wait()
// Check for reader errors; in practice, the only possible error is an
// unability to update the step execution.
select {
case outputErr := <-errChan:
if outputErr != nil {
return outputErr
}
default:
}
// Handle the execution result
//
// We separate errors indicating that the command failed and errors
// associated with execution itself.
//
// We only handle the step execution; if this function returns an error,
// the caller will update the job execution.
if err != nil {
var stepFailureErr *StepFailureError
switch {
case errors.Is(err, context.Canceled):
return fmt.Errorf("execution of step %d interrupted", se.Position)
case errors.Is(err, context.DeadlineExceeded):
return fmt.Errorf("execution of step %d timed out", se.Position)
case errors.As(err, &stepFailureErr):
_, _, updateErr := r.updateStepExecutionFailure(jeId, se.Id, err,
r.Scope)
if updateErr != nil {
return fmt.Errorf("cannot update step execution %q: %w",
se.Id, err)
}
if step.AbortOnFailure() {
return fmt.Errorf("cannot execute step %d: %w",
se.Position, err)
}
return nil
default:
// Even if the job is supposed to continue (i.e. if the step has
// on_failure equal to 'continue'), an execution error always
// causes the job to fail: if we cannot execute a job, we probably
// will not be able to execute the next one.
return fmt.Errorf("cannot execute step %d: %w", se.Position, err)
}
}
// Mark the step as successful
_, _, err = r.updateStepExecutionSuccess(jeId, se.Id, r.Scope)
if err != nil {
return fmt.Errorf("cannot update step %d: %w", se.Position, err)
}
return nil
}
func (r *Runner) readOutput(se *StepExecution, output io.ReadCloser, name string, errChan chan<- error, wg *sync.WaitGroup) {
defer wg.Done()
bufferedOutput := bufio.NewReader(output)
var line []byte
for {
data, isPrefix, err := bufferedOutput.ReadLine()
if err != nil && !errors.Is(err, io.ErrClosedPipe) {
errChan <- fmt.Errorf("cannot read command output %q: %v",
name, err)
return
}
if err == nil {
line = append(line, data...)
if isPrefix {
continue
}
}
// There is no point in updating se.Output because we are not going to
// read it in the runner, so we may as well avoid allocating and
// copying data. This only works because se.Update does not modify the
// output column, so it will not be erased when updating the step
// execution later.
if len(line) > 0 {
err = r.UpdateStepExecutionOutput(se, append(line, '\n'))
if err != nil {
errChan <- fmt.Errorf("cannot update step execution %q: %v",
se.Id, err)
return
}
line = nil
}
if errors.Is(err, io.EOF) || errors.Is(err, io.ErrClosedPipe) {
break
}
}
}
func (r *Runner) HandleInterruption() {
r.Log.Info("execution interrupted")
je, ses, err := r.updateJobExecutionAbortion(r.JobExecution.Id, r.Scope)
if err != nil {
r.Log.Error("%v", err)
}
r.JobExecution = je
r.StepExecutions = ses
}
func (r *Runner) HandleError(err error) {
r.Log.Error("%v", err)
je, ses, err := r.updateJobExecutionFailure(r.JobExecution.Id, err,
r.Scope)
if err != nil {
r.Log.Error("%v", err)
}
r.JobExecution = je
r.StepExecutions = ses
}
func (rd *RunnerData) Environment() map[string]string {
env := map[string]string{
"EVENTLINE": "true",
"EVENTLINE_PROJECT_ID": rd.Project.Id.String(),
"EVENTLINE_PROJECT_NAME": rd.Project.Name,
"EVENTLINE_JOB_ID": rd.JobExecution.JobId.String(),
"EVENTLINE_JOB_NAME": rd.JobExecution.JobSpec.Name,
"EVENTLINE_JOB_EXECUTION_ID": rd.JobExecution.Id.String(),
}
for _, i := range rd.ExecutionContext.Identities {
for name, value := range i.Data.Environment() {
env[name] = value
}
}
for name, value := range rd.JobExecution.JobSpec.Environment {
env[name] = value
}
for _, param := range rd.JobExecution.JobSpec.Parameters {
if param.Environment == "" {
continue
}
if value, found := rd.JobExecution.Parameters[param.Name]; found {
env[param.Environment] = param.ValueString(value)
}
}
return env
}
