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package server
import (
"context"
"fmt"
"strings"
"time"
"github.com/mimecast/dtail/internal/clients"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/dlog"
"github.com/mimecast/dtail/internal/omode"
gossh "golang.org/x/crypto/ssh"
)
type continuousClient interface {
Start(context.Context, <-chan string) int
}
type continuous struct {
cfg config.RuntimeConfig
newMaprClient func(config.Args, clients.MaprClientMode) (continuousClient, error)
dayChangeWatcher func(context.Context) bool
retryInterval time.Duration
now func() time.Time
newTicker func(time.Duration) (<-chan time.Time, func())
}
func newContinuous(cfg config.RuntimeConfig) *continuous {
c := &continuous{cfg: cfg}
c.retryInterval = time.Minute
c.now = time.Now
c.newTicker = func(d time.Duration) (<-chan time.Time, func()) {
ticker := time.NewTicker(d)
return ticker.C, ticker.Stop
}
c.newMaprClient = func(args config.Args, mode clients.MaprClientMode) (continuousClient, error) {
return clients.NewMaprClient(args, mode)
}
c.dayChangeWatcher = c.waitForDayChange
return c
}
func (c *continuous) start(ctx context.Context) {
dlog.Server.Info("Starting continuous job runner after 2s")
time.Sleep(time.Second * 2)
c.runJobs(ctx)
}
func (c *continuous) runJobs(ctx context.Context) {
for i := range c.cfg.Server.Continuous {
job := &c.cfg.Server.Continuous[i]
if !job.Enable {
dlog.Server.Debug(job.Name, "Not running job as not enabled")
continue
}
go func(job *config.Continuous) {
c.runJob(ctx, job)
retryTicker := time.NewTicker(c.retryInterval)
defer retryTicker.Stop()
for {
select {
// Retry after the configured interval.
case <-retryTicker.C:
c.runJob(ctx, job)
case <-ctx.Done():
return
}
}
}(job)
}
}
func (c *continuous) runJob(ctx context.Context, job *config.Continuous) {
dlog.Server.Debug(job.Name, "Processing job")
files := fillDates(job.Files)
outfile := fillDates(job.Outfile)
servers := strings.Join(job.Servers, ",")
if servers == "" {
servers = c.cfg.Server.SSHBindAddress
}
args := config.Args{
ConnectionsPerCPU: config.DefaultConnectionsPerCPU,
Discovery: job.Discovery,
ServersStr: servers,
What: files,
Mode: omode.TailClient,
UserName: config.ContinuousUser,
}
args.SSHAuthMethods = append(args.SSHAuthMethods, gossh.Password(job.Name))
args.QueryStr = fmt.Sprintf("%s outfile %s", job.Query, outfile)
client, err := c.newMaprClient(args, clients.NonCumulativeMode)
if err != nil {
dlog.Server.Error(fmt.Sprintf("Unable to create job %s", job.Name), err)
return
}
jobCtx, cancel := context.WithCancel(ctx)
defer cancel()
if job.RestartOnDayChange {
go func() {
if c.dayChangeWatcher(jobCtx) {
dlog.Server.Info(fmt.Sprintf("Canceling job %s due to day change", job.Name))
cancel()
}
}()
}
dlog.Server.Info(fmt.Sprintf("Starting job %s", job.Name))
status := client.Start(jobCtx, make(chan string))
logMessage := fmt.Sprintf("Job exited with status %d", status)
if status != 0 {
dlog.Server.Warn(logMessage)
return
}
dlog.Server.Info(logMessage)
}
func (c *continuous) waitForDayChange(ctx context.Context) bool {
startTime := c.now()
tickCh, stop := c.newTicker(time.Second)
defer stop()
for {
select {
case <-tickCh:
if !sameCalendarDay(c.now(), startTime) {
return true
}
case <-ctx.Done():
return false
}
}
}
func sameCalendarDay(a, b time.Time) bool {
ay, am, ad := a.Date()
by, bm, bd := b.Date()
return ay == by && am == bm && ad == bd
}
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