commit b57628ea9f3b4f8f15198f77578b921b0b142b31
Author: Josh Rickmar <jrick@conformal.com>
Date:   Wed Nov 6 11:10:22 2013 -0500

    Initial commit.

diff --git a/LICENSE b/LICENSE
new file mode 100644
index 00000000..62a53cea
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,13 @@
+Copyright (c) 2013 Conformal Systems LLC.
+
+Permission to use, copy, modify, and distribute this software for any
+purpose with or without fee is hereby granted, provided that the above
+copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
diff --git a/cmds.go b/cmds.go
new file mode 100644
index 00000000..8e8eb234
--- /dev/null
+++ b/cmds.go
@@ -0,0 +1,470 @@
+// Copyright (c) 2013 Conformal Systems LLC.
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+package btcws
+
+import (
+	"encoding/json"
+	"errors"
+	"github.com/conformal/btcdb"
+	"github.com/conformal/btcjson"
+	"github.com/conformal/btcwire"
+)
+
+func init() {
+	btcjson.RegisterCustomCmd("getcurrentnet", parseGetCurrentNetCmd)
+	btcjson.RegisterCustomCmd("getbestblock", parseGetBestBlockCmd)
+	btcjson.RegisterCustomCmd("rescan", parseRescanCmd)
+	btcjson.RegisterCustomCmd("notifynewtxs", parseNotifyNewTXsCmd)
+	btcjson.RegisterCustomCmd("notifyspent", parseNotifySpentCmd)
+}
+
+// GetCurrentNetCmd is a type handling custom marshaling and
+// unmarshaling of getcurrentnet JSON websocket extension
+// commands.
+type GetCurrentNetCmd struct {
+	id interface{}
+}
+
+// Enforce that GetCurrentNetCmd satisifies the btcjson.Cmd interface.
+var _ btcjson.Cmd = &GetCurrentNetCmd{}
+
+// NewGetCurrentNetCmd creates a new GetCurrentNetCmd.
+func NewGetCurrentNetCmd(id interface{}) *GetCurrentNetCmd {
+	return &GetCurrentNetCmd{id: id}
+}
+
+// parseGetCurrentNetCmd parses a RawCmd into a concrete type satisifying
+// the btcjson.Cmd interface.  This is used when registering the custom
+// command with the btcjson parser.
+func parseGetCurrentNetCmd(r *btcjson.RawCmd) (btcjson.Cmd, error) {
+	if len(r.Params) != 0 {
+		return nil, btcjson.ErrWrongNumberOfParams
+	}
+
+	return NewGetCurrentNetCmd(r.Id), nil
+}
+
+// Id satisifies the Cmd interface by returning the ID of the command.
+func (cmd *GetCurrentNetCmd) Id() interface{} {
+	return cmd.id
+}
+
+// Method satisfies the Cmd interface by returning the RPC method.
+func (cmd *GetCurrentNetCmd) Method() string {
+	return "getcurrentnet"
+}
+
+// MarshalJSON returns the JSON encoding of cmd.  Part of the Cmd interface.
+func (cmd *GetCurrentNetCmd) MarshalJSON() ([]byte, error) {
+	// Fill a RawCmd and marshal.
+	raw := btcjson.RawCmd{
+		Jsonrpc: "1.0",
+		Method:  "getcurrentnet",
+		Id:      cmd.id,
+	}
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON unmarshals the JSON encoding of cmd into cmd.  Part of
+// the Cmd interface.
+func (cmd *GetCurrentNetCmd) UnmarshalJSON(b []byte) error {
+	// Unmarshal into a RawCmd.
+	var r btcjson.RawCmd
+	if err := json.Unmarshal(b, &r); err != nil {
+		return err
+	}
+
+	newCmd, err := parseGetCurrentNetCmd(&r)
+	if err != nil {
+		return err
+	}
+
+	concreteCmd, ok := newCmd.(*GetCurrentNetCmd)
+	if !ok {
+		return btcjson.ErrInternal
+	}
+	*cmd = *concreteCmd
+	return nil
+}
+
+// GetBestBlockCmd is a type handling custom marshaling and
+// unmarshaling of getbestblock JSON websocket extension
+// commands.
+type GetBestBlockCmd struct {
+	id interface{}
+}
+
+// Enforce that GetBestBlockCmd satisifies the btcjson.Cmd interface.
