fix(launcher): influxd inspect commands now start instantly

Lazily initialize flux, which increases startup time considerably

cmd/influxd/launcher/launcher.go

@@ -46,6 +46,7 @@ import (
 	"github.com/influxdata/influxdb/v2/pkger"
 	infprom "github.com/influxdata/influxdb/v2/prometheus"
 	"github.com/influxdata/influxdb/v2/query"
+	"github.com/influxdata/influxdb/v2/query/builtinlazy"
 	"github.com/influxdata/influxdb/v2/query/control"
 	"github.com/influxdata/influxdb/v2/query/fluxlang"
 	"github.com/influxdata/influxdb/v2/query/stdlib/influxdata/influxdb"
@@ -132,6 +133,8 @@ func cmdRunE(ctx context.Context, l *Launcher) func() error {
 		// exit with SIGINT and SIGTERM
 		ctx = signals.WithStandardSignals(ctx)
 
+		builtinlazy.Initialize()
+
 		if err := l.run(ctx); err != nil {
 			return err
 		} else if !l.Running() {

cmd/influxd/main.go

@@ -10,7 +10,6 @@ import (
 	"github.com/influxdata/flux"
 	"github.com/influxdata/influxdb/v2"
 	"github.com/influxdata/influxdb/v2/cmd/influxd/launcher"
-	_ "github.com/influxdata/influxdb/v2/query/builtin"
 	_ "github.com/influxdata/influxdb/v2/v1/tsdb/engine/tsm1"
 	_ "github.com/influxdata/influxdb/v2/v1/tsdb/index/tsi1"
 	"github.com/spf13/cobra"

query/builtinlazy/builtin.go

@@ -0,0 +1,20 @@
+package builtinlazy
+
+import (
+	"sync"
+
+	"github.com/influxdata/flux"
+	_ "github.com/influxdata/flux/stdlib"              // Import the stdlib
+	_ "github.com/influxdata/influxdb/v2/query/stdlib" // Import the stdlib
+)
+
+var once sync.Once
+
+// Initialize ensures all Flux builtins are configured and should be called
+// prior to using the Flux runtime. Initialize is safe to call concurrently
+// and is idempotent.
+func Initialize() {
+	once.Do(func() {
+		flux.FinalizeBuiltIns()
+	})
+}