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Merge branch '143-crawler-refactoring' into raw-module-with-neutron
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,11 @@ | ||
| package healthchecker | ||
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| import "time" | ||
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| type Config struct { | ||
| MaxBlockLag time.Duration `env:"HEALTHCHECK_MAX_LAST_BLOCK_LAG" envDefault:"5m"` | ||
| Interval time.Duration `env:"HEALTHCHECK_INTERVAL" envDefault:"1m"` | ||
| StartDelay time.Duration `env:"HEALTHCHECK_START_DELAY"` | ||
| Enabled bool `env:"HEALTHCHECK_ENABLED" envDefault:"false"` | ||
| FatalOnCheck bool `env:"HEALTHCHECK_FATAL_ON_CHECK" envDefault:"true"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| package healthchecker | ||
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| import ( | ||
| "context" | ||
| "time" | ||
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| "github.com/rs/zerolog" | ||
| ) | ||
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| const defaultInterval = time.Minute | ||
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| type ( | ||
| CheckFn func(ctx context.Context, log *zerolog.Logger) bool | ||
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| Checker struct { | ||
| log *zerolog.Logger | ||
| cancel context.CancelFunc | ||
| isHealth CheckFn | ||
| cfg Config | ||
| } | ||
| ) | ||
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| func New(l zerolog.Logger, checkFn CheckFn, cfg Config) *Checker { | ||
| l = l.With().Str("cmp", "healthchecker").Logger() | ||
|
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| if cfg.Interval == 0 { | ||
| cfg.Interval = defaultInterval | ||
| } | ||
|
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| return &Checker{ | ||
| log: &l, | ||
| isHealth: checkFn, | ||
| cfg: cfg, | ||
| } | ||
| } | ||
|
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| func (c *Checker) Start(_ context.Context) error { | ||
| if !c.cfg.Enabled { | ||
| return nil | ||
| } | ||
|
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| go c.run() | ||
| return nil | ||
| } | ||
|
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| func (c *Checker) Stop(_ context.Context) error { | ||
| if !c.cfg.Enabled { | ||
| return nil | ||
| } | ||
|
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| c.cancel() | ||
| return nil | ||
| } | ||
|
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| func (c *Checker) run() { | ||
| ctx, cancel := context.WithCancel(context.Background()) | ||
| c.cancel = cancel | ||
|
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| if c.cfg.StartDelay > 0 { | ||
| <-time.Tick(c.cfg.StartDelay) //nolint:staticcheck | ||
| } | ||
|
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| ticker := time.NewTicker(c.cfg.Interval) | ||
| defer ticker.Stop() | ||
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| c.log.Debug().Msg("checker started") | ||
|
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| for { | ||
| select { | ||
| case <-ctx.Done(): | ||
| c.log.Info().Msg("checker stopped") | ||
| return | ||
| case <-ticker.C: | ||
| c.log.Info().Msg("checking health") | ||
|
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| func() { | ||
| ctx2, cancel2 := context.WithTimeout(ctx, c.cfg.Interval/2) | ||
| defer cancel2() | ||
|
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| if !c.isHealth(ctx2, c.log) { | ||
| if c.cfg.FatalOnCheck { | ||
| c.log.Fatal().Msg("service is not healthy") | ||
| return | ||
| } | ||
|
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| c.log.Warn().Msg("service is not healthy") | ||
| } | ||
| }() | ||
| } | ||
| } | ||
| } |