util

package
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 Go to latest Published: Jan 15, 2020 License: Apache-2.0 Imports: 50 Imported by: 0

Documentation

Overview

Package util implements various utility functions used in both testing and implementation of Kubernetes. Package util may not depend on any other package in the Kubernetes package tree.

Index

Constants

This section is empty.

Variables

View Source 
var ErrorHandlers = []func(error){logError}

ErrorHandlers is a list of functions which will be invoked when an unreturnable error occurs.

View Source 
var ForeverTestTimeout = time.Second * 30

For any test of the style: 

...
<- time.After(timeout):
   t.Errorf("Timed out")

The value for timeout should effectively be "forever." Obviously we don't want our tests to truly lock up forever, but 30s is long enough that it is effectively forever for the things that can slow down a run on a heavily contended machine (GC, seeks, etc), but not so long as to make a developer ctrl-c a test run if they do happen to break that test.

View Source 
var NeverStop <-chan struct{} = make(chan struct{})

NeverStop may be passed to Until to make it never stop.

View Source 
var PanicHandlers = []func(interface{}){logPanic}

PanicHandlers is a list of functions which will be invoked when a panic happens.

View Source 
var ReallyCrash bool

For testing, bypass HandleCrash.

Functions

func AllPtrFieldsNil 

func AllPtrFieldsNil(obj interface{}) bool

Tests whether all pointer fields in a struct are nil. This is useful when, for example, an API struct is handled by plugins which need to distinguish "no plugin accepted this spec" from "this spec is empty".

This function is only valid for structs and pointers to structs. Any other type will cause a panic. Passing a typed nil pointer will return true.

func ApplyRLimitForSelf 

func ApplyRLimitForSelf(maxOpenFiles uint64)

func CertPoolFromFile 

func CertPoolFromFile(filename string) (*x509.CertPool, error)

CertPoolFromFile returns an x509.CertPool containing the certificates in the given PEM-encoded file. Returns an error if the file could not be read, a certificate could not be parsed, or if the file does not contain any certificates

func CertsFromPEM 

func CertsFromPEM(pemCerts []byte) ([]*x509.Certificate, error)

CertsFromPEM returns the x509.Certificates contained in the given PEM-encoded byte array Returns an error if a certificate could not be parsed, or if the data does not contain any certificates

func ChooseHostInterface 

func ChooseHostInterface() (net.IP, error)

ChooseHostInterface is a method used fetch an IP for a daemon. It uses data from /proc/net/route file. For a node with no internet connection ,it returns error For a multi n/w interface node it returns the IP of the interface with gateway on it.

func CompileRegexps 

func CompileRegexps(regexpStrings []string) ([]*regexp.Regexp, error)

Takes a list of strings and compiles them into a list of regular expressions

func DeadlockWatchdog 

func DeadlockWatchdog(lock sync.Locker, name string, maxLockPeriod time.Duration)

func DeadlockWatchdogReadLock 

func DeadlockWatchdogReadLock(lock *sync.RWMutex, name string, maxLockPeriod time.Duration)

DeadlockWatchdogReadLock creates a watchdog on read/write mutex. If the mutex can not be acquired for read access within 'maxLockPeriod', the program exits via glog.Exitf() or os.Exit() if that fails 'name' is a semantic name that is useful for the user and is printed on exit.

func DeepHashObject 

func DeepHashObject(hasher hash.Hash, objectToWrite interface{})

DeepHashObject writes specified object to hash using the spew library which follows pointers and prints actual values of the nested objects ensuring the hash does not change when a pointer changes.

func EncodePrivateKey 

func EncodePrivateKey(private *rsa.PrivateKey) []byte

func EncodePublicKey 

func EncodePublicKey(public *rsa.PublicKey) ([]byte, error)

func EncodeSSHKey 

func EncodeSSHKey(public *rsa.PublicKey) ([]byte, error)

func EscapeQualifiedNameForDisk 

func EscapeQualifiedNameForDisk(in string) string

EscapeQualifiedNameForDisk converts a plugin name, which might contain a / into a string that is safe to use on-disk. This assumes that the input has already been validates as a qualified name. we use "~" rather than ":" here in case we ever use a filesystem that doesn't allow ":".

