prpc

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 Go to latest Published: Dec 20, 2024 License: Apache-2.0 Imports: 42 Imported by: 283

Documentation

Overview

Package prpc (provisional RPC) implements an RPC client over HTTP 1.x.

Like gRPC:

  • services are defined in .proto files
  • service implementation does not depend on pRPC.

Unlike gRPC:

  • supports HTTP 1.x and AppEngine
  • does not support streams.

It is similar in purpose to some other gRPC-compatible HTTP protocols, but predates them or makes different design choices:

Compile service definitions

Use cproto tool to compile .proto files to .go files with gRPC and pRPC support. It runs protoc and does some additional postprocessing. 

//go:generate cproto

Install cproto: 

go install go.chromium.org/luci/grpc/cmd/cproto

Protocol

v1.5

v1.5 is small, backward-compatible amendment to v1.4 that allows clients to advertise the maximum response size they are willing to deserialize.

A client MAY send "X-Prpc-Max-Response-Size" request header with a positive decimal number of bytes specifying the maximum uncompressed response size the client is willing to deserialize. The server MAY use it to discard responses larger than that size. If the server discards a response, it replies with UNAVAILABLE gRPC status with luci.prpc.ErrorDetails message as google.rpc.Status detail (see v1.2 section below for how it is encoded). This error proto contains ResponseTooBig as the realized oneof "error" alternative.

The response size is calculated as a length of the serialized response message using the negotiated response encoding (i.e. if the client asked for a JSON response, the response size is the length of the JSON blob with the serialized response message). Length of metadata or response compression (if any) have no effect on this check.

v1.4

v1.4 hides some leaking HTTP v1 transport implementation details from gRPC services and clients by stopping exposing values of the following headers in metadata.MD: "Accept", "Accept-Encoding", "Content-Encoding", "Content-Length", "Content-Type", "X-Content-Type-Options", all "X-Prpc-*" headers.

Note that "X-Prpc-Grpc-Timeout", "X-Prpc-Status-Details-Bin", "Content-Type" and "Accept" headers were already hidden in the previous version of the protocol.

Also note that such commonly present headers as "Host" and "User-Agent" are still exposed as metadata, since they are already used in the wild and the protocol does not depend on them significantly.

v1.3

v1.3 adds request/response body compression support using GZIP (RFC-1952).

  • A request MAY have a header "Content-Encoding: gzip". If it is present, then the server MUST decompress the request body before unmarshaling the request message.
  • A request MAY have a header "Accept-Encoding: gzip". If the header is present, then the server response body MAY be compressed; and the server SHOULD decide based on the response message size. If the response body is compressed, then the response MUST include a header "Content-Encoding: gzip".

See also https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Encoding and https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Accept-Encoding

v1.2

v1.2 is small, backward-compatible amendment to v1.1 that adds support for error details.

Response header "X-Prpc-Status-Details-Bin" contains elements of google.rpc.Status.details field, one value per element, in the same order. The header value is a standard base64 string with padding of the encoded google.protobuf.Any, where the message encoding is the same as the response message encoding, i.e. depends on Accept request header.

v1.1

v1.1 is small, backward-compatible amendment to v1.0 to address a security issue. Since it is backward compatible, it does not introduce a formal protocol version header at this time.

Changes:

  • Requests/responses must use "application/json" media type instead of "application/prpc; encoding=json".
  • Responses must include "X-Content-Type-Options: nosniff" HTTP header.

This enables CORB protection (which mitigates spectre) and disables content sniffing. For CORB, see https://chromium.googlesource.com/chromium/src/+/master/services/network/cross_origin_read_blocking_explainer.md.

v1.0

This section describes the base pRPC protocol. It is based on HTTP 1.x and employs gRPC codes.

A pRPC server MUST handle HTTP POST requests at `/prpc/{service}/{method}` where service is a full service name including full package name. The handler must decode an input message from an HTTP request, call the service method implementation and encode the returned output message or error to the HTTP response.

pRPC protocol defines three protocol buffer encodings and media types.

