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cmd.go
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cmd.go
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package checker
import (
"bytes"
"context"
"os/exec"
"github.com/gwos/tcg/connectors"
"github.com/gwos/tcg/connectors/nsca/parser"
"github.com/gwos/tcg/sdk/transit"
"github.com/gwos/tcg/services"
"github.com/gwos/tcg/tracing"
"github.com/robfig/cron/v3"
"github.com/rs/zerolog/log"
)
var (
extConfig = &ExtConfig{}
monitorConnection = &transit.MonitorConnection{
Extensions: extConfig,
}
chksum []byte
sch = cron.New(
cron.WithSeconds(),
cron.WithChain(
cron.Recover(cron.DefaultLogger),
cron.SkipIfStillRunning(cron.DefaultLogger),
),
)
)
// @title TCG API Documentation
// @version 1.0
// @host localhost:8099
// @BasePath /api/v1
func Run() {
transitService := services.GetTransitService()
transitService.RegisterConfigHandler(configHandler)
transitService.RegisterExitHandler(func() {
if sch != nil {
sch.Stop()
}
})
log.Info().Msg("waiting for configuration to be delivered ...")
if err := transitService.DemandConfig(); err != nil {
log.Err(err).Msg("could not demand config")
return
}
if err := connectors.Start(); err != nil {
log.Err(err).Msg("could not start connector")
return
}
/* return on quit signal */
<-transitService.Quit()
}
func configHandler(data []byte) {
log.Info().Msg("configuration received")
tExt, tMetProf := &ExtConfig{}, &transit.MetricsProfile{}
tMonConn := &transit.MonitorConnection{Extensions: tExt}
if err := connectors.UnmarshalConfig(data, tMetProf, tMonConn); err != nil {
log.Err(err).Msg("could not parse config")
return
}
if err := tExt.Validate(); err != nil {
log.Err(err).Msg("could not validate config")
return
}
extConfig, _, monitorConnection = tExt, tMetProf, tMonConn
monitorConnection.Extensions = extConfig
chk, err := connectors.Hashsum(extConfig)
if err != nil || !bytes.Equal(chksum, chk) {
restartScheduler(sch, extConfig.Schedule)
}
if err == nil {
chksum = chk
}
}
func restartScheduler(sch *cron.Cron, tasks []ScheduleTask) {
for _, entry := range sch.Entries() {
sch.Remove(entry.ID)
}
for _, task := range tasks {
_, _ = sch.AddFunc(task.Cron, taskHandler(task))
}
if len(sch.Entries()) > 0 {
sch.Start()
}
}
func taskHandler(task ScheduleTask) func() {
return func() {
cmd := exec.Command(task.Command[0], task.Command[1:]...)
cmd.Env = task.Environment
var (
handler func() ([]byte, error)
err error
res []byte
monitoredResources *[]transit.MonitoredResource
)
if task.CombinedOutput {
handler = cmd.CombinedOutput
} else {
handler = cmd.Output
}
ctx, span := tracing.StartTraceSpan(context.Background(), "connectors", "taskHandler")
defer func() {
tracing.EndTraceSpan(span,
tracing.TraceAttrError(err),
tracing.TraceAttrPayloadLen(res),
tracing.TraceAttrStr("task", task.String()),
)
}()
_, span2 := tracing.StartTraceSpan(ctx, "connectors", "command")
res, err = handler()
tracing.EndTraceSpan(span2,
tracing.TraceAttrError(err),
tracing.TraceAttrPayloadLen(res),
tracing.TraceAttrStrs("command", task.Command),
)
if err != nil {
log.Warn().Err(err).
Interface("task", task).
Bytes("res", res).
Msg("task failed")
return
}
log.Debug().
Interface("task", task).
Bytes("res", res).
Msg("task done")
_, span3 := tracing.StartTraceSpan(ctx, "connectors", "parse")
monitoredResources, err = parser.Parse(res, task.DataFormat)
tracing.EndTraceSpan(span3,
tracing.TraceAttrError(err),
tracing.TraceAttrPayloadLen(res),
)
if err != nil {
log.Warn().Err(err).
Interface("task", task).
Bytes("res", res).
Msg("could not parse metrics")
return
}
if err = connectors.SendMetrics(ctx, *monitoredResources, nil); err != nil {
log.Warn().Err(err).
Interface("task", task).
Bytes("res", res).
Msg("could not send metrics")
}
}
}