refactor(cli): move cmd/uncloud to cmd/uc, change the artifact name uncloud_* -> uc_*

cmd/uc/machine/logs.go

@@ -0,0 +1,136 @@
+package machine
+
+import (
+	"context"
+	"fmt"
+	"slices"
+	"strings"
+
+	"github.com/psviderski/uncloud/internal/cli"
+	"github.com/psviderski/uncloud/internal/cli/completion"
+	"github.com/psviderski/uncloud/internal/cli/logs"
+	"github.com/psviderski/uncloud/pkg/api"
+	"github.com/psviderski/uncloud/pkg/client"
+	"github.com/spf13/cobra"
+)
+
+func NewLogsCommand() *cobra.Command {
+	var options logs.Options
+
+	cmd := &cobra.Command{
+		Use:     "logs [SERVICE...]",
+		Aliases: []string{"log"},
+		Short:   "View system service logs.",
+		Long: `View logs from the specified system service(s) across all machines in the cluster.
+Use -m to restrict to specific machines.
+
+Supported services:
+  corrosion  the Corrosion distributed state store
+  docker     the Docker daemon
+  uncloud    the Uncloud daemon
+
+If no services are specified, streams logs from the uncloud service.`,
+		Example: `  # View recent logs for the uncloud service.
+  uc machine logs
+  uc machine logs uncloud
+
+  # Stream logs in real-time (follow mode).
+  uc machine logs -f uncloud
+
+  # View logs from multiple services.
+  uc machine logs uncloud docker corrosion
+
+  # Show last 20 lines per machine (default is 100).
+  uc machine logs -n 20 docker
+
+  # Show all logs without line limit.
+  uc machine logs -n all docker
+
+  # View logs from a specific time range.
+  uc machine logs --since 3h --until 1h30m docker
+
+  # View logs only from specific machines.
+  uc machine logs -m machine1,machine2 uncloud corrosion`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+			return runLogs(cmd.Context(), uncli, args, options)
+		},
+	}
+
+	cmd.Flags().AddFlagSet(logs.Flags(&options))
+	completion.MachinesFlag(cmd)
+
+	return cmd
+}
+
+func runLogs(ctx context.Context, uncli *cli.CLI, services []string, opts logs.Options) error {
+	if len(services) == 0 {
+		services = []string{api.SystemServiceUncloud}
+	}
+	for _, service := range services {
+		if !slices.Contains(api.SystemServices, service) {
+			return fmt.Errorf("invalid system service '%s'; valid services: %s",
+				service, strings.Join(api.SystemServices, ", "))
+		}
+	}
+
+	tail, err := logs.Tail(opts.Tail)
+	if err != nil {
+		return err
+	}
+
+	c, err := uncli.ConnectCluster(ctx)
+	if err != nil {
+		return fmt.Errorf("connect to cluster: %w", err)
+	}
+	defer c.Close()
+
+	logsOpts := api.ServiceLogsOptions{
+		Follow:   opts.Follow,
+		Tail:     tail,
+		Since:    opts.Since,
+		Until:    opts.Until,
+		Machines: cli.ExpandCommaSeparatedValues(opts.Machines),
+	}
+
+	// Resolve machine records for the formatter's column width computation.
+	machines, err := c.ListMachines(ctx, &api.MachineFilter{
+		NamesOrIDs: logsOpts.Machines,
+	})
+	if err != nil {
+		return fmt.Errorf("list machines: %w", err)
+	}
+	machineNames := make([]string, 0, len(machines))
+	for _, m := range machines {
+		machineNames = append(machineNames, m.Machine.Name)
+	}
+
+	// Collect one log stream per service. MachineLogs merges across machines internally.
+	serviceStreams := make([]<-chan api.ServiceLogEntry, 0, len(services))
+	for _, service := range services {
+		ch, err := c.MachineLogs(ctx, service, logsOpts)
+		if err != nil {
+			return fmt.Errorf("stream logs for system service '%s': %w", service, err)
+		}
+		serviceStreams = append(serviceStreams, ch)
+	}
+
+	var stream <-chan api.ServiceLogEntry
+	if len(serviceStreams) == 1 {
+		stream = serviceStreams[0]
+	} else {
+		// Each MachineLogs stream already runs its own inner merger with stall detection,
+		// so the outer merger across services skips it to avoid duplicate warnings.
+		merger := client.NewLogMerger(serviceStreams, client.LogMergerOptions{})
+		stream = merger.Stream()
+	}
+
+	formatter := logs.NewFormatter(machineNames, services, opts.UTC)
+
+	// Print merged logs.
+	for entry := range stream {
+		formatter.PrintEntry(entry)
+	}
+
+	return nil
+}