func ExecuteTemplate 

func ExecuteTemplate(w io.Writer, templateText string, data interface{}) error

ExecuteTemplate executes templateText with data and output written to w.

func ExecuteTemplateToString 

func ExecuteTemplateToString(templateText string, data interface{}) (string, error)

func FileExists 

func FileExists(filename string) (bool, error)

func FlushLogs 

func FlushLogs()

FlushLogs flushes logs immediately.

func Forever 

func Forever(f func(), period time.Duration)

Forever is syntactic sugar on top of Until

func GenerateKey 

func GenerateKey(bits int) (*rsa.PrivateKey, *rsa.PublicKey, error)

func GenerateSelfSignedCert 

func GenerateSelfSignedCert(host, certPath, keyPath string, alternateIPs []net.IP, alternateDNS []string) error

GenerateSelfSignedCert creates a self-signed certificate and key for the given host. Host may be an IP or a DNS name You may also specify additional subject alt names (either ip or dns names) for the certificate The certificate will be created with file mode 0644. The key will be created with file mode 0600. If the certificate or key files already exist, they will be overwritten. Any parent directories of the certPath or keyPath will be created as needed with file mode 0755.

func GetClient 

func GetClient(req *http.Request) string

func GetIntOrPercentValue 

func GetIntOrPercentValue(intOrStr *intstr.IntOrString) (int, bool, error)

func GetValueFromPercent 

func GetValueFromPercent(percent int, value int) int

func HandleCrash 

func HandleCrash(additionalHandlers ...func(interface{}))

HandleCrash simply catches a crash and logs an error. Meant to be called via defer. Additional context-specific handlers can be provided, and will be called in case of panic

func HandleError 

func HandleError(err error)

HandlerError is a method to invoke when a non-user facing piece of code cannot return an error and needs to indicate it has been ignored. Invoking this method is preferable to logging the error - the default behavior is to log but the errors may be sent to a remote server for analysis.

func InitFlags 

func InitFlags()

InitFlags normalizes and parses the command line flags

func InitLogs 

func InitLogs()

InitLogs initializes logs the way we want for kubernetes.

func IsProbableEOF 

func IsProbableEOF(err error) bool

IsProbableEOF returns true if the given error resembles a connection termination scenario that would justify assuming that the watch is empty. These errors are what the Go http stack returns back to us which are general connection closure errors (strongly correlated) and callers that need to differentiate probable errors in connection behavior between normal "this is disconnected" should use the method.

func JoinQualifiedName 

func JoinQualifiedName(namespace, name string) string

Joins 'namespace' and 'name' and returns a fully qualified name Assumes that the input is valid.

func JoinSchemeNamePort 

func JoinSchemeNamePort(scheme, name, port string) string

JoinSchemeNamePort returns a string that specifies the scheme, name, and port:

  • "<name>"
  • "<name>:<port>"
  • "<scheme>:<name>:<port>"

None of the parameters may contain a ':' character Name is required Scheme must be "", "http", or "https"

func MakePrivateKeySignerFromBytes 

func MakePrivateKeySignerFromBytes(buffer []byte) (ssh.Signer, error)

func MakePrivateKeySignerFromFile 

func MakePrivateKeySignerFromFile(key string) (ssh.Signer, error)

func NewCRLFWriter 

func NewCRLFWriter(w io.Writer) io.Writer

NewCRLFWriter implements a CR/LF line ending writer used for normalizing text for Windows platforms.

func NewLogger 

func NewLogger(prefix string) *log.Logger

NewLogger creates a new log.Logger which sends logs to glog.Info.

