cloudflare/pint
Publicmirrored from https://github.com/cloudflare/pintAvailable
internal/promapi/config.go
98lines · modecode
| 1 | package promapi |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "crypto/sha1" |
| 6 | "fmt" |
| 7 | "io" |
| 8 | "time" |
| 9 | |
| 10 | v1 "github.com/prometheus/client_golang/api/prometheus/v1" |
| 11 | "github.com/rs/zerolog/log" |
| 12 | "gopkg.in/yaml.v3" |
| 13 | ) |
| 14 | |
| 15 | type ConfigSectionGlobal struct { |
| 16 | ScrapeInterval time.Duration `yaml:"scrape_interval"` |
| 17 | ScrapeTimeout time.Duration `yaml:"scrape_timeout"` |
| 18 | EvaluationInterval time.Duration `yaml:"evaluation_interval"` |
| 19 | ExternalLabels map[string]string `yaml:"external_labels"` |
| 20 | } |
| 21 | |
| 22 | type PrometheusConfig struct { |
| 23 | Global ConfigSectionGlobal `yaml:"global"` |
| 24 | } |
| 25 | |
| 26 | type ConfigResult struct { |
| 27 | URI string |
| 28 | Config PrometheusConfig |
| 29 | } |
| 30 | |
| 31 | type configQuery struct { |
| 32 | prom *Prometheus |
| 33 | ctx context.Context |
| 34 | } |
| 35 | |
| 36 | func (q configQuery) Run() (any, error) { |
| 37 | log.Debug(). |
| 38 | Str("uri", q.prom.uri). |
| 39 | Msg("Getting prometheus configuration") |
| 40 | |
| 41 | ctx, cancel := context.WithTimeout(q.ctx, q.prom.timeout) |
| 42 | defer cancel() |
| 43 | |
| 44 | v, err := q.prom.api.Config(ctx) |
| 45 | if err != nil { |
| 46 | return nil, fmt.Errorf("failed to query Prometheus config: %w", err) |
| 47 | } |
| 48 | return v, nil |
| 49 | } |
| 50 | |
| 51 | func (q configQuery) Endpoint() string { |
| 52 | return "/api/v1/status/config" |
| 53 | } |
| 54 | |
| 55 | func (q configQuery) String() string { |
| 56 | return "/api/v1/status/config" |
| 57 | } |
| 58 | |
| 59 | func (q configQuery) CacheKey() string { |
| 60 | h := sha1.New() |
| 61 | _, _ = io.WriteString(h, q.Endpoint()) |
| 62 | return fmt.Sprintf("%x", h.Sum(nil)) |
| 63 | } |
| 64 | |
| 65 | func (p *Prometheus) Config(ctx context.Context) (*ConfigResult, error) { |
| 66 | log.Debug().Str("uri", p.uri).Msg("Scheduling Prometheus configuration query") |
| 67 | |
| 68 | resultChan := make(chan queryResult) |
| 69 | p.queries <- queryRequest{ |
| 70 | query: configQuery{prom: p, ctx: ctx}, |
| 71 | result: resultChan, |
| 72 | } |
| 73 | |
| 74 | result := <-resultChan |
| 75 | if result.err != nil { |
| 76 | return nil, QueryError{err: result.err, msg: decodeError(result.err)} |
| 77 | } |
| 78 | |
| 79 | var cfg PrometheusConfig |
| 80 | if err := yaml.Unmarshal([]byte(result.value.(v1.ConfigResult).YAML), &cfg); err != nil { |
| 81 | prometheusQueryErrorsTotal.WithLabelValues(p.name, "/api/v1/status/config", errReason(err)).Inc() |
| 82 | return nil, fmt.Errorf("failed to decode config data in %s response: %w", p.uri, err) |
| 83 | } |
| 84 | |
| 85 | if cfg.Global.ScrapeInterval == 0 { |
| 86 | cfg.Global.ScrapeInterval = time.Minute |
| 87 | } |
| 88 | if cfg.Global.ScrapeTimeout == 0 { |
| 89 | cfg.Global.ScrapeTimeout = time.Second * 10 |
| 90 | } |
| 91 | if cfg.Global.EvaluationInterval == 0 { |
| 92 | cfg.Global.EvaluationInterval = time.Minute |
| 93 | } |
| 94 | |
| 95 | r := ConfigResult{URI: p.uri, Config: cfg} |
| 96 | |
| 97 | return &r, nil |
| 98 | } |
| 99 | |