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source/custom: improved logging of expression matching

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Print out the result of applying an expression. Also, truncate the
output to max 10 elements (of items matched against) unless '-v 4'
verbosity level is in use.
This commit is contained in:
Markus Lehtonen 2021-05-04 10:27:41 +03:00
parent 6cbed379df
commit 52d9aa2244
1 changed files with 47 additions and 6 deletions
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53
source/custom/expression/expression.go
View file

@ -20,6 +20,7 @@ import (
"encoding/json"
"fmt"
"regexp"
"sort"
"strconv"
"strings"
@ -269,26 +270,66 @@ func (m *MatchExpression) Match(valid bool, value interface{}) (bool, error) {
// MatchKeys evaluates the MatchExpression against a set of keys.
func (m *MatchExpression) MatchKeys(name string, keys map[string]feature.Nil) (bool, error) {
klog.V(3).Infof("matching %q %q against %v", name, m.Op, keys)
matched := false
_, ok := keys[name]
switch m.Op {
case MatchAny:
return true, nil
matched = true
case MatchExists:
return ok, nil
matched = ok
case MatchDoesNotExist:
return !ok, nil
matched = !ok
default:
return false, fmt.Errorf("invalid Op %q when matching keys", m.Op)
}
if klog.V(3).Enabled() {
mString := map[bool]string{false: "no match", true: "match found"}[matched]
k := make([]string, 0, len(keys))
for n := range keys {
k = append(k, n)
}
sort.Strings(k)
if len(keys) < 10 || klog.V(4).Enabled() {
klog.Infof("%s when matching %q %q against %s", mString, name, m.Op, strings.Join(k, " "))
} else {
klog.Infof("%s when matching %q %q against %s... (list truncated)", mString, name, m.Op, strings.Join(k[0:10], ", "))
}
}
return matched, nil
}
// MatchValues evaluates the MatchExpression against a set of key-value pairs.
func (m *MatchExpression) MatchValues(name string, values map[string]string) (bool, error) {
klog.V(3).Infof("matching %q %q %v against %v", name, m.Op, m.Value, values)
v, ok := values[name]
return m.Match(ok, v)
matched, err := m.Match(ok, v)
if err != nil {
return false, err
}
if klog.V(3).Enabled() {
mString := map[bool]string{false: "no match", true: "match found"}[matched]
keys := make([]string, 0, len(values))
for k := range values {
keys = append(keys, k)
}
sort.Strings(keys)
kv := make([]string, len(keys))
for i, k := range keys {
kv[i] = k + ":" + values[k]
}
if len(values) < 10 || klog.V(4).Enabled() {
klog.Infof("%s when matching %q %q %v against %s", mString, name, m.Op, m.Value, strings.Join(kv, " "))
} else {
klog.Infof("%s when matching %q %q %v against %s... (list truncated)", mString, name, m.Op, m.Value, strings.Join(kv[0:10], " "))
}
}
return matched, nil
}
// matchExpression is a helper type for unmarshalling MatchExpression