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config.go
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config.go
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package machine
import (
"context"
"encoding/json"
"fmt"
"regexp"
"strings"
"github.com/google/go-cmp/cmp"
"github.com/superfly/flyctl/api"
"github.com/superfly/flyctl/helpers"
"github.com/superfly/flyctl/internal/prompt"
"github.com/superfly/flyctl/iostreams"
)
type ErrNoConfigChangesFound struct{}
func (e *ErrNoConfigChangesFound) Error() string {
return "no config changes found"
}
func ConfirmConfigChanges(ctx context.Context, machine *api.Machine, targetConfig api.MachineConfig, customPrompt string) (bool, error) {
var (
io = iostreams.FromContext(ctx)
colorize = io.ColorScheme()
)
diff := configCompare(ctx, *machine.Config, targetConfig)
if diff == "" {
return false, &ErrNoConfigChangesFound{}
}
if customPrompt != "" {
fmt.Fprintf(io.Out, customPrompt)
} else {
fmt.Fprintf(io.Out, "Configuration changes to be applied to machine: %s (%s)\n", colorize.Bold(machine.ID), colorize.Bold(machine.Name))
}
fmt.Fprintf(io.Out, "\n%s\n", diff)
const msg = "Apply changes?"
switch confirmed, err := prompt.Confirmf(ctx, msg); {
case err == nil:
if !confirmed {
return false, nil
}
case prompt.IsNonInteractive(err):
return false, prompt.NonInteractiveError("auto-confirm flag must be specified when not running interactively")
default:
return false, err
}
return true, nil
}
// CloneConfig deep-copies a MachineConfig.
// If CloneConfig is called on a nil config, nil is returned.
func CloneConfig(orig *api.MachineConfig) *api.MachineConfig {
if orig == nil {
return nil
}
return helpers.Clone(orig)
}
var cmpOptions = cmp.Options{
cmp.FilterValues(
func(x, y []byte) bool { return json.Valid(x) && json.Valid(y) },
cmp.Transformer("parseJSON",
func(in []byte) (out string) {
return string(in)
})),
}
func configCompare(ctx context.Context, original api.MachineConfig, new api.MachineConfig) string {
io := iostreams.FromContext(ctx)
colorize := io.ColorScheme()
origBytes, _ := json.MarshalIndent(original, "", " ")
newBytes, _ := json.MarshalIndent(new, "", " ")
if cmp.Equal(origBytes, newBytes, cmpOptions) {
return ""
}
diff := cmp.Diff(origBytes, newBytes, cmpOptions)
diffSlice := strings.Split(diff, "\n")
var str string
additionReg := regexp.MustCompile(`^\+.*`)
deletionReg := regexp.MustCompile(`^\-.*`)
// Highlight additions/deletions
for _, val := range diffSlice {
vB := []byte(val)
if additionReg.Match(vB) {
str += colorize.Green(val) + "\n"
} else if deletionReg.Match(vB) {
str += colorize.Red(val) + "\n"
} else {
str += val + "\n"
}
}
// Cleanup output
delim := "\"\"\""
rx := regexp.MustCompile(`(?s)` + regexp.QuoteMeta(delim) + `(.*?)` + regexp.QuoteMeta(delim))
match := rx.FindStringSubmatch(str)
if len(match) > 0 {
return strings.Trim(match[1], "\n")
}
// We know the objects are different, if we can't cleanup return the best we have got
return str
}