func NewUUID 

func NewUUID() types.UID

*

  • The UUID package is naive and can generate identical UUIDs if the time interval is quick enough.
  • Block subsequent UUIDs for 200 Nanoseconds, the UUID uses 100 ns increments, we block for 200 to be safe
  • Blocks in a go routine, so that the caller doesn't have to wait.
  • TODO: save old unused UUIDs so that no one has to block.

func ObjectDiff 

func ObjectDiff(a, b interface{}) string

ObjectDiff writes the two objects out as JSON and prints out the identical part of the objects followed by the remaining part of 'a' and finally the remaining part of 'b'. For debugging tests.

func ObjectGoPrintDiff 

func ObjectGoPrintDiff(a, b interface{}) string

ObjectGoPrintDiff is like ObjectDiff, but uses go-spew to print the objects, which shows absolutely everything by recursing into every single pointer (go's %#v formatters OTOH stop at a certain point). This is needed when you can't figure out why reflect.DeepEqual is returning false and nothing is showing you differences. This will.

func ObjectGoPrintSideBySide 

func ObjectGoPrintSideBySide(a, b interface{}) string

ObjectGoPrintSideBySide prints a and b as textual dumps side by side, enabling easy visual scanning for mismatches.

func ParsePublicKeyFromFile 

func ParsePublicKeyFromFile(keyFile string) (*rsa.PublicKey, error)

func ReadDirNoExit 

func ReadDirNoExit(dirname string) ([]os.FileInfo, []error, error)

borrowed from ioutil.ReadDir ReadDir reads the directory named by dirname and returns a list of directory entries, minus those with lstat errors

func RunInResourceContainer 

func RunInResourceContainer(containerName string) error

Creates resource-only containerName if it does not already exist and moves the current process to it.

containerName must be an absolute container name.

func RunSSHCommand 

func RunSSHCommand(cmd, user, host string, signer ssh.Signer) (string, string, int, error)

RunSSHCommand returns the stdout, stderr, and exit code from running cmd on host as specific user, along with any SSH-level error. If user=="", it will default (like SSH) to os.Getenv("USER")

func SetTransportDefaults 

func SetTransportDefaults(t *http.Transport) *http.Transport

SetTransportDefaults applies the defaults from http.DefaultTransport for the Proxy, Dial, and TLSHandshakeTimeout fields if unset

func ShortenString 

func ShortenString(str string, n int) string

func SplitQualifiedName 

func SplitQualifiedName(str string) (string, string)

Splits a fully qualified name and returns its namespace and name. Assumes that the input 'str' has been validated.

func SplitSchemeNamePort 

func SplitSchemeNamePort(id string) (scheme, name, port string, valid bool)

SplitSchemeNamePort takes a string of the following forms:

  • "<name>", returns "", "<name>","", true
  • "<name>:<port>", returns "", "<name>","<port>",true
  • "<scheme>:<name>:<port>", returns "<scheme>","<name>","<port>",true

Name must be non-empty or valid will be returned false. Scheme must be "http" or "https" if specified Port is returned as a string, and it is not required to be numeric (could be used for a named port, for example).

func StringDiff 

func StringDiff(a, b string) string

StringDiff diffs a and b and returns a human readable diff.

func TLSClientConfig 

func TLSClientConfig(transport http.RoundTripper) (*tls.Config, error)

func Umask 

func Umask(mask int) (old int, err error)

func UnescapeQualifiedNameForDisk 

func UnescapeQualifiedNameForDisk(in string) string

UnescapeQualifiedNameForDisk converts an escaped plugin name (as per EscapeQualifiedNameForDisk) back to its normal form. This assumes that the input has already been validates as a qualified name.

func Until 

func Until(f func(), period time.Duration, stopCh <-chan struct{})

Until loops until stop channel is closed, running f every period. Catches any panics, and keeps going. f may not be invoked if stop channel is already closed. Pass NeverStop to Until if you don't want it stop.

func UsingSystemdInitSystem 

func UsingSystemdInitSystem() bool

Detects if using systemd as the init system Please note that simply reading /proc/1/cmdline can be misleading because some installation of various init programs can automatically make /sbin/init a symlink or even a renamed version of their main program. TODO(dchen1107): realiably detects the init system using on the system: systemd, upstart, initd, etc.