func (rd *RunnerData) FileSet() (*FileSet, error) {
fs := NewFileSet()
// Execution context
ectxData, err := rd.ExecutionContext.Encode()
if err != nil {
return nil, fmt.Errorf("cannot encode execution context: %w", err)
}
fs.AddFile("context.json", ectxData, 0600)
// Step files
for i, step := range rd.JobExecution.JobSpec.Steps {
if step.Code != "" || step.Script != nil {
var code string
if step.Code != "" {
code = step.Code
} else if step.Script != nil {
code = step.Script.Content
}
var buf bytes.Buffer
if !StartsWithShebang(code) {
buf.WriteString(rd.ProjectSettings.CodeHeader)
}
buf.WriteString(code)
filePath := path.Join("steps", strconv.Itoa(i+1))
fs.AddFile(filePath, buf.Bytes(), 0700)
}
}
// Parameters
parameterFields, err := JSONFields(rd.ExecutionContext.Parameters)
if err != nil {
return nil, fmt.Errorf("cannot extract parameter fields: %w", err)
}
for name, value := range parameterFields {
filePath := path.Join("parameters", name)
fs.AddFile(filePath, []byte(value), 0600)
}
// Event fields
if rd.ExecutionContext.Event != nil {
eventFields, err := JSONFields(rd.ExecutionContext.Event.Data)
if err != nil {
return nil, fmt.Errorf("cannot extract event fields: %w", err)
}
for name, value := range eventFields {
filePath := path.Join("event", name)
fs.AddFile(filePath, []byte(value), 0600)
}
}
// Identity fields
for iname, identity := range rd.ExecutionContext.Identities {
identityFields, err := JSONFields(identity.Data)
if err != nil {
return nil, fmt.Errorf("cannot extract identity fields: %w", err)
}
for name, value := range identityFields {
filePath := path.Join("identities", iname, name)
fs.AddFile(filePath, []byte(value), 0600)
}
}
return fs, nil
}
func (r *Runner) StepCommand(se *StepExecution, s *Step, rootPath string) (name string, args []string) {
switch {
case s.Code != "":
name = path.Join(rootPath, "steps", strconv.Itoa(se.Position))
case s.Command != nil:
name = s.Command.Name
args = s.Command.Arguments
case s.Script != nil:
name = path.Join(rootPath, "steps", strconv.Itoa(se.Position))
args = s.Script.Arguments
default:
utils.Panicf("unhandled step %#v", s)
}
return
}
func (r *Runner) StepCommandString(se *StepExecution, s *Step, rootPath string) string {
name, args := r.StepCommand(se, s, rootPath)
var buf bytes.Buffer
buf.WriteString(name)
for _, arg := range args {
buf.WriteByte(' ')
buf.WriteString(utils.ShellEscape(arg))
}
return buf.String()
}
func (r *Runner) updateJobExecutionSuccess(jeId Id, scope Scope) (*JobExecution, error) {
var je JobExecution
err := r.Daemon.Pg.WithTx(func(conn pg.Conn) error {
if err := je.LoadForUpdate(conn, jeId, scope); err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
}
if je.Status == JobExecutionStatusAborted {
return &JobExecutionAbortedError{Id: jeId}
}
now := time.Now().UTC()
je.Status = JobExecutionStatusSuccessful
je.EndTime = &now
je.RefreshTime = nil
if err := je.Update(conn); err != nil {
return fmt.Errorf("cannot update job execution: %w", err)
}
return nil
})
if err != nil {
return nil, err
}
return &je, nil
}
func (r *Runner) updateJobExecutionAbortion(jeId Id, scope Scope) (*JobExecution, StepExecutions, error) {
var je JobExecution
var ses StepExecutions
err := r.Daemon.Pg.WithTx(func(conn pg.Conn) error {
if err := je.LoadForUpdate(conn, jeId, scope); err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
}
if je.Status == JobExecutionStatusAborted {
return &JobExecutionAbortedError{Id: jeId}
}
now := time.Now().UTC()
je.Status = JobExecutionStatusAborted
je.EndTime = &now
je.RefreshTime = nil
if err := je.Update(conn); err != nil {
return fmt.Errorf("cannot update job execution: %w", err)
}
if err := ses.LoadByJobExecutionId(conn, jeId); err != nil {
return fmt.Errorf("cannot load step executions: %w", err)
}
for _, se := range ses {
if !se.Finished() {
se.Status = StepExecutionStatusAborted
if se.StartTime != nil {
