88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
package redis
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import (
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"context"
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"fmt"
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"github.com/go-redis/redis/v8"
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"code.1533b4dc0.de/prskr/nurse/check"
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"code.1533b4dc0.de/prskr/nurse/config"
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"code.1533b4dc0.de/prskr/nurse/grammar"
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"code.1533b4dc0.de/prskr/nurse/validation"
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)
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var _ check.SystemChecker = (*PingCheck)(nil)
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type PingCheck struct {
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redis.UniversalClient
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validators validation.Validator[redis.Cmder]
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Message string
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}
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func (p PingCheck) Execute(ctx check.Context) error {
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if p.Message == "" {
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return p.Ping(ctx).Err()
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}
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for {
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select {
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case <-ctx.Done():
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return ctx.Err()
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default:
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attemptCtx, cancel := ctx.AttemptContext()
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err := p.executeAttempt(attemptCtx)
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cancel()
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if err == nil {
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return nil
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}
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}
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}
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}
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func (p PingCheck) executeAttempt(ctx context.Context) error {
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if resp, err := p.Do(ctx, "PING", p.Message).Text(); err != nil {
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return err
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} else if resp != p.Message {
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return fmt.Errorf("expected value %s got %s", p.Message, resp)
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}
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return nil
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}
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func (p *PingCheck) UnmarshalCheck(c grammar.Check, lookup config.ServerLookup) error {
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const (
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serverOnlyArgCount = 1
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serverAndMessageArgCount = 2
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)
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val, _ := GenericCommandValidatorFor("PONG")
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validators := validation.Chain[redis.Cmder]{}
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validators = append(validators, val)
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p.validators = validators
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init := c.Initiator
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switch len(init.Params) {
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case 0:
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return grammar.ErrMissingServer
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case serverAndMessageArgCount:
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if msg, err := init.Params[1].AsString(); err != nil {
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return err
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} else {
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val, _ := GenericCommandValidatorFor(msg)
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p.validators = validation.Chain[redis.Cmder]{val}
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}
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fallthrough
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case serverOnlyArgCount:
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if cli, err := clientFromParam(init.Params[0], lookup); err != nil {
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return err
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} else {
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p.UniversalClient = cli
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}
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return nil
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default:
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return grammar.ErrAmbiguousParamCount
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}
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}
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