  • Binary: "application/prpc; encoding=binary" (default).
  • JSON: "application/prpc; encoding=json" or "application/json" A response body MUST have `)]}'\n` prefix to prevent XSSI.
  • Text: "application/prpc; encoding=text"

A pRPC server MUST support Binary and SHOULD support JSON and Text.

Request headers:

  • "X-Prpc-Grpc-Timeout": specifies request timeout. A client MAY specify it. If a service hits the timeout, a server MUST respond with HTTP 503 and DeadlineExceed gRPC code. Value format: `\d+[HMSmun]` (regular expression), where
  • H - hour
  • M - minute
  • S - second
  • m - millisecond
  • u - microsecond
  • n - nanosecond
  • "Content-Type": specifies input message encoding in the body. A client SHOULD specify it. If not present, a server MUST treat the input message as Binary.
  • "Accept": specifies the output message encoding for the response. A client MAY specify it, a server MUST support it.
  • Any other headers MUST be added to metadata.MD in the context that is passed to the service method implementation (note this behavior was amended in v1.4).
  • If a header name has "-Bin" suffix, the server must treat it as standard-base64-encoded with padding and put the decoded binary blob into the metadata under the original key (i.e. the one ending with "-bin").

Response headers:

  • "X-Prpc-Grpc-Code": specifies the gRPC code. A server MUST specify it in all cases.
  • If it is present, the client MUST ignore the HTTP status code.
  • If OK, the client MUST return the output message decoded from the body.
  • Otherwise, the client MUST return a gRPC error with the code and message read from the response body.
  • If not present, the client MUST return a non-gRPC error with message read from the response body. A client MAY read a portion of the response body.
  • "Content-Type": specifies the output message encoding. A server SHOULD specify it. If not specified, a client MUST treat it is as Binary.
  • Any metadata returned by a service method implementation MUST go into http headers, unless metadata key starts with "X-Prpc-".

A server MUST always specify "X-Prpc-Grpc-Code". The server SHOULD specify HTTP status corresponding to the gRPC code.

If the "X-Prpc-Grpc-Code" response header value is not 0, the response body MUST contain a description of the error.

If a service/method is not found, the server MUST respond with Unimplemented gRPC code and SHOULD specify HTTP 501 status.

Index

Constants

View Source 
const (
	// HeaderGRPCCode is a name of the HTTP header that specifies the
	// gRPC code in the response.
	// A pRPC server must always specify it.
	HeaderGRPCCode = "X-Prpc-Grpc-Code"

	// HeaderStatusDetail is a name of the HTTP header that contains
	// elements of google.rpc.Status.details field, one value per element,
	// in the same order.
	// The header value is a standard-base64 string of the encoded google.protobuf.Any,
	// where the message encoding is the same as the response message encoding,
	// i.e. depends on Accept request header.
	HeaderStatusDetail = "X-Prpc-Status-Details-Bin"

	// HeaderTimeout is HTTP header used to set pRPC request timeout.
	// The single value should match regexp `\d+[HMSmun]`.
	HeaderTimeout = "X-Prpc-Grpc-Timeout"

	// HeaderMaxResponseSize is HTTP request header with the maximum response
	// size the client will accept.
	HeaderMaxResponseSize = "X-Prpc-Max-Response-Size"

	// DefaultMaxResponseSize is the default maximum response size (in bytes)
	// the client is willing to read from the server.
	//
	// It is 32MiB minus 32KiB. Its value is picked to fit into Appengine response
	// size limits (taking into account potential overhead on headers).
	DefaultMaxResponseSize = 32*1024*1024 - 32*1024

	// UnlimitedMaxResponseSize can be used as Client's MaxResponseSize to remove
	// the limit on maximum acceptable response size: any response will be
	// accepted (with the risk of OOMing the client).
	UnlimitedMaxResponseSize = math.MaxInt
)
View Source 
const (
	// ContentTypePRPC is the formal MIME content type for pRPC messages.
	ContentTypePRPC = "application/prpc"
	// ContentTypeJSON is the JSON content type.
	ContentTypeJSON = "application/json"

	// JSONPBPrefix is prepended to a message in JSONPB format to avoid CSRF.
	JSONPBPrefix = ")]}'\n"
)
View Source 
const (
	// DefaultMaxRequestSize is the default maximum request size (in bytes)
	// the server is willing to read from the client.
	DefaultMaxRequestSize = 64 * 1024 * 1024

