// workUnitStatus extracts a summary of the status of a single work
// unit. This produces its external coordinate status and the active
// attempt (if any) on success.
func workUnitStatus(workUnit coordinate.WorkUnit) (status WorkUnitStatus, attempt coordinate.Attempt, err error) {
var attemptStatus coordinate.AttemptStatus
attempt, err = workUnit.ActiveAttempt()
if err == nil && attempt == nil {
// NB: this also includes "delayed" status
status = Available
return
}
if err == nil {
attemptStatus, err = attempt.Status()
}
if err == nil {
switch attemptStatus {
case coordinate.Pending:
status = Pending
case coordinate.Expired:
status = Available
attempt = nil
case coordinate.Finished:
status = Finished
case coordinate.Failed:
status = Failed
case coordinate.Retryable:
status = Available
attempt = nil
default:
err = errors.New("unexpected attempt status")
}
}
return
}
func (api *restAPI) WorkUnitsPost(ctx *context, in interface{}) (interface{}, error) {
var (
err error
unit coordinate.WorkUnit
short restdata.WorkUnitShort
)
repr, valid := in.(restdata.WorkUnit)
if !valid {
err = errUnmarshal
}
if err == nil {
var meta coordinate.WorkUnitMeta
if repr.Meta != nil {
meta = *repr.Meta
}
unit, err = ctx.WorkSpec.AddWorkUnit(repr.Name, repr.Data, meta)
}
if err == nil {
err = api.fillWorkUnitShort(ctx.Namespace, ctx.WorkSpec, unit.Name(), &short)
}
if err == nil {
resp := responseCreated{
Location: short.URL,
Body: short,
}
return resp, nil
}
return nil, err
}
// TestChainingExpiry tests that, if an attempt finishes but is no
// longer the active attempt, then its successor work units will not
// be created.
func TestChainingExpiry(t *testing.T) {
var (
one, two coordinate.WorkSpec
err error
unit coordinate.WorkUnit
)
sts := SimpleTestSetup{
NamespaceName: "TestChainingExpiry",
WorkerName: "worker",
}
sts.SetUp(t)
defer sts.TearDown(t)
one, err = sts.Namespace.SetWorkSpec(map[string]interface{}{
"name": "one",
"then": "two",
})
if !assert.NoError(t, err) {
return
}
sts.WorkSpec = one
two, err = sts.Namespace.SetWorkSpec(map[string]interface{}{
"name": "two",
"disabled": true,
})
if !assert.NoError(t, err) {
return
}
// Create and perform a work unit, with no output
unit, err = one.AddWorkUnit("a", map[string]interface{}{}, coordinate.WorkUnitMeta{})
if !assert.NoError(t, err) {
return
}
attempt := sts.RequestOneAttempt(t)
// But wait! We got preempted
err = unit.ClearActiveAttempt()
assert.NoError(t, err)
sts.RequestOneAttempt(t)
// Now, let the original attempt finish, trying to generate
// more outputs
err = attempt.Finish(map[string]interface{}{
"output": []string{"unit"},
})
assert.NoError(t, err)
// Since attempt is no longer active, this shouldn't generate
// new outputs
units, err := two.WorkUnits(coordinate.WorkUnitQuery{})
if assert.NoError(t, err) {
assert.Empty(t, units)
}
}
// TestWorkUnitPrioritySet tests two different ways of setting work unit
// priority.