func ValidPublicAddrForMaster 

func ValidPublicAddrForMaster(bindAddress net.IP) (net.IP, error)

If bind-address is usable, return it directly If bind-address is not usable (unset, 0.0.0.0, or loopback), we will use the host's default interface.

func WarnWordSepNormalizeFunc 

func WarnWordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName

WarnWordSepNormalizeFunc changes and warns for flags that contain "_" separators

func WordSepNormalizeFunc 

func WordSepNormalizeFunc(f *pflag.FlagSet, name string) pflag.NormalizedName

WordSepNormalizeFunc changes all flags that contain "_" separators

Types

type Backoff 

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

func NewBackOff 

func NewBackOff(initial, max time.Duration) *Backoff

func (*Backoff) GC 

func (p *Backoff) GC()

Garbage collect records that have aged past maxDuration. Backoff users are expected to invoke this periodically.

func (*Backoff) Get 

func (p *Backoff) Get(id string) time.Duration

Get the current backoff Duration

func (*Backoff) IsInBackOffSince 

func (p *Backoff) IsInBackOffSince(id string, eventTime time.Time) bool

Returns True if the elapsed time since eventTime is smaller than the current backoff window

func (*Backoff) IsInBackOffSinceUpdate 

func (p *Backoff) IsInBackOffSinceUpdate(id string, eventTime time.Time) bool

Returns True if time since lastupdate is less than the current backoff window.

func (*Backoff) Next 

func (p *Backoff) Next(id string, eventTime time.Time)

move backoff to the next mark, capping at maxDuration

func (*Backoff) Reset 

func (p *Backoff) Reset(id string)

Reset forces clearing of all backoff data for a given key.

type BoolFlag 

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

BoolFlag is a boolean flag compatible with flags and pflags that keeps track of whether it had a value supplied or not. Beware! If you use this type, you must actually specify --flag-name=true, you cannot leave it as --flag-name and still have the value set

func (*BoolFlag) Default 

func (f *BoolFlag) Default(value bool)

func (BoolFlag) Provided 

func (f BoolFlag) Provided() bool

func (*BoolFlag) Set 

func (f *BoolFlag) Set(value string) error

func (BoolFlag) String 

func (f BoolFlag) String() string

func (*BoolFlag) Type 

func (f *BoolFlag) Type() string

func (BoolFlag) Value 

func (f BoolFlag) Value() bool

type Cache 

type Cache []*cacheShard

func NewCache 

func NewCache(maxSize int) Cache

func (*Cache) Add 

func (c *Cache) Add(index uint64, obj interface{}) bool

Returns true if object already existed, false otherwise.

func (*Cache) Get 

func (c *Cache) Get(index uint64) (obj interface{}, found bool)

type Clock 

type Clock interface {
	Now() time.Time
	Since(time.Time) time.Duration
}

Clock allows for injecting fake or real clocks into code that needs to do arbitrary things based on time.

type ConfigurationMap 

type ConfigurationMap map[string]string

func (*ConfigurationMap) Set 

func (m *ConfigurationMap) Set(value string) error

func (*ConfigurationMap) String 

func (m *ConfigurationMap) String() string

func (*ConfigurationMap) Type 

func (*ConfigurationMap) Type() string

type DialFunc 

type DialFunc func(net, addr string) (net.Conn, error)

func Dialer 

func Dialer(transport http.RoundTripper) (DialFunc, error)

type FakeClock 

type FakeClock struct {
	Time time.Time
}

FakeClock implements Clock, but returns an arbitrary time.

func (*FakeClock) Now 

func (f *FakeClock) Now() time.Time

Now returns f's time.

func (*FakeClock) Since 

func (f *FakeClock) Since(ts time.Time) time.Duration

Since returns time since the time in f.

func (*FakeClock) Step 

func (f *FakeClock) Step(d time.Duration)

