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package simplestreams

import "github.com/juju/juju/environs/simplestreams"

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

Package Files

datasource.go decode.go encode.go json.go simplestreams.go validation.go

Constants

❖
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
)
❖
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"
)
❖
const SimplestreamsPublicKeyFile = "publicsimplestreamskey"

Variables

❖
var EmptyCloudSpec = CloudSpec{}

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

func DecodeCheckSignature Uses

❖
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 Uses

❖
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 Uses

❖
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 Uses

❖
func MirrorsPath(streamsVersion string) string

MirrorsPath returns the mirrors path for streamsVersion.

func RegisterStructTags Uses

❖
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 Uses

❖
func UnsignedIndex(streamsVersion string, indexFileVersion int) string

UnsignedIndex returns an unsigned index file name for streamsVersion.

func UnsignedMirror Uses

❖
func UnsignedMirror(streamsVersion string) string

UnsignedMirror returns an unsigned mirror file name for streamsVersion.

func UserPublicSigningKey Uses

❖
func UserPublicSigningKey() (string, error)

UserPublicSigningKey returns the public signing key (if defined).

type AppendMatchingFunc Uses

❖
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 Uses

❖
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 Uses

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

ParseCloudMetadata parses the given bytes into simplestreams metadata.

type CloudSpec Uses

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

CloudSpec uniquely defines a specific cloud deployment.

type DataSource Uses

❖
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 Uses

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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 Uses

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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 Uses

❖
type GetMetadataParams struct {
    StreamsVersion   string
    LookupConstraint LookupConstraint
    ValueParams      ValueParams
}

GetMetadataParams defines parameters used to load simplestreams metadata.

type HasRegion Uses

❖
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 Uses

❖
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 Uses

❖
func (metadata *IndexMetadata) String() string

type IndexMetadataSlice Uses

❖
type IndexMetadataSlice []*IndexMetadata

type IndexReference Uses

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

Exported for testing.

func GetIndexWithFormat Uses

❖
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 Uses

❖
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 Uses

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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 Uses

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

type ItemCollection Uses

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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 Uses

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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 Uses

❖
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 Uses

❖
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 Uses

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func (p LookupParams) Params() LookupParams

type MetadataCatalog Uses

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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 Uses

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

type MetadataValidator Uses

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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 Uses

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

type MirrorInfoSlice Uses

❖
type MirrorInfoSlice []MirrorInfo

type MirrorMetadata Uses

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

func GetMirrorMetadataWithFormat Uses

❖
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 Uses

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type MirrorRefSlice []MirrorReference

type MirrorReference Uses

❖
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 Uses

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

type NotPGPSignedError Uses

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type NotPGPSignedError struct{}

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

func (*NotPGPSignedError) Error Uses

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func (*NotPGPSignedError) Error() string

type ResolveInfo Uses

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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 Uses

❖
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 Uses

❖
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.

Directories

PathSynopsis
testing

Package simplestreams imports 18 packages (graph) and is imported by 915 packages. Updated 2019-08-24. Refresh now. Tools for package owners.