util

package
v7.0.1+incompatible Latest Latest
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 Go to latest Published: Aug 25, 2022 License: Apache-2.0, BSD-2-Clause, BSD-3-Clause, + 1 more Imports: 22 Imported by: 0

Documentation

Index

Examples

Constants

View Source 
const BitsPerByte = 8
View Source 
const ConstantBackoffDuration = 30 * time.Second

ConstantBackoffDuration is a fallback duration that may be used by an application along with NewConstantBackoff()

View Source 
const DefaultFactor = 2.0

DefaultFactor may be used by applications for the factor argument.

View Source 
const MSPerNS = int64(1000000)

Variables

This section is empty.

Functions

func AESDecrypt 

func AESDecrypt(bytesToDecrypt []byte, aesKey []byte) ([]byte, error)

AESDecrypt takes in a 16, 24, or 32 byte AES key (128, 192, 256 bit encryption respectively) and encrypted text. It returns the resulting decrypted text. In case of error, the text returned is an empty string. AES requires input text to be greater than 12 bytes in length.

func AESEncrypt 

func AESEncrypt(bytesToEncrypt []byte, aesKey []byte) ([]byte, error)

AESEncrypt takes in a 16, 24, or 32 byte AES key (128, 192, 256 bit encryption respectively) and plain text. It returns the encrypted text. In case of error, the text returned is an empty string. AES requires input text to be greater than 12 bytes in length.

func BoolPtr 

func BoolPtr(b bool) *bool
Example 
ptr := BoolPtr(true)
fmt.Println(*ptr)

Output:

true

func BytesLenSplit 

func BytesLenSplit(s []byte, n int) [][]byte

BytesLenSplit splits the given byte array into an n-length arrays. If n > len(s), returns a slice with a single []byte containing all of s. If n <= 0, returns an empty slice.

func CIDRIsSubset 

func CIDRIsSubset(na *net.IPNet, nb *net.IPNet) bool

CIDRIsSubset returns whether na is a subset (possibly improper) of nb.

func CamelToSnakeCase 

func CamelToSnakeCase(s string) string
Example 
camel := "camelCase"
fmt.Println(CamelToSnakeCase(camel))
camel = "PascalCase"
fmt.Println(CamelToSnakeCase(camel))
camel = "IPIsAnInitialismForInternetProtocol"
fmt.Println(CamelToSnakeCase(camel))

Output:

camel_case
pascal_case
ipis_an_initialism_for_internet_protocol

func CoalesceCIDRs 

func CoalesceCIDRs(cidrs []*net.IPNet, coalesceNumber int, coalesceMaskLen int) []*net.IPNet

CoalesceCIDRs coalesces cidrs into a smaller set of CIDRs, by combining overlapping networks into networks of size coalesceMaskLen, if there are at least coalesceNumber cidrs in the larger mask.

func CoalesceIPs 

func CoalesceIPs(ips []net.IP, coalesceNumber int, coalesceMaskLen int) []*net.IPNet

CoalesceIPs combines ips into CIDRs, by combining overlapping networks into networks of size coalesceMaskLen, if there are at least coalesceNumber IPs in the larger mask.

func ContainsStr 

func ContainsStr(a []string, x string) bool
Example 
arr := []string{"test", "quest"}
fmt.Println(ContainsStr(arr, "test"))
fmt.Println(ContainsStr(arr, "foo"))

Output:

true
false

func ErrsToStrs 

func ErrsToStrs(errs []error) []string
Example 
errs := []error{
	errors.New("test"),
	errors.New("quest"),
}
strs := ErrsToStrs(errs)
fmt.Println(strs[0])
fmt.Println(strs[1])

Output:

test
quest

func FirstIP 

func FirstIP(ipn *net.IPNet) net.IP

FirstIP returns the first IP in the CIDR. For example, The CIDR 192.0.2.0/24 returns 192.0.2.0.

func FloatPtr 

func FloatPtr(f float64) *float64
Example 
ptr := FloatPtr(5.0)
fmt.Println(*ptr)

Output:

5

func HashInts 

func HashInts(ints []int, sortIntsBeforeHashing bool) []byte

HashInts returns a SHA512 hash of ints. If sortIntsBeforeHashing, the ints are sorted before before hashing. Sorting is done in a copy, the input ints slice is not modified.

func IP4InRange 

func IP4InRange(ip, ipRange string) (bool, error)

func IP4ToNum 

func IP4ToNum(ip string) (uint32, error)

func IPToCIDR 

func IPToCIDR(ip net.IP) *net.IPNet

IPToCIDR returns the CIDR containing just the given IP. For IPv6, this means /128, for IPv4, /32.

func Int64Ptr 

func Int64Ptr(i int64) *int64
Example 
ptr := Int64Ptr(5)
fmt.Println(*ptr)

Output:

5

func IntPtr 

func IntPtr(i int) *int
Example 
ptr := IntPtr(5)
fmt.Println(*ptr)

Output:

5

func IntSliceToMap 

func IntSliceToMap(s []int) map[int]struct{}

IntSliceToMap creates an int set from an array.