Move clock by Duration

type FakeHandler 

type FakeHandler struct {
	RequestReceived *http.Request
	RequestBody     string
	StatusCode      int
	ResponseBody    string
	// For logging - you can use a *testing.T
	// This will keep log messages associated with the test.
	T LogInterface
	// contains filtered or unexported fields
}

FakeHandler is to assist in testing HTTP requests. Notice that FakeHandler is not thread safe and you must not direct traffic to except for the request you want to test. You can do this by hiding it in an http.ServeMux.

func (*FakeHandler) ServeHTTP 

func (f *FakeHandler) ServeHTTP(response http.ResponseWriter, request *http.Request)

func (*FakeHandler) ValidateRequest 

func (f *FakeHandler) ValidateRequest(t TestInterface, expectedPath, expectedMethod string, body *string)

ValidateRequest verifies that FakeHandler received a request with expected path, method, and body.

func (*FakeHandler) ValidateRequestCount 

func (f *FakeHandler) ValidateRequestCount(t TestInterface, count int) bool

type GlogWriter 

type GlogWriter struct{}

GlogWriter serves as a bridge between the standard log package and the glog package.

func (GlogWriter) Write 

func (writer GlogWriter) Write(data []byte) (n int, err error)

Write implements the io.Writer interface.

type IntervalClock 

type IntervalClock struct {
	Time     time.Time
	Duration time.Duration
}

IntervalClock implements Clock, but each invocation of Now steps the clock forward the specified duration

func (*IntervalClock) Now 

func (i *IntervalClock) Now() time.Time

Now returns i's time.

func (*IntervalClock) Since 

func (i *IntervalClock) Since(ts time.Time) time.Duration

Since returns time since the time in i.

type LineDelimiter 

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

A Line Delimiter is a filter that will

func NewLineDelimiter 

func NewLineDelimiter(output io.Writer, delimiter string) *LineDelimiter

NewLineDelimiter allocates a new io.Writer that will split input on lines and bracket each line with the delimiter string. This can be useful in output tests where it is difficult to see and test trailing whitespace.

func (*LineDelimiter) Flush 

func (ld *LineDelimiter) Flush() (err error)

Flush all lines up until now. This will assume insert a linebreak at the current point of the stream.

func (*LineDelimiter) Write 

func (ld *LineDelimiter) Write(buf []byte) (n int, err error)

Write writes buf to the LineDelimiter ld. The only errors returned are ones encountered while writing to the underlying output stream.

type LogInterface 

type LogInterface interface {
	Logf(format string, args ...interface{})
}

LogInterface is a simple interface to allow injection of Logf to report serving errors.

type PortRange 

type PortRange struct {
	Base int
	Size int
}

PortRange represents a range of TCP/UDP ports. To represent a single port, set Size to 1.

func ParsePortRange 

func ParsePortRange(value string) (*PortRange, error)

ParsePortRange parses a string of the form "min-max", inclusive at both ends, and initializs a new PortRange from it.

func (*PortRange) Contains 

func (pr *PortRange) Contains(p int) bool

Contains tests whether a given port falls within the PortRange.

func (*PortRange) Set 

func (pr *PortRange) Set(value string) error

Set parses a string of the form "min-max", inclusive at both ends, and sets the PortRange from it. This is part of the flag.Value and pflag.Value interfaces.

func (PortRange) String 

func (pr PortRange) String() string

String converts the PortRange to a string representation, which can be parsed by PortRange.Set or ParsePortRange.

func (*PortRange) Type 

func (*PortRange) Type() string

Type returns a descriptive string about this type. This is part of the pflag.Value interface.

