frontend

package
v0.6.1 Latest Latest
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 Go to latest Published: Feb 5, 2020 License: Apache-2.0 Imports: 31 Imported by: 0

Documentation

Index

Constants

This section is empty.

Variables

View Source 
var (
	ErrInvalidLengthFrontend = fmt.Errorf("proto: negative length found during unmarshaling")
	ErrIntOverflowFrontend   = fmt.Errorf("proto: integer overflow")
)

Functions

func RegisterFrontendServer 

func RegisterFrontendServer(s *grpc.Server, srv FrontendServer)

Types

type Config 

type Config struct {
	MaxOutstandingPerTenant int           `yaml:"max_outstanding_per_tenant"`
	CompressResponses       bool          `yaml:"compress_responses"`
	DownstreamURL           string        `yaml:"downstream"`
	LogQueriesLongerThan    time.Duration `yaml:"log_queries_longer_than"`
}

Config for a Frontend.

func (*Config) RegisterFlags 

func (cfg *Config) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

type Frontend 

type Frontend struct {
	// contains filtered or unexported fields
}

Frontend queues HTTP requests, dispatches them to backends, and handles retries for requests which failed.

func New 

func New(cfg Config, log log.Logger) (*Frontend, error)

New creates a new frontend.

func (*Frontend) Close 

func (f *Frontend) Close()

Close stops new requests and errors out any pending requests.

func (*Frontend) Handler 

func (f *Frontend) Handler() http.Handler

Handler for HTTP requests.

func (*Frontend) Process 

func (f *Frontend) Process(server Frontend_ProcessServer) error

Process allows backends to pull requests from the frontend.

func (*Frontend) RoundTrip 

func (f *Frontend) RoundTrip(r *http.Request) (*http.Response, error)

RoundTrip implement http.Transport.

func (*Frontend) RoundTripGRPC 

func (f *Frontend) RoundTripGRPC(ctx context.Context, req *ProcessRequest) (*ProcessResponse, error)

RoundTripGRPC round trips a proto (instead of a HTTP request).

func (*Frontend) Wrap added in v0.4.0 

func (f *Frontend) Wrap(trw Tripperware)

Wrap uses a Tripperware to chain a new RoundTripper to the frontend.

type FrontendClient 

type FrontendClient interface {
	Process(ctx context.Context, opts ...grpc.CallOption) (Frontend_ProcessClient, error)
}

FrontendClient is the client API for Frontend service.

For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.

func NewFrontendClient 

func NewFrontendClient(cc *grpc.ClientConn) FrontendClient

type FrontendServer 

type FrontendServer interface {
	Process(Frontend_ProcessServer) error
}

FrontendServer is the server API for Frontend service.

type Frontend_ProcessClient 

type Frontend_ProcessClient interface {
	Send(*ProcessResponse) error
	Recv() (*ProcessRequest, error)
	grpc.ClientStream
}

type Frontend_ProcessServer 

type Frontend_ProcessServer interface {
	Send(*ProcessRequest) error
	Recv() (*ProcessResponse, error)
	grpc.ServerStream
}

type ProcessRequest 

type ProcessRequest struct {
	HttpRequest *httpgrpc.HTTPRequest `protobuf:"bytes,1,opt,name=httpRequest,proto3" json:"httpRequest,omitempty"`
}

func (*ProcessRequest) Descriptor 

func (*ProcessRequest) Descriptor() ([]byte, []int)

func (*ProcessRequest) Equal 

func (this *ProcessRequest) Equal(that interface{}) bool

func (*ProcessRequest) GetHttpRequest 

func (m *ProcessRequest) GetHttpRequest() *httpgrpc.HTTPRequest

func (*ProcessRequest) GoString 

func (this *ProcessRequest) GoString() string

func (*ProcessRequest) Marshal 

func (m *ProcessRequest) Marshal() (dAtA []byte, err error)

func (*ProcessRequest) MarshalTo 

func (m *ProcessRequest) MarshalTo(dAtA []byte) (int, error)

func (*ProcessRequest) ProtoMessage 

func (*ProcessRequest) ProtoMessage()

func (*ProcessRequest) Reset 

func (m *ProcessRequest) Reset()