func TestWorkUnitPrioritySet(t *testing.T) {
var (
err error
unit coordinate.WorkUnit
)
sts := SimpleTestSetup{
NamespaceName: "TestWorkUnitPrioritySet",
WorkerName: "worker",
WorkSpecName: "spec",
}
sts.SetUp(t)
defer sts.TearDown(t)
unit, err = sts.WorkSpec.AddWorkUnit("a", map[string]interface{}{}, coordinate.WorkUnitMeta{})
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 0.0)
}
unit, err = sts.WorkSpec.AddWorkUnit("b", map[string]interface{}{}, coordinate.WorkUnitMeta{})
if assert.NoError(t, err) {
err = unit.SetPriority(10.0)
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 10.0)
}
}
unit, err = sts.WorkSpec.AddWorkUnit("c", map[string]interface{}{}, coordinate.WorkUnitMeta{})
assert.NoError(t, err)
err = sts.WorkSpec.SetWorkUnitPriorities(coordinate.WorkUnitQuery{
Names: []string{"c"},
}, 20.0)
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 20.0)
}
unit, err = sts.WorkSpec.AddWorkUnit("d", map[string]interface{}{}, coordinate.WorkUnitMeta{})
assert.NoError(t, err)
err = sts.WorkSpec.AdjustWorkUnitPriorities(coordinate.WorkUnitQuery{
Names: []string{"d"},
}, 20.0)
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 20.0)
}
err = sts.WorkSpec.AdjustWorkUnitPriorities(coordinate.WorkUnitQuery{
Names: []string{"d"},
}, 10.0)
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 30.0)
}
unit, err = sts.WorkSpec.WorkUnit("b")
if assert.NoError(t, err) {
UnitHasPriority(t, unit, 10.0)
}
sts.CheckWorkUnitOrder(t, "d", "c", "b", "a")
}
func (w *worker) MakeAttempt(unit coordinate.WorkUnit, lifetime time.Duration) (coordinate.Attempt, error) {
req := restdata.AttemptSpecific{
WorkSpec: unit.WorkSpec().Name(),
WorkUnit: unit.Name(),
Lifetime: lifetime,
}
var a attempt
err := w.PostTo(w.Representation.MakeAttemptURL, map[string]interface{}{}, req, &a.Representation)
if err != nil {
return nil, err
}
a.URL, err = w.URL.Parse(a.Representation.URL)
if err != nil {
return nil, err
}
aUnit, _ := unit.(*workUnit)
err = a.fillReferences(aUnit, w)
if err != nil {
return nil, err
}
return &a, nil
}
// UnitHasPriority validates the priority of a work unit.
func UnitHasPriority(t *testing.T, unit coordinate.WorkUnit, priority float64) {
actual, err := unit.Priority()
if assert.NoError(t, err) {
assert.Equal(t, priority, actual)
}
}
// TestByRuntime creates two work specs with different runtimes, and
// validates that requests that want a specific runtime get it.
func TestByRuntime(t *testing.T) {
// The specific thing we'll simulate here is one Python
// worker, using the jobserver interface, with an empty
// runtime string, plus one Go worker, using the native API,
// with a "go" runtime.
var (
err error
pSpec, gSpec coordinate.WorkSpec
pUnit, gUnit coordinate.WorkUnit
attempts []coordinate.Attempt
)
sts := SimpleTestSetup{
NamespaceName: "TestByRuntime",
WorkerName: "worker",
}
sts.SetUp(t)
defer sts.TearDown(t)
pSpec, err = sts.Namespace.SetWorkSpec(map[string]interface{}{
"name": "p",
})
if !assert.NoError(t, err) {
return
}
pUnit, err = pSpec.AddWorkUnit("p", map[string]interface{}{}, coordinate.WorkUnitMeta{})
if !assert.NoError(t, err) {
return
}
gSpec, err = sts.Namespace.SetWorkSpec(map[string]interface{}{
"name": "g",
"runtime": "go",
})
if !assert.NoError(t, err) {
return
}
gUnit, err = gSpec.AddWorkUnit("g", map[string]interface{}{}, coordinate.WorkUnitMeta{})
if !assert.NoError(t, err) {
return
}
// If we use default settings for RequestAttempts, we should
// get back both work units
Clock.Add(5 * time.Second)
attempts, err = sts.Worker.RequestAttempts(coordinate.AttemptRequest{})
if assert.NoError(t, err) && assert.Len(t, attempts, 1) {