	// UnlimitedMaxRequestSize can be used as Server's MaxRequestSize to remove
	// limits on the allowed request size (with the risk of OOMing the client).
	UnlimitedMaxRequestSize = math.MaxInt
)

Variables

View Source 
var (
	// DefaultUserAgent is default User-Agent HTTP header for pRPC requests.
	DefaultUserAgent = "pRPC Client 1.5"

	// ErrNoStreamingSupport is returned if a pRPC client is used to start a
	// streaming RPC. They are not supported.
	ErrNoStreamingSupport = status.Error(codes.Unimplemented, "prpc: no streaming support")
)

Functions

func DecodeTimeout 

func DecodeTimeout(s string) (time.Duration, error)

DecodeTimeout decodes a gRPC/pRPC timeout header string into a time.Duration.

func EncodeTimeout 

func EncodeTimeout(t time.Duration) string

EncodeTimeout encodes a gRPC/pRPC timeout into a timeout header time.Duration.

This rounds the time.Duration to the smallest time unit that can represent it.

func ProtocolErrorDetails 

func ProtocolErrorDetails(err error) *prpcpb.ErrorDetails

ProtocolErrorDetails extracts pRPC protocol error details from a gRPC error if they are there.

If err is not a gRPC error, or it is a gRPC but with no ErrorDetails attached, returns nil.

func SetHeader 

func SetHeader(ctx context.Context, md metadata.MD) error

SetHeader sets the header metadata.

When called multiple times, all the provided metadata will be merged. Headers set this way will be sent whenever the RPC handler finishes (successfully or not).

Some headers are reserved for internal pRPC or HTTP needs and can't be set this way. This includes all "x-prpc-*" headers, various core HTTP headers (like "content-type") and all "access-control-*" headers (if you want to configure CORS policies, use [Server.AccessControl] field instead).

If ctx is not a pRPC server context, then SetHeader calls grpc.SetHeader such that calling prpc.SetHeader works for both pRPC and gRPC.

Types

type AccessControlDecision 

type AccessControlDecision struct {
	// AllowCrossOriginRequests defines if CORS policies should be enabled at all.
	//
	// If false, the server will not send any CORS policy headers and the browser
	// will use the default "same-origin" policy. All fields below will be
	// ignored.
	//
	// See https://developer.mozilla.org/en-US/docs/Web/Security/Same-origin_policy
	AllowCrossOriginRequests bool

	// AllowCredentials defines if a cross-origin request is allowed to use
	// credentials associated with the pRPC server's domain.
	//
	// This setting controls if the client can use `credentials: include` option
	// in Fetch init parameters or `withCredentials = true` in XMLHttpRequest.
	//
	// Credentials, as defined by Web APIs, are cookies, HTTP authentication
	// entries, and TLS client certificates.
	//
	// See
	//   https://developer.mozilla.org/en-US/docs/Web/API/fetch#parameters
	//   https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/withCredentials
	//   https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Access-Control-Allow-Credentials
	AllowCredentials bool

	// AllowHeaders is a list of request headers that a cross-origin request is
	// allowed to have.
	//
	// Extends the default list of allowed headers.
	//
	// Use this option if the authentication interceptor checks some custom
	// headers.
	AllowHeaders []string
}

AccessControlDecision describes how to handle a cross-origin request.

It is returned by AccessControl server callback based on the origin of the call and defines what CORS policy headers to add to responses to preflight requests and actual cross-origin requests.

See https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS for the general overview of CORS policies.

func AllowOriginAll 

func AllowOriginAll(ctx context.Context, origin string) AccessControlDecision

AllowOriginAll is a CORS policy that allows any origin to send cross-origin requests that can use credentials (e.g. cookies) and "Authorization" header.

Other non-standard headers are forbidden. Use a custom AccessControl callback to allow them.

type CallOption 

type CallOption struct {
	grpc.CallOption
	// contains filtered or unexported fields
}

CallOption mutates Options.

func ExpectedCode 

func ExpectedCode(codes ...codes.Code) *CallOption

ExpectedCode can be used to indicate that given non-OK codes may appear during normal successful call flow, and thus they must not be logged as erroneous.

