utils

package
v0.6.4-0...-2d425af Latest Latest
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 Go to latest Published: Oct 7, 2013 License: Apache-2.0 Imports: 25 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	StdWriterPrefixLen = 8
	StdWriterFdIndex   = 0
	StdWriterSizeIndex = 4
)

Variables

View Source 
var ErrInvalidStdHeader = errors.New("Unrecognized input header")

Functions

func CheckLocalDns 

func CheckLocalDns(resolvConf []byte) bool

CheckLocalDns looks into the /etc/resolv.conf, it returns true if there is a local nameserver or if there is no nameserver.

func CompareKernelVersion 

func CompareKernelVersion(a, b *KernelVersionInfo) int

Compare two KernelVersionInfo struct. Returns -1 if a < b, = if a == b, 1 it a > b

func CopyDirectory 

func CopyDirectory(source, dest string) error

FIXME: this is deprecated by CopyWithTar in archive.go

func CopyEscapable 

func CopyEscapable(dst io.Writer, src io.ReadCloser) (written int64, err error)

Code c/c from io.Copy() modified to handle escape sequence

func Debugf 

func Debugf(format string, a ...interface{})

Debug function, if the debug flag is set, then display. Do nothing otherwise If Docker is in damon mode, also send the debug info on the socket

func DisplayJSONMessagesStream 

func DisplayJSONMessagesStream(in io.Reader, out io.Writer) error

func Download 

func Download(url string, stderr io.Writer) (*http.Response, error)

Request a given URL and return an io.Reader

func FindCgroupMountpoint 

func FindCgroupMountpoint(cgroupType string) (string, error)

func GetReleaseVersion 

func GetReleaseVersion() string

func GetResolvConf 

func GetResolvConf() ([]byte, error)

GetResolvConf opens and read the content of /etc/resolv.conf. It returns it as byte slice.

func GetTotalUsedFds 

func GetTotalUsedFds() int

func Go 

func Go(f func() error) chan error

Go is a basic promise implementation: it wraps calls a function in a goroutine, and returns a channel which will later return the function's return value.

func HashData 

func HashData(src io.Reader) (string, error)

func HumanDuration 

func HumanDuration(d time.Duration) string

HumanDuration returns a human-readable approximation of a duration (eg. "About a minute", "4 hours ago", etc.)

func HumanSize 

func HumanSize(size int64) string

HumanSize returns a human-readable approximation of a size using SI standard (eg. "44kB", "17MB")

func IsGIT 

func IsGIT(str string) bool

func IsURL 

func IsURL(str string) bool

func NewBufReader 

func NewBufReader(r io.Reader) *bufReader

func NewHTTPRequestError 

func NewHTTPRequestError(msg string, res *http.Response) error

func NopWriteCloser 

func NopWriteCloser(w io.Writer) io.WriteCloser

func ParseHost 

func ParseHost(host string, port int, addr string) string

func ParseRepositoryTag 

func ParseRepositoryTag(repos string) (string, string)

Get a repos name and returns the right reposName + tag The tag can be confusing because of a port in a repository name. 

Ex: localhost.localdomain:5000/samalba/hipache:latest

func ProgressReader 

func ProgressReader(r io.ReadCloser, size int, output io.Writer, tpl []byte, sf *StreamFormatter, newline bool) *progressReader

func SelfPath 

func SelfPath() string

Figure out the absolute path of our own binary

func StdCopy 

func StdCopy(dstout, dsterr io.Writer, src io.Reader) (written int64, err error)

StdCopy is a modified version of io.Copy.

StdCopy copies from src to dstout or dsterr until either EOF is reached on src or an error occurs. It returns the number of bytes copied and the first error encountered while copying, if any.

A successful Copy returns err == nil, not err == EOF. Because Copy is defined to read from src until EOF, it does not treat an EOF from Read as an error to be reported.

The source needs to be writter via StdWriter, dstout or dsterr is selected based on the prefix added by StdWriter

func StripComments 

func StripComments(input []byte, commentMarker []byte) []byte

StripComments parses input into lines and strips away comments.

func Trunc 

func Trunc(s string, maxlen int) string

func TruncateID 

func TruncateID(id string) string

TruncateID returns a shorthand version of a string identifier for convenience. A collision with other shorthands is very unlikely, but possible. In case of a collision a lookup with TruncIndex.Get() will fail, and the caller will need to use a langer prefix, or the full-length Id.

