util

package
v1.12.0 Latest Latest
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 Go to latest Published: Jun 29, 2020 License: Apache-2.0 Imports: 19 Imported by: 15

Documentation

Overview

CheckForIscsi is blocking call for checking status of istgt in cstor-istgt container.

Package util provides functions based on k8s.io/apimachinery/pkg/apis/meta/v1/unstructured They are copied here to make them exported.

TODO Check if it makes sense to import the entire unstructured package of k8s.io/apimachinery/pkg/apis/meta/v1/unstructured versus. copying

TODO Move to maya/pkg/unstructured/v1alpha1 as helpers.go

Index

Constants

View Source 
const (

	// OpenEBSNamespace is the environment variable to get openebs namespace
	//
	// This environment variable is set via kubernetes downward API
	OpenEBSNamespace = "OPENEBS_NAMESPACE"

	// OpenEBSBaseDir is the environment variable to get base directory of
	// openebs
	OpenEBSBaseDir = "OPENEBS_IO_BASE_DIR"

	// Namespace is the environment variable to get openebs namespace
	//
	// This environment variable is set via kubernetes downward API
	Namespace = "NAMESPACE"

	// DefaultOpenEBSServiceAccount name of the default openebs service accout with
	// required permissions
	DefaultOpenEBSServiceAccount = "openebs-maya-operator"

	// OpenEBSServiceAccount is the environment variable to get operator service
	// account name
	//
	// This environment variable is set via kubernetes downward API in cvc and
	// cspc operators deployments
	OpenEBSServiceAccount = "OPENEBS_SERVICEACCOUNT_NAME"
)
View Source 
const (
	IstgtConfPath        = "/usr/local/etc/istgt/istgt.conf"
	IstgtStatusCmd       = "STATUS"
	IstgtRefreshCmd      = "REFRESH"
	IstgtReplicaCmd      = "REPLICA"
	IstgtExecuteQuietCmd = "-q"
	ReplicaStatus        = "Replica status"
	WaitTimeForIscsi     = 3 * time.Second
	// IstgtResizeCmd holds the command to trigger resize
	IstgtResizeCmd = "RESIZE"
	IstgtDRFCmd    = "DRF"
)
View Source 
const (
	IstgtUctlUnxpath = "/var/run/istgt_ctl_sock"
	EndOfLine        = "\r\n"
	IstgtHeader      = "iSCSI Target Controller version"
)

IstgtUctlUnxpath is the storage path for the UNIX domain socket from istgt

Variables

View Source 
var (
	// ErrMAPIADDRNotSet is the new error to display this error if MAPI_ADDR is not set.
	ErrMAPIADDRNotSet = errors.New("MAPI_ADDR environment variable not set")
	// ErrInternalServerError is the new error to raise if an error occurs while rendering the service
	ErrInternalServerError = errors.New("Internal Server Error")
	// ErrServerUnavailable is the new error to raise if the server is not available
	ErrServerUnavailable = errors.New("Server Unavailable")
	// ErrServerNotReachable is the new error to raise if the server is not reachable
	ErrServerNotReachable = errors.New("Server Not Reachable")
	// ErrPageNotFound is the new error to raise if the page is not found
	ErrPageNotFound = errors.New("Page Not Found")
)

Functions

func CheckErr 

func CheckErr(err error, handleErr func(string))

CheckErr to handle command errors

func CheckFalsy 

func CheckFalsy(falsy string) bool

CheckFalsy checks for non-truthiness of the passed argument.

func CheckForIscsi 

func CheckForIscsi(UnixSockVar UnixSock)

func CheckTruthy 

func CheckTruthy(truth string) bool

CheckTruthy checks for truthiness of the passed argument.

func ContainKeys 

func ContainKeys(mapOfObjs map[string]interface{}, keys []string) bool

ContainKeys returns true if all the provided keys are present in the provided map

func ContainsKey 

func ContainsKey(mapOfObjs map[string]interface{}, key string) bool

ContainsKey returns true if the provided key is present in the provided map

func ContainsString 

func ContainsString(stringarr []string, element string) bool

ContainsString returns true if the provided element is present in the provided array

func DeleteNestedField 

func DeleteNestedField(obj map[string]interface{}, fields ...string)

