Move cron module to independent package

Make it easier to keep track of upstream changes and bug fixes
9 years ago · d8a994ef24
--- a/.gopmfile
+++ b/.gopmfile
@@ -17,6 +17,7 @@ github.com/go-sql-driver/mysql = commit:b4db83c
 github.com/go-xorm/core = commit:1e2868c
 github.com/go-xorm/xorm = 
 github.com/gogits/chardet = commit:2404f77725
 github.com/gogits/cron = 
 github.com/gogits/git-module = commit:3b40eae
 github.com/gogits/go-gogs-client = 
 github.com/issue9/identicon = commit:f8c0d2c
--- a/models/cron/cron.go
+++ b/models/cron/cron.go
@@ -1,59 +0,0 @@
 // Copyright 2014 The Gogs Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.

 package cron

 import (
 	"time"

 	"github.com/gogits/gogs/models"
 	"github.com/gogits/gogs/modules/cron"
 	"github.com/gogits/gogs/modules/log"
 	"github.com/gogits/gogs/modules/setting"
 )

 var c = cron.New()

 func NewContext() {
 	var (
 		entry *cron.Entry
 		err   error
 	)
 	if setting.Cron.UpdateMirror.Enabled {
 		entry, err = c.AddFunc("Update mirrors", setting.Cron.UpdateMirror.Schedule, models.MirrorUpdate)
 		if err != nil {
 			log.Fatal(4, "Cron[Update mirrors]: %v", err)
 		}
 		if setting.Cron.UpdateMirror.RunAtStart {
 			entry.Prev = time.Now()
 			go models.MirrorUpdate()
 		}
 	}
 	if setting.Cron.RepoHealthCheck.Enabled {
 		entry, err = c.AddFunc("Repository health check", setting.Cron.RepoHealthCheck.Schedule, models.GitFsck)
 		if err != nil {
 			log.Fatal(4, "Cron[Repository health check]: %v", err)
 		}
 		if setting.Cron.RepoHealthCheck.RunAtStart {
 			entry.Prev = time.Now()
 			go models.GitFsck()
 		}
 	}
 	if setting.Cron.CheckRepoStats.Enabled {
 		entry, err = c.AddFunc("Check repository statistics", setting.Cron.CheckRepoStats.Schedule, models.CheckRepoStats)
 		if err != nil {
 			log.Fatal(4, "Cron[Check repository statistics]: %v", err)
 		}
 		if setting.Cron.CheckRepoStats.RunAtStart {
 			entry.Prev = time.Now()
 			go models.CheckRepoStats()
 		}
 	}
 	c.Start()
 }

 // ListTasks returns all running cron tasks.
 func ListTasks() []*cron.Entry {
 	return c.Entries()
 }
--- a/modules/cron/constantdelay.go
+++ b/modules/cron/constantdelay.go
@@ -1,27 +0,0 @@
 package cron

 import "time"

 // ConstantDelaySchedule represents a simple recurring duty cycle, e.g. "Every 5 minutes".
 // It does not support jobs more frequent than once a second.
 type ConstantDelaySchedule struct {
 	Delay time.Duration
 }

 // Every returns a crontab Schedule that activates once every duration.
 // Delays of less than a second are not supported (will round up to 1 second).
 // Any fields less than a Second are truncated.
 func Every(duration time.Duration) ConstantDelaySchedule {
 	if duration < time.Second {
 		duration = time.Second
 	}
 	return ConstantDelaySchedule{
 		Delay: duration - time.Duration(duration.Nanoseconds())%time.Second,
 	}
 }

 // Next returns the next time this should be run.
 // This rounds so that the next activation time will be on the second.
 func (schedule ConstantDelaySchedule) Next(t time.Time) time.Time {
 	return t.Add(schedule.Delay - time.Duration(t.Nanosecond())*time.Nanosecond)
 }
--- a/modules/cron/constantdelay_test.go
+++ b/modules/cron/constantdelay_test.go
@@ -1,54 +0,0 @@
 package cron

 import (
 	"testing"
 	"time"
 )

 func TestConstantDelayNext(t *testing.T) {
 	tests := []struct {
 		time     string
 		delay    time.Duration
 		expected string
 	}{
 		// Simple cases
 		{"Mon Jul 9 14:45 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},
 		{"Mon Jul 9 14:59 2012", 15 * time.Minute, "Mon Jul 9 15:14 2012"},
 		{"Mon Jul 9 14:59:59 2012", 15 * time.Minute, "Mon Jul 9 15:14:59 2012"},

 		// Wrap around hours
 		{"Mon Jul 9 15:45 2012", 35 * time.Minute, "Mon Jul 9 16:20 2012"},

 		// Wrap around days
 		{"Mon Jul 9 23:46 2012", 14 * time.Minute, "Tue Jul 10 00:00 2012"},
 		{"Mon Jul 9 23:45 2012", 35 * time.Minute, "Tue Jul 10 00:20 2012"},
 		{"Mon Jul 9 23:35:51 2012", 44*time.Minute + 24*time.Second, "Tue Jul 10 00:20:15 2012"},
 		{"Mon Jul 9 23:35:51 2012", 25*time.Hour + 44*time.Minute + 24*time.Second, "Thu Jul 11 01:20:15 2012"},

 		// Wrap around months
 		{"Mon Jul 9 23:35 2012", 91*24*time.Hour + 25*time.Minute, "Thu Oct 9 00:00 2012"},

 		// Wrap around minute, hour, day, month, and year
 		{"Mon Dec 31 23:59:45 2012", 15 * time.Second, "Tue Jan 1 00:00:00 2013"},

 		// Round to nearest second on the delay
 		{"Mon Jul 9 14:45 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},

 		// Round up to 1 second if the duration is less.
 		{"Mon Jul 9 14:45:00 2012", 15 * time.Millisecond, "Mon Jul 9 14:45:01 2012"},

 		// Round to nearest second when calculating the next time.
 		{"Mon Jul 9 14:45:00.005 2012", 15 * time.Minute, "Mon Jul 9 15:00 2012"},

