mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-10 07:34:04 -08:00
100 lines
2.6 KiB
Go
100 lines
2.6 KiB
Go
package rulefmt
|
|
|
|
import (
|
|
"io/ioutil"
|
|
|
|
"github.com/ghodss/yaml"
|
|
"github.com/pkg/errors"
|
|
"github.com/prometheus/prometheus/promql"
|
|
)
|
|
|
|
// Error represents semantical errors on parsing rule groups.
|
|
type Error struct {
|
|
Group string
|
|
Rule int
|
|
Err error
|
|
}
|
|
|
|
func (err *Error) Error() string {
|
|
return errors.Wrapf(err, "group %q, rule %d", err.Group, err.Rule).Error()
|
|
}
|
|
|
|
// RuleGroups is a set of rule groups that are typically exposed in a file.
|
|
type RuleGroups struct {
|
|
Version int `json:"version"`
|
|
Groups []RuleGroup `json:"groups"`
|
|
}
|
|
|
|
// Validate validates all rules in the rule groups.
|
|
func (g *RuleGroups) Validate() (errs []error) {
|
|
if g.Version != 1 {
|
|
errs = append(errs, errors.Errorf("invalid rule group version %d", g.Version))
|
|
}
|
|
for _, g := range g.Groups {
|
|
for i, r := range g.Rules {
|
|
for _, err := range r.Validate() {
|
|
errs = append(errs, &Error{
|
|
Group: g.Name,
|
|
Rule: i,
|
|
Err: err,
|
|
})
|
|
}
|
|
}
|
|
}
|
|
return errs
|
|
}
|
|
|
|
// RuleGroup is a list of sequentially evaluated recording and alerting rules.
|
|
type RuleGroup struct {
|
|
Name string `json:"name"`
|
|
Interval string `json:"interval"`
|
|
Rules []Rule `json:"rules"`
|
|
}
|
|
|
|
// Rule describes an alerting or recording rule.
|
|
type Rule struct {
|
|
Record string `json:"record"`
|
|
Alert string `json:"alert"`
|
|
Expr string `json:"expr"`
|
|
For string `json:"for"`
|
|
Labels map[string]string `json:"labels"`
|
|
Annotations map[string]string `json:"annotations"`
|
|
}
|
|
|
|
// Validate the rule and return a list of encountered errors.
|
|
func (r *Rule) Validate() (errs []error) {
|
|
if r.Record != "" && r.Alert != "" {
|
|
errs = append(errs, errors.Errorf("only one of 'record' and 'alert' must be set"))
|
|
}
|
|
if r.Record == "" && r.Alert == "" {
|
|
errs = append(errs, errors.Errorf("one of 'record' or 'alert' must be set"))
|
|
}
|
|
if r.Expr == "" {
|
|
errs = append(errs, errors.Errorf("field 'expr' must be set in rule"))
|
|
} else if _, err := promql.ParseExpr(r.Expr); err != nil {
|
|
errs = append(errs, errors.Errorf("could not parse expression: %s", err))
|
|
}
|
|
if r.Record != "" {
|
|
if len(r.Annotations) > 0 {
|
|
errs = append(errs, errors.Errorf("invalid field 'annotations' in recording rule"))
|
|
}
|
|
if r.For != "" {
|
|
errs = append(errs, errors.Errorf("invalid field 'for' in recording rule"))
|
|
}
|
|
}
|
|
return errs
|
|
}
|
|
|
|
// ParseFile parses the rule file and validates it.
|
|
func ParseFile(file string) (*RuleGroups, []error) {
|
|
b, err := ioutil.ReadFile(file)
|
|
if err != nil {
|
|
return nil, []error{err}
|
|
}
|
|
var groups RuleGroups
|
|
if err := yaml.Unmarshal(b, &groups); err != nil {
|
|
return nil, []error{err}
|
|
}
|
|
return &groups, groups.Validate()
|
|
}
|