Types

type DependencyGraph 

type DependencyGraph struct {
	// contains filtered or unexported fields
}

func NewDependencyGraph 

func NewDependencyGraph() DependencyGraph

func (*DependencyGraph) AddDependency 

func (graph *DependencyGraph) AddDependency(node, to string) error

func (*DependencyGraph) GenerateTraversalMap 

func (graph *DependencyGraph) GenerateTraversalMap() ([][]string, error)

The magic happens here ::

func (*DependencyGraph) NewNode 

func (graph *DependencyGraph) NewNode(id string) string

type DependencyNode 

type DependencyNode struct {
	// contains filtered or unexported fields
}

func (*DependencyNode) Degree 

func (node *DependencyNode) Degree() int

type HTTPMetaHeadersDecorator 

type HTTPMetaHeadersDecorator struct {
	Headers map[string][]string
}

func (*HTTPMetaHeadersDecorator) ChangeRequest 

func (self *HTTPMetaHeadersDecorator) ChangeRequest(req *http.Request) (newReq *http.Request, err error)

type HTTPRequestDecorator 

type HTTPRequestDecorator interface {
	// ChangeRequest() changes the request accordingly.
	// The changed request will be returned or err will be non-nil
	// if an error occur.
	ChangeRequest(req *http.Request) (newReq *http.Request, err error)
}

HTTPRequestDecorator is used to change an instance of http.Request. It could be used to add more header fields, change body, etc.

func NewHTTPUserAgentDecorator 

func NewHTTPUserAgentDecorator(versions ...VersionInfo) HTTPRequestDecorator

type HTTPRequestFactory 

type HTTPRequestFactory struct {
	// contains filtered or unexported fields
}

HTTPRequestFactory creates an HTTP request and applies a list of decorators on the request.

func NewHTTPRequestFactory 

func NewHTTPRequestFactory(d ...HTTPRequestDecorator) *HTTPRequestFactory

func (*HTTPRequestFactory) NewRequest 

func (self *HTTPRequestFactory) NewRequest(method, urlStr string, body io.Reader, d ...HTTPRequestDecorator) (*http.Request, error)

NewRequest() creates a new *http.Request, applies all decorators in the HTTPRequestFactory on the request, then applies decorators provided by d on the request.

type HTTPUserAgentDecorator 

type HTTPUserAgentDecorator struct {
	// contains filtered or unexported fields
}

HTTPUserAgentDecorator appends the product/version to the user agent field of a request.

func (*HTTPUserAgentDecorator) ChangeRequest 

func (self *HTTPUserAgentDecorator) ChangeRequest(req *http.Request) (newReq *http.Request, err error)

type JSONError 

type JSONError struct {
	Code    int    `json:"code,omitempty"`
	Message string `json:"message,omitempty"`
}

func (*JSONError) Error 

func (e *JSONError) Error() string

type JSONLog 

type JSONLog struct {
	Log     string    `json:"log,omitempty"`
	Stream  string    `json:"stream,omitempty"`
	Created time.Time `json:"time"`
}

type JSONMessage 

type JSONMessage struct {
	Status       string     `json:"status,omitempty"`
	Progress     string     `json:"progress,omitempty"`
	ErrorMessage string     `json:"error,omitempty"` //deprecated
	ID           string     `json:"id,omitempty"`
	From         string     `json:"from,omitempty"`
	Time         int64      `json:"time,omitempty"`
	Error        *JSONError `json:"errorDetail,omitempty"`
}

func (*JSONMessage) Display 

func (jm *JSONMessage) Display(out io.Writer) error

type KernelVersionInfo 

type KernelVersionInfo struct {
	Kernel int
	Major  int
	Minor  int
	Flavor string
}

func GetKernelVersion 

func GetKernelVersion() (*KernelVersionInfo, error)

func ParseRelease 

func ParseRelease(release string) (*KernelVersionInfo, error)

func (*KernelVersionInfo) String 

func (k *KernelVersionInfo) String() string

type NopFlusher 

type NopFlusher struct{}

func (*NopFlusher) Flush 

func (f *NopFlusher) Flush()

type NopWriter 

type NopWriter struct{}

func (*NopWriter) Write 

func (*NopWriter) Write(buf []byte) (int, error)

type StatusError 

type StatusError struct {
	Status int
}

An StatusError reports an unsuccessful exit by a command.