Only affects local logging, nothing else.

func RequestFormat 

func RequestFormat(f Format) *CallOption

RequestFormat returns a CallOption that defines how to encode the request.

This has no effect on the response encoding. Use ResponseFormat() call option to change it.

func ResponseFormat 

func ResponseFormat(f Format) *CallOption

ResponseFormat returns a CallOption that defines how the server should encode the response.

This has no effect on the request encoding. Use RequestFormat() call option to change it.

type Client 

type Client struct {
	C       *http.Client // if nil, uses http.DefaultClient
	Host    string       // host and optionally a port number of the target server
	Options *Options     // if nil, DefaultOptions() are used

	// ErrBodySize is the number of bytes to truncate error messages from HTTP
	// responses to.
	//
	// If non-positive, defaults to 4096.
	ErrBodySize int

	// MaxResponseSize, if > 0, is the maximum response size, in bytes, that a
	// pRPC client is willing to read from the server. If a larger response is
	// sent by the server, the client will return UNAVAILABLE error with some
	// additional details attached (use ProtocolErrorDetails to extract them
	// from a gRPC error).
	//
	// This value is also sent to the server in a request header. The server MAY
	// use it to skip sending too big response. Instead the server will reply
	// with the same sort of UNAVAILABLE error (with details attached as well).
	//
	// If <= 0, DefaultMaxResponseSize will be used. Use UnlimitedMaxResponseSize
	// to disable the limit (with the risk of OOMing the client).
	MaxResponseSize int

	// MaxConcurrentRequests, if > 0, limits how many requests to the server can
	// execute at the same time. If 0 (default), there's no limit.
	//
	// If there are more concurrent Call(...) calls than the limit, excessive ones
	// will block until there are execution "slots" available or the context is
	// canceled. This waiting does not count towards PerRPCTimeout.
	//
	// The primary purpose of this mechanism is to reduce strain on the local
	// network resources such as number of HTTP connections and HTTP2 streams.
	// Note that it will not help with OOM problems, since blocked calls (and
	// their bodies) all queue up in memory anyway.
	MaxConcurrentRequests int

	// EnableRequestCompression allows the client to compress requests if they
	// are larger than a certain threshold.
	//
	// This is false by default. Use this option only with servers that understand
	// compressed requests! These are Go servers built after Aug 15 2022. Python
	// servers and olders Go servers would fail to parse the request with
	// INVALID_ARGUMENT error.
	//
	// The response compression is configured independently on the server. The
	// client always accepts compressed responses.
	EnableRequestCompression bool

	// PathPrefix is the prefix of the URL path, "<PathPrefix>/<service>/<method>"
	// when making HTTP requests. If not set, defaults to "/prpc".
	PathPrefix string
	// contains filtered or unexported fields
}

Client can make pRPC calls.

Changing fields after the first Call(...) is undefined behavior.

func (*Client) Call 

func (c *Client) Call(ctx context.Context, serviceName, methodName string, req, resp proto.Message, opts ...grpc.CallOption) error

Call performs a remote procedure call.

Used by the generated code. Calling from multiple goroutines concurrently is safe.

`opts` may include pRPC-specific options (like prpc.ExpectedCode), as well as some of gRPC standard options (but not all). Passing an unsupported gRPC call option will cause a panic.

Following gRPC options are supported:

  • grpc.Header
  • grpc.Trailer
  • grpc.StaticMethod

Propagates outgoing gRPC metadata provided via metadata.NewOutgoingContext. It will be available via metadata.FromIncomingContext on the other side. Similarly, if there is a deadline in the Context, it is be propagated to the server and applied to the context of the request handler there.

Retries on internal transient errors and on gRPC codes considered transient by grpcutil.IsTransientCode. Logs unexpected errors (see ExpectedCode call option).