func (*ProcessRequest) Size 

func (m *ProcessRequest) Size() (n int)

func (*ProcessRequest) String 

func (this *ProcessRequest) String() string

func (*ProcessRequest) Unmarshal 

func (m *ProcessRequest) Unmarshal(dAtA []byte) error

func (*ProcessRequest) XXX_DiscardUnknown 

func (m *ProcessRequest) XXX_DiscardUnknown()

func (*ProcessRequest) XXX_Marshal 

func (m *ProcessRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*ProcessRequest) XXX_Merge 

func (m *ProcessRequest) XXX_Merge(src proto.Message)

func (*ProcessRequest) XXX_Size 

func (m *ProcessRequest) XXX_Size() int

func (*ProcessRequest) XXX_Unmarshal 

func (m *ProcessRequest) XXX_Unmarshal(b []byte) error

type ProcessResponse 

type ProcessResponse struct {
	HttpResponse *httpgrpc.HTTPResponse `protobuf:"bytes,1,opt,name=httpResponse,proto3" json:"httpResponse,omitempty"`
}

func (*ProcessResponse) Descriptor 

func (*ProcessResponse) Descriptor() ([]byte, []int)

func (*ProcessResponse) Equal 

func (this *ProcessResponse) Equal(that interface{}) bool

func (*ProcessResponse) GetHttpResponse 

func (m *ProcessResponse) GetHttpResponse() *httpgrpc.HTTPResponse

func (*ProcessResponse) GoString 

func (this *ProcessResponse) GoString() string

func (*ProcessResponse) Marshal 

func (m *ProcessResponse) Marshal() (dAtA []byte, err error)

func (*ProcessResponse) MarshalTo 

func (m *ProcessResponse) MarshalTo(dAtA []byte) (int, error)

func (*ProcessResponse) ProtoMessage 

func (*ProcessResponse) ProtoMessage()

func (*ProcessResponse) Reset 

func (m *ProcessResponse) Reset()

func (*ProcessResponse) Size 

func (m *ProcessResponse) Size() (n int)

func (*ProcessResponse) String 

func (this *ProcessResponse) String() string

func (*ProcessResponse) Unmarshal 

func (m *ProcessResponse) Unmarshal(dAtA []byte) error

func (*ProcessResponse) XXX_DiscardUnknown 

func (m *ProcessResponse) XXX_DiscardUnknown()

func (*ProcessResponse) XXX_Marshal 

func (m *ProcessResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error)

func (*ProcessResponse) XXX_Merge 

func (m *ProcessResponse) XXX_Merge(src proto.Message)

func (*ProcessResponse) XXX_Size 

func (m *ProcessResponse) XXX_Size() int

func (*ProcessResponse) XXX_Unmarshal 

func (m *ProcessResponse) XXX_Unmarshal(b []byte) error

type RoundTripFunc added in v0.2.0 

type RoundTripFunc func(*http.Request) (*http.Response, error)

RoundTripFunc is to http.RoundTripper what http.HandlerFunc is to http.Handler.

func (RoundTripFunc) RoundTrip added in v0.2.0 

func (f RoundTripFunc) RoundTrip(r *http.Request) (*http.Response, error)

RoundTrip implements http.RoundTripper.

type Tripperware added in v0.4.0 

type Tripperware func(http.RoundTripper) http.RoundTripper

Tripperware is a signature for all http client-side middleware.

type Worker 

type Worker interface {
	Stop()
}

Worker is the counter-part to the frontend, actually processing requests.

func NewWorker 

func NewWorker(cfg WorkerConfig, server *server.Server, log log.Logger) (Worker, error)

NewWorker creates a new Worker.

type WorkerConfig 

type WorkerConfig struct {
	Address           string
	Parallelism       int
	DNSLookupDuration time.Duration

	GRPCClientConfig grpcclient.Config `yaml:"grpc_client_config"`
}

WorkerConfig is config for a worker.

func (*WorkerConfig) RegisterFlags 

func (cfg *WorkerConfig) RegisterFlags(f *flag.FlagSet)

RegisterFlags adds the flags required to config this to the given FlagSet.

Source Files

View all Source files

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