simplestreams

package
v0.0.0-...-a0d7459 Latest Latest
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 Go to latest Published: Mar 21, 2017 License: AGPL-3.0 Imports: 18 Imported by: 0

Documentation

Overview

The simplestreams package supports locating, parsing, and filtering metadata in simplestreams format. See http://launchpad.net/simplestreams and in particular the doc/README file in that project for more information about the file formats.

Users of this package provide an empty struct and a matching function to be able to query and return a list of typed values for a given criteria.

Index

Constants

View Source 
const (

	// EXISTING_CLOUD_DATA is the lowest in priority.
	// It is mostly used in merge functions
	// where existing data does not need to be ranked.
	EXISTING_CLOUD_DATA = 0

	// DEFAULT_CLOUD_DATA is used for common cloud data that
	// is shared an is publically available.
	DEFAULT_CLOUD_DATA = 10

	// SPECIFIC_CLOUD_DATA is used to rank cloud specific data
	// above commonly available.
	// For e.g., openstack's "keystone catalogue".
	SPECIFIC_CLOUD_DATA = 20

	// CUSTOM_CLOUD_DATA is the highest available ranking and
	// is given to custom data.
	CUSTOM_CLOUD_DATA = 50
)
View Source 
const (
	MirrorFile = "streams/v1/cpc-mirrors.json"

	SignedSuffix   = ".sjson"
	UnsignedSuffix = ".json"

	// These constants define the currently supported simplestreams data formats.
	IndexFormat   = "index:1.0"
	ProductFormat = "products:1.0"
	MirrorFormat  = "mirrors:1.0"
)
View Source 
const SimplestreamsPublicKeyFile = "publicsimplestreamskey"

Variables

View Source 
var EmptyCloudSpec = CloudSpec{}

EmptyCloudSpec is used when we want all records regardless of cloud to be loaded.

Functions

func DecodeCheckSignature 

func DecodeCheckSignature(r io.Reader, armoredPublicKey string) ([]byte, error)

DecodeCheckSignature parses the inline signed PGP text, checks the signature, and returns plain text if the signature matches.

func Encode 

func Encode(r io.Reader, armoredPrivateKey, passphrase string) ([]byte, error)

Encode signs the data returned by the reader and returns an inline signed copy.

func GetLatestMetadata 

func GetLatestMetadata(metadata *CloudMetadata, cons LookupConstraint, source DataSource, filterFunc AppendMatchingFunc) ([]interface{}, error)

GetLatestMetadata extracts and returns the metadata records matching the given criteria.

func MirrorsPath 

func MirrorsPath(streamsVersion string) string

MirrorsPath returns the mirrors path for streamsVersion.

func RegisterStructTags 

func RegisterStructTags(vals ...interface{})

RegisterStructTags ensures the json tags for the given structs are able to be used when parsing the simplestreams metadata.

func UnsignedIndex 

func UnsignedIndex(streamsVersion string, indexFileVersion int) string

UnsignedIndex returns an unsigned index file name for streamsVersion.

func UnsignedMirror 

func UnsignedMirror(streamsVersion string) string

UnsignedMirror returns an unsigned mirror file name for streamsVersion.

func UserPublicSigningKey 

func UserPublicSigningKey() (string, error)

UserPublicSigningKey returns the public signing key (if defined).

Types

type AppendMatchingFunc 

type AppendMatchingFunc func(DataSource, []interface{}, map[string]interface{}, LookupConstraint) ([]interface{}, error)

AppendMatchingFunc is the filter function signature used in our simple streams parsing code. It collects matching items from a DataSource in the returned interface slice.

type CloudMetadata 

type CloudMetadata struct {
	Products   map[string]MetadataCatalog    `json:"products"`
	Aliases    map[string]aliasesByAttribute `json:"_aliases,omitempty"`
	Updated    string                        `json:"updated"`
	Format     string                        `json:"format"`
	ContentId  string                        `json:"content_id"`
	RegionName string                        `json:"region,omitempty"`
	Endpoint   string                        `json:"endpoint,omitempty"`
	Storage    string                        `json:"root_store,omitempty"`
	VirtType   string                        `json:"virt,omitempty"`
}

func ParseCloudMetadata 

func ParseCloudMetadata(data []byte, format, url string, valueTemplate interface{}) (*CloudMetadata, error)

ParseCloudMetadata parses the given bytes into simplestreams metadata.

type CloudSpec 

type CloudSpec struct {
	Region   string `json:"region"`
	Endpoint string `json:"endpoint"`
}

CloudSpec uniquely defines a specific cloud deployment.