Returns gRPC errors, perhaps with extra structured details if the server provided them. Context errors are converted into gRPC errors as well. See google.golang.org/grpc/status package.

func (*Client) CallWithFormats 

func (c *Client) CallWithFormats(ctx context.Context, serviceName, methodName string, req []byte, reqFormat, respFormat Format, opts ...grpc.CallOption) ([]byte, error)

CallWithFormats is like Call, but sends and returns raw data without marshaling it.

Ignores RequestFormat and ResponseFormat options in favor of explicitly passed formats. They are used to set corresponding headers on the request.

Trims JSONPBPrefix from the response if necessary.

func (*Client) Invoke 

func (c *Client) Invoke(ctx context.Context, method string, args any, reply any, opts ...grpc.CallOption) error

Invoke performs a unary RPC and returns after the response is received into reply.

It is a part of grpc.ClientConnInterface.

func (*Client) NewStream 

func (c *Client) NewStream(ctx context.Context, desc *grpc.StreamDesc, method string, opts ...grpc.CallOption) (grpc.ClientStream, error)

NewStream begins a streaming RPC.

It is a part of grpc.ClientConnInterface.

type Format 

type Format int

Format is the pRPC protobuf wire format specification. 

const (
	// FormatBinary indicates that a message is encoded as a raw binary protobuf.
	FormatBinary Format = iota
	// FormatJSONPB indicates that a message is encoded as a JSON-serialized
	// protobuf.
	FormatJSONPB
	// FormatText indicates that a message is encoded as a text protobuf.
	FormatText
)

(Ordered by preference).

func FormatFromContentType 

func FormatFromContentType(v string) (Format, error)

FormatFromContentType converts Content-Type header value from a request to a format. Can return only FormatBinary, FormatJSONPB or FormatText. In case of an error, format is undefined.

func FormatFromEncoding 

func FormatFromEncoding(v string) (Format, error)

FormatFromEncoding converts a media type encoding parameter into a pRPC Format. Can return only FormatBinary, FormatJSONPB or FormatText. In case of an error, format is undefined.

func FormatFromMediaType 

func FormatFromMediaType(mediaType string) (Format, error)

FormatFromMediaType converts a media type ContentType and its parameters into a pRPC Format. Can return only FormatBinary, FormatJSONPB or FormatText. In case of an error, format is undefined.

func (Format) IsKnown 

func (f Format) IsKnown() bool

IsKnown returns true if this value is one of the recognized values.

func (Format) MediaType 

func (f Format) MediaType() string

MediaType returns a full media type for f.

func (Format) String 

func (f Format) String() string

type Options 

type Options struct {
	// Retry controls a strategy for retrying transient RPC errors and deadlines.
	//
	// Each call to this factory should return a new retry.Iterator to use for
	// controlling retry loop of a single RPC call.
	Retry retry.Factory

	// UserAgent is the value of User-Agent HTTP header.
	//
	// If empty, DefaultUserAgent is used.
	UserAgent string

	// Insecure can be set to true to use HTTP instead of HTTPS.
	//
	// Useful for local tests.
	Insecure bool

	// PerRPCTimeout, if > 0, is a timeout that is applied to each call attempt.
	//
	// If the context passed to the call has a shorter deadline, this timeout will
	// not be applied. Otherwise, if this timeout is hit, the RPC call attempt
	// will be considered as failed transiently and it may be retried just like
	// any other transient error per Retry policy.
	PerRPCTimeout time.Duration

	// RequestFormat defines how to encode requests.
	//
	// The default value is FormatBinary (i.e. use wirepb protobuf encoding).
	//
	// Can be overridden on per-call basis via RequestFormat() call option.
	RequestFormat Format

	// ResponseFormat defines how the server should encode responses.
	//
	// The default value is FormatBinary (i.e. use wirepb protobuf encoding).
	//
	// Can be overridden on per-call basis via ResponseFormat() call option.
	ResponseFormat Format

	// Debug is a flag indicate if we want to print more logs for debug purpose.
	//
	// Right now we use this option to print the raw requests when certain
	// failures occur.
	Debug bool
	// contains filtered or unexported fields
}

Options controls how RPC requests are sent.

func DefaultOptions 

func DefaultOptions() *Options

DefaultOptions are used if no options are specified in Client.

type Override 

type Override func(rw http.ResponseWriter, req *http.Request, body func(msg proto.Message) error) (stop bool, err error)

Override is a pRPC method-specific override which may optionally handle the entire pRPC method call. If it returns true, the override is assumed to have fully handled the pRPC method call and processing of the request does not continue. In this case it's the override's responsibility to adhere to all pRPC semantics. However if it returns false, processing continues as normal, allowing the override to act as a preprocessor. In this case it's the override's responsibility to ensure it hasn't done anything that will be incompatible with pRPC semantics (such as writing garbage to the response writer in the router context).

