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package models
import (
"errors"
"strings"
)
// ConsistencyLevel represent a required replication criteria before a write can
// be returned as successful
type ConsistencyLevel int
const (
// ConsistencyLevelAny allows for hinted hand off, potentially no write happened yet
ConsistencyLevelAny ConsistencyLevel = iota
// ConsistencyLevelOne requires at least one data node acknowledged a write
ConsistencyLevelOne
// ConsistencyLevelQuorum requires a quorum of data nodes to acknowledge a write
ConsistencyLevelQuorum
// ConsistencyLevelAll requires all data nodes to acknowledge a write
ConsistencyLevelAll
)
var (
// ErrInvalidConsistencyLevel is returned when parsing the string version
// of a consistency level.
ErrInvalidConsistencyLevel = errors.New("invalid consistency level")
)
// ParseConsistencyLevel converts a consistency level string to the corresponding ConsistencyLevel const
func ParseConsistencyLevel(level string) (ConsistencyLevel, error) {
switch strings.ToLower(level) {
case "any":
return ConsistencyLevelAny, nil
case "one":
return ConsistencyLevelOne, nil
case "quorum":
return ConsistencyLevelQuorum, nil
case "all":
return ConsistencyLevelAll, nil
default:
return 0, ErrInvalidConsistencyLevel
}
}
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