 		// Round to nearest second for both.
 		{"Mon Jul 9 14:45:00.005 2012", 15*time.Minute + 50*time.Nanosecond, "Mon Jul 9 15:00 2012"},
 	}

 	for _, c := range tests {
 		actual := Every(c.delay).Next(getTime(c.time))
 		expected := getTime(c.expected)
 		if actual != expected {
 			t.Errorf("%s, \"%s\": (expected) %v != %v (actual)", c.time, c.delay, expected, actual)
 		}
 	}
 }
--- a/modules/cron/cron.go
+++ b/modules/cron/cron.go
@@ -1,4 +1,3 @@
 // Copyright 2012 Rob Figueiredo. All rights reserved.
 // Copyright 2014 The Gogs Authors. All rights reserved.
 // Use of this source code is governed by a MIT-style
 // license that can be found in the LICENSE file.
@@ -6,207 +5,59 @@
 package cron

 import (
 	"sort"
 	"time"
 )

 // Cron keeps track of any number of entries, invoking the associated func as
 // specified by the schedule. It may be started, stopped, and the entries may
 // be inspected while running.
 type Cron struct {
 	entries  []*Entry
 	stop     chan struct{}
 	add      chan *Entry
 	snapshot chan []*Entry
 	running  bool
 }

 // Job is an interface for submitted cron jobs.
 type Job interface {
 	Run()
 }

 // The Schedule describes a job's duty cycle.
 type Schedule interface {
 	// Return the next activation time, later than the given time.
 	// Next is invoked initially, and then each time the job is run.
 	Next(time.Time) time.Time
 }

 // Entry consists of a schedule and the func to execute on that schedule.
 type Entry struct {
 	Description string
 	Spec        string

 	// The schedule on which this job should be run.
 	Schedule Schedule

 	// The next time the job will run. This is the zero time if Cron has not been
 	// started or this entry's schedule is unsatisfiable
 	Next time.Time

 	// The last time this job was run. This is the zero time if the job has never
 	// been run.
 	Prev time.Time

 	// The Job to run.
 	Job Job

 	ExecTimes int // Execute times count.
 }

 // byTime is a wrapper for sorting the entry array by time
 // (with zero time at the end).
 type byTime []*Entry

 func (s byTime) Len() int      { return len(s) }
 func (s byTime) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
 func (s byTime) Less(i, j int) bool {
 	// Two zero times should return false.
 	// Otherwise, zero is "greater" than any other time.
 	// (To sort it at the end of the list.)
 	if s[i].Next.IsZero() {
 		return false
 	}
 	if s[j].Next.IsZero() {
 		return true
 	}
 	return s[i].Next.Before(s[j].Next)
 }

 // New returns a new Cron job runner.
 func New() *Cron {
 	return &Cron{
 		entries:  nil,
 		add:      make(chan *Entry),
 		stop:     make(chan struct{}),
 		snapshot: make(chan []*Entry),
 		running:  false,
 	}
 }

 // A wrapper that turns a func() into a cron.Job
 type FuncJob func()

 func (f FuncJob) Run() { f() }

 // AddFunc adds a func to the Cron to be run on the given schedule.
 func (c *Cron) AddFunc(desc, spec string, cmd func()) (*Entry, error) {
 	return c.AddJob(desc, spec, FuncJob(cmd))
 }

 // AddFunc adds a Job to the Cron to be run on the given schedule.
 func (c *Cron) AddJob(desc, spec string, cmd Job) (*Entry, error) {
 	schedule, err := Parse(spec)
 	if err != nil {
 		return nil, err
 	}
 	return c.Schedule(desc, spec, schedule, cmd), nil
 }
 	"github.com/gogits/cron"

 // Schedule adds a Job to the Cron to be run on the given schedule.
 func (c *Cron) Schedule(desc, spec string, schedule Schedule, cmd Job) *Entry {
 	entry := &Entry{
 		Description: desc,
 		Spec:        spec,
 		Schedule:    schedule,
 		Job:         cmd,
 	}
 	if c.running {
 		c.add <- entry
 	} else {
 		c.entries = append(c.entries, entry)
 	}
 	return entry
 }
 	"github.com/gogits/gogs/models"
 	"github.com/gogits/gogs/modules/log"
 	"github.com/gogits/gogs/modules/setting"
 )

 // Entries returns a snapshot of the cron entries.
 func (c *Cron) Entries() []*Entry {
 	if c.running {
 		c.snapshot <- nil
 		x := <-c.snapshot
 		return x
 var c = cron.New()

 func NewContext() {
 	var (
 		entry *cron.Entry
 		err   error
 	)
 	if setting.Cron.UpdateMirror.Enabled {
 		entry, err = c.AddFunc("Update mirrors", setting.Cron.UpdateMirror.Schedule, models.MirrorUpdate)
 		if err != nil {
 			log.Fatal(4, "Cron[Update mirrors]: %v", err)
 		}
 		if setting.Cron.UpdateMirror.RunAtStart {
 			entry.Prev = time.Now()
 			entry.ExecTimes++
 			go models.MirrorUpdate()
 		}
 	}
 	return c.entrySnapshot()
 }

 // Start the cron scheduler in its own go-routine.
 func (c *Cron) Start() {
 	c.running = true
 	go c.run()
 }

 // Run the scheduler.. this is private just due to the need to synchronize
 // access to the 'running' state variable.
 func (c *Cron) run() {
 	// Figure out the next activation times for each entry.
 	now := time.Now().Local()
 	for _, entry := range c.entries {
 		entry.Next = entry.Schedule.Next(now)
 	if setting.Cron.RepoHealthCheck.Enabled {
 		entry, err = c.AddFunc("Repository health check", setting.Cron.RepoHealthCheck.Schedule, models.GitFsck)
 		if err != nil {
 			log.Fatal(4, "Cron[Repository health check]: %v", err)
 		}
 		if setting.Cron.RepoHealthCheck.RunAtStart {
 			entry.Prev = time.Now()
 			entry.ExecTimes++
 			go models.GitFsck()
 		}
 	}

 	for {
 		// Determine the next entry to run.
 		sort.Sort(byTime(c.entries))

 		var effective time.Time
 		if len(c.entries) == 0 || c.entries[0].Next.IsZero() {
 			// If there are no entries yet, just sleep - it still handles new entries
 			// and stop requests.
 			effective = now.AddDate(10, 0, 0)
 		} else {
 			effective = c.entries[0].Next
 	if setting.Cron.CheckRepoStats.Enabled {
 		entry, err = c.AddFunc("Check repository statistics", setting.Cron.CheckRepoStats.Schedule, models.CheckRepoStats)
 		if err != nil {
 			log.Fatal(4, "Cron[Check repository statistics]: %v", err)
 		}

 		select {
 		case now = <-time.After(effective.Sub(now)):
 			// Run every entry whose next time was this effective time.
 			for _, e := range c.entries {
 				if e.Next != effective {
 					break
 				}
 				go e.Job.Run()
 				e.ExecTimes++
 				e.Prev = e.Next
 				e.Next = e.Schedule.Next(effective)
 			}
 			continue

 		case newEntry := <-c.add:
 			c.entries = append(c.entries, newEntry)
 			newEntry.Next = newEntry.Schedule.Next(now)

 		case <-c.snapshot:
 			c.snapshot <- c.entrySnapshot()

 		case <-c.stop:
 			return
 		if setting.Cron.CheckRepoStats.RunAtStart {
 			entry.Prev = time.Now()
 			entry.ExecTimes++
 			go models.CheckRepoStats()
 		}