func (*StatusError) Error 

func (e *StatusError) Error() string

type StdType 

type StdType [StdWriterPrefixLen]byte
var (
	Stdin  StdType = StdType{0: 0}
	Stdout StdType = StdType{0: 1}
	Stderr StdType = StdType{0: 2}
)

type StdWriter 

type StdWriter struct {
	io.Writer
	// contains filtered or unexported fields
}

func NewStdWriter 

func NewStdWriter(w io.Writer, t StdType) *StdWriter

NewStdWriter instanciate a new Writer based on the given type `t`. the utils package contains the valid parametres for `t`:

func (*StdWriter) Write 

func (w *StdWriter) Write(buf []byte) (n int, err error)

type StreamFormatter 

type StreamFormatter struct {
	// contains filtered or unexported fields
}

func NewStreamFormatter 

func NewStreamFormatter(json bool) *StreamFormatter

func (*StreamFormatter) FormatError 

func (sf *StreamFormatter) FormatError(err error) []byte

func (*StreamFormatter) FormatProgress 

func (sf *StreamFormatter) FormatProgress(id, action, progress string) []byte

func (*StreamFormatter) FormatStatus 

func (sf *StreamFormatter) FormatStatus(id, format string, a ...interface{}) []byte

func (*StreamFormatter) Used 

func (sf *StreamFormatter) Used() bool

type StreamWriter 

type StreamWriter struct {
	// contains filtered or unexported fields
}

type TarSum 

type TarSum struct {
	io.Reader
	// contains filtered or unexported fields
}

func (*TarSum) Read 

func (ts *TarSum) Read(buf []byte) (int, error)

func (*TarSum) Sum 

func (ts *TarSum) Sum(extra []byte) string

type TruncIndex 

type TruncIndex struct {
	// contains filtered or unexported fields
}

TruncIndex allows the retrieval of string identifiers by any of their unique prefixes. This is used to retrieve image and container IDs by more convenient shorthand prefixes.

func NewTruncIndex 

func NewTruncIndex() *TruncIndex

func (*TruncIndex) Add 

func (idx *TruncIndex) Add(id string) error

func (*TruncIndex) Delete 

func (idx *TruncIndex) Delete(id string) error

func (*TruncIndex) Get 

func (idx *TruncIndex) Get(s string) (string, error)

type User 

type User struct {
	Uid      string // user id
	Gid      string // primary group id
	Username string
	Name     string
	HomeDir  string
}

func UserLookup 

func UserLookup(uid string) (*User, error)

UserLookup check if the given username or uid is present in /etc/passwd and returns the user struct. If the username is not found, an error is returned.

type Utsname 

type Utsname syscall.Utsname

type VersionInfo 

type VersionInfo interface {
	Name() string
	Version() string
}

VersionInfo is used to model entities which has a version. It is basically a tupple with name and version.

type WriteBroadcaster 

type WriteBroadcaster struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewWriteBroadcaster 

func NewWriteBroadcaster() *WriteBroadcaster

func (*WriteBroadcaster) AddWriter 

func (w *WriteBroadcaster) AddWriter(writer io.WriteCloser, stream string)

func (*WriteBroadcaster) CloseWriters 

func (w *WriteBroadcaster) CloseWriters() error

func (*WriteBroadcaster) Write 

func (w *WriteBroadcaster) Write(p []byte) (n int, err error)

type WriteFlusher 

type WriteFlusher struct {
	sync.Mutex
	// contains filtered or unexported fields
}

func NewWriteFlusher 

func NewWriteFlusher(w io.Writer) *WriteFlusher

func (*WriteFlusher) Write 

func (wf *WriteFlusher) Write(b []byte) (n int, err error)

Source Files

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