vendor/github.com/influxdata/influxdb/models/consistency.go


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package models

import (
    "errors"
    "strings"
)

// ConsistencyLevel represent a required replication criteria before a write can
// be returned as successful.
//
// The consistency level is handled in open-source InfluxDB but only applicable to clusters.
type ConsistencyLevel int

const (
    // ConsistencyLevelAny allows for hinted handoff, 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
    }
}