 		// 'now' should be updated after newEntry and snapshot cases.
 		now = time.Now().Local()
 	}
 	c.Start()
 }

 // Stop the cron scheduler.
 func (c *Cron) Stop() {
 	c.stop <- struct{}{}
 	c.running = false
 }

 // entrySnapshot returns a copy of the current cron entry list.
 func (c *Cron) entrySnapshot() []*Entry {
 	entries := make([]*Entry, 0, len(c.entries))
 	for _, e := range c.entries {
 		entries = append(entries, &Entry{
 			Description: e.Description,
 			Spec:        e.Spec,
 			Schedule:    e.Schedule,
 			Next:        e.Next,
 			Prev:        e.Prev,
 			Job:         e.Job,
 			ExecTimes:   e.ExecTimes,
 		})
 	}
 	return entries
 // ListTasks returns all running cron tasks.
 func ListTasks() []*cron.Entry {
 	return c.Entries()
 }
--- a/modules/cron/cron_test.go
+++ b/modules/cron/cron_test.go
@@ -1,255 +0,0 @@
 package cron

 import (
 	"fmt"
 	"sync"
 	"testing"
 	"time"
 )

 // Many tests schedule a job for every second, and then wait at most a second
 // for it to run.  This amount is just slightly larger than 1 second to
 // compensate for a few milliseconds of runtime.
 const ONE_SECOND = 1*time.Second + 10*time.Millisecond

 // Start and stop cron with no entries.
 func TestNoEntries(t *testing.T) {
 	cron := New()
 	cron.Start()

 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-stop(cron):
 	}
 }

 // Start, stop, then add an entry. Verify entry doesn't run.
 func TestStopCausesJobsToNotRun(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	cron := New()
 	cron.Start()
 	cron.Stop()
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })

 	select {
 	case <-time.After(ONE_SECOND):
 		// No job ran!
 	case <-wait(wg):
 		t.FailNow()
 	}
 }

 // Add a job, start cron, expect it runs.
 func TestAddBeforeRunning(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	cron := New()
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })
 	cron.Start()
 	defer cron.Stop()

 	// Give cron 2 seconds to run our job (which is always activated).
 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 // Start cron, add a job, expect it runs.
 func TestAddWhileRunning(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	cron := New()
 	cron.Start()
 	defer cron.Stop()
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })

 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 // Test timing with Entries.
 func TestSnapshotEntries(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	cron := New()
 	cron.AddFunc("", "@every 2s", func() { wg.Done() })
 	cron.Start()
 	defer cron.Stop()

 	// Cron should fire in 2 seconds. After 1 second, call Entries.
 	select {
 	case <-time.After(ONE_SECOND):
 		cron.Entries()
 	}

 	// Even though Entries was called, the cron should fire at the 2 second mark.
 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}

 }

 // Test that the entries are correctly sorted.
 // Add a bunch of long-in-the-future entries, and an immediate entry, and ensure
 // that the immediate entry runs immediately.
 // Also: Test that multiple jobs run in the same instant.
 func TestMultipleEntries(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(2)

 	cron := New()
 	cron.AddFunc("", "0 0 0 1 1 ?", func() {})
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })
 	cron.AddFunc("", "0 0 0 31 12 ?", func() {})
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })

 	cron.Start()
 	defer cron.Stop()

 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 // Test running the same job twice.
 func TestRunningJobTwice(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(2)

 	cron := New()
 	cron.AddFunc("", "0 0 0 1 1 ?", func() {})
 	cron.AddFunc("", "0 0 0 31 12 ?", func() {})
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })

 	cron.Start()
 	defer cron.Stop()

 	select {
 	case <-time.After(2 * ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 func TestRunningMultipleSchedules(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(2)

 	cron := New()
 	cron.AddFunc("", "0 0 0 1 1 ?", func() {})
 	cron.AddFunc("", "0 0 0 31 12 ?", func() {})
 	cron.AddFunc("", "* * * * * ?", func() { wg.Done() })
 	cron.Schedule("", "", Every(time.Minute), FuncJob(func() {}))
 	cron.Schedule("", "", Every(time.Second), FuncJob(func() { wg.Done() }))
 	cron.Schedule("", "", Every(time.Hour), FuncJob(func() {}))

 	cron.Start()
 	defer cron.Stop()

 	select {
 	case <-time.After(2 * ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 // Test that the cron is run in the local time zone (as opposed to UTC).
 func TestLocalTimezone(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	now := time.Now().Local()
 	spec := fmt.Sprintf("%d %d %d %d %d ?",
 		now.Second()+1, now.Minute(), now.Hour(), now.Day(), now.Month())

 	cron := New()
 	cron.AddFunc("", spec, func() { wg.Done() })
 	cron.Start()
 	defer cron.Stop()

