metadata

package
Version: v1.42.0 Latest Latest
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Published: Nov 2, 2021 License: Apache-2.0 Imports: 3 Imported by: 9,426

Documentation

Overview

Package metadata define the structure of the metadata supported by gRPC library. Please refer to https://github.com/grpc/grpc/blob/master/doc/PROTOCOL-HTTP2.md for more information about custom-metadata.

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func AppendToOutgoingContext added in v1.10.0

func AppendToOutgoingContext(ctx context.Context, kv ...string) context.Context

AppendToOutgoingContext returns a new context with the provided kv merged with any existing metadata in the context. Please refer to the documentation of Pairs for a description of kv.

func DecodeKeyValue deprecated

func DecodeKeyValue(k, v string) (string, string, error)

DecodeKeyValue returns k, v, nil.

Deprecated: use k and v directly instead.

func NewIncomingContext added in v1.3.0

func NewIncomingContext(ctx context.Context, md MD) context.Context

NewIncomingContext creates a new context with incoming md attached.

func NewOutgoingContext added in v1.3.0

func NewOutgoingContext(ctx context.Context, md MD) context.Context

NewOutgoingContext creates a new context with outgoing md attached. If used in conjunction with AppendToOutgoingContext, NewOutgoingContext will overwrite any previously-appended metadata.

Types

type MD

type MD map[string][]string

MD is a mapping from metadata keys to values. Users should use the following two convenience functions New and Pairs to generate MD.

func FromIncomingContext added in v1.3.0

func FromIncomingContext(ctx context.Context) (MD, bool)

FromIncomingContext returns the incoming metadata in ctx if it exists.

All keys in the returned MD are lowercase.

func FromOutgoingContext added in v1.3.0

func FromOutgoingContext(ctx context.Context) (MD, bool)

FromOutgoingContext returns the outgoing metadata in ctx if it exists.

All keys in the returned MD are lowercase.

func FromOutgoingContextRaw added in v1.10.0

func FromOutgoingContextRaw(ctx context.Context) (MD, [][]string, bool)

FromOutgoingContextRaw returns the un-merged, intermediary contents of rawMD.

Remember to perform strings.ToLower on the keys, for both the returned MD (MD is a map, there's no guarantee it's created using our helper functions) and the extra kv pairs (AppendToOutgoingContext doesn't turn them into lowercase).

This is intended for gRPC-internal use ONLY. Users should use FromOutgoingContext instead.

func Join added in v1.0.2

func Join(mds ...MD) MD

Join joins any number of mds into a single MD.

The order of values for each key is determined by the order in which the mds containing those values are presented to Join.

func New

func New(m map[string]string) MD

New creates an MD from a given key-value map.

Only the following ASCII characters are allowed in keys:

- digits: 0-9
- uppercase letters: A-Z (normalized to lower)
- lowercase letters: a-z
- special characters: -_.

Uppercase letters are automatically converted to lowercase.

Keys beginning with "grpc-" are reserved for grpc-internal use only and may result in errors if set in metadata.

func Pairs

func Pairs(kv ...string) MD

Pairs returns an MD formed by the mapping of key, value ... Pairs panics if len(kv) is odd.

Only the following ASCII characters are allowed in keys:

- digits: 0-9
- uppercase letters: A-Z (normalized to lower)
- lowercase letters: a-z
- special characters: -_.

Uppercase letters are automatically converted to lowercase.

Keys beginning with "grpc-" are reserved for grpc-internal use only and may result in errors if set in metadata.

func (MD) Append added in v1.12.0

func (md MD) Append(k string, vals ...string)

Append adds the values to key k, not overwriting what was already stored at that key.

k is converted to lowercase before storing in md.

func (MD) Copy

func (md MD) Copy() MD

Copy returns a copy of md.

func (MD) Delete added in v1.40.0

func (md MD) Delete(k string)

Delete removes the values for a given key k which is converted to lowercase before removing it from md.

func (MD) Get added in v1.12.0

func (md MD) Get(k string) []string

Get obtains the values for a given key.

k is converted to lowercase before searching in md.

func (MD) Len

func (md MD) Len() int

Len returns the number of items in md.

func (MD) Set added in v1.12.0

func (md MD) Set(k string, vals ...string)

Set sets the value of a given key with a slice of values.

k is converted to lowercase before storing in md.

Source Files

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