util

Documentation

Index

• Variables
• func ComputeTagsDelta(a []*svcapitypes.Tag, b []*svcapitypes.Tag) (addedOrUpdated []*svcapitypes.Tag, removed []*string)
• func EqualTags(a []*svcapitypes.Tag, b []*svcapitypes.Tag) bool
• func NewErrUnknownParameter(name string) error
• func NewErrUnmodifiableParameter(name string) error
• type MetaFetcher
• type ParamMeta
• type ParamMetaCache
  • func (c *ParamMetaCache) Get(ctx context.Context, family string, name string, fetcher MetaFetcher) (*ParamMeta, error)
• type Parameters
  • func ChunkParameters(input Parameters, chunkSize int) []Parameters
  • func GetParametersDifference(to, from Parameters) (added, unchanged, removed Parameters)

Variables

var (
	ErrUnknownParameter      = fmt.Errorf("unknown parameter")
	ErrUnmodifiableParameter = fmt.Errorf("parameter is not modifiable")
)

Functions

func ComputeTagsDelta

func ComputeTagsDelta(
	a []*svcapitypes.Tag,
	b []*svcapitypes.Tag,
) (addedOrUpdated []*svcapitypes.Tag, removed []*string)

computeTagsDelta compares two Tag arrays and return two different list containing the addedOrupdated and removed tags. The removed tags array only contains the tags Keys.

func EqualTags

func EqualTags(
	a []*svcapitypes.Tag,
	b []*svcapitypes.Tag,
) bool

equalTags returns true if two Tag arrays are equal regardless of the order of their elements.

func NewErrUnknownParameter

func NewErrUnknownParameter(name string) error

NewErrUnknownParameter generates an ACK terminal error about an unknown parameter

func NewErrUnmodifiableParameter

func NewErrUnmodifiableParameter(name string) error

NewErrUnmodifiableParameter generates an ACK terminal error about a parameter that may not be modified

Types

type MetaFetcher

type MetaFetcher func(ctx context.Context, family string) (map[string]ParamMeta, error)

MetaFetcher is the functor we pass to the paramMetaCache that allows it to fetch engine default parameter information

type ParamMeta

type ParamMeta struct {
	IsModifiable bool
	IsDynamic    bool
}

ParamMeta stores metadata about a parameter in a parameter group

type ParamMetaCache

type ParamMetaCache struct {
	sync.RWMutex
	Hits   uint64
	Misses uint64
	Cache  map[string]map[string]ParamMeta
}

ParamMetaCache stores information about a parameter for a DB parameter group family. We use this cached information to determine whether a parameter is statically or dynamically defined (whether changes can be applied immediately or pending a reboot) and whether a parameter is modifiable.

Keeping things super simple for now and not adding any TTL or expiration behaviour to the cache. Engine defaults are pretty static information...

func (*ParamMetaCache) Get

func (c *ParamMetaCache) Get(
	ctx context.Context,
	family string,
	name string,
	fetcher MetaFetcher,
) (*ParamMeta, error)

Get retrieves the metadata for a named parameter group family and parameter name.

type Parameters

type Parameters map[string]*string

Parameters represents the elements of a DB Parameter Group or a DB Cluster Parameter Group

func ChunkParameters

func ChunkParameters(
	input Parameters,
	chunkSize int,
) []Parameters

ChunkParameters splits a supplied map of parameters into multiple slices of maps of parameters of a given size.

func GetParametersDifference

func GetParametersDifference(
	to, from Parameters,
) (added, unchanged, removed Parameters)

GetParametersDifference compares two Parameters maps and returns the parameters to add & update, the unchanged parameters, and the parameters to remove