 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}
 }

 type testJob struct {
 	wg   *sync.WaitGroup
 	name string
 }

 func (t testJob) Run() {
 	t.wg.Done()
 }

 // Simple test using Runnables.
 func TestJob(t *testing.T) {
 	wg := &sync.WaitGroup{}
 	wg.Add(1)

 	cron := New()
 	cron.AddJob("", "0 0 0 30 Feb ?", testJob{wg, "job0"})
 	cron.AddJob("", "0 0 0 1 1 ?", testJob{wg, "job1"})
 	cron.AddJob("", "* * * * * ?", testJob{wg, "job2"})
 	cron.AddJob("", "1 0 0 1 1 ?", testJob{wg, "job3"})
 	cron.Schedule("", "", Every(5*time.Second+5*time.Nanosecond), testJob{wg, "job4"})
 	cron.Schedule("", "", Every(5*time.Minute), testJob{wg, "job5"})

 	cron.Start()
 	defer cron.Stop()

 	select {
 	case <-time.After(ONE_SECOND):
 		t.FailNow()
 	case <-wait(wg):
 	}

 	// Ensure the entries are in the right order.
 	expecteds := []string{"job2", "job4", "job5", "job1", "job3", "job0"}

 	var actuals []string
 	for _, entry := range cron.Entries() {
 		actuals = append(actuals, entry.Job.(testJob).name)
 	}

 	for i, expected := range expecteds {
 		if actuals[i] != expected {
 			t.Errorf("Jobs not in the right order.  (expected) %s != %s (actual)", expecteds, actuals)
 			t.FailNow()
 		}
 	}
 }

 func wait(wg *sync.WaitGroup) chan bool {
 	ch := make(chan bool)
 	go func() {
 		wg.Wait()
 		ch <- true
 	}()
 	return ch
 }

 func stop(cron *Cron) chan bool {
 	ch := make(chan bool)
 	go func() {
 		cron.Stop()
 		ch <- true
 	}()
 	return ch
 }
--- a/modules/cron/doc.go
+++ b/modules/cron/doc.go
@@ -1,129 +0,0 @@
 /*
 Package cron implements a cron spec parser and job runner.

 Usage

 Callers may register Funcs to be invoked on a given schedule.  Cron will run
 them in their own goroutines.

 	c := cron.New()
 	c.AddFunc("Every hour on the half hour","0 30 * * * *", func() { fmt.Println("Every hour on the half hour") })
 	c.AddFunc("Every hour","@hourly", func() { fmt.Println("Every hour") })
 	c.AddFunc("Every hour and a half","@every 1h30m", func() { fmt.Println("Every hour thirty") })
 	c.Start()
 	..
 	// Funcs are invoked in their own goroutine, asynchronously.
 	...
 	// Funcs may also be added to a running Cron
 	c.AddFunc("@daily", func() { fmt.Println("Every day") })
 	..
 	// Inspect the cron job entries' next and previous run times.
 	inspect(c.Entries())
 	..
 	c.Stop()  // Stop the scheduler (does not stop any jobs already running).

 CRON Expression Format

 A cron expression represents a set of times, using 6 space-separated fields.

 	Field name   | Mandatory? | Allowed values  | Allowed special characters
 	----------   | ---------- | --------------  | --------------------------
 	Seconds      | Yes        | 0-59            | * / , -
 	Minutes      | Yes        | 0-59            | * / , -
 	Hours        | Yes        | 0-23            | * / , -
 	Day of month | Yes        | 1-31            | * / , - ?
 	Month        | Yes        | 1-12 or JAN-DEC | * / , -
 	Day of week  | Yes        | 0-6 or SUN-SAT  | * / , - ?

 Note: Month and Day-of-week field values are case insensitive.  "SUN", "Sun",
 and "sun" are equally accepted.

 Special Characters

 Asterisk ( * )

 The asterisk indicates that the cron expression will match for all values of the
 field; e.g., using an asterisk in the 5th field (month) would indicate every
 month.

 Slash ( / )

 Slashes are used to describe increments of ranges. For example 3-59/15 in the
 1st field (minutes) would indicate the 3rd minute of the hour and every 15
 minutes thereafter. The form "*\/..." is equivalent to the form "first-last/...",
 that is, an increment over the largest possible range of the field.  The form
 "N/..." is accepted as meaning "N-MAX/...", that is, starting at N, use the
 increment until the end of that specific range.  It does not wrap around.

 Comma ( , )

 Commas are used to separate items of a list. For example, using "MON,WED,FRI" in
 the 5th field (day of week) would mean Mondays, Wednesdays and Fridays.

 Hyphen ( - )

 Hyphens are used to define ranges. For example, 9-17 would indicate every
 hour between 9am and 5pm inclusive.

 Question mark ( ? )

 Question mark may be used instead of '*' for leaving either day-of-month or
 day-of-week blank.

 Predefined schedules

 You may use one of several pre-defined schedules in place of a cron expression.

 	Entry                  | Description                                | Equivalent To
 	-----                  | -----------                                | -------------
 	@yearly (or @annually) | Run once a year, midnight, Jan. 1st        | 0 0 0 1 1 *
 	@monthly               | Run once a month, midnight, first of month | 0 0 0 1 * *
 	@weekly                | Run once a week, midnight on Sunday        | 0 0 0 * * 0
 	@daily (or @midnight)  | Run once a day, midnight                   | 0 0 0 * * *
 	@hourly                | Run once an hour, beginning of hour        | 0 0 * * * *

 Intervals

 You may also schedule a job to execute at fixed intervals.  This is supported by
 formatting the cron spec like this:

    @every <duration>

 where "duration" is a string accepted by time.ParseDuration
 (http://golang.org/pkg/time/#ParseDuration).

 For example, "@every 1h30m10s" would indicate a schedule that activates every
 1 hour, 30 minutes, 10 seconds.

 Note: The interval does not take the job runtime into account.  For example,
 if a job takes 3 minutes to run, and it is scheduled to run every 5 minutes,
 it will have only 2 minutes of idle time between each run.

 Time zones

 All interpretation and scheduling is done in the machine's local time zone (as
 provided by the Go time package (http://www.golang.org/pkg/time).

 Be aware that jobs scheduled during daylight-savings leap-ahead transitions will
 not be run!

 Thread safety

 Since the Cron service runs concurrently with the calling code, some amount of
 care must be taken to ensure proper synchronization.

 All cron methods are designed to be correctly synchronized as long as the caller
 ensures that invocations have a clear happens-before ordering between them.

 Implementation

 Cron entries are stored in an array, sorted by their next activation time.  Cron
 sleeps until the next job is due to be run.