err = attempts[0].Finish(map[string]interface{}{})
assert.NoError(t, err)
wasP := attempts[0].WorkUnit().Name() == "p"
// Get more attempts
Clock.Add(time.Duration(5) * time.Second)
attempts, err = sts.Worker.RequestAttempts(coordinate.AttemptRequest{})
if assert.NoError(t, err) && assert.Len(t, attempts, 1) {
err = attempts[0].Finish(map[string]interface{}{})
assert.NoError(t, err)
// Should have gotten the other work spec
if wasP {
assert.Equal(t, "g", attempts[0].WorkUnit().Name())
} else {
assert.Equal(t, "p", attempts[0].WorkUnit().Name())
}
}
// Now there shouldn't be anything more
Clock.Add(5 * time.Second)
sts.RequestNoAttempts(t)
}
// Reset the world
err = pUnit.ClearActiveAttempt()
assert.NoError(t, err)
err = gUnit.ClearActiveAttempt()
assert.NoError(t, err)
// What we expect to get from jobserver
Clock.Add(5 * time.Second)
attempts, err = sts.Worker.RequestAttempts(coordinate.AttemptRequest{
Runtimes: []string{""},
})
if assert.NoError(t, err) && assert.Len(t, attempts, 1) {
assert.Equal(t, "p", attempts[0].WorkUnit().Name())
err = attempts[0].Retry(map[string]interface{}{}, time.Duration(0))
assert.NoError(t, err)
}
// A more sophisticated Python check
Clock.Add(5 * time.Second)
attempts, err = sts.Worker.RequestAttempts(coordinate.AttemptRequest{
Runtimes: []string{"python", "python_2", "python_2.7", ""},
})
if assert.NoError(t, err) && assert.Len(t, attempts, 1) {
assert.Equal(t, "p", attempts[0].WorkUnit().Name())
err = attempts[0].Retry(map[string]interface{}{}, time.Duration(0))
assert.NoError(t, err)
}
// What we expect to get from Go land
Clock.Add(5 * time.Second)
attempts, err = sts.Worker.RequestAttempts(coordinate.AttemptRequest{
Runtimes: []string{"go"},
})
if assert.NoError(t, err) && assert.Len(t, attempts, 1) {
assert.Equal(t, "g", attempts[0].WorkUnit().Name())
err = attempts[0].Retry(map[string]interface{}{}, time.Duration(0))
assert.NoError(t, err)
}
}
// UpdateWorkUnit causes some state change in a work unit. If the
// work unit is pending, this is the principal interface to complete
// or renew it; if it is already complete this can cause it to be
// retried.
func (jobs *JobServer) UpdateWorkUnit(
workSpecName string,
workUnitKey string,
options map[string]interface{},
) (bool, string, error) {
// Note that in several corner cases, the behavior of this as
// written disagrees with Python coordinated's:
//
// * If neither "lease_time" nor "status" is specified,
// Python coordinated immediately returns False without
// checking if workUnitKey is valid
//
// * Python coordinated allows arbitrary status changes,
// including AVAILABLE -> FINISHED
//
// * This openly ignores "worker_id", as distinct from Python
// coordinated, which logs an obscure warning and changes it,
// but only on a renew
var (
attempt coordinate.Attempt
changed bool
err error
status coordinate.AttemptStatus
uwuOptions UpdateWorkUnitOptions
workSpec coordinate.WorkSpec
workUnit coordinate.WorkUnit
)
err = decode(&uwuOptions, options)
if err == nil {
workSpec, err = jobs.Namespace.WorkSpec(workSpecName)
}
if err == nil {
workUnit, err = workSpec.WorkUnit(workUnitKey)
}
if err == nil {
if workUnit == nil {
return false, fmt.Sprintf("no such work unit key=%v", workUnitKey), nil
}
}
if err == nil {
attempt, err = workUnit.ActiveAttempt()
}
if err == nil && attempt != nil {
status, err = attempt.Status()
}
if err == nil && attempt != nil {
if status == coordinate.Expired || status == coordinate.Retryable {
// The Python Coordinate API sees both of these
// statuses as "available", and we want to fall
// into the next block.