+var _ btcjson.Cmd = &GetBestBlockCmd{}
+
+// NewGetBestBlockCmd creates a new GetBestBlock.
+func NewGetBestBlockCmd(id interface{}) *GetBestBlockCmd {
+	return &GetBestBlockCmd{id: id}
+}
+
+// parseGetBestBlockCmd parses a RawCmd into a concrete type satisifying
+// the btcjson.Cmd interface.  This is used when registering the custom
+// command with the btcjson parser.
+func parseGetBestBlockCmd(r *btcjson.RawCmd) (btcjson.Cmd, error) {
+	if len(r.Params) != 0 {
+		return nil, btcjson.ErrWrongNumberOfParams
+	}
+
+	return NewGetBestBlockCmd(r.Id), nil
+}
+
+// Id satisifies the Cmd interface by returning the ID of the command.
+func (cmd *GetBestBlockCmd) Id() interface{} {
+	return cmd.id
+}
+
+// Method satisfies the Cmd interface by returning the RPC method.
+func (cmd *GetBestBlockCmd) Method() string {
+	return "getbestblock"
+}
+
+// MarshalJSON returns the JSON encoding of cmd.  Part of the Cmd interface.
+func (cmd *GetBestBlockCmd) MarshalJSON() ([]byte, error) {
+	// Fill a RawCmd and marshal.
+	raw := btcjson.RawCmd{
+		Jsonrpc: "1.0",
+		Method:  "getbestblock",
+		Id:      cmd.id,
+	}
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON unmarshals the JSON encoding of cmd into cmd.  Part of
+// the Cmd interface.
+func (cmd *GetBestBlockCmd) UnmarshalJSON(b []byte) error {
+	// Unmarshal into a RawCmd.
+	var r btcjson.RawCmd
+	if err := json.Unmarshal(b, &r); err != nil {
+		return err
+	}
+
+	newCmd, err := parseGetBestBlockCmd(&r)
+	if err != nil {
+		return err
+	}
+
+	concreteCmd, ok := newCmd.(*GetBestBlockCmd)
+	if !ok {
+		return btcjson.ErrInternal
+	}
+	*cmd = *concreteCmd
+	return nil
+}
+
+// RescanCmd is a type handling custom marshaling and
+// unmarshaling of rescan JSON websocket extension
+// commands.
+type RescanCmd struct {
+	id         interface{}
+	BeginBlock int32
+	Addresses  map[string]struct{}
+	EndBlock   int64 // TODO: switch this and btcdb.AllShas to int32
+}
+
+// Enforce that RescanCmd satisifies the btcjson.Cmd interface.
+var _ btcjson.Cmd = &RescanCmd{}
+
+// NewRescanCmd creates a new RescanCmd, parsing the optional
+// arguments optArgs which may either be empty or a single upper
+// block height.
+func NewRescanCmd(id interface{}, begin int32, addresses map[string]struct{},
+	optArgs ...int64) (*RescanCmd, error) {
+
+	// Optional parameters set to their defaults.
+	end := btcdb.AllShas
+
+	if len(optArgs) > 0 {
+		if len(optArgs) > 1 {
+			return nil, btcjson.ErrTooManyOptArgs
+		}
+		end = optArgs[0]
+	}
+
+	return &RescanCmd{
+		id:         id,
+		BeginBlock: begin,
+		Addresses:  addresses,
+		EndBlock:   end,
+	}, nil
+}
+
+// parseRescanCmd parses a RawCmd into a concrete type satisifying
+// the btcjson.Cmd interface.  This is used when registering the custom
+// command with the btcjson parser.
+func parseRescanCmd(r *btcjson.RawCmd) (btcjson.Cmd, error) {
+	if len(r.Params) < 2 {
+		return nil, btcjson.ErrWrongNumberOfParams
+	}
+
+	begin, ok := r.Params[0].(float64)
+	if !ok {
+		return nil, errors.New("first parameter must be a number")
+	}
+	iaddrs, ok := r.Params[1].(map[string]interface{})
+	if !ok {
+		return nil, errors.New("second parameter must be a JSON object")
+	}
+	addresses := make(map[string]struct{}, len(iaddrs))
+	for addr := range iaddrs {
+		addresses[addr] = struct{}{}
+	}
+	params := make([]int64, len(r.Params[2:]))
+	for i, val := range r.Params[2:] {
+		fval, ok := val.(float64)
+		if !ok {
+			return nil, errors.New("optional parameters must " +
+				"be be numbers")
+		}
+		params[i] = int64(fval)
+	}
+
+	return NewRescanCmd(r.Id, int32(begin), addresses, params...)