type RateLimiter 

type RateLimiter interface {
	// TryAccept returns true if a token is taken immediately. Otherwise,
	// it returns false.
	TryAccept() bool
	// Accept returns once a token becomes available.
	Accept()
	// Stop stops the rate limiter, subsequent calls to CanAccept will return false
	Stop()
	// Saturation returns a percentage number which describes how saturated
	// this rate limiter is.
	// Usually we use token bucket rate limiter. In that case,
	// 1.0 means no tokens are available; 0.0 means we have a full bucket of tokens to use.
	Saturation() float64
}

func NewFakeRateLimiter 

func NewFakeRateLimiter() RateLimiter

func NewTokenBucketRateLimiter 

func NewTokenBucketRateLimiter(qps float32, burst int) RateLimiter

NewTokenBucketRateLimiter creates a rate limiter which implements a token bucket approach. The rate limiter allows bursts of up to 'burst' to exceed the QPS, while still maintaining a smoothed qps rate of 'qps'. The bucket is initially filled with 'burst' tokens, and refills at a rate of 'qps'. The maximum number of tokens in the bucket is capped at 'burst'.

type RealClock 

type RealClock struct{}

RealClock really calls time.Now()

func (RealClock) Now 

func (r RealClock) Now() time.Time

Now returns the current time.

func (RealClock) Since 

func (r RealClock) Since(ts time.Time) time.Duration

Since returns time since the specified timestamp.

type RoundTripperWrapper 

type RoundTripperWrapper interface {
	http.RoundTripper
	WrappedRoundTripper() http.RoundTripper
}

type Route 

type Route struct {
	Interface   string
	Destination net.IP
	Gateway     net.IP
}

type Runner 

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

Runner is an abstraction to make it easy to start and stop groups of things that can be described by a single function which waits on a channel close to exit.

func NewRunner 

func NewRunner(f ...func(stop chan struct{})) *Runner

NewRunner makes a runner for the given function(s). The function(s) should loop until the channel is closed.

func (*Runner) Start 

func (r *Runner) Start()

Start begins running.

func (*Runner) Stop 

func (r *Runner) Stop()

Stop stops running.

type SSHTunnel 

type SSHTunnel struct {
	Config  *ssh.ClientConfig
	Host    string
	SSHPort string
	// contains filtered or unexported fields
}

TODO: Unit tests for this code, we can spin up a test SSH server with instructions here: https://godoc.org/golang.org/x/crypto/ssh#ServerConn

func NewSSHTunnel 

func NewSSHTunnel(user, keyfile, host string) (*SSHTunnel, error)

func NewSSHTunnelFromBytes 

func NewSSHTunnelFromBytes(user string, privateKey []byte, host string) (*SSHTunnel, error)

func (*SSHTunnel) Close 

func (s *SSHTunnel) Close() error

func (*SSHTunnel) Dial 

func (s *SSHTunnel) Dial(network, address string) (net.Conn, error)

func (*SSHTunnel) Open 

func (s *SSHTunnel) Open() error

type SSHTunnelEntry 

type SSHTunnelEntry struct {
	Address string
	Tunnel  *SSHTunnel
}

Should be thread safe.

type SSHTunnelList 

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

Not thread safe!

func MakeSSHTunnels 

func MakeSSHTunnels(user, keyfile string, addresses []string) *SSHTunnelList

func (*SSHTunnelList) Close 

func (l *SSHTunnelList) Close()

Close asynchronously closes all tunnels in the list after waiting for 1 minute. Tunnels will still be open upon this function's return, but should no longer be used.

func (*SSHTunnelList) Has 

func (l *SSHTunnelList) Has(addr string) bool

func (*SSHTunnelList) Len 

func (l *SSHTunnelList) Len() int

func (*SSHTunnelList) Open 

func (l *SSHTunnelList) Open() error

Open attempts to open all tunnels in the list, and removes any tunnels that failed to open.

func (*SSHTunnelList) PickRandomTunnel 

func (l *SSHTunnelList) PickRandomTunnel() (SSHTunnelEntry, error)

Returns a random tunnel, xor an error if there are none.

type StringFlag 

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

StringFlag is a string flag compatible with flags and pflags that keeps track of whether it had a value supplied or not.

