db

Documentation

Overview

package db provides some overarching variables, structs, and interfaces that different database implementations can use and implement and consumers can expect.

Index

• Constants
• type EventType
  • func ParseEventType(event string) EventType
  • func (i EventType) String() string
• type Inserter
• type Pruner
• type Record
  • func (Record) TableName() string
• type RecordGetter
• type RecordToDelete

Constants

const (
	// TypeLabel is for labeling metrics; if there is a single metric for
	// successful queries, the typeLabel and corresponding type can be used
	// when incrementing the metric.
	TypeLabel         = "type"
	InsertType        = "insert"
	DeleteType        = "delete"
	ReadType          = "read"
	PingType          = "ping"
	BlacklistReadType = "blacklistRead"
)

Types

type EventType

type EventType int

EventType is an enum for specifying the type of event being stored.

const (
	// default event type
	Default EventType = iota

	// event type for online and offline events
	State
)

func ParseEventType

func ParseEventType(event string) EventType

ParseEventType returns the enum when given a string.

func (EventType) String

func (i EventType) String() string

type Inserter

type Inserter interface {
	InsertRecords(records ...Record) error
}

Inserter is something that can insert records into the database.

type Pruner

type Pruner interface {
	GetRecordsToDelete(shard int, limit int, deathDate int64) ([]RecordToDelete, error)
	// PruneRecords(records []int) error
	DeleteRecord(shard int, deathdate int64, recordID int64) error
}

Pruner is something that can get a list of expired records and delete them. Deleting is done individually.

type Record

type Record struct {
	Type      EventType `json:"type" bson:"type" gorm:"type:int"`
	DeviceID  string    `json:"deviceid" bson:"deviceid"`
	BirthDate int64     `json:"birthdate" bson:"birthdate"`
	DeathDate int64     `json:"deathdate" bson:"deathdate"`
	Data      []byte    `json:"data" bson:"data"`
	Nonce     []byte    `json:"nonce" bson:"nonce"`
	Alg       string    `json:"alg" bson:"alg"`
	KID       string    `json:"kid" bson:"kid" gorm:"Column:kid"`
}

Record is the struct used to insert an event into the database. It includes the marshaled, and possibly encrypted, event ("Data") and then other metadata to be used for the record. If the data is encrypted, the Nonce, Alg, and KID values will be needed to determine how to correctly decrypt it.

func (Record) TableName

func (Record) TableName() string

TableName sets Record's table name to be "events"; for the GORM driver.

type RecordGetter

type RecordGetter interface {
	GetRecords(deviceID string, limit int) ([]Record, error)
	GetRecordsOfType(deviceID string, limit int, eventType EventType) ([]Record, error)
}

RecordGetter is something that can get records, including only getting records of a certain type.

type RecordToDelete

type RecordToDelete struct {
	DeathDate int64 `json:"deathdate" bson:"deathdate"`
	RecordID  int64 `json:"recordid" bson:"recordid"`
}

RecordToDelete is the information needed to get out of the database in order to call the DeleteRecord function