+}
+
+// Id satisifies the Cmd interface by returning the ID of the command.
+func (cmd *RescanCmd) Id() interface{} {
+	return cmd.id
+}
+
+// Method satisfies the Cmd interface by returning the RPC method.
+func (cmd *RescanCmd) Method() string {
+	return "rescan"
+}
+
+// MarshalJSON returns the JSON encoding of cmd.  Part of the Cmd interface.
+func (cmd *RescanCmd) MarshalJSON() ([]byte, error) {
+	// Fill a RawCmd and marshal.
+	raw := btcjson.RawCmd{
+		Jsonrpc: "1.0",
+		Method:  "rescan",
+		Id:      cmd.id,
+		Params: []interface{}{
+			cmd.BeginBlock,
+			cmd.Addresses,
+		},
+	}
+
+	if cmd.EndBlock != btcdb.AllShas {
+		raw.Params = append(raw.Params, cmd.EndBlock)
+	}
+
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON unmarshals the JSON encoding of cmd into cmd.  Part of
+// the Cmd interface.
+func (cmd *RescanCmd) UnmarshalJSON(b []byte) error {
+	// Unmarshal into a RawCmd.
+	var r btcjson.RawCmd
+	if err := json.Unmarshal(b, &r); err != nil {
+		return err
+	}
+
+	newCmd, err := parseRescanCmd(&r)
+	if err != nil {
+		return err
+	}
+
+	concreteCmd, ok := newCmd.(*RescanCmd)
+	if !ok {
+		return btcjson.ErrInternal
+	}
+	*cmd = *concreteCmd
+	return nil
+}
+
+// NotifyNewTXsCmd is a type handling custom marshaling and
+// unmarshaling of notifynewtxs JSON websocket extension
+// commands.
+type NotifyNewTXsCmd struct {
+	id        interface{}
+	Addresses []string
+}
+
+// Enforce that NotifyNewTXsCmd satisifies the btcjson.Cmd interface.
+var _ btcjson.Cmd = &NotifyNewTXsCmd{}
+
+// NewNotifyNewTXsCmd creates a new RescanCmd, parsing the optional
+// arguments optArgs which may either be empty or a
+func NewNotifyNewTXsCmd(id interface{}, addresses []string) *NotifyNewTXsCmd {
+	return &NotifyNewTXsCmd{
+		id:        id,
+		Addresses: addresses,
+	}
+}
+
+// parseNotifyNewTXsCmd parses a NotifyNewTXsCmd into a concrete type
+// satisifying the btcjson.Cmd interface.  This is used when registering
+// the custom command with the btcjson parser.
+func parseNotifyNewTXsCmd(r *btcjson.RawCmd) (btcjson.Cmd, error) {
+	if len(r.Params) != 1 {
+		return nil, btcjson.ErrWrongNumberOfParams
+	}
+
+	iaddrs, ok := r.Params[0].([]interface{})
+	if !ok {
+		return nil, errors.New("first parameter must be a JSON array")
+	}
+	addresses := make([]string, len(iaddrs))
+	for i := range iaddrs {
+		addr, ok := iaddrs[i].(string)
+		if !ok {
+			return nil, errors.New("first parameter must be an " +
+				"array of strings")
+		}
+		addresses[i] = addr
+	}
+
+	return NewNotifyNewTXsCmd(r.Id, addresses), nil
+}
+
+// Id satisifies the Cmd interface by returning the ID of the command.
+func (cmd *NotifyNewTXsCmd) Id() interface{} {
+	return cmd.id
+}
+
+// Method satisfies the Cmd interface by returning the RPC method.
+func (cmd *NotifyNewTXsCmd) Method() string {
+	return "notifynewtxs"
+}
+
+// MarshalJSON returns the JSON encoding of cmd.  Part of the Cmd interface.
+func (cmd *NotifyNewTXsCmd) MarshalJSON() ([]byte, error) {
+	// Fill a RawCmd and marshal.