 Upon waking:
 - it runs each entry that is active on that second
 - it calculates the next run times for the jobs that were run
 - it re-sorts the array of entries by next activation time.
 - it goes to sleep until the soonest job.
 */
 package cron
--- a/modules/cron/parser.go
+++ b/modules/cron/parser.go
@@ -1,231 +0,0 @@
 package cron

 import (
 	"fmt"
 	"log"
 	"math"
 	"strconv"
 	"strings"
 	"time"
 )

 // Parse returns a new crontab schedule representing the given spec.
 // It returns a descriptive error if the spec is not valid.
 //
 // It accepts
 //   - Full crontab specs, e.g. "* * * * * ?"
 //   - Descriptors, e.g. "@midnight", "@every 1h30m"
 func Parse(spec string) (_ Schedule, err error) {
 	// Convert panics into errors
 	defer func() {
 		if recovered := recover(); recovered != nil {
 			err = fmt.Errorf("%v", recovered)
 		}
 	}()

 	if spec[0] == '@' {
 		return parseDescriptor(spec), nil
 	}

 	// Split on whitespace.  We require 5 or 6 fields.
 	// (second) (minute) (hour) (day of month) (month) (day of week, optional)
 	fields := strings.Fields(spec)
 	if len(fields) != 5 && len(fields) != 6 {
 		log.Panicf("Expected 5 or 6 fields, found %d: %s", len(fields), spec)
 	}

 	// If a sixth field is not provided (DayOfWeek), then it is equivalent to star.
 	if len(fields) == 5 {
 		fields = append(fields, "*")
 	}

 	schedule := &SpecSchedule{
 		Second: getField(fields[0], seconds),
 		Minute: getField(fields[1], minutes),
 		Hour:   getField(fields[2], hours),
 		Dom:    getField(fields[3], dom),
 		Month:  getField(fields[4], months),
 		Dow:    getField(fields[5], dow),
 	}

 	return schedule, nil
 }

 // getField returns an Int with the bits set representing all of the times that
 // the field represents.  A "field" is a comma-separated list of "ranges".
 func getField(field string, r bounds) uint64 {
 	// list = range {"," range}
 	var bits uint64
 	ranges := strings.FieldsFunc(field, func(r rune) bool { return r == ',' })
 	for _, expr := range ranges {
 		bits |= getRange(expr, r)
 	}
 	return bits
 }

 // getRange returns the bits indicated by the given expression:
 //   number | number "-" number [ "/" number ]
 func getRange(expr string, r bounds) uint64 {

 	var (
 		start, end, step uint
 		rangeAndStep     = strings.Split(expr, "/")
 		lowAndHigh       = strings.Split(rangeAndStep[0], "-")
 		singleDigit      = len(lowAndHigh) == 1
 	)

 	var extra_star uint64
 	if lowAndHigh[0] == "*" || lowAndHigh[0] == "?" {
 		start = r.min
 		end = r.max
 		extra_star = starBit
 	} else {
 		start = parseIntOrName(lowAndHigh[0], r.names)
 		switch len(lowAndHigh) {
 		case 1:
 			end = start
 		case 2:
 			end = parseIntOrName(lowAndHigh[1], r.names)
 		default:
 			log.Panicf("Too many hyphens: %s", expr)
 		}
 	}

 	switch len(rangeAndStep) {
 	case 1:
 		step = 1
 	case 2:
 		step = mustParseInt(rangeAndStep[1])

 		// Special handling: "N/step" means "N-max/step".
 		if singleDigit {
 			end = r.max
 		}
 	default:
 		log.Panicf("Too many slashes: %s", expr)
 	}

 	if start < r.min {
 		log.Panicf("Beginning of range (%d) below minimum (%d): %s", start, r.min, expr)
 	}
 	if end > r.max {
 		log.Panicf("End of range (%d) above maximum (%d): %s", end, r.max, expr)
 	}
 	if start > end {
 		log.Panicf("Beginning of range (%d) beyond end of range (%d): %s", start, end, expr)
 	}

 	return getBits(start, end, step) | extra_star
 }

 // parseIntOrName returns the (possibly-named) integer contained in expr.
 func parseIntOrName(expr string, names map[string]uint) uint {
 	if names != nil {
 		if namedInt, ok := names[strings.ToLower(expr)]; ok {
 			return namedInt
 		}
 	}
 	return mustParseInt(expr)
 }

 // mustParseInt parses the given expression as an int or panics.
 func mustParseInt(expr string) uint {
 	num, err := strconv.Atoi(expr)
 	if err != nil {
 		log.Panicf("Failed to parse int from %s: %s", expr, err)
 	}
 	if num < 0 {
 		log.Panicf("Negative number (%d) not allowed: %s", num, expr)
 	}

 	return uint(num)
 }

 // getBits sets all bits in the range [min, max], modulo the given step size.
 func getBits(min, max, step uint) uint64 {
 	var bits uint64

 	// If step is 1, use shifts.
 	if step == 1 {
 		return ^(math.MaxUint64 << (max + 1)) & (math.MaxUint64 << min)
 	}

 	// Else, use a simple loop.
 	for i := min; i <= max; i += step {
 		bits |= 1 << i
 	}
 	return bits
 }

 // all returns all bits within the given bounds.  (plus the star bit)
 func all(r bounds) uint64 {
 	return getBits(r.min, r.max, 1) | starBit
 }

 // parseDescriptor returns a pre-defined schedule for the expression, or panics
 // if none matches.
 func parseDescriptor(spec string) Schedule {
 	switch spec {
 	case "@yearly", "@annually":
 		return &SpecSchedule{
 			Second: 1 << seconds.min,
 			Minute: 1 << minutes.min,
 			Hour:   1 << hours.min,
 			Dom:    1 << dom.min,
 			Month:  1 << months.min,
 			Dow:    all(dow),
 		}

 	case "@monthly":
 		return &SpecSchedule{
 			Second: 1 << seconds.min,
 			Minute: 1 << minutes.min,
 			Hour:   1 << hours.min,
 			Dom:    1 << dom.min,
 			Month:  all(months),
 			Dow:    all(dow),
 		}

 	case "@weekly":
 		return &SpecSchedule{
 			Second: 1 << seconds.min,
 			Minute: 1 << minutes.min,
 			Hour:   1 << hours.min,
 			Dom:    all(dom),
 			Month:  all(months),
 			Dow:    1 << dow.min,
 		}

 	case "@daily", "@midnight":
 		return &SpecSchedule{
 			Second: 1 << seconds.min,
 			Minute: 1 << minutes.min,
 			Hour:   1 << hours.min,
 			Dom:    all(dom),
 			Month:  all(months),
 			Dow:    all(dow),
 		}