attempt = nil
}
}
if err == nil && attempt == nil {
// Caller is trying to manipulate an AVAILABLE work
// unit. Either they are trying to change the work
// unit data in place, or they are trying to jump a
// work unit directly to a completed state. (The
// latter is possible during the Python work unit
// parent cleanup, if the timing is bad.)
if uwuOptions.Status == Available || uwuOptions.Status == 0 {
// The only thing we are doing is changing the
// work unit data.
if uwuOptions.Data != nil {
meta, err := workUnit.Meta()
if err == nil {
_, err = workSpec.AddWorkUnit(workUnit.Name(), uwuOptions.Data, meta)
}
if err == nil {
changed = true
}
}
return changed && err == nil, "", err
}
// Otherwise we are trying to transition to another
// state; so force-create an attempt.
worker, err := jobs.Namespace.Worker(uwuOptions.WorkerID)
if err == nil {
attempt, err = worker.MakeAttempt(workUnit, uwuOptions.LeaseDuration())
status = coordinate.Pending
}
}
if err == nil {
switch status {
case coordinate.Pending:
changed = true // or there's an error
switch uwuOptions.Status {
case 0, Pending:
err = attempt.Renew(uwuOptions.LeaseDuration(), uwuOptions.Data)
case Available:
err = attempt.Expire(uwuOptions.Data)
case Finished:
err = attempt.Finish(uwuOptions.Data)
case Failed:
err = attempt.Fail(uwuOptions.Data)
default:
err = errors.New("update_work_unit invalid status")
}
case coordinate.Expired:
err = errors.New("update_work_unit logic error, trying to refresh expired unit")
case coordinate.Finished:
switch uwuOptions.Status {
case 0, Finished:
changed = false // no-op
case Available:
err = workUnit.ClearActiveAttempt()
changed = true
case Failed:
changed = false // see below
default:
err = errors.New("update_work_unit cannot change finished unit")
}
case coordinate.Failed:
switch uwuOptions.Status {
case 0, Failed:
changed = false // no-op
case Available: // "retry"
err = workUnit.ClearActiveAttempt()
changed = true
case Finished:
// The Python worker, with two separate
// processes, has a race wherein there
// could be 15 seconds to go, the parent
// kills off the child, and the child
// finishes successfully, all at the same
// time. In that case the successful
// finish should win.
err = attempt.Finish(nil)
changed = true
default:
err = errors.New("update_work_unit cannot change failed unit")
}
case coordinate.Retryable:
err = errors.New("update_work_unit logic error, trying to refresh retryable unit")
default:
err = fmt.Errorf("update_work_unit invalid attempt status %+v", status)
}
}
return changed && err == nil, "", err
}
func (api *restAPI) fillWorkUnit(namespace coordinate.Namespace, spec coordinate.WorkSpec, unit coordinate.WorkUnit, repr *restdata.WorkUnit) error {
err := api.fillWorkUnitShort(namespace, spec, unit.Name(), &repr.WorkUnitShort)
if err == nil {
repr.Data, err = unit.Data()
}
if err == nil {
var meta coordinate.WorkUnitMeta
meta, err = unit.Meta()
repr.Meta = &meta
}
if err == nil {
repr.Status, err = unit.Status()
}
if err == nil {
err = buildURLs(api.Router,
"namespace", namespace.Name(),
"spec", spec.Name(),
"unit", unit.Name(),
).
URL(&repr.WorkSpecURL, "workSpec").
URL(&repr.AttemptsURL, "workUnitAttempts").
Error
}
if err == nil {
var attempt coordinate.Attempt
attempt, err = unit.ActiveAttempt()
if err == nil && attempt != nil {
// This is cheating, a little, but it's probably
// the easiest way to reuse this code
var short restdata.AttemptShort
err = api.fillAttemptShort(namespace, attempt, &short)
if err == nil {
repr.ActiveAttemptURL = short.URL
}
}
}
return err
}