+	raw := btcjson.RawCmd{
+		Jsonrpc: "1.0",
+		Method:  "notifynewtxs",
+		Id:      cmd.id,
+		Params: []interface{}{
+			cmd.Addresses,
+		},
+	}
+
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON unmarshals the JSON encoding of cmd into cmd.  Part of
+// the Cmd interface.
+func (cmd *NotifyNewTXsCmd) UnmarshalJSON(b []byte) error {
+	// Unmarshal into a RawCmd.
+	var r btcjson.RawCmd
+	if err := json.Unmarshal(b, &r); err != nil {
+		return err
+	}
+
+	newCmd, err := parseNotifyNewTXsCmd(&r)
+	if err != nil {
+		return err
+	}
+
+	concreteCmd, ok := newCmd.(*NotifyNewTXsCmd)
+	if !ok {
+		return btcjson.ErrInternal
+	}
+	*cmd = *concreteCmd
+	return nil
+}
+
+// NotifySpentCmd is a type handling custom marshaling and
+// unmarshaling of notifyspent JSON websocket extension
+// commands.
+type NotifySpentCmd struct {
+	id interface{}
+	*btcwire.OutPoint
+}
+
+// Enforce that NotifySpentCmd satisifies the btcjson.Cmd interface.
+var _ btcjson.Cmd = &NotifySpentCmd{}
+
+// NewNotifySpentCmd creates a new RescanCmd, parsing the optional
+// arguments optArgs which may either be empty or a
+func NewNotifySpentCmd(id interface{}, op *btcwire.OutPoint) *NotifySpentCmd {
+	return &NotifySpentCmd{
+		id:       id,
+		OutPoint: op,
+	}
+}
+
+// parseNotifySpentCmd parses a NotifySpentCmd into a concrete type
+// satisifying the btcjson.Cmd interface.  This is used when registering
+// the custom command with the btcjson parser.
+func parseNotifySpentCmd(r *btcjson.RawCmd) (btcjson.Cmd, error) {
+	if len(r.Params) != 2 {
+		return nil, btcjson.ErrWrongNumberOfParams
+	}
+
+	hashStr, ok := r.Params[0].(string)
+	if !ok {
+		return nil, errors.New("first parameter must be a string")
+	}
+	hash, err := btcwire.NewShaHashFromStr(hashStr)
+	if err != nil {
+		return nil, errors.New("first parameter is not a valid " +
+			"hash string")
+	}
+	idx, ok := r.Params[1].(float64)
+	if !ok {
+		return nil, errors.New("second parameter is not a number")
+	}
+	if idx < 0 {
+		return nil, errors.New("second parameter cannot be negative")
+	}
+
+	cmd := NewNotifySpentCmd(r.Id, btcwire.NewOutPoint(hash, uint32(idx)))
+	return cmd, nil
+}
+
+// Id satisifies the Cmd interface by returning the ID of the command.
+func (cmd *NotifySpentCmd) Id() interface{} {
+	return cmd.id
+}
+
+// Method satisfies the Cmd interface by returning the RPC method.
+func (cmd *NotifySpentCmd) Method() string {
+	return "notifyspent"
+}
+
+// MarshalJSON returns the JSON encoding of cmd.  Part of the Cmd interface.
+func (cmd *NotifySpentCmd) MarshalJSON() ([]byte, error) {
+	// Fill a RawCmd and marshal.
+	raw := btcjson.RawCmd{
+		Jsonrpc: "1.0",
+		Method:  "notifyspent",
+		Id:      cmd.id,
+		Params: []interface{}{
+			cmd.OutPoint.Hash.String(),
+			cmd.OutPoint.Index,
+		},
+	}
+
+	return json.Marshal(raw)
+}
+
+// UnmarshalJSON unmarshals the JSON encoding of cmd into cmd.  Part of
+// the Cmd interface.
+func (cmd *NotifySpentCmd) UnmarshalJSON(b []byte) error {
+	// Unmarshal into a RawCmd.
+	var r btcjson.RawCmd
+	if err := json.Unmarshal(b, &r); err != nil {
+		return err
+	}
+
+	newCmd, err := parseNotifySpentCmd(&r)
+	if err != nil {
+		return err
+	}
+
+	concreteCmd, ok := newCmd.(*NotifySpentCmd)
+	if !ok {
+		return btcjson.ErrInternal
+	}
+	*cmd = *concreteCmd
+	return nil
+}