 	case "@hourly":
 		return &SpecSchedule{
 			Second: 1 << seconds.min,
 			Minute: 1 << minutes.min,
 			Hour:   all(hours),
 			Dom:    all(dom),
 			Month:  all(months),
 			Dow:    all(dow),
 		}
 	}

 	const every = "@every "
 	if strings.HasPrefix(spec, every) {
 		duration, err := time.ParseDuration(spec[len(every):])
 		if err != nil {
 			log.Panicf("Failed to parse duration %s: %s", spec, err)
 		}
 		return Every(duration)
 	}

 	log.Panicf("Unrecognized descriptor: %s", spec)
 	return nil
 }
--- a/modules/cron/parser_test.go
+++ b/modules/cron/parser_test.go
@@ -1,117 +0,0 @@
 package cron

 import (
 	"reflect"
 	"testing"
 	"time"
 )

 func TestRange(t *testing.T) {
 	ranges := []struct {
 		expr     string
 		min, max uint
 		expected uint64
 	}{
 		{"5", 0, 7, 1 << 5},
 		{"0", 0, 7, 1 << 0},
 		{"7", 0, 7, 1 << 7},

 		{"5-5", 0, 7, 1 << 5},
 		{"5-6", 0, 7, 1<<5 | 1<<6},
 		{"5-7", 0, 7, 1<<5 | 1<<6 | 1<<7},

 		{"5-6/2", 0, 7, 1 << 5},
 		{"5-7/2", 0, 7, 1<<5 | 1<<7},
 		{"5-7/1", 0, 7, 1<<5 | 1<<6 | 1<<7},

 		{"*", 1, 3, 1<<1 | 1<<2 | 1<<3 | starBit},
 		{"*/2", 1, 3, 1<<1 | 1<<3 | starBit},
 	}

 	for _, c := range ranges {
 		actual := getRange(c.expr, bounds{c.min, c.max, nil})
 		if actual != c.expected {
 			t.Errorf("%s => (expected) %d != %d (actual)", c.expr, c.expected, actual)
 		}
 	}
 }

 func TestField(t *testing.T) {
 	fields := []struct {
 		expr     string
 		min, max uint
 		expected uint64
 	}{
 		{"5", 1, 7, 1 << 5},
 		{"5,6", 1, 7, 1<<5 | 1<<6},
 		{"5,6,7", 1, 7, 1<<5 | 1<<6 | 1<<7},
 		{"1,5-7/2,3", 1, 7, 1<<1 | 1<<5 | 1<<7 | 1<<3},
 	}

 	for _, c := range fields {
 		actual := getField(c.expr, bounds{c.min, c.max, nil})
 		if actual != c.expected {
 			t.Errorf("%s => (expected) %d != %d (actual)", c.expr, c.expected, actual)
 		}
 	}
 }

 func TestBits(t *testing.T) {
 	allBits := []struct {
 		r        bounds
 		expected uint64
 	}{
 		{minutes, 0xfffffffffffffff}, // 0-59: 60 ones
 		{hours, 0xffffff},            // 0-23: 24 ones
 		{dom, 0xfffffffe},            // 1-31: 31 ones, 1 zero
 		{months, 0x1ffe},             // 1-12: 12 ones, 1 zero
 		{dow, 0x7f},                  // 0-6: 7 ones
 	}

 	for _, c := range allBits {
 		actual := all(c.r) // all() adds the starBit, so compensate for that..
 		if c.expected|starBit != actual {
 			t.Errorf("%d-%d/%d => (expected) %b != %b (actual)",
 				c.r.min, c.r.max, 1, c.expected|starBit, actual)
 		}
 	}

 	bits := []struct {
 		min, max, step uint
 		expected       uint64
 	}{

 		{0, 0, 1, 0x1},
 		{1, 1, 1, 0x2},
 		{1, 5, 2, 0x2a}, // 101010
 		{1, 4, 2, 0xa},  // 1010
 	}

 	for _, c := range bits {
 		actual := getBits(c.min, c.max, c.step)
 		if c.expected != actual {
 			t.Errorf("%d-%d/%d => (expected) %b != %b (actual)",
 				c.min, c.max, c.step, c.expected, actual)
 		}
 	}
 }

 func TestSpecSchedule(t *testing.T) {
 	entries := []struct {
 		expr     string
 		expected Schedule
 	}{
 		{"* 5 * * * *", &SpecSchedule{all(seconds), 1 << 5, all(hours), all(dom), all(months), all(dow)}},
 		{"@every 5m", ConstantDelaySchedule{time.Duration(5) * time.Minute}},
 	}

 	for _, c := range entries {
 		actual, err := Parse(c.expr)
 		if err != nil {
 			t.Error(err)
 		}
 		if !reflect.DeepEqual(actual, c.expected) {
 			t.Errorf("%s => (expected) %v != %v (actual)", c.expr, c.expected, actual)
 		}
 	}
 }
--- a/modules/cron/spec.go
+++ b/modules/cron/spec.go
@@ -1,161 +0,0 @@
 package cron

 import (
 	"time"
 )

 // SpecSchedule specifies a duty cycle (to the second granularity), based on a
 // traditional crontab specification. It is computed initially and stored as bit sets.
 type SpecSchedule struct {
 	Second, Minute, Hour, Dom, Month, Dow uint64
 }

 // bounds provides a range of acceptable values (plus a map of name to value).
 type bounds struct {
 	min, max uint
 	names    map[string]uint
 }

 // The bounds for each field.
 var (
 	seconds = bounds{0, 59, nil}
 	minutes = bounds{0, 59, nil}
 	hours   = bounds{0, 23, nil}
 	dom     = bounds{1, 31, nil}
 	months  = bounds{1, 12, map[string]uint{
 		"jan": 1,
 		"feb": 2,
 		"mar": 3,
 		"apr": 4,
 		"may": 5,
 		"jun": 6,
 		"jul": 7,
 		"aug": 8,
 		"sep": 9,
 		"oct": 10,
 		"nov": 11,
 		"dec": 12,
 	}}
 	dow = bounds{0, 6, map[string]uint{
 		"sun": 0,
 		"mon": 1,
 		"tue": 2,
 		"wed": 3,
 		"thu": 4,
 		"fri": 5,
 		"sat": 6,
 	}}
 )

 const (
 	// Set the top bit if a star was included in the expression.
 	starBit = 1 << 63
 )