DeleteNestedField deletes a nested field from the provided map

func Fatal 

func Fatal(msg string)

Fatal prints the message (if provided) and then exits. If V(2) or greater, klog.Fatal is invoked for extended information.

func FormatKV 

func FormatKV(in []string) string

FormatKV takes a set of strings and formats them into properly aligned k = v pairs using the columnize library.

func FormatList 

func FormatList(in []string) string

FormatList takes a set of strings and formats them into properly aligned output, replacing any blank fields with a placeholder for awk-ability.

func FormatListWithSpaces 

func FormatListWithSpaces(in []string) string

FormatListWithSpaces takes a set of strings and formats them into properly aligned output. It should be used sparingly since it doesn't replace empty values and hence not awk/sed friendly

func FormatTime 

func FormatTime(t time.Time) string

FormatTime formats the time to string based on RFC822

func FormatTimeDifference 

func FormatTimeDifference(first, second time.Time, d time.Duration) string

FormatTimeDifference takes two times and determines their duration difference truncating to a passed unit. E.g. formatTimeDifference(first=1m22s33ms, second=1m28s55ms, time.Second) -> 6s

func FormatUnixNanoTime 

func FormatUnixNanoTime(nano int64) string

FormatUnixNanoTime is a helper for formatting time for output.

func GetEnv 

func GetEnv(envKey string) (value string)

GetEnv fetches the provided environment variable's value

func GetMapOfStrings 

func GetMapOfStrings(obj map[string]interface{}, field string) map[string]string

GetMapOfStrings gets the direct value from the passed obj & the field path The value returned should be expected of the form map[string]string

func GetNamespace 

func GetNamespace() string

GetNamespace gets the namespace OPENEBS_NAMESPACE env value which is set by the downward API where CVC-Operator has been deployed

func GetNestedArray 

func GetNestedArray(obj map[string]interface{}, fields ...string) []interface{}

GetNestedArray returns an nested array from the provided map

func GetNestedField 

func GetNestedField(obj map[string]interface{}, fields ...string) interface{}

GetNestedField returns a nested field from the provided map

func GetNestedFieldInto 

func GetNestedFieldInto(out interface{}, obj map[string]interface{}, fields ...string) error

GetNestedFieldInto converts a nested field to requested type from the provided map

func GetNestedInt64 

func GetNestedInt64(obj map[string]interface{}, fields ...string) int64

GetNestedInt64 returns an nested int64 from the provided map

func GetNestedInt64Pointer 

func GetNestedInt64Pointer(obj map[string]interface{}, fields ...string) *int64

GetNestedInt64Pointer returns a nested int64 pointer from the provided map

func GetNestedMap 

func GetNestedMap(obj map[string]interface{}, fields ...string) map[string]string

GetNestedMap returns a nested map from the provided map

func GetNestedSlice 

func GetNestedSlice(obj map[string]interface{}, fields ...string) []string

GetNestedSlice returns a nested slice from the provided map

func GetNestedString 

func GetNestedString(obj map[string]interface{}, fields ...string) string

GetNestedString returns a nested string from the provided map

func GetOpenebsBaseDirPath 

func GetOpenebsBaseDirPath() string

GetOpenebsBaseDirPath returns the base path to store openebs related files on host machine

func GetServiceAccountName 

func GetServiceAccountName() string

GetServiceAccountName gets the name of OPENEBS_SERVICEACCOUNT_NAME env value which is set by the downward API of cvc and cspc operator deployments

func Hash 

func Hash(obj interface{}) (string, error)

Hash constructs the hash value for any type of object

func IsChangeInLists 

func IsChangeInLists(listA, listB []string) bool

IsChangeInLists returns true if there is any difference in listA and listB

func IsResponseEOD 

func IsResponseEOD(resp []string, cmd string) bool

IsResponseEOD will detect if the data coming from UNIX pipe is completely received

func ListDiff 

func ListDiff(listA []string, listB []string) []string

ListDiff returns list of string which are in listA but not in listB

func ListIntersection 

func ListIntersection(listA []string, listB []string) []string

ListIntersection returns list of string which are in listA and listB

func LookupOrFalse 

func LookupOrFalse(envKey string) string

LookupOrFalse looks up an environment variable and returns a string "false" if environment variable is not present. It returns appropriate values for other cases.

