mirror of
https://github.com/zrepl/zrepl.git
synced 2024-11-30 20:35:23 +01:00
10a14a8c50
package trace:
- introduce the concept of tasks and spans, tracked as linked list within ctx
- see package-level docs for an overview of the concepts
- **main feature 1**: unique stack of task and span IDs
- makes it easy to follow a series of log entries in concurrent code
- **main feature 2**: ability to produce a chrome://tracing-compatible trace file
- either via an env variable or a `zrepl pprof` subcommand
- this is not a CPU profile, we already have go pprof for that
- but it is very useful to visually inspect where the
replication / snapshotter / pruner spends its time
( fixes #307 )
usage in package daemon/logging:
- goal: every log entry should have a trace field with the ID stack from package trace
- make `logging.GetLogger(ctx, Subsys)` the authoritative `logger.Logger` factory function
- the context carries a linked list of injected fields which
`logging.GetLogger` adds to the logger it returns
- `logging.GetLogger` also uses package `trace` to get the
task-and-span-stack and injects it into the returned logger's fields
106 lines
2.5 KiB
Go
106 lines
2.5 KiB
Go
package daemon
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import (
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"context"
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"net"
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"net/http"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promhttp"
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"github.com/zrepl/zrepl/config"
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"github.com/zrepl/zrepl/daemon/job"
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"github.com/zrepl/zrepl/daemon/logging"
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"github.com/zrepl/zrepl/endpoint"
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"github.com/zrepl/zrepl/logger"
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"github.com/zrepl/zrepl/rpc/dataconn/frameconn"
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"github.com/zrepl/zrepl/util/tcpsock"
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"github.com/zrepl/zrepl/zfs"
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)
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type prometheusJob struct {
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listen string
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freeBind bool
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}
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func newPrometheusJobFromConfig(in *config.PrometheusMonitoring) (*prometheusJob, error) {
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if _, _, err := net.SplitHostPort(in.Listen); err != nil {
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return nil, err
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}
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return &prometheusJob{in.Listen, in.ListenFreeBind}, nil
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}
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var prom struct {
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taskLogEntries *prometheus.CounterVec
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}
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func init() {
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prom.taskLogEntries = prometheus.NewCounterVec(prometheus.CounterOpts{
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Namespace: "zrepl",
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Subsystem: "daemon",
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Name: "log_entries",
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Help: "number of log entries per job task and level",
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}, []string{"zrepl_job", "level"})
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prometheus.MustRegister(prom.taskLogEntries)
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}
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func (j *prometheusJob) Name() string { return jobNamePrometheus }
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func (j *prometheusJob) Status() *job.Status { return &job.Status{Type: job.TypeInternal} }
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func (j *prometheusJob) OwnedDatasetSubtreeRoot() (p *zfs.DatasetPath, ok bool) { return nil, false }
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func (j *prometheusJob) SenderConfig() *endpoint.SenderConfig { return nil }
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func (j *prometheusJob) RegisterMetrics(registerer prometheus.Registerer) {}
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func (j *prometheusJob) Run(ctx context.Context) {
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if err := zfs.PrometheusRegister(prometheus.DefaultRegisterer); err != nil {
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panic(err)
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}
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if err := frameconn.PrometheusRegister(prometheus.DefaultRegisterer); err != nil {
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panic(err)
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}
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log := job.GetLogger(ctx)
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l, err := tcpsock.Listen(j.listen, j.freeBind)
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if err != nil {
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log.WithError(err).Error("cannot listen")
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return
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}
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go func() {
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<-ctx.Done()
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l.Close()
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}()
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mux := http.NewServeMux()
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mux.Handle("/metrics", promhttp.Handler())
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err = http.Serve(l, mux)
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if err != nil && ctx.Err() == nil {
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log.WithError(err).Error("error while serving")
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}
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}
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type prometheusJobOutlet struct {
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}
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var _ logger.Outlet = prometheusJobOutlet{}
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func newPrometheusLogOutlet() prometheusJobOutlet {
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return prometheusJobOutlet{}
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}
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func (o prometheusJobOutlet) WriteEntry(entry logger.Entry) error {
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jobFieldVal, ok := entry.Fields[logging.JobField].(string)
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if !ok {
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jobFieldVal = "_nojobid"
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}
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prom.taskLogEntries.WithLabelValues(jobFieldVal, entry.Level.String()).Inc()
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return nil
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}
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