storage

Documentation

Overview

Package storage provides the storage client for the controllers package

Index

• func GetVolumeUsage(path string) (uint64, uint64, error)
• type Interface
• type MetricSummary
• type SummarizedMetric
• type VersionMetricSummary
• type VersionMetrics

Functions

func GetVolumeUsage

func GetVolumeUsage(path string) (uint64, uint64, error)

GetVolumeUsage gets the available and total capacity of a volume, in that order

Types

type Interface

type Interface interface {
	// Returns a nested map of the metrics data for a particular application, version, and signature
	// Example:
	//	{
	//		"my-metric": {
	//			"MetricsOverTransactions": [1, 1, 3, 4, 5]
	//			"MetricsOverUsers": [2, 7, 5]
	//		}
	//	}
	//
	// NOTE: for users that have not produced any metrics (for example, via lookup()), GetMetrics() will add 0s for the extra users in metricsOverUsers
	// Example, given 5 total users:
	//
	//	{
	//		"my-metric": {
	//			"MetricsOverTransactions": [1, 1, 3, 4, 5]
	//			"MetricsOverUsers": [2, 7, 5, 0, 0]
	//		}
	//	}
	GetMetrics(applicationName string, version int, signature string) (*VersionMetrics, error)

	// called by the A/B/n SDK gRPC API implementation (SDK for application clients)
	// Example key: kt-metric::my-app::0::my-signature::my-metric::my-user::my-transaction-id -> my-metric-value (get the metric value with all the provided information)
	SetMetric(applicationName string, version int, signature, metric, user, transaction string, metricValue float64) error

	// Example key: kt-users::my-app::0::my-signature::my-user -> true
	SetUser(applicationName string, version int, signature, user string) error
}

Interface enables interaction with a storage entity Can be mocked in unit tests with fake implementation

type MetricSummary

type MetricSummary struct {
	// all transactions
	SummaryOverTransactions SummarizedMetric

	// cumulative metrics per user
	SummaryOverUsers SummarizedMetric
}

MetricSummary contains metric summary for all metrics as well as cumulative metrics per user

type SummarizedMetric

type SummarizedMetric struct {
	Count  uint64
	Mean   float64
	StdDev float64
	Min    float64
	Max    float64
}

SummarizedMetric is a metric summary

type VersionMetricSummary

type VersionMetricSummary struct {
	NumUsers uint64

	// key = metric name; value is the metric summary
	MetricSummaries map[string]MetricSummary
}

VersionMetricSummary is a metric summary for a given app version

type VersionMetrics

type VersionMetrics map[string]struct {
	MetricsOverTransactions []float64
	MetricsOverUsers        []float64
}

VersionMetrics contains all the metrics over transactions and over users key = metric name