se.EndTime = &now
}
if err := se.Update(conn); err != nil {
return fmt.Errorf("cannot update step %d: %w",
se.Position, err)
}
}
}
return nil
})
if err != nil {
return nil, nil, err
}
return &je, ses, nil
}
func (r *Runner) updateJobExecutionFailure(jeId Id, jeErr error, scope Scope) (*JobExecution, StepExecutions, error) {
var je JobExecution
var ses StepExecutions
err := r.Daemon.Pg.WithTx(func(conn pg.Conn) error {
if err := je.LoadForUpdate(conn, jeId, scope); err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
}
if je.Status == JobExecutionStatusAborted {
return &JobExecutionAbortedError{Id: jeId}
}
now := time.Now().UTC()
je.Status = JobExecutionStatusFailed
je.EndTime = &now
je.FailureMessage = jeErr.Error()
je.RefreshTime = nil
if err := je.Update(conn); err != nil {
return fmt.Errorf("cannot update job execution: %w", err)
}
if err := ses.LoadByJobExecutionId(conn, jeId); err != nil {
return fmt.Errorf("cannot load step executions: %w", err)
}
for _, se := range ses {
if !se.Finished() {
se.Status = StepExecutionStatusAborted
if se.StartTime != nil {
se.EndTime = &now
}
if err := se.Update(conn); err != nil {
return fmt.Errorf("cannot update step %d: %w",
se.Position, err)
}
}
}
return nil
})
if err != nil {
return nil, nil, err
}
return &je, ses, nil
}
func (r *Runner) updateStepExecutionStart(jeId, seId Id, scope Scope) (*JobExecution, *StepExecution, error) {
return r.updateStepExecution(jeId, seId, func(se *StepExecution) {
now := time.Now().UTC()
se.Status = StepExecutionStatusStarted
se.StartTime = &now
se.FailureMessage = ""
se.Output = ""
}, scope)
}
func (r *Runner) updateStepExecutionAborted(jeId, seId Id, scope Scope) (*JobExecution, *StepExecution, error) {
return r.updateStepExecution(jeId, seId, func(se *StepExecution) {
now := time.Now().UTC()
se.Status = StepExecutionStatusAborted
se.EndTime = &now
}, scope)
}
func (r *Runner) updateStepExecutionSuccess(jeId, seId Id, scope Scope) (*JobExecution, *StepExecution, error) {
return r.updateStepExecution(jeId, seId, func(se *StepExecution) {
now := time.Now().UTC()
se.Status = StepExecutionStatusSuccessful
se.EndTime = &now
}, scope)
}
func (r *Runner) updateStepExecutionFailure(jeId, seId Id, err error, scope Scope) (*JobExecution, *StepExecution, error) {
return r.updateStepExecution(jeId, seId, func(se *StepExecution) {
now := time.Now().UTC()
se.Status = StepExecutionStatusFailed
se.EndTime = &now
se.FailureMessage = err.Error()
}, scope)
}
func (r *Runner) updateStepExecution(jeId, seId Id, fn func(*StepExecution), scope Scope) (*JobExecution, *StepExecution, error) {
var je JobExecution
var se StepExecution
err := r.Daemon.Pg.WithTx(func(conn pg.Conn) error {
if err := je.LoadForUpdate(conn, jeId, scope); err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
}
if je.Status == JobExecutionStatusAborted {
return &JobExecutionAbortedError{Id: jeId}
}
if err := se.Load(conn, seId, scope); err != nil {
return fmt.Errorf("cannot load step execution: %w", err)
}
fn(&se)
if err := se.Update(conn); err != nil {
return err
}
return nil
})
if err != nil {
return nil, nil, err
}
return &je, &se, nil
}
func (r *Runner) UpdateStepExecutionOutput(se *StepExecution, data []byte) error {
return r.Daemon.Pg.WithConn(func(conn pg.Conn) (err error) {
err = se.UpdateOutput(conn, data)
return
})
}
func (r *Runner) refreshJobExecution() (*JobExecution, error) {
var je JobExecution
err := r.Daemon.Pg.WithTx(func(conn pg.Conn) error {
if err := je.LoadForUpdate(conn, r.jeId, r.Scope); err != nil {
return fmt.Errorf("cannot load job execution: %w", err)
}
if je.Finished() {
return &JobExecutionFinishedError{Id: r.jeId}
}
now := time.Now().UTC()
je.RefreshTime = &now
if err := je.UpdateRefreshTime(conn); err != nil {
return fmt.Errorf("cannot update job execution: %w", err)
}
return nil
})
if err != nil {
return nil, err
}
return &je, nil
}