util

package
v6.8.0 Latest Latest
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Published: Dec 13, 2024 License: Apache-2.0 Imports: 31 Imported by: 0

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Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func AppArmorProfile

func AppArmorProfile() string

AppArmorProfile returns the current apparmor profile.

func CheckJwtToken

func CheckJwtToken(r *http.Request, trustedCerts map[string]x509.Certificate) (bool, string, *x509.Certificate)

CheckJwtToken checks whether the given request has JWT token that is valid and signed with client certificate from the trusted certificates. Returns whether or not the token is valid, the fingerprint of the certificate and the certificate.

func CheckTrustState

func CheckTrustState(cert x509.Certificate, trustedCerts map[string]x509.Certificate, networkCert *localtls.CertInfo, trustCACertificates bool) (bool, string)

CheckTrustState checks whether the given client certificate is trusted (i.e. it has a valid time span and it belongs to the given list of trusted certificates). Returns whether or not the certificate is trusted, and the fingerprint of the certificate.

func CompareConfigs

func CompareConfigs(config1, config2 map[string]string, exclude []string) error

CompareConfigs compares two config maps and returns an error if they differ.

func CompareVersions

func CompareVersions(version1, version2 [2]int, checkExtensions bool) (int, error)

CompareVersions compares the versions of two cluster members.

A version consists of the version the member's schema and the number of API extensions it supports.

Return 0 if they equal, 1 if the first version is greater than the second and 2 if the second is greater than the first.

Return an error if inconsistent versions are detected, for example the first member's schema is greater than the second's, but the number of extensions is smaller.

func CopyConfig

func CopyConfig(config map[string]string) map[string]string

CopyConfig creates a new map with a copy of the given config.

func DebugJSON

func DebugJSON(title string, r *bytes.Buffer, l logger.Logger)

DebugJSON helper to log JSON. Accepts a title to prefix the JSON log with, a *bytes.Buffer containing the JSON and a logger to use for logging the JSON (allowing for custom context to be added to the log).

func EtagCheck

func EtagCheck(r *http.Request, data any) error

EtagCheck validates the hash of the current state with the hash provided by the client.

func EtagHash

func EtagHash(data any) (string, error)

EtagHash hashes the provided data and returns the sha256.

func GenerateSequenceInt64

func GenerateSequenceInt64(begin, end, step int) ([]int64, error)

GenerateSequenceInt64 returns a sequence within a given range with given steps.

func GetArchitectures

func GetArchitectures() ([]int, error)

GetArchitectures returns the list of supported architectures.

func GetExecPath

func GetExecPath() string

GetExecPath returns the path to the current binary.

func GetStableRandomGenerator

func GetStableRandomGenerator(seed string) (*rand.Rand, error)

GetStableRandomGenerator returns a stable random generator. Uses the FNV-1a hash algorithm to convert the seed string into an int64 for use as seed to the non-cryptographic random number generator.

func GetStableRandomInt64FromList

func GetStableRandomInt64FromList(seed int64, list []int64) (int64, error)

GetStableRandomInt64FromList returns a stable random value from a given list.

func HTTPClient

func HTTPClient(certificate string, proxy proxyFunc) (*http.Client, error)

HTTPClient returns an http.Client using the given certificate and proxy.

func HugepagesPath

func HugepagesPath() (string, error)

HugepagesPath attempts to locate the mount point of the hugepages filesystem.

func InMemoryNetwork

func InMemoryNetwork() (net.Listener, func() net.Conn)

InMemoryNetwork creates a fully in-memory listener and dial function.

Each time the dial function is invoked a new pair of net.Conn objects will be created using net.Pipe: the listener's Accept method will unblock and return one end of the pipe and the other end will be returned by the dial function.

func IsJSONRequest

func IsJSONRequest(r *http.Request) bool

IsJSONRequest returns true if the content type of the HTTP request is JSON.

func IsRecursionRequest

func IsRecursionRequest(r *http.Request) bool

IsRecursionRequest checks whether the given HTTP request is marked with the "recursion" flag in its form values.

func ListenAddresses

func ListenAddresses(configListenAddress string) ([]string, error)

ListenAddresses returns a list of <host>:<port> combinations at which this machine can be reached. It accepts the configured listen address in the following formats: <host>, <host>:<port> or :<port>. If a listen port is not specified then then ports.HTTPSDefaultPort is used instead. If a non-empty and non-wildcard host is passed in then this functions returns a single element list with the listen address specified. Otherwise if an empty host or wildcard address is specified then all global unicast addresses actively configured on the host are returned. If an IPv4 wildcard address (0.0.0.0) is specified as the host then only IPv4 addresses configured on the host are returned.

Example
listenAddressConfigs := []string{
	"",
	"127.0.0.1:8000",   // Valid IPv4 address with port.
	"127.0.0.1",        // Valid IPv4 address without port.
	"[127.0.0.1]",      // Valid wrapped IPv4 address without port.
	"[::1]:8000",       // Valid IPv6 address with port.
	"::1:8000",         // Valid IPv6 address without port (that might look like a port).
	"::1",              // Valid IPv6 address without port.
	"[::1]",            // Valid wrapped IPv6 address without port.
	"example.com",      // Valid hostname without port.
	"example.com:8000", // Valid hostname with port.
	"foo:8000:9000",    // Invalid host and port combination.
	":::8000",          // Invalid host and port combination.
}

for _, listlistenAddressConfig := range listenAddressConfigs {
	listenAddress, err := ListenAddresses(listlistenAddressConfig)
	fmt.Printf("%q: %v %v\n", listlistenAddressConfig, listenAddress, err)
}
Output:

"": [] <nil>
"127.0.0.1:8000": [127.0.0.1:8000] <nil>
"127.0.0.1": [127.0.0.1:8443] <nil>
"[127.0.0.1]": [127.0.0.1:8443] <nil>
"[::1]:8000": [[::1]:8000] <nil>
"::1:8000": [[::1:8000]:8443] <nil>
"::1": [[::1]:8443] <nil>
"[::1]": [[::1]:8443] <nil>
"example.com": [example.com:8443] <nil>
"example.com:8000": [example.com:8000] <nil>
"foo:8000:9000": [] address foo:8000:9000: too many colons in address
":::8000": [] address :::8000: too many colons in address

func ReplaceDaemon

func ReplaceDaemon() error

ReplaceDaemon replaces the daemon by re-execing the binary.

func ServerTLSConfig

func ServerTLSConfig(cert *localtls.CertInfo) *tls.Config

ServerTLSConfig returns a new server-side tls.Config generated from the give certificate info.

func SupportsFilesystem

func SupportsFilesystem(filesystem string) bool

SupportsFilesystem checks whether a given filesystem is already supported by the kernel. Note that if the filesystem is a module, you may need to load it first.

func SysctlGet

func SysctlGet(path string) (string, error)

SysctlGet retrieves the value of a sysctl file in /proc/sys.

func SysctlSet

func SysctlSet(parts ...string) error

SysctlSet writes a value to a sysctl file in /proc/sys. Requires an even number of arguments as key/value pairs. E.g. SysctlSet("path1", "value1", "path2", "value2").

func WriteJSON

func WriteJSON(w http.ResponseWriter, body any, debugLogger logger.Logger) error

WriteJSON encodes the body as JSON and sends it back to the client Accepts optional debugLogger that activates debug logging if non-nil.

Types

type ContextAwareRequest

type ContextAwareRequest interface {
	WithContext(ctx context.Context) *http.Request
}

ContextAwareRequest is an interface implemented by http.Request starting from Go 1.8. It supports graceful cancellation using a context.

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