 // Next returns the next time this schedule is activated, greater than the given
 // time.  If no time can be found to satisfy the schedule, return the zero time.
 func (s *SpecSchedule) Next(t time.Time) time.Time {
 	// General approach:
 	// For Month, Day, Hour, Minute, Second:
 	// Check if the time value matches.  If yes, continue to the next field.
 	// If the field doesn't match the schedule, then increment the field until it matches.
 	// While incrementing the field, a wrap-around brings it back to the beginning
 	// of the field list (since it is necessary to re-verify previous field
 	// values)

 	// Start at the earliest possible time (the upcoming second).
 	t = t.Add(1*time.Second - time.Duration(t.Nanosecond())*time.Nanosecond)

 	// This flag indicates whether a field has been incremented.
 	added := false

 	// If no time is found within five years, return zero.
 	yearLimit := t.Year() + 5

 WRAP:
 	if t.Year() > yearLimit {
 		return time.Time{}
 	}

 	// Find the first applicable month.
 	// If it's this month, then do nothing.
 	for 1<<uint(t.Month())&s.Month == 0 {
 		// If we have to add a month, reset the other parts to 0.
 		if !added {
 			added = true
 			// Otherwise, set the date at the beginning (since the current time is irrelevant).
 			t = time.Date(t.Year(), t.Month(), 1, 0, 0, 0, 0, t.Location())
 		}
 		t = t.AddDate(0, 1, 0)

 		// Wrapped around.
 		if t.Month() == time.January {
 			goto WRAP
 		}
 	}

 	// Now get a day in that month.
 	for !dayMatches(s, t) {
 		if !added {
 			added = true
 			t = time.Date(t.Year(), t.Month(), t.Day(), 0, 0, 0, 0, t.Location())
 		}
 		t = t.AddDate(0, 0, 1)

 		if t.Day() == 1 {
 			goto WRAP
 		}
 	}

 	for 1<<uint(t.Hour())&s.Hour == 0 {
 		if !added {
 			added = true
 			t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), 0, 0, 0, t.Location())
 		}
 		t = t.Add(1 * time.Hour)

 		if t.Hour() == 0 {
 			goto WRAP
 		}
 	}

 	for 1<<uint(t.Minute())&s.Minute == 0 {
 		if !added {
 			added = true
 			t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), 0, 0, t.Location())
 		}
 		t = t.Add(1 * time.Minute)

 		if t.Minute() == 0 {
 			goto WRAP
 		}
 	}

 	for 1<<uint(t.Second())&s.Second == 0 {
 		if !added {
 			added = true
 			t = time.Date(t.Year(), t.Month(), t.Day(), t.Hour(), t.Minute(), t.Second(), 0, t.Location())
 		}
 		t = t.Add(1 * time.Second)

 		if t.Second() == 0 {
 			goto WRAP
 		}
 	}

 	return t
 }

 // dayMatches returns true if the schedule's day-of-week and day-of-month
 // restrictions are satisfied by the given time.
 func dayMatches(s *SpecSchedule, t time.Time) bool {
 	var (
 		domMatch bool = 1<<uint(t.Day())&s.Dom > 0
 		dowMatch bool = 1<<uint(t.Weekday())&s.Dow > 0
 	)

 	if s.Dom&starBit > 0 || s.Dow&starBit > 0 {
 		return domMatch && dowMatch
 	}
 	return domMatch || dowMatch
 }
--- a/modules/cron/spec_test.go
+++ b/modules/cron/spec_test.go
@@ -1,173 +0,0 @@
 package cron

 import (
 	"testing"
 	"time"
 )

 func TestActivation(t *testing.T) {
 	tests := []struct {
 		time, spec string
 		expected   bool
 	}{
 		// Every fifteen minutes.
 		{"Mon Jul 9 15:00 2012", "0 0/15 * * *", true},
 		{"Mon Jul 9 15:45 2012", "0 0/15 * * *", true},
 		{"Mon Jul 9 15:40 2012", "0 0/15 * * *", false},

 		// Every fifteen minutes, starting at 5 minutes.
 		{"Mon Jul 9 15:05 2012", "0 5/15 * * *", true},
 		{"Mon Jul 9 15:20 2012", "0 5/15 * * *", true},
 		{"Mon Jul 9 15:50 2012", "0 5/15 * * *", true},

 		// Named months
 		{"Sun Jul 15 15:00 2012", "0 0/15 * * Jul", true},
 		{"Sun Jul 15 15:00 2012", "0 0/15 * * Jun", false},

 		// Everything set.
 		{"Sun Jul 15 08:30 2012", "0 30 08 ? Jul Sun", true},
 		{"Sun Jul 15 08:30 2012", "0 30 08 15 Jul ?", true},
 		{"Mon Jul 16 08:30 2012", "0 30 08 ? Jul Sun", false},
 		{"Mon Jul 16 08:30 2012", "0 30 08 15 Jul ?", false},

 		// Predefined schedules
 		{"Mon Jul 9 15:00 2012", "@hourly", true},
 		{"Mon Jul 9 15:04 2012", "@hourly", false},
 		{"Mon Jul 9 15:00 2012", "@daily", false},
 		{"Mon Jul 9 00:00 2012", "@daily", true},
 		{"Mon Jul 9 00:00 2012", "@weekly", false},
 		{"Sun Jul 8 00:00 2012", "@weekly", true},
 		{"Sun Jul 8 01:00 2012", "@weekly", false},
 		{"Sun Jul 8 00:00 2012", "@monthly", false},
 		{"Sun Jul 1 00:00 2012", "@monthly", true},

 		// Test interaction of DOW and DOM.
 		// If both are specified, then only one needs to match.
 		{"Sun Jul 15 00:00 2012", "0 * * 1,15 * Sun", true},
 		{"Fri Jun 15 00:00 2012", "0 * * 1,15 * Sun", true},
 		{"Wed Aug 1 00:00 2012", "0 * * 1,15 * Sun", true},

