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logs.go
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logs.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package logs
import (
"context"
"errors"
"fmt"
"io"
"os"
"github.com/MakeNowJust/heredoc"
"github.com/spf13/cobra"
machineapi "kraftkit.sh/api/machine/v1alpha1"
"kraftkit.sh/cmdfactory"
"kraftkit.sh/config"
"kraftkit.sh/iostreams"
"kraftkit.sh/log"
mplatform "kraftkit.sh/machine/platform"
)
type LogOptions struct {
Follow bool `long:"follow" short:"f" usage:"Follow log output"`
Platform string `noattribute:"true"`
Prefix string `long:"prefix" usage:"Prefix each log line with the given string"`
PrefixName bool `long:"prefix-name" usage:"Prefix each log line with the machine name"`
}
func NewCmd() *cobra.Command {
cmd, err := cmdfactory.New(&LogOptions{}, cobra.Command{
Short: "Fetch the logs of a unikernel.",
Use: "logs [FLAGS] MACHINE",
Args: cobra.ExactArgs(1),
Aliases: []string{"log"},
Long: heredoc.Doc(`
Fetch the logs of a unikernel.
`),
Example: heredoc.Doc(`
# Fetch the logs of a unikernel
$ kraft logs my-machine
# Fetch the logs of a unikernel and follow the output
$ kraft logs --follow my-machine
# Fetch the logs of a unikernel and prefix each line with the machine name
$ kraft logs --prefix-name
# Fetch the logs of a unikernel and prefix each line with the given string
$ kraft logs --prefix "log: "
`),
Annotations: map[string]string{
cmdfactory.AnnotationHelpGroup: "run",
},
})
if err != nil {
panic(err)
}
cmd.Flags().VarP(
cmdfactory.NewEnumFlag[mplatform.Platform](
mplatform.Platforms(),
mplatform.Platform("auto"),
),
"plat",
"p",
"Set the platform virtual machine monitor driver. Set to 'auto' to detect the guest's platform and 'host' to use the host platform.",
)
return cmd
}
func (opts *LogOptions) Pre(cmd *cobra.Command, _ []string) error {
opts.Platform = cmd.Flag("plat").Value.String()
return nil
}
func (opts *LogOptions) Run(ctx context.Context, args []string) error {
var err error
platform := mplatform.PlatformUnknown
var controller machineapi.MachineService
if opts.Platform == "auto" {
controller, err = mplatform.NewMachineV1alpha1ServiceIterator(ctx)
} else {
if opts.Platform == "host" {
platform, _, err = mplatform.Detect(ctx)
if err != nil {
return err
}
} else {
var ok bool
platform, ok = mplatform.PlatformsByName()[opts.Platform]
if !ok {
return fmt.Errorf("unknown platform driver: %s", opts.Platform)
}
}
strategy, ok := mplatform.Strategies()[platform]
if !ok {
return fmt.Errorf("unsupported platform driver: %s (contributions welcome!)", platform.String())
}
controller, err = strategy.NewMachineV1alpha1(ctx)
}
if err != nil {
return err
}
machines, err := controller.List(ctx, &machineapi.MachineList{})
if err != nil {
return err
}
var machine *machineapi.Machine
for _, candidate := range machines.Items {
if args[0] == candidate.Name {
machine = &candidate
break
} else if string(candidate.UID) == args[0] {
machine = &candidate
break
}
}
if machine == nil {
return fmt.Errorf("could not find instance %s", args[0])
}
if opts.PrefixName && opts.Prefix == "" {
opts.Prefix = machine.Name
}
if opts.Follow && machine.Status.State == machineapi.MachineStateRunning {
consumer, err := NewColorfulConsumer(iostreams.G(ctx), !config.G[config.KraftKit](ctx).NoColor, opts.Prefix)
if err != nil {
return err
}
if err = FollowLogs(ctx, machine, controller, consumer); err != nil {
return err
}
} else {
fd, err := os.Open(machine.Status.LogFile)
if err != nil {
return err
}
if _, err := io.Copy(iostreams.G(ctx).Out, fd); err != nil {
return err
}
}
return nil
}
// FollowLogs tracks the logs generated by a machine and prints them to the context out stream.
func FollowLogs(ctx context.Context, machine *machineapi.Machine, controller machineapi.MachineService, consumer LogConsumer) error {
ctx, cancel := context.WithCancel(ctx)
var exitErr error
var eof bool
go func() {
events, errs, err := controller.Watch(ctx, machine)
if err != nil {
cancel()
if eof {
return
}
exitErr = fmt.Errorf("listening to machine events: %w", err)
return
}
loop:
for {
// Wait on either channel
select {
case status := <-events:
switch status.Status.State {
case machineapi.MachineStateErrored:
exitErr = fmt.Errorf("machine fatally exited")
cancel()
break loop
case machineapi.MachineStateExited, machineapi.MachineStateFailed:
cancel()
break loop
}
case err := <-errs:
log.G(ctx).Errorf("received event error: %v", err)
exitErr = err
cancel()
break loop
case <-ctx.Done():
break loop
}
}
}()
logs, errs, err := controller.Logs(ctx, machine)
if err != nil {
cancel()
return err
}
loop:
for {
// Wait on either channel
select {
case line := <-logs:
if err := consumer.Consume(line); err != nil {
log.G(ctx).Errorf("could not consume log line: %v", err)
return err
}
case err := <-errs:
eof = true
if !errors.Is(err, io.EOF) {
log.G(ctx).Errorf("received event error: %v", err)
return err
}
case <-ctx.Done():
break loop
}
}
return exitErr
}