Documentation
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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 ¶
- Variables
- func CompileRegexps(regexpStrings []string) ([]*regexp.Regexp, error)
- func EncodeJSON(obj interface{}) string
- func FlushLogs()
- func Forever(f func(), period time.Duration)
- func HandleCrash()
- func InitLogs()
- func IsCIdentifier(value string) bool
- func IsDNS952Label(value string) bool
- func IsDNSLabel(value string) bool
- func IsDNSSubdomain(value string) bool
- func IsValidPortNum(port int) bool
- func NewLogger(prefix string) *log.Logger
- func ObjectDiff(a, b interface{}) string
- func ObjectGoPrintDiff(a, b interface{}) string
- func StringDiff(a, b string) string
- type ErrorList
- type FakeHandler
- type GlogWriter
- type IP
- type IPNet
- type IntOrString
- type IntstrKind
- type LogInterface
- type RateLimiter
- type Runner
- type StringList
- type StringSet
- type TestInterface
- type Time
- type UUID
Constants ¶
This section is empty.
Variables ¶
var ReallyCrash bool
For testing, bypass HandleCrash.
Functions ¶
func CompileRegexps ¶
Takes a list of strings and compiles them into a list of regular expressions
func EncodeJSON ¶
func EncodeJSON(obj interface{}) string
EncodeJSON returns obj marshalled as a JSON string, ignoring any errors.
func HandleCrash ¶
func HandleCrash()
HandleCrash simply catches a crash and logs an error. Meant to be called via defer.
func IsCIdentifier ¶
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 IsDNSLabel ¶
IsDNSLabel tests for a string that conforms to the definition of a label in DNS (RFC 1035/1123).
func IsDNSSubdomain ¶
IsDNSSubdomain tests for a string that conforms to the definition of a subdomain in DNS (RFC 1035/1123).
func IsValidPortNum ¶
IsValidPortNum tests that the argument is a valid, non-zero port number.
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 ¶
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.
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.
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.
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 ¶
NewStringSet creates a StringSet from a list of values.
func (StringSet) IsSuperset ¶
IsSuperset returns true iff s1 is a superset of s2.
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 ¶
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 (Time) MarshalJSON ¶
MarshalJSON implements the json.Marshaler interface.
func (Time) Rfc3339Copy ¶
Rfc3339Copy returns a copy of the Time at second-level precision.
func (*Time) UnmarshalJSON ¶
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.
Source Files
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Directories
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| Path | Synopsis |
|---|---|
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Package config provides utility objects for decoupling sources of configuration and the actual configuration state.
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Package config provides utility objects for decoupling sources of configuration and the actual configuration state. |
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Package exec provides an injectable interface and implementations for running commands.
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Package exec provides an injectable interface and implementations for running commands. |
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Package iptables provides an interface and implementations for running iptables commands.
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Package iptables provides an interface and implementations for running iptables commands. |
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Package wait provides tools for polling or listening for changes to a condition.
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Package wait provides tools for polling or listening for changes to a condition. |