 		// However, if one has a star, then both need to match.
 		{"Sun Jul 15 00:00 2012", "0 * * * * Mon", false},
 		{"Sun Jul 15 00:00 2012", "0 * * */10 * Sun", false},
 		{"Mon Jul 9 00:00 2012", "0 * * 1,15 * *", false},
 		{"Sun Jul 15 00:00 2012", "0 * * 1,15 * *", true},
 		{"Sun Jul 15 00:00 2012", "0 * * */2 * Sun", true},
 	}

 	for _, test := range tests {
 		sched, err := Parse(test.spec)
 		if err != nil {
 			t.Error(err)
 			continue
 		}
 		actual := sched.Next(getTime(test.time).Add(-1 * time.Second))
 		expected := getTime(test.time)
 		if test.expected && expected != actual || !test.expected && expected == actual {
 			t.Errorf("Fail evaluating %s on %s: (expected) %s != %s (actual)",
 				test.spec, test.time, expected, actual)
 		}
 	}
 }

 func TestNext(t *testing.T) {
 	runs := []struct {
 		time, spec string
 		expected   string
 	}{
 		// Simple cases
 		{"Mon Jul 9 14:45 2012", "0 0/15 * * *", "Mon Jul 9 15:00 2012"},
 		{"Mon Jul 9 14:59 2012", "0 0/15 * * *", "Mon Jul 9 15:00 2012"},
 		{"Mon Jul 9 14:59:59 2012", "0 0/15 * * *", "Mon Jul 9 15:00 2012"},

 		// Wrap around hours
 		{"Mon Jul 9 15:45 2012", "0 20-35/15 * * *", "Mon Jul 9 16:20 2012"},

 		// Wrap around days
 		{"Mon Jul 9 23:46 2012", "0 */15 * * *", "Tue Jul 10 00:00 2012"},
 		{"Mon Jul 9 23:45 2012", "0 20-35/15 * * *", "Tue Jul 10 00:20 2012"},
 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * * *", "Tue Jul 10 00:20:15 2012"},
 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 1/2 * *", "Tue Jul 10 01:20:15 2012"},
 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 10-12 * *", "Tue Jul 10 10:20:15 2012"},

 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 1/2 */2 * *", "Thu Jul 11 01:20:15 2012"},
 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * 9-20 * *", "Wed Jul 10 00:20:15 2012"},
 		{"Mon Jul 9 23:35:51 2012", "15/35 20-35/15 * 9-20 Jul *", "Wed Jul 10 00:20:15 2012"},

 		// Wrap around months
 		{"Mon Jul 9 23:35 2012", "0 0 0 9 Apr-Oct ?", "Thu Aug 9 00:00 2012"},
 		{"Mon Jul 9 23:35 2012", "0 0 0 */5 Apr,Aug,Oct Mon", "Mon Aug 6 00:00 2012"},
 		{"Mon Jul 9 23:35 2012", "0 0 0 */5 Oct Mon", "Mon Oct 1 00:00 2012"},

 		// Wrap around years
 		{"Mon Jul 9 23:35 2012", "0 0 0 * Feb Mon", "Mon Feb 4 00:00 2013"},
 		{"Mon Jul 9 23:35 2012", "0 0 0 * Feb Mon/2", "Fri Feb 1 00:00 2013"},

 		// Wrap around minute, hour, day, month, and year
 		{"Mon Dec 31 23:59:45 2012", "0 * * * * *", "Tue Jan 1 00:00:00 2013"},

 		// Leap year
 		{"Mon Jul 9 23:35 2012", "0 0 0 29 Feb ?", "Mon Feb 29 00:00 2016"},

 		// Daylight savings time EST -> EDT
 		{"2012-03-11T00:00:00-0500", "0 30 2 11 Mar ?", "2013-03-11T02:30:00-0400"},

 		// Daylight savings time EDT -> EST
 		{"2012-11-04T00:00:00-0400", "0 30 2 04 Nov ?", "2012-11-04T02:30:00-0500"},
 		{"2012-11-04T01:45:00-0400", "0 30 1 04 Nov ?", "2012-11-04T01:30:00-0500"},

 		// Unsatisfiable
 		{"Mon Jul 9 23:35 2012", "0 0 0 30 Feb ?", ""},
 		{"Mon Jul 9 23:35 2012", "0 0 0 31 Apr ?", ""},
 	}

 	for _, c := range runs {
 		sched, err := Parse(c.spec)
 		if err != nil {
 			t.Error(err)
 			continue
 		}
 		actual := sched.Next(getTime(c.time))
 		expected := getTime(c.expected)
 		if !actual.Equal(expected) {
 			t.Errorf("%s, \"%s\": (expected) %v != %v (actual)", c.time, c.spec, expected, actual)
 		}
 	}
 }

 func TestErrors(t *testing.T) {
 	invalidSpecs := []string{
 		"xyz",
 		"60 0 * * *",
 		"0 60 * * *",
 		"0 0 * * XYZ",
 	}
 	for _, spec := range invalidSpecs {
 		_, err := Parse(spec)
 		if err == nil {
 			t.Error("expected an error parsing: ", spec)
 		}
 	}
 }

 func getTime(value string) time.Time {
 	if value == "" {
 		return time.Time{}
 	}
 	t, err := time.Parse("Mon Jan 2 15:04 2006", value)
 	if err != nil {
 		t, err = time.Parse("Mon Jan 2 15:04:05 2006", value)
 		if err != nil {
 			t, err = time.Parse("2006-01-02T15:04:05-0700", value)
 			if err != nil {
 				panic(err)
 			}
 			// Daylight savings time tests require location
 			if ny, err := time.LoadLocation("America/New_York"); err == nil {
 				t = t.In(ny)
 			}
 		}
 	}

 	return t
 }
--- a/routers/admin/admin.go
+++ b/routers/admin/admin.go
@@ -14,8 +14,8 @@ import (
 	"gopkg.in/macaron.v1"

 	"github.com/gogits/gogs/models"
 	"github.com/gogits/gogs/models/cron"
 	"github.com/gogits/gogs/modules/base"
 	"github.com/gogits/gogs/modules/cron"
 	"github.com/gogits/gogs/modules/middleware"
 	"github.com/gogits/gogs/modules/process"
 	"github.com/gogits/gogs/modules/setting"
--- a/routers/install.go
+++ b/routers/install.go
@@ -20,9 +20,9 @@ import (
 	"github.com/gogits/git-module"

 	"github.com/gogits/gogs/models"
 	"github.com/gogits/gogs/models/cron"
 	"github.com/gogits/gogs/modules/auth"
 	"github.com/gogits/gogs/modules/base"
 	"github.com/gogits/gogs/modules/cron"
 	"github.com/gogits/gogs/modules/log"
 	"github.com/gogits/gogs/modules/mailer"
 	"github.com/gogits/gogs/modules/middleware"