type DataSource 

type DataSource interface {
	// Description describes the origin of this datasource.
	// eg agent-metadata-url, cloud storage, keystone catalog etc.
	Description() string

	// Fetch loads the data at the specified relative path. It returns a reader from which
	// the data can be retrieved as well as the full URL of the file. The full URL is typically
	// used in log messages to help diagnose issues accessing the data.
	Fetch(path string) (io.ReadCloser, string, error)

	// URL returns the full URL of the path, as applicable to this datasource.
	// This method is used primarily for logging purposes.
	URL(path string) (string, error)

	// PublicSigningKey returns the public key used to validate signed metadata.
	PublicSigningKey() string

	// SetAllowRetry sets the flag which determines if the datasource will retry fetching the metadata
	// if it is not immediately available.
	SetAllowRetry(allow bool)
	// Priority is an importance factor for Data Source. Higher number means higher priority.
	// This is will allow to sort data sources in order of importance.
	Priority() int
	// RequireSigned indicates whether this data source requires signed data.
	RequireSigned() bool
}

A DataSource retrieves simplestreams metadata.

func NewURLDataSource 

func NewURLDataSource(description, baseURL string, hostnameVerification utils.SSLHostnameVerification, priority int, requireSigned bool) DataSource

NewURLDataSource returns a new datasource reading from the specified baseURL.

func NewURLSignedDataSource 

func NewURLSignedDataSource(description, baseURL, publicKey string, hostnameVerification utils.SSLHostnameVerification, priority int, requireSigned bool) DataSource

NewURLSignedDataSource returns a new datasource for signed metadata reading from the specified baseURL.

type GetMetadataParams 

type GetMetadataParams struct {
	StreamsVersion   string
	LookupConstraint LookupConstraint
	ValueParams      ValueParams
}

GetMetadataParams defines parameters used to load simplestreams metadata.

type HasRegion 

type HasRegion interface {
	// Region returns the necessary attributes to uniquely identify this cloud instance.
	// Currently these attributes are "region" and "endpoint" values.
	Region() (CloudSpec, error)
}

HasRegion is implemented by instances which can provide a region to which they belong. A region is defined by region name and endpoint.

type IndexMetadata 

type IndexMetadata struct {
	Updated          string      `json:"updated"`
	Format           string      `json:"format"`
	DataType         string      `json:"datatype"`
	CloudName        string      `json:"cloudname,omitempty"`
	Clouds           []CloudSpec `json:"clouds,omitempty"`
	ProductsFilePath string      `json:"path"`
	ProductIds       []string    `json:"products"`
}

func (*IndexMetadata) String 

func (metadata *IndexMetadata) String() string

type IndexMetadataSlice 

type IndexMetadataSlice []*IndexMetadata

type IndexReference 

type IndexReference struct {
	Indices
	MirroredProductsPath string
	Source               DataSource
	// contains filtered or unexported fields
}

Exported for testing.

func GetIndexWithFormat 

func GetIndexWithFormat(source DataSource, indexPath, indexFormat, mirrorsPath string, requireSigned bool,
	cloudSpec CloudSpec, params ValueParams) (*IndexReference, error)

GetIndexWithFormat returns a simplestreams index of the specified format. Exported for testing.

func (*IndexReference) GetCloudMetadataWithFormat 

func (indexRef *IndexReference) GetCloudMetadataWithFormat(cons LookupConstraint, format string, requireSigned bool) (*CloudMetadata, error)

GetCloudMetadataWithFormat loads the entire cloud metadata encoded using the specified format. Exported for testing.

func (*IndexReference) GetProductsPath 

func (indexRef *IndexReference) GetProductsPath(cons LookupConstraint) (string, error)

GetProductsPath returns the path to the metadata file containing products for the specified constraint. Exported for testing.

type Indices 

type Indices struct {
	Indexes map[string]*IndexMetadata `json:"index"`
	Updated string                    `json:"updated"`
	Format  string                    `json:"format"`
}

type ItemCollection 

type ItemCollection struct {
	Items      map[string]interface{} `json:"items"`
	Arch       string                 `json:"arch,omitempty"`
	Series     string                 `json:"release,omitempty"`
	Version    string                 `json:"version,omitempty"`
	RegionName string                 `json:"region,omitempty"`
	Endpoint   string                 `json:"endpoint,omitempty"`
	Storage    string                 `json:"root_store,omitempty"`
	VirtType   string                 `json:"virt,omitempty"`
	// contains filtered or unexported fields
}

func (*ItemCollection) UnmarshalJSON 

func (c *ItemCollection) UnmarshalJSON(b []byte) error

ItemsCollection.UnmarshalJSON unmarshals the ItemCollection, storing the raw bytes for each item. These can later be unmarshalled again into product-specific types.

