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package cli
import (
"context"
"net/http"
_ "net/http/pprof" // Register pprof handlers when runtime pprof endpoint is enabled.
"sync"
"github.com/mimecast/dtail/internal/io/dlog"
"github.com/mimecast/dtail/internal/profiling"
"github.com/mimecast/dtail/internal/source"
)
// ClientRuntime owns common client command runtime components.
type ClientRuntime struct {
ctx context.Context
cancel context.CancelFunc
wg sync.WaitGroup
profiler *profiling.Profiler
profileEnabled bool
}
// NewClientRuntime starts logging and profiling for a client command.
func NewClientRuntime(parent context.Context, profileFlags profiling.Flags, profileName string) *ClientRuntime {
if parent == nil {
parent = context.Background()
}
ctx, cancel := context.WithCancel(parent)
runtime := &ClientRuntime{
ctx: ctx,
cancel: cancel,
profiler: profiling.NewProfiler(profileFlags.ToConfig(profileName)),
profileEnabled: profileFlags.Enabled(),
}
runtime.wg.Add(1)
dlog.Start(ctx, &runtime.wg, source.Client)
return runtime
}
// Context returns the runtime context.
func (r *ClientRuntime) Context() context.Context {
return r.ctx
}
// Cancel cancels the runtime context.
func (r *ClientRuntime) Cancel() {
r.cancel()
}
// StartPProf starts the pprof server if an address is provided.
func (r *ClientRuntime) StartPProf(address string) {
if address == "" {
return
}
dlog.Client.Info("Starting PProf", address)
go func() {
if err := http.ListenAndServe(address, nil); err != nil {
dlog.Client.Error("PProf server exited", err)
}
}()
}
// LogStartupMetrics logs startup profiling metrics when enabled.
func (r *ClientRuntime) LogStartupMetrics() {
if r.profileEnabled {
r.profiler.LogMetrics("startup")
}
}
// LogShutdownMetrics logs shutdown profiling metrics when enabled.
func (r *ClientRuntime) LogShutdownMetrics() {
if r.profileEnabled {
r.profiler.LogMetrics("shutdown")
}
}
// Stop stops profiling and logging runtime goroutines.
func (r *ClientRuntime) Stop() {
r.profiler.Stop()
r.cancel()
r.wg.Wait()
}
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