/
deleter.go
116 lines (102 loc) · 3.82 KB
/
deleter.go
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package deleter
import (
"fmt"
"strings"
"github.com/tektoncd/cli/pkg/cli"
"github.com/tektoncd/cli/pkg/names"
"go.uber.org/multierr"
)
// Deleter encapsulates behaviour around deleting resources and their relations.
// While actually performing a deletion is left to calling code, this helper
// type standardizes the sequencing, messaging and error handling related to
// deletions.
type Deleter struct {
errors []error
successfulDeletes []string
successfulRelatedDeletes []string
kind string
relatedKind string
delete func(string) error
listRelated func(string) ([]string, error)
deleteRelated func(string) error
}
// New returns a Deleter that will delete resources of kind with the given
// delete func when Execute is called.
func New(kind string, deleteFunc func(string) error) *Deleter {
return &Deleter{
kind: kind,
delete: deleteFunc,
}
}
// WithRelated tells this Deleter that it should also delete related resources
// when Execute is called. Related resources will be of given kind, the names of
// those resources must be provided by listFunc and each related resource will be
// passed to deleteFunc for deletion.
func (d *Deleter) WithRelated(kind string, listFunc func(string) ([]string, error), deleteFunc func(string) error) {
d.relatedKind = kind
d.listRelated = listFunc
d.deleteRelated = deleteFunc
}
// Delete performs the deletion of resources. Errors are printed to stderr of
// the passed in streams struct and are also aggregated for later access
// with d.Errors(). The names of successfully deleted resources are
// returned.
func (d *Deleter) Delete(resourceNames []string) []string {
for _, name := range resourceNames {
if err := d.delete(name); err != nil {
d.appendError(fmt.Errorf("failed to delete %s %q: %s", d.kind, name, err))
} else {
d.successfulDeletes = append(d.successfulDeletes, name)
}
}
return d.successfulDeletes
}
// DeleteRelated performs the deletion of resources related to d's kind. Errors are
// aggregated and can be accessed with d.Errors().
func (d *Deleter) DeleteRelated(resourceNames []string) {
if d.relatedKind != "" && d.listRelated != nil && d.deleteRelated != nil {
for _, name := range resourceNames {
d.deleteRelatedList(name)
}
}
}
// deleteRelatedList gets the list of resources related to resourceName using the
// provided listFunc and then calls the deleteRelated func for each relation.
func (d *Deleter) deleteRelatedList(resourceName string) {
if related, err := d.listRelated(resourceName); err != nil {
err = fmt.Errorf("failed to list %ss: %s", strings.ToLower(d.relatedKind), err)
d.appendError(err)
} else {
if len(related) > 0 {
for _, subresource := range related {
if err := d.deleteRelated(subresource); err != nil {
err = fmt.Errorf("failed to delete %s %q: %s", d.relatedKind, subresource, err)
d.appendError(err)
} else {
d.successfulRelatedDeletes = append(d.successfulRelatedDeletes, subresource)
}
}
} else {
err = fmt.Errorf("no %ss associated with %s %q", d.relatedKind, d.kind, resourceName)
d.appendError(err)
}
}
}
// PrintSuccesses writes success messages to the provided stdout stream.
func (d *Deleter) PrintSuccesses(streams *cli.Stream) {
if len(d.successfulRelatedDeletes) > 0 {
fmt.Fprintf(streams.Out, "%ss deleted: %s\n", d.relatedKind, names.QuotedList(d.successfulRelatedDeletes))
}
if len(d.successfulDeletes) > 0 {
fmt.Fprintf(streams.Out, "%ss deleted: %s\n", d.kind, names.QuotedList(d.successfulDeletes))
}
}
// appendError adds that error to the list of accumulated errors that
// have occurred during execution.
func (d *Deleter) appendError(err error) {
d.errors = append(d.errors, err)
}
// Errors returns any accumulated errors in the operation of this deleter.
func (d *Deleter) Errors() error {
return multierr.Combine(d.errors...)
}