Override receives `body` callback as an argument that can, on demand, read and decode the request body using the decoder constructed based on the request headers. This callback can be used to "peek" inside the deserialized request to decide if the override should be activated. Note that `req.Body` can be read only once, and the callback reads it. To allow reusing `req` after the callback is done, it, as a side effect, replaces `req.Body` with a byte buffer containing the data it just read. The callback can be called at most once.

type Registrar 

type Registrar interface {
	// RegisterService registers a service and its implementation.
	// Called from the generated code.
	RegisterService(desc *grpc.ServiceDesc, impl any)
}

Registrar can register a service. It is implemented by *grpc.Server and used instead of grpc.Server in the code generated by cproto.

type ResponseCompression 

type ResponseCompression string

ResponseCompression controls how the server compresses responses.

See Server doc for details. 

const (
	CompressDefault ResponseCompression = "" // same as "never"
	CompressNever   ResponseCompression = "never"
	CompressAlways  ResponseCompression = "always"
	CompressNotJSON ResponseCompression = "not JSON"
)

Possible values for ResponseCompression.

type Server 

type Server struct {
	// AccessControl, if not nil, is a callback that is invoked per request to
	// determine what CORS access control headers, if any, should be added to
	// the response.
	//
	// It controls what cross-origin RPC calls are allowed from a browser and what
	// responses cross-origin clients may see. Does not effect calls made by
	// non-browser RPC clients.
	//
	// This callback is invoked for each CORS pre-flight request as well as for
	// actual RPC requests. It can make its decision based on the origin of
	// the request.
	//
	// If nil, the server will not send any CORS headers and the browser will
	// use the default "same-origin" policy.
	//
	// See https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS for the general
	// overview of CORS policies.
	AccessControl func(ctx context.Context, origin string) AccessControlDecision

	// UnaryServerInterceptor provides a hook to intercept the execution of
	// a unary RPC on the server. It is the responsibility of the interceptor to
	// invoke handler to complete the RPC.
	UnaryServerInterceptor grpc.UnaryServerInterceptor

	// ResponseCompression controls how the server compresses responses.
	//
	// It applies only to eligible responses. A response is eligible for
	// compression if the client sends "Accept-Encoding: gzip" request header
	// (default for all Go clients, including the standard pRPC client) and
	// the response size is larger than a certain threshold.
	//
	// If ResponseCompression is CompressNever or CompressDefault, responses are
	// never compressed. This is a conservative default (since the server
	// generally doesn't know the trade off between CPU and network in the
	// environment it runs in and assumes network is cheaper; in particular this
	// situation is realized when the server is running on the localhost network).
	//
	// If ResponseCompression is CompressAlways, eligible responses are always
	// compressed.
	//
	// If ResponseCompression is CompressNotJSON, only eligible responses that
	// do **not** use JSON encoding will be compressed. JSON responses are left
	// uncompressed at this layer. This is primarily added for the Appengine
	// environment: GAE runtime compresses JSON responses on its own already,
	// presumably using a more efficient compressor (C++ and all). Note that the
	// client will see all eligible responses compressed (JSON ones will be
	// compressed by the GAE, and non-JSON ones will be compressed by the pRPC
	// server).
	//
	// A compressed response is accompanied by "Content-Encoding: gzip" response
	// header, telling the client that it should decompress it.
	//
	// The request compression is configured independently on the client. The
	// server always accepts compressed requests.
	ResponseCompression ResponseCompression