Example 
ints := []int{1, 2, 3}
fmt.Printf("%+v", IntSliceToMap(ints))

Output:

map[1:{} 2:{} 3:{}]

func InterfacePtr 

func InterfacePtr(i interface{}) *interface{}
Example 
ptr := InterfacePtr(1 + 2i)
fmt.Println(*ptr)

Output:

(1+2i)

func JoinErrs 

func JoinErrs(errs []error) error

func JoinErrsSep 

func JoinErrsSep(errs []error, separator string) error
Example 
errs := []error{
	errors.New("test"),
	errors.New("quest"),
}

fmt.Println(JoinErrsSep(errs, "\n"))

Output:

test
quest

func JoinErrsStr 

func JoinErrsStr(errs []error) string
Example 
errs := []error{
	errors.New("test"),
	errors.New("quest"),
}

fmt.Println(JoinErrsStr(errs))
fmt.Println(JoinErrsStr(nil))

Output:

test, quest

func LastIP 

func LastIP(ipn *net.IPNet) net.IP

LastIP returns the last IP in the CIDR. For example, The CIDR 192.0.2.0/24 returns 192.0.2.255.

func RangeStr 

func RangeStr(ipn *net.IPNet) string

RangeStr returns the hyphenated range of IPs. For example, The CIDR 192.0.2.0/24 returns "192.0.2.0-192.0.2.255".

func RemoveStrDuplicates 

func RemoveStrDuplicates(inputStrings []string, seenStrings map[string]struct{}) ([]string, map[string]struct{})

RemoveStrDuplicates removes duplicates from strings, considering a map of already-seen duplicates. Returns the strings which are unique, and not already present in seen; and a map of the unique strings in inputStrings and seenStrings.

This can be used, for example, to remove duplicates from multiple lists of strings, in order, using a shared map of seen strings.

Example 
strs := []string{
	"test",
	"quest",
	"foo",
	"test",
	"foo",
	"bar",
}
unDuped, _ := RemoveStrDuplicates(strs, nil)
for _, str := range unDuped {
	fmt.Println(str)
}

Output:

test
quest
foo
bar

func RemoveStrFromArray 

func RemoveStrFromArray(strs []string, s string) []string

RemoveStrFromArray removes a specific string from a string slice.

func Stacktrace 

func Stacktrace() []byte

Stacktrace is a helper function which returns the current stacktrace. It wraps runtime.Stack, which requires a sufficiently long buffer.

func StrInArray 

func StrInArray(strs []string, s string) bool

StrInArray returns whether s is one of the strings in strs.

Example 
arr := []string{"test", "quest"}
fmt.Println(StrInArray(arr, "test"))
fmt.Println(StrInArray(arr, "foo"))

Output:

true
false

func StrPtr 

func StrPtr(str string) *string
Example 
ptr := StrPtr("testquest")
fmt.Println(*ptr)

Output:

testquest

func StripAllWhitespace 

func StripAllWhitespace(s string) string

StripAllWhitespace returns s with all whitespace removed, as defined by unicode.IsSpace.

Example 
input := "\n\t \vtest\t\v\r\n quest\v\n \t"
fmt.Println(StripAllWhitespace(input))

Output:

testquest

func TimePtr 

func TimePtr(t time.Time) *time.Time

func ToNumeric 

func ToNumeric(v interface{}) (float64, bool)

ToNumeric returns a float for any numeric type, and false if the interface does not hold a numeric type. This allows converting unknown numeric types (for example, from JSON) in a single line TODO try to parse string stats as numbers?

func UInt64Ptr 

func UInt64Ptr(u uint64) *uint64
Example 
ptr := UInt64Ptr(5)
fmt.Println(*ptr)

Output:

5

func UIntPtr 

func UIntPtr(u uint) *uint
Example 
ptr := UIntPtr(5)
fmt.Println(*ptr)

Output:

5

func Uint64Ptr 

func Uint64Ptr(u uint64) *uint64
Example 
ptr := Uint64Ptr(5)
fmt.Println(*ptr)

Output:

5

func ValidateAESKey 

func ValidateAESKey(keyBytes []byte) error

ValidateAESKey takes in a byte slice and tests if it's a valid AES key (16, 24, or 32 bytes)

