<commit_before>/*
  Go Language Raspberry Pi Interface
  (c) Copyright <NAME> 2016-2020
  All Rights Reserved
  For Licensing and Usage information, please see LICENSE.md
*/

package gopi

import (
	"context"
	"fmt"
	"net"
	"strconv"
	"strings"
	"time"
)

////////////////////////////////////////////////////////////////////////////////
// TYPES

// RPCServiceRecord defines a service which can be registered or discovered
// on the network
type RPCServiceRecord struct {
	Name    string
	Service string
	Host    string
	Port    uint16
	Addrs   []net.IP
	Txt     []string
}

type (
	RPCFlag      uint // RPCFlag is a set of flags modifying behavior
	RPCEventType uint // RPCEventType is an enumeration of event types
)

////////////////////////////////////////////////////////////////////////////////
// INTERFACES

// RPCServiceDiscovery will lookup services and classes of service
type RPCServiceDiscovery interface {
	// Lookup service instances by name
	Lookup(ctx context.Context, service string) ([]RPCServiceRecord, error)

	// Return list of service names
	EnumerateServices(ctx context.Context) ([]string, error)

	// Implements gopi.Unit
	Unit
}

// RPCServiceRegister will register services
type RPCServiceRegister interface {
	// Register service record, and de-register when deadline is exceeded
	Register(ctx context.Context, record RPCServiceRecord) error

	// Implements gopi.Unit
	Unit
}

// RPCServer serves requests for one or more services
type RPCServer interface {
	// Start an RPC server in currently running thread.
	// The method will not return until Stop is called
	// which needs to be done in a different thread
	Start() error

	// Stop RPC server. If halt is true then it immediately
	// ends the server without waiting for current requests to
	// be served
	Stop(halt bool) error

	// Return address the server is bound to, or nil if
	// the server is not running
	Addr() net.Addr

	// Implements gopi.Unit
	Unit
}

// RPCService is a driver which implements all the necessary
// methods to handle remote calls
type RPCService interface {
	// CancelRequests is called by the server to gracefully end any
	// on-going streaming requests, but before the service is shutdown
	CancelRequests() error

	// Implements gopi.Unit
	Unit
}

// RPCClientPool represents a pool of clients and connections to
// remove services
type RPCClientPool interface {
	// Lookup service records by parameter - returns records
	// which match either a service name up to max number of
	// records (or zero for unlimited). Will wait for new records
	// and block until cancelled
	Lookup(ctx context.Context, addr string, max uint) ([]RPCServiceRecord, error)

	// Connect to service by service record
	Connect(RPCServiceRecord, RPCFlag) (RPCClientConn, error)

	// Connect to service by address and port
	ConnectAddr(net.IP, uint16) (RPCClientConn, error)

	// Disconnect from service
	Disconnect(RPCClientConn) error
<commit_msg>Added ConnectFifo method to RPCClientPool<commit_after>/*
  Go Language Raspberry Pi Interface
  (c) Copyright <NAME> 2016-2020
  All Rights Reserved
  For Licensing and Usage information, please see LICENSE.md
*/

package gopi

import (
	"context"
	"fmt"
	"net"
	"strconv"
	"strings"
	"time"
)

////////////////////////////////////////////////////////////////////////////////
// TYPES

// RPCServiceRecord defines a service which can be registered or discovered
// on the network
type RPCServiceRecord struct {
	Name    string
	Service string
	Host    string
	Port    uint16
	Addrs   []net.IP
	Txt     []string
}

type (
	RPCFlag      uint // RPCFlag is a set of flags modifying behavior
	RPCEventType uint // RPCEventType is an enumeration of event types
)

////////////////////////////////////////////////////////////////////////////////
// INTERFACES

// RPCServiceDiscovery will lookup services and classes of service
type RPCServiceDiscovery interface {
	// Lookup service instances by name
	Lookup(ctx context.Context, service string) ([]RPCServiceRecord, error)

	// Return list of service names
	EnumerateServices(ctx context.Context) ([]string, error)

	// Implements gopi.Unit
	Unit
}

// RPCServiceRegister will register services
type RPCServiceRegister interface {
	// Register service record, and de-register when deadline is exceeded
	Register(ctx context.Context, record RPCServiceRecord) error

	// Implements gopi.Unit
	Unit
}

// RPCServer serves requests for one or more services
type RPCServer interface {
	// Start an RPC server in currently running thread.
	// The method will not return until Stop is called
	// which needs to be done in a different thread
	Start() error

	// Stop RPC server. If halt is true then it immediately
	// ends the server without waiting for current requests to
	// be served
	Stop(halt bool) error

	// Return address the server is bound to, or nil if
	// the server is not running
	Addr() net.Addr

	// Implements gopi.Unit
	Unit
}

// RPCService is a driver which implements all the necessary
// methods to handle remote calls
type RPCService interface {
	// CancelRequests is called by the server to gracefully end any
	// on-going streaming requests, but before the service is shutdown
	CancelRequests() error

	// Implements gopi.Unit
	Unit
}

// RPCClientPool represents a pool of clients and connections to
// remove services
type RPCClientPool interface {
	// Lookup service records by parameter - returns records
	// which match either a service name up to max number of
	// records (or zero for unlimited). Will wait for new records
	// and block until cancelled
	Lookup(ctx context.Context, addr string, max uint) ([]RPCServiceRecord, error)

	// Connect to service by service record
	Connect(RPCServiceRecord, RPCFlag) (RPCClientConn, error)

	// Connect to service by address and port
	ConnectAddr(net.IP, uint16) (RPCClientConn, error)

	// Connect to service by unix socket
	ConnectFifo(string) (RPCClientConn, error)

	// Disconnect from service
	Disconnect(RPCClientConn) error

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