func MergeMapOfObjects 

func MergeMapOfObjects(dest map[string]interface{}, src map[string]interface{}) bool

MergeMapOfObjects will merge the map from src to dest. It will override existing keys of the destination

func MergeMapOfStrings 

func MergeMapOfStrings(dest map[string]string, src map[string]string) bool

MergeMapOfStrings will merge the map from src to dest

func MergeMaps 

func MergeMaps(maps ...map[string]interface{}) map[string]interface{}

MergeMaps merges maps and returns the resulting map. map priority increases with order i.e. MergeMaps(m1,m2) will result in a map with overriding values from m2

func Reader 

func Reader(r io.Reader, cmd string) []string

Reader reads the response from unix domain socket

func RemoveString 

func RemoveString(slice []string, s string) (result []string)

RemoveString removes all occurrences of a string from slice and returns a new updated slice

func SetNestedField 

func SetNestedField(obj map[string]interface{}, value interface{}, fields ...string)

SetNestedField sets a nested field into the provided map

func SetNestedMap 

func SetNestedMap(obj map[string]interface{}, value map[string]string, fields ...string)

SetNestedMap sets a nested map from the provided map

func SetNestedSlice 

func SetNestedSlice(obj map[string]interface{}, value []string, fields ...string)

SetNestedSlice sets a nested slice from the provided map

func StrToInt32 

func StrToInt32(val string) *int32

StrToInt32 converts a string type to corresponding *int32 type

NOTE: 

This swallows the error if any

func StringToInt32 

func StringToInt32(val string) (*int32, error)

StringToInt32 converts a string type to corresponding *int32 type

func Writer 

func Writer(w io.Writer, msg string) error

Writer writes a command to unix domain socket

Types

type FileOperator 

type FileOperator interface {
	Write(filename string, data []byte, perm os.FileMode) error
	Updatefile(fileName, updateVal, searchString string, perm os.FileMode) error
	GetLineDetails(filename, searchString string) (int, string, error)
	UpdateOrAppendMultipleLines(fileName string, keyUpdateValue map[string]string, perm os.FileMode) error
}

FileOperator operates on files

type LineLimitReader 

type LineLimitReader struct {
	io.ReadCloser
	// contains filtered or unexported fields
}

LineLimitReader wraps another reader and provides `tail -n` like behavior. LineLimitReader buffers up to the searchLimit and returns `-n` number of lines. After those lines have been returned, LineLimitReader streams the underlying ReadCloser

func NewLineLimitReader 

func NewLineLimitReader(r io.ReadCloser, lines, searchLimit int, timeLimit time.Duration) *LineLimitReader

NewLineLimitReader takes the ReadCloser to wrap, the number of lines to find searching backwards in the first searchLimit bytes. timeLimit can optionally be specified by passing a non-zero duration. When set, the search for the last n lines is aborted if no data has been read in the duration. This can be used to flush what is had if no extra data is being received. When used, the underlying reader must not block forever and must periodically unblock even when no data has been read.

func (*LineLimitReader) Read 

func (l *LineLimitReader) Read(p []byte) (n int, err error)

type RealFileOperator 

type RealFileOperator struct{}

RealFileOperator is used for writing the actual files without mocking

func (RealFileOperator) GetLineDetails 

func (r RealFileOperator) GetLineDetails(filename, searchString string) (int, string, error)

GetLineDetails return the line number and line content of matched string in file

func (RealFileOperator) UpdateOrAppendMultipleLines 

func (r RealFileOperator) UpdateOrAppendMultipleLines(fileName string,
	keyUpdateValue map[string]string, perm os.FileMode) error

UpdateOrAppendMultipleLines will update or append multiple lines based on the given string

func (RealFileOperator) Updatefile 

func (r RealFileOperator) Updatefile(fileName, updatedVal, searchString string, perm os.FileMode) error

Updatefile updates the line number with the given string

func (RealFileOperator) Write 

func (r RealFileOperator) Write(filename string, data []byte, perm os.FileMode) error

the real file operator for the actual program,

type RealRunner 

type RealRunner struct{}

RealRunner is the real runner for the program that actually execs the command.

