GRPC PHP
1.66.0
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gRPC supports DNS as the default name-system. A number of alternative name-systems are used in various deployments. We support an API that is general enough to support a range of name-systems and the corresponding syntax for names. The gRPC client library in various languages will provide a plugin mechanism so resolvers for different name-systems can be plugged in.
A fully qualified, self contained name used for gRPC channel construction uses URI syntax as defined in RFC 3986.
The URI scheme indicates what resolver plugin to use. If no scheme prefix is specified or the scheme is unknown, the dns
scheme is used by default.
The URI path indicates the name to be resolved.
Most gRPC implementations support the following URI schemes:
dns:[//authority/]host[:port]
– DNS (default)host
is the host to resolve via DNS.port
is the port to return for each address. If not specified, 443 is used (but some implementations default to 80 for insecure channels).authority
indicates the DNS server to use, although this is only supported by some implementations. (In C-core, the default DNS resolver does not support this, but the c-ares based resolver supports specifying this in the form "IP:port".)unix:path
, unix://absolute_path
– Unix domain sockets (Unix systems only)path
indicates the location of the desired socket.unix-abstract:abstract_path
– Unix domain socket in abstract namespace (Unix systems only)abstract_path
indicates a name in the abstract namespace.abstract_path
.vsock:cid:port
– VSOCK (Linux systems only)cid
is 32-bit Context Identifier (CID). It indicates the source or destination, which is either a virtual machine or the host.port
is a 32-bit port number. It differentiates between multiple services running on a single machine.The following schemes are supported by the gRPC C-core implementation, but may not be supported in other languages:
ipv4:address[:port][,address[:port],...]
– IPv4 addressesaddress[:port]
:address
is the IPv4 address to use.port
is the port to use. If not specified, 443 is used.ipv6:address[:port][,address[:port],...]
– IPv6 addressesaddress[:port]
:address
is the IPv6 address to use. To use with a port
the address
must enclosed in literal square brackets ([
and ]
). Example: ipv6:[2607:f8b0:400e:c00::ef]:443
or ipv6:[::]:1234
port
is the port to use. If not specified, 443 is used.In the future, additional schemes such as etcd
could be added.
The gRPC client library will use the specified scheme to pick the right resolver plugin and pass it the fully qualified name string.
Resolvers should be able to contact the authority and get a resolution that they return back to the gRPC client library. The returned contents include:
The plugin API allows the resolvers to continuously watch an endpoint and return updated resolutions as needed.