add ilm forecast data collection, generalized parallel api calls

cmd/ilm_forecast.go

@@ -0,0 +1,71 @@
+/*
+Copyright © 2026 Thomas von Dein
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+package cmd
+
+import (
+	"context"
+	"errors"
+	"slices"
+
+	"codeberg.org/scip/esctl/pkg/cfg"
+	"codeberg.org/scip/esctl/pkg/es"
+
+	"github.com/urfave/cli/v3"
+)
+
+func IlmForecast(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:  "forecast",
+		Usage: "calculate index phase movements",
+
+		Commands: []*cli.Command{
+			IlmForecastList(conf),
+		},
+	}
+}
+
+func IlmForecastList(conf *cfg.Config) *cli.Command {
+	return &cli.Command{
+		Name:    "list",
+		Aliases: []string{"ls"},
+		Usage:   "list index rollover config",
+
+		Flags: []cli.Flag{
+			&cli.StringFlag{
+				Name:        "from-phase",
+				Usage:       "which ilm phase to forecast from",
+				Destination: &conf.Ilm.FromPhase,
+				Aliases:     []string{"f"},
+			},
+			&cli.StringFlag{
+				Name:        "within",
+				Usage:       "duration withing which to forecast",
+				Destination: &conf.Ilm.Within,
+				Aliases:     []string{"w"},
+			},
+		},
+
+		Action: func(ctx context.Context, cmd *cli.Command) error {
+			valid := []string{"hot", "warm", "cold", "frozen"}
+			if !slices.Contains(valid, conf.Ilm.FromPhase) {
+				return errors.New("invalid from phase, allowed: hot, warm, cold, frozen")
+			}
+
+			return es.IlmForecastList(conf)
+		},
+	}
+}