mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
synced 2024-12-25 11:50:13 +01:00
289 lines
8.0 KiB
Go
289 lines
8.0 KiB
Go
package config
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import (
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"crypto/md5"
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"fmt"
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"hash/fnv"
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"net/url"
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"os"
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"path/filepath"
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"sort"
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"strings"
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"gopkg.in/yaml.v2"
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"github.com/VictoriaMetrics/VictoriaMetrics/app/vmalert/utils"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/envtemplate"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/promutils"
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)
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// Group contains list of Rules grouped into
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// entity with one name and evaluation interval
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type Group struct {
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Type Type `yaml:"type,omitempty"`
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File string
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Name string `yaml:"name"`
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Interval *promutils.Duration `yaml:"interval,omitempty"`
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Limit int `yaml:"limit,omitempty"`
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Rules []Rule `yaml:"rules"`
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Concurrency int `yaml:"concurrency"`
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// Labels is a set of label value pairs, that will be added to every rule.
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// It has priority over the external labels.
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Labels map[string]string `yaml:"labels"`
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// Checksum stores the hash of yaml definition for this group.
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// May be used to detect any changes like rules re-ordering etc.
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Checksum string
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// Optional HTTP URL parameters added to each rule request
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Params url.Values `yaml:"params"`
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// Headers contains optional HTTP headers added to each rule request
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Headers []Header `yaml:"headers,omitempty"`
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// Catches all undefined fields and must be empty after parsing.
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XXX map[string]interface{} `yaml:",inline"`
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (g *Group) UnmarshalYAML(unmarshal func(interface{}) error) error {
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type group Group
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if err := unmarshal((*group)(g)); err != nil {
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return err
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}
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b, err := yaml.Marshal(g)
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if err != nil {
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return fmt.Errorf("failed to marshal group configuration for checksum: %w", err)
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}
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// change default value to prometheus datasource.
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if g.Type.Get() == "" {
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g.Type.Set(NewPrometheusType())
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}
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h := md5.New()
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h.Write(b)
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g.Checksum = fmt.Sprintf("%x", h.Sum(nil))
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return nil
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}
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// Validate check for internal Group or Rule configuration errors
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func (g *Group) Validate(validateTplFn ValidateTplFn, validateExpressions bool) error {
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if g.Name == "" {
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return fmt.Errorf("group name must be set")
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}
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uniqueRules := map[uint64]struct{}{}
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for _, r := range g.Rules {
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ruleName := r.Record
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if r.Alert != "" {
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ruleName = r.Alert
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}
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if _, ok := uniqueRules[r.ID]; ok {
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return fmt.Errorf("%q is a duplicate within the group %q", r.String(), g.Name)
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}
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uniqueRules[r.ID] = struct{}{}
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if err := r.Validate(); err != nil {
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return fmt.Errorf("invalid rule %q.%q: %w", g.Name, ruleName, err)
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}
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if validateExpressions {
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// its needed only for tests.
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// because correct types must be inherited after unmarshalling.
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exprValidator := g.Type.ValidateExpr
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if err := exprValidator(r.Expr); err != nil {
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return fmt.Errorf("invalid expression for rule %q.%q: %w", g.Name, ruleName, err)
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}
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}
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if validateTplFn != nil {
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if err := validateTplFn(r.Annotations); err != nil {
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return fmt.Errorf("invalid annotations for rule %q.%q: %w", g.Name, ruleName, err)
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}
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if err := validateTplFn(r.Labels); err != nil {
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return fmt.Errorf("invalid labels for rule %q.%q: %w", g.Name, ruleName, err)
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}
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}
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}
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return checkOverflow(g.XXX, fmt.Sprintf("group %q", g.Name))
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}
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// Rule describes entity that represent either
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// recording rule or alerting rule.
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type Rule struct {
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ID uint64
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Record string `yaml:"record,omitempty"`
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Alert string `yaml:"alert,omitempty"`
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Expr string `yaml:"expr"`
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For *promutils.Duration `yaml:"for,omitempty"`
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Labels map[string]string `yaml:"labels,omitempty"`
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Annotations map[string]string `yaml:"annotations,omitempty"`
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Debug bool `yaml:"debug,omitempty"`
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// Catches all undefined fields and must be empty after parsing.
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XXX map[string]interface{} `yaml:",inline"`
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}
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// UnmarshalYAML implements the yaml.Unmarshaler interface.