type LookupConstraint 

type LookupConstraint interface {
	// IndexIds generates a string array representing index ids formed similarly to an ISCSI qualified name (IQN).
	IndexIds() []string
	// ProductIds generates a string array representing product ids formed similarly to an ISCSI qualified name (IQN).
	ProductIds() ([]string, error)
	// Params returns the constraint parameters.
	Params() LookupParams
}

type LookupParams 

type LookupParams struct {
	CloudSpec
	Series []string
	Arches []string
	// Stream can be "" or "released" for the default "released" stream,
	// or "daily" for daily images, or any other stream that the available
	// simplestreams metadata supports.
	Stream string
}

LookupParams defines criteria used to find a metadata record. Derived structs implement the IndexIds() and ProductIds() method.

func (LookupParams) Params 

func (p LookupParams) Params() LookupParams

type MetadataCatalog 

type MetadataCatalog struct {
	Series     string `json:"release,omitempty"`
	Version    string `json:"version,omitempty"`
	Arch       string `json:"arch,omitempty"`
	RegionName string `json:"region,omitempty"`
	Endpoint   string `json:"endpoint,omitempty"`
	Storage    string `json:"root_store,omitempty"`
	VirtType   string `json:"virt,omitempty"`

	// Items is a mapping from version to an ItemCollection,
	// where the version is the date the items were produced,
	// in the format YYYYMMDD.
	Items map[string]*ItemCollection `json:"versions"`
}

type MetadataLookupParams 

type MetadataLookupParams struct {
	Region        string
	Series        string
	Architectures []string
	Endpoint      string
	Sources       []DataSource
	Stream        string
}

type MetadataValidator 

type MetadataValidator interface {
	MetadataLookupParams(region string) (*MetadataLookupParams, error)
}

MetadataValidator instances can provide parameters used to query simplestreams metadata to find information for the specified parameters. If region is "", then the implementation may use its own default region if it has one, or else returns an error.

type MirrorInfo 

type MirrorInfo struct {
	Clouds    []CloudSpec `json:"clouds"`
	MirrorURL string      `json:"mirror"`
	Path      string      `json:"path"`
}

type MirrorInfoSlice 

type MirrorInfoSlice []MirrorInfo

type MirrorMetadata 

type MirrorMetadata struct {
	Updated string                  `json:"updated"`
	Format  string                  `json:"format"`
	Mirrors map[string][]MirrorInfo `json:"mirrors"`
}

func GetMirrorMetadataWithFormat 

func GetMirrorMetadataWithFormat(source DataSource, mirrorPath, format string,
	requireSigned bool) (*MirrorMetadata, error)

GetMirrorMetadataWithFormat returns simplestreams mirror data of the specified format. Exported for testing.

type MirrorRefSlice 

type MirrorRefSlice []MirrorReference

type MirrorReference 

type MirrorReference struct {
	Updated  string      `json:"updated"`
	Format   string      `json:"format"`
	DataType string      `json:"datatype"`
	Path     string      `json:"path"`
	Clouds   []CloudSpec `json:"clouds,omitempty"`
}

type MirrorRefs 

type MirrorRefs struct {
	Mirrors map[string][]MirrorReference `json:"mirrors"`
}

type NotPGPSignedError 

type NotPGPSignedError struct{}

NotPGPSignedError is used when PGP text does not contain an inline signature.

func (*NotPGPSignedError) Error 

func (*NotPGPSignedError) Error() string

type ResolveInfo 

type ResolveInfo struct {
	Source    string `yaml:"source" json:"source"`
	Signed    bool   `yaml:"signed" json:"signed"`
	IndexURL  string `yaml:"indexURL" json:"indexURL"`
	MirrorURL string `yaml:"mirrorURL,omitempty" json:"mirrorURL,omitempty"`
}

func GetMetadata 

func GetMetadata(sources []DataSource, params GetMetadataParams) (items []interface{}, resolveInfo *ResolveInfo, err error)

GetMetadata returns metadata records matching the specified constraint,looking in each source for signed metadata. If onlySigned is false and no signed metadata is found in a source, the source is used to look for unsigned metadata. Each source is tried in turn until at least one signed (or unsigned) match is found.

type ValueParams 

type ValueParams struct {
	// The simplestreams data type key.
	DataType string
	// The key to use when looking for content mirrors.
	MirrorContentId string
	// A function used to filter and return records of a given type.
	FilterFunc AppendMatchingFunc
	// An struct representing the type of records to return.
	ValueTemplate interface{}
}

ValueParams contains the information required to pull out from the metadata structs of a particular type.

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