func (RealRunner) RunCombinedOutput 

func (r RealRunner) RunCombinedOutput(command string, args ...string) ([]byte, error)

RunCombinedOutput runs the command and returns its combined standard output and standard error.

func (RealRunner) RunCommandWithLog 

func (r RealRunner) RunCommandWithLog(command string, args ...string) ([]byte, error)

RunCommandWithLog triggers command passed as arguments and it also does the following things before command completion 1. Logs the stdout of command to stdout(standard output) 2. Logs stderr of the command to standard error

func (RealRunner) RunCommandWithTimeoutContext 

func (r RealRunner) RunCommandWithTimeoutContext(timeout time.Duration, command string, args ...string) ([]byte, error)

RunCommandWithTimeoutContext executes command provides and returns stdout error. If command does not returns within given timout interval command will be killed and return "Context time exceeded"

func (RealRunner) RunStdoutPipe 

func (r RealRunner) RunStdoutPipe(command string, args ...string) ([]byte, error)

RunStdoutPipe returns a pipe that will be connected to the command's standard output when the command starts.

type RealUnixSock 

type RealUnixSock struct{}

RealUnixSock is used for sending data through real unix domain sockets

func (RealUnixSock) SendCommand 

func (r RealUnixSock) SendCommand(cmd string) ([]string, error)

SendCommand for the real unix sock for the actual program,

type Runner 

type Runner interface {
	RunCombinedOutput(string, ...string) ([]byte, error)
	RunStdoutPipe(string, ...string) ([]byte, error)
	RunCommandWithTimeoutContext(time.Duration, string, ...string) ([]byte, error)
	RunCommandWithLog(string, ...string) ([]byte, error)
}

Runner interface implements various methods of running binaries which can be modified for unit testing.

type TestFileOperator 

type TestFileOperator struct{}

TestFileOperator is used as a dummy FileOperator

func (TestFileOperator) GetLineDetails 

func (r TestFileOperator) GetLineDetails(filename, searchString string) (int, string, error)

GetLineDetails is to mock operation for FileOperator interface

func (TestFileOperator) UpdateOrAppendMultipleLines 

func (r TestFileOperator) UpdateOrAppendMultipleLines(
	fileName string,
	keyUpdateValue map[string]string,
	perm os.FileMode) error

UpdateOrAppendMultipleLines is to mock operation for FileOperator interface

func (TestFileOperator) Updatefile 

func (r TestFileOperator) Updatefile(fileName, updateStorageVal, searchString string, perm os.FileMode) error

Updatefile is to mock Updatefile operation for FileOperator interface

func (TestFileOperator) Write 

func (r TestFileOperator) Write(filename string, data []byte, perm os.FileMode) error

Write is to mock write operation for FileOperator interface

type TestRunner 

type TestRunner struct{}

TestRunner is used as a dummy Runner

func (TestRunner) RunCombinedOutput 

func (r TestRunner) RunCombinedOutput(command string, args ...string) ([]byte, error)

RunCombinedOutput is to mock Real runner exec.

func (TestRunner) RunCommandWithLog 

func (r TestRunner) RunCommandWithLog(command string, args ...string) ([]byte, error)

RunCommandWithLog is to mock real runner exec with stdoutpipe.

func (TestRunner) RunCommandWithTimeoutContext 

func (r TestRunner) RunCommandWithTimeoutContext(timeout time.Duration, command string, args ...string) ([]byte, error)

RunCommandWithTimeoutContext is to mock Real runner exec.

func (TestRunner) RunStdoutPipe 

func (r TestRunner) RunStdoutPipe(command string, args ...string) ([]byte, error)

RunStdoutPipe is to mock real runner exec with stdoutpipe.

type TestUnixSock 

type TestUnixSock struct{}

TestUnixSock is used as a dummy UnixSock

func (TestUnixSock) SendCommand 

func (r TestUnixSock) SendCommand(cmd string) ([]string, error)

SendCommand for the real unix sock for the actual program,

type UnixSock 

type UnixSock interface {
	SendCommand(cmd string) ([]string, error)
}

UnixSock operates on unix domain sockets

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