Types

type Backoff 

type Backoff interface {
	BackoffDuration() time.Duration
	Reset()
}

func NewBackoff 

func NewBackoff(min time.Duration, max time.Duration, factor float64) (Backoff, error)

func NewConstantBackoff 

func NewConstantBackoff(d time.Duration) Backoff

type BodyInterceptor 

type BodyInterceptor struct {
	W         http.ResponseWriter
	BodyBytes []byte
}

BodyInterceptor fulfills the Writer interface, but records the body and doesn't actually write. This allows performing operations on the entire body written by a handler, for example, compressing or hashing. To actually write, call `RealWrite()`. Note this means `len(b)` and `nil` are always returned by `Write()`, any real write errors will be returned by `RealWrite()`.

func (*BodyInterceptor) Body 

func (i *BodyInterceptor) Body() []byte

Body returns the internal bytes stored by calls to Write.

func (*BodyInterceptor) Header 

func (i *BodyInterceptor) Header() http.Header

Header implements http.ResponseWriter. It returns BodyInterceptor's internal ResponseWriter.Header, without modification or tracking.

Example 
i := BodyInterceptor{W: httptest.NewRecorder()}
i.W.Header().Add("test", "quest")
fmt.Println(i.Header().Get("test"))

Output:

quest

func (*BodyInterceptor) RealWrite 

func (i *BodyInterceptor) RealWrite(b []byte) (int, error)

RealWrite writes BodyInterceptor's internal bytes, which were stored by calls to Write.

func (*BodyInterceptor) Write 

func (i *BodyInterceptor) Write(b []byte) (int, error)

Write implements http.ResponseWriter. It writes the given bytes to BodyInterceptor's internal tracking bytes, and does not write them to the internal ResponseWriter. To write the internal bytes, call BodyInterceptor.RealWrite.

func (*BodyInterceptor) WriteHeader 

func (i *BodyInterceptor) WriteHeader(rc int)

WriteHeader implements http.ResponseWriter. It does the real write to Interceptor's internal ResponseWriter, without modification or tracking.

type Interceptor 

type Interceptor struct {
	W         http.ResponseWriter
	Code      int
	ByteCount int
}

Interceptor implements http.ResponseWriter. It intercepts writes to w, and tracks the HTTP code and the count of bytes written, while still writing to w.

func (*Interceptor) Header 

func (i *Interceptor) Header() http.Header

Header implements http.ResponseWriter. It returns Interceptor's internal ResponseWriter.Header, without modification or tracking.

Example 
i := Interceptor{W: httptest.NewRecorder()}
i.W.Header().Add("test", "quest")
fmt.Println(i.Header().Get("test"))

Output:

quest

func (*Interceptor) Write 

func (i *Interceptor) Write(b []byte) (int, error)

Write implements http.ResponseWriter. It does the real write to Interceptor's internal ResponseWriter, while keeping track of the count of bytes written. It also sets Interceptor's tracked code to 200 if WriteHeader wasn't called (which is what the real http.ResponseWriter will write to the client).

func (*Interceptor) WriteHeader 

func (i *Interceptor) WriteHeader(rc int)

WriteHeader implements http.ResponseWriter. It does the real write to Interceptor's internal ResponseWriter, while keeping track of the code.

type JSONIntStr 

type JSONIntStr int64

JSONIntStr unmarshals JSON strings or numbers into an int. This is designed to handle backwards-compatibility for old Perl endpoints which accept both. Please do not use this for new endpoints or new APIs, APIs should be well-typed.

func (JSONIntStr) String 

func (i JSONIntStr) String() string
Example 
var a JSONIntStr = 5
fmt.Println(a)

Output:

5

func (JSONIntStr) ToInt64 

func (i JSONIntStr) ToInt64() int64
Example 
var a JSONIntStr = 5
fmt.Printf("%d (%T)\n", a, a)
fmt.Printf("%d (%T)\n", a.ToInt64(), a.ToInt64())

Output:

5 (util.JSONIntStr)
5 (int64)

func (*JSONIntStr) UnmarshalJSON 

func (i *JSONIntStr) UnmarshalJSON(d []byte) error

type JSONNameOrIDStr 

type JSONNameOrIDStr struct {
	Name *string
	ID   *int
}

JSONNameOrIDStr is designed to handle backwards-compatibility for old Perl endpoints which accept both. Please do not use this for new endpoints or new APIs, APIs should be well-typed. NOTE: this differs from JSONIntStr in that this field could be 1 of 3 options:

  1. string representing an integer
  2. string representing a unique name
  3. integer

func (JSONNameOrIDStr) MarshalJSON 

func (i JSONNameOrIDStr) MarshalJSON() ([]byte, error)

func (*JSONNameOrIDStr) UnmarshalJSON 

func (i *JSONNameOrIDStr) UnmarshalJSON(d []byte) error

Source Files

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