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@ -1,220 +1,55 @@
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package namecoin
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// btcjson had to be modified a bit to get correct error reporting.
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import (
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extratypes "github.com/hlandau/ncbtcjsontypes"
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"github.com/hlandauf/btcjson"
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"gopkg.in/hlandau/madns.v2/merr"
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"expvar"
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"fmt"
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"sync/atomic"
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)
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var cQueryCalls = expvar.