util

package
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Published: Nov 27, 2014 License: Apache-2.0 Imports: 17 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 ReallyCrash bool

For testing, bypass HandleCrash.

Functions

func CompileRegexps

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

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

func FlushLogs

func FlushLogs()

FlushLogs flushes logs immediately.

func Forever

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

Forever loops forever running f every d. Catches any panics, and keeps going.

func HandleCrash

func HandleCrash()

HandleCrash simply catches a crash and logs an error. Meant to be called via defer.

func InitLogs

func InitLogs()

InitLogs initializes logs the way we want for kubernetes.

func IsCIdentifier

func IsCIdentifier(value string) bool

IsCIdentifier tests for a string that conforms the definition of an identifier in C. This checks the format, but not the length.

func IsDNS952Label

func IsDNS952Label(value string) bool

func IsDNSLabel

func IsDNSLabel(value string) bool

IsDNSLabel tests for a string that conforms to the definition of a label in DNS (RFC 1035/1123).

func IsDNSSubdomain

func IsDNSSubdomain(value string) bool

IsDNSSubdomain tests for a string that conforms to the definition of a subdomain in DNS (RFC 1035/1123).

func IsValidPortNum

func IsValidPortNum(port int) bool

IsValidPortNum tests that the argument is a valid, non-zero port number.

func NewLogger

func NewLogger(prefix string) *log.Logger

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

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's %#v formatter to print the objects, in case json isn't showing you the difference. (reflect.DeepEqual makes a distinction between nil and empty slices, for example, even though nothing else really does.)

func StringDiff

func StringDiff(a, b string) string

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

Types

type ErrorList

type ErrorList []error

ErrorList is a collection of errors. This does not implement the error interface to avoid confusion where an empty ErrorList would still be an error (non-nil). To produce a single error instance from an ErrorList, use the ToError() method, which will return nil for an empty ErrorList.

func (ErrorList) ToError

func (list ErrorList) ToError() error

ToError converts an ErrorList into a "normal" error, or nil if the list is empty.

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.

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 IP

type IP net.IP

IP adapts net.IP for use as a flag.

func (*IP) Set

func (ip *IP) Set(value string) error

func (IP) String

func (ip IP) String() string

type IPNet

type IPNet net.IPNet

IPNet adapts net.IPNet for use as a flag.

func (*IPNet) Set

func (ipnet *IPNet) Set(value string) error

func (IPNet) String

func (ipnet IPNet) String() string

type IntOrString

type IntOrString struct {
	Kind   IntstrKind
	IntVal int
	StrVal string
}

IntOrString is a type that can hold an int or a string. When used in JSON or YAML marshalling and unmarshalling, it produces or consumes the inner type. This allows you to have, for example, a JSON field that can accept a name or number.

func NewIntOrStringFromInt

func NewIntOrStringFromInt(val int) IntOrString

NewIntOrStringFromInt creates an IntOrString object with an int value.

func NewIntOrStringFromString

func NewIntOrStringFromString(val string) IntOrString

NewIntOrStringFromString creates an IntOrString object with a string value.

func (IntOrString) GetYAML

func (intstr IntOrString) GetYAML() (tag string, value interface{})

GetYAML implements the yaml.Getter interface.

func (IntOrString) MarshalJSON

func (intstr IntOrString) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaller interface.

func (*IntOrString) SetYAML

func (intstr *IntOrString) SetYAML(tag string, value interface{}) bool

SetYAML implements the yaml.Setter interface.

func (*IntOrString) UnmarshalJSON

func (intstr *IntOrString) UnmarshalJSON(value []byte) error

UnmarshalJSON implements the json.Unmarshaller interface.

type IntstrKind

type IntstrKind int

IntstrKind represents the stored type of IntOrString.

const (
	IntstrInt    IntstrKind = iota // The IntOrString holds an int.
	IntstrString                   // The IntOrString holds a string.
)

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 RateLimiter

type RateLimiter interface {
	// CanAccept returns true if the rate is below the limit, false otherwise
	CanAccept() bool
	// Stop stops the rate limiter, subsequent calls to CanAccept will return false
	Stop()
}

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, the rate limiter spawns a go routine which refills the bucket with one token at a rate of 'qps'. The maximum number of tokens in the bucket is capped at 'burst'. When done with the limiter, Stop() must be called to halt the associated goroutine.

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 StringList

type StringList []string

func (*StringList) Set

func (sl *StringList) Set(value string) error

func (*StringList) String

func (sl *StringList) String() string

type StringSet

type StringSet map[string]empty

StringSet is a set of strings, implemented via map[string]struct{} for minimal memory consumption.

func NewStringSet

func NewStringSet(items ...string) StringSet

NewStringSet creates a StringSet from a list of values.

func (StringSet) Delete

func (s StringSet) Delete(item string)

Delete removes item from the set.

func (StringSet) Has

func (s StringSet) Has(item string) bool

Has returns true iff item is contained in the set.

func (StringSet) HasAll

func (s StringSet) HasAll(items ...string) bool

HasAll returns true iff all items are contained in the set.

func (StringSet) Insert

func (s StringSet) Insert(items ...string)

Insert adds items to the set.

func (StringSet) IsSuperset

func (s1 StringSet) IsSuperset(s2 StringSet) bool

IsSuperset returns true iff s1 is a superset of s2.

func (StringSet) Len

func (s StringSet) Len() int

Len returns the size of the set.

func (StringSet) List

func (s StringSet) List() []string

List returns the contents as a sorted string slice.

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 Time

type Time struct {
	time.Time
}

Time is a wrapper around time.Time which supports correct marshaling to YAML and JSON. Wrappers are provided for many of the factory methods that the time package offers.

func Date

func Date(year int, month time.Month, day, hour, min, sec, nsec int, loc *time.Location) Time

Date returns the Time corresponding to the supplied parameters by wrapping time.Date.

func Now

func Now() Time

Now returns the current local time.

func Unix

func Unix(sec int64, nsec int64) Time

Unix returns the local time corresponding to the given Unix time by wrapping time.Unix.

func (Time) GetYAML

func (t Time) GetYAML() (tag string, value interface{})

GetYAML implements the yaml.Getter interface.

func (Time) MarshalJSON

func (t Time) MarshalJSON() ([]byte, error)

MarshalJSON implements the json.Marshaler interface.

func (Time) Rfc3339Copy

func (t Time) Rfc3339Copy() Time

Rfc3339Copy returns a copy of the Time at second-level precision.

func (*Time) SetYAML

func (t *Time) SetYAML(tag string, value interface{}) bool

SetYAML implements the yaml.Setter interface.

func (*Time) UnmarshalJSON

func (t *Time) UnmarshalJSON(b []byte) error

UnmarshalJSON implements the json.Unmarshaller interface.

type UUID

type UUID interface {
	String() string
}

func NewUUID

func NewUUID() UUID

*

  • 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.

Directories

Path Synopsis
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 exec provides an injectable interface and implementations for running commands.
Package exec provides an injectable interface and implementations for running commands.
Package iptables provides an interface and implementations for running iptables commands.
Package iptables provides an interface and implementations for running iptables commands.
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.

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