Struct grpcio::Metadata
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#[repr(C)]pub struct Metadata(_);
A collection of metadata entries that can be exchanged during a call.
gRPC supports these types of metadata:
-
Request headers
They are sent by the client at the beginning of a remote call before any request messages are sent.
-
Response headers
They are sent by the server at the beginning of a remote call handler before any response messages are sent.
-
Response trailers
They are sent by the server at the end of a remote call along with resulting call status.
Metadata value can be ascii string or bytes. They are distinguish by the key suffix, key of bytes value should have suffix '-bin'.
Methods
impl Metadata
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pub fn len(&self) -> usize
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Returns the count of metadata entries.
pub fn is_empty(&self) -> bool
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Returns true if there is no metadata entries.
pub fn get(&self, index: usize) -> Option<(&str, &[u8])>
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Returns the metadata entry at the index
.
None
is returned if out of bound.
ⓘImportant traits for MetadataIter<'a>pub fn iter(&self) -> MetadataIter
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Returns an iterator over the metadata entries.
Trait Implementations
impl Clone for Metadata
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fn clone(&self) -> Metadata
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Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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Performs copy-assignment from source
. Read more
impl Drop for Metadata
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impl<'a> IntoIterator for &'a Metadata
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type IntoIter = MetadataIter<'a>
Which kind of iterator are we turning this into?
type Item = (&'a str, &'a [u8])
The type of the elements being iterated over.
ⓘImportant traits for MetadataIter<'a>fn into_iter(self) -> MetadataIter<'a>
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Creates an iterator from a value. Read more