func NewStringFlag 

func NewStringFlag(defaultVal string) StringFlag

func (*StringFlag) Default 

func (f *StringFlag) Default(value string)

func (StringFlag) Provided 

func (f StringFlag) Provided() bool

func (*StringFlag) Set 

func (f *StringFlag) Set(value string) error

func (StringFlag) String 

func (f StringFlag) String() string

func (*StringFlag) Type 

func (f *StringFlag) Type() string

func (StringFlag) Value 

func (f StringFlag) Value() string

type TestInterface 

type TestInterface interface {
	Errorf(format string, args ...interface{})
	Logf(format string, args ...interface{})
}

TestInterface is a simple interface providing Errorf, to make injection for testing easier (insert 'yo dawg' meme here).

type Trace 

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

func NewTrace 

func NewTrace(name string) *Trace

func (*Trace) Log 

func (t *Trace) Log()

func (*Trace) LogIfLong 

func (t *Trace) LogIfLong(threshold time.Duration)

func (*Trace) Step 

func (t *Trace) Step(msg string)

func (*Trace) TotalTime 

func (t *Trace) TotalTime() time.Duration

Source Files

View all Source files

Directories

Path Synopsis
Package bandwidth provides utilities for bandwidth shaping
 Package bandwidth provides utilities for bandwidth shaping
Package chown provides an interface and implementations for things that run run the chmod system call.
 Package chown provides an interface and implementations for things that run run the chmod system call.
Package chown provides utilities to chown a path
 Package chown provides utilities to chown a path
Package config provides utility objects for decoupling sources of configuration and the actual configuration state.
 Package config provides utility objects for decoupling sources of configuration and the actual configuration state.
Package dbus provides an injectable interface and implementations for D-Bus communication
 Package dbus provides an injectable interface and implementations for D-Bus communication
Package errors implements various utility functions and types around errors.
 Package errors implements various utility functions and types around errors.
Package exec provides an injectable interface and implementations for running commands.
 Package exec provides an injectable interface and implementations for running commands.
Package flushwriter implements a wrapper for a writer that flushes on every write if that writer implements the io.Flusher interface
 Package flushwriter implements a wrapper for a writer that flushes on every write if that writer implements the io.Flusher interface
Package httpstream adds multiplexed streaming support to HTTP requests and responses via connection upgrades.
 Package httpstream adds multiplexed streaming support to HTTP requests and responses via connection upgrades.
spdy
Package iptables provides an interface and implementations for running iptables commands.
 Package iptables provides an interface and implementations for running iptables commands.
testing
package jsonpath is a template engine using jsonpath syntax, which can be seen at http://goessner.net/articles/JsonPath/.
 package jsonpath is a template engine using jsonpath syntax, which can be seen at http://goessner.net/articles/JsonPath/.
Package limitwriter provides a writer that only allows a certain number of bytes to be written.
 Package limitwriter provides a writer that only allows a certain number of bytes to be written.
Package mount defines an interface to mounting filesystems.
 Package mount defines an interface to mounting filesystems.
Package oom implements utility functions relating to out of memory management.
 Package oom implements utility functions relating to out of memory management.
Package procfs implements utility functions relating to the /proc mount.
 Package procfs implements utility functions relating to the /proc mount.
Package proxy provides transport and upgrade support for proxies
 Package proxy provides transport and upgrade support for proxies
Package rand provides utilities related to randomization.
 Package rand provides utilities related to randomization.
Package selinux contains selinux utility functions.
 Package selinux contains selinux utility functions.
Package sets has auto-generated set types.
 Package sets has auto-generated set types.
types
Package types just provides input types to the set generator.
 Package types just provides input types to the set generator.
Package slice provides utility methods for common operations on slices.
 Package slice provides utility methods for common operations on slices.
field
Package wait provides tools for polling or listening for changes to a condition.
 Package wait provides tools for polling or listening for changes to a condition.
Package workqueue provides a simple queue that supports the following features:
 Package workqueue provides a simple queue that supports the following features:
Package wsstream contains utilities for streaming content over WebSockets.
 Package wsstream contains utilities for streaming content over WebSockets.

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