	// MaxRequestSize is how many bytes the server will read from the request body
	// before rejecting it as too big.
	//
	// This is a protection against OOMing the server by big requests.
	//
	// When using request compression the limit is checked twice: when reading
	// the original compressed request, and when decompressing it. Checking the
	// decompressed request size is done to to prevent attacks like "zip bombs"
	// where very small payloads decompress to enormous buffer sizes.
	//
	// Note that some environments impose their own request size limits. In
	// particular, AppEngine and Cloud Run (but only when using HTTP/1), have
	// a 32MiB request size limit.
	//
	// If <= 0, DefaultMaxRequestSize will be used. Use UnlimitedMaxRequestSize to
	// disable the limit (with the risk of OOMing the server).
	MaxRequestSize int

	// UseProtobufV2 is a temporary flag to opt in into using protobuf v2
	// serialization rules before them become default.
	UseProtobufV2 bool

	// EnableNonStandardFieldMasks enables support for non-standard values of
	// google.protobuf.FieldMask in requests.
	//
	// Avoid if possible, especially in new servers. This option exists primarily
	// for backward compatibility with some existing servers. Has performance and
	// maintainability risks. See below for details.
	//
	// If false, only standard field masks are supported. Such masks can only use
	// field paths composed of JSON field names (any advanced syntax like `*` is
	// forbidden). They serialize to JSON as strings. See:
	//  - https://protobuf.dev/reference/protobuf/google.protobuf/#field-mask
	//  - https://github.com/protocolbuffers/protobuf/blob/main/src/google/protobuf/field_mask.proto
	//
	// If true, field mask paths can have arbitrary values in them. Additionally,
	// field masks represented in JSONPB by objects (e.g. `{"paths": [...]}`)
	// would be accepted (in additional to the standard string form).
	//
	// WARNING: Enabling this option has performance and maintainability risks.
	// Since google.protobuf.FieldMask is a "well-known" protobuf type, rules of
	// how to serialize it to/from JSON are hardcoded in the protobuf library, and
	// this library supports only standard field masks (failing with errors if
	// masks have non-standard paths or represented as JSON objects). Non-standard
	// field masks are supported here through JSON pre-processing (which takes CPU
	// time) and deserializing pre-processed JSON through an old deprecated JSONPB
	// decoder (since it's so old it doesn't know FieldMasks are "well-known"
	// types and ignores them). This decoder may stop working when new features
	// are added to JSONPB encoding (making usage of non-standard field masks
	// a maintainability risk).
	//
	// Some related issues:
	//  - https://github.com/golang/protobuf/issues/1315
	//  - https://github.com/golang/protobuf/issues/1435
	//  - https://github.com/protocolbuffers/protobuf/issues/8547
	EnableNonStandardFieldMasks bool
	// contains filtered or unexported fields
}

Server is a pRPC server to serve RPC requests. Zero value is valid.

func (*Server) InstallHandlers 

func (s *Server) InstallHandlers(r *router.Router, base router.MiddlewareChain)

InstallHandlers installs HTTP handlers at /prpc/:service/:method.

See https://godoc.org/go.chromium.org/luci/grpc/prpc#hdr-Protocol for pRPC protocol.

Assumes incoming requests are not authenticated yet. Authentication should be performed by an interceptor (just like when using a gRPC server).

func (*Server) RegisterOverride 

func (s *Server) RegisterOverride(serviceName, methodName string, fn Override)

RegisterOverride registers an overriding function.

Panics if an override for the given service method is already registered.

func (*Server) RegisterService 

func (s *Server) RegisterService(desc *grpc.ServiceDesc, impl any)

RegisterService registers a service implementation. Called from the generated code.

desc must contain description of the service, its message types and all transitive dependencies.

Panics if a service of the same name is already registered.

func (*Server) ServiceNames 

func (s *Server) ServiceNames() []string

ServiceNames returns a sorted list of full names of all registered services.

Source Files

View all Source files

Directories

Path Synopsis
Package e2etest contains an end-to-end test of the pRPC server <-> client.
 Package e2etest contains an end-to-end test of the pRPC server <-> client.
internal
testpb
Package testpb is used internally by pRPC tests.
 Package testpb is used internally by pRPC tests.
Package prpcpb contains protobuf message used by the pRPC protocol.
 Package prpcpb contains protobuf message used by the pRPC protocol.

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