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func (r *Rule) UnmarshalYAML(unmarshal func(interface{}) error) error {
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type rule Rule
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if err := unmarshal((*rule)(r)); err != nil {
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return err
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}
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r.ID = HashRule(*r)
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return nil
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}
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// Name returns Rule name according to its type
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func (r *Rule) Name() string {
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if r.Record != "" {
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return r.Record
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}
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return r.Alert
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}
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// String implements Stringer interface
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func (r *Rule) String() string {
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ruleType := "recording"
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if r.Alert != "" {
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ruleType = "alerting"
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}
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b := strings.Builder{}
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b.WriteString(fmt.Sprintf("%s rule %q", ruleType, r.Name()))
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b.WriteString(fmt.Sprintf("; expr: %q", r.Expr))
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kv := sortMap(r.Labels)
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for i := range kv {
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if i == 0 {
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b.WriteString("; labels:")
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}
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b.WriteString(" ")
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b.WriteString(kv[i].key)
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b.WriteString("=")
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b.WriteString(kv[i].value)
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if i < len(kv)-1 {
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b.WriteString(",")
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}
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}
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return b.String()
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}
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// HashRule hashes significant Rule fields into
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// unique hash that supposed to define Rule uniqueness
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func HashRule(r Rule) uint64 {
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h := fnv.New64a()
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h.Write([]byte(r.Expr))
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if r.Record != "" {
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h.Write([]byte("recording"))
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h.Write([]byte(r.Record))
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} else {
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h.Write([]byte("alerting"))
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h.Write([]byte(r.Alert))
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}
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kv := sortMap(r.Labels)
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for _, i := range kv {
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h.Write([]byte(i.key))
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h.Write([]byte(i.value))
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h.Write([]byte("\xff"))
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}
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return h.Sum64()
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}
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// Validate check for Rule configuration errors
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func (r *Rule) Validate() error {
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if (r.Record == "" && r.Alert == "") || (r.Record != "" && r.Alert != "") {
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return fmt.Errorf("either `record` or `alert` must be set")
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}
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if r.Expr == "" {
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return fmt.Errorf("expression can't be empty")
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}
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return checkOverflow(r.XXX, "rule")
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}
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// ValidateTplFn must validate the given annotations
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type ValidateTplFn func(annotations map[string]string) error
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// Parse parses rule configs from given file patterns
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func Parse(pathPatterns []string, validateTplFn ValidateTplFn, validateExpressions bool) ([]Group, error) {
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var fp []string
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for _, pattern := range pathPatterns {
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matches, err := filepath.Glob(pattern)
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if err != nil {
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return nil, fmt.Errorf("error reading file pattern %s: %w", pattern, err)
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}
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fp = append(fp, matches...)
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}
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errGroup := new(utils.ErrGroup)
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var groups []Group
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for _, file := range fp {
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uniqueGroups := map[string]struct{}{}
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gr, err := parseFile(file)
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if err != nil {
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errGroup.Add(fmt.Errorf("failed to parse file %q: %w", file, err))
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continue
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}
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for _, g := range gr {
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if err := g.Validate(validateTplFn, validateExpressions); err != nil {
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errGroup.Add(fmt.Errorf("invalid group %q in file %q: %w", g.Name, file, err))
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continue
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}
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if _, ok := uniqueGroups[g.Name]; ok {
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errGroup.Add(fmt.Errorf("group name %q duplicate in file %q", g.Name, file))
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continue
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}
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uniqueGroups[g.Name] = struct{}{}
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g.File = file
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groups = append(groups, g)
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}
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}
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if err := errGroup.Err(); err != nil {
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return nil, err
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}
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if len(groups) < 1 {
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logger.Warnf("no groups found in %s", strings.Join(pathPatterns, ";"))
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}
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return groups, nil
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}
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func parseFile(path string) ([]Group, error) {
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data, err := os.ReadFile(path)
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if err != nil {
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return nil, fmt.Errorf("error reading alert rule file %q: %w", path, err)
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}
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data, err = envtemplate.Replace(data)
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if err != nil {
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return nil, fmt.Errorf("cannot expand environment vars in %q: %w", path, err)
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}
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g := struct {
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Groups []Group `yaml:"groups"`
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// Catches all undefined fields and must be empty after parsing.
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XXX map[string]interface{} `yaml:",inline"`
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}{}
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err = yaml.Unmarshal(data, &g)
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if err != nil {
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return nil, err
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}
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return g.Groups, checkOverflow(g.XXX, "config")
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}
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func checkOverflow(m map[string]interface{}, ctx string) error {
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if len(m) > 0 {
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var keys []string
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for k := range m {
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keys = append(keys, k)
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}
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return fmt.Errorf("unknown fields in %s: %s", ctx, strings.Join(keys, ", "))
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}
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return nil
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}
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type item struct {
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key, value string
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}
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func sortMap(m map[string]string) []item {
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var kv []item
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for k, v := range m {
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kv = append(kv, item{key: k, value: v})
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}
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sort.Slice(kv, func(i, j int) bool {
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return kv[i].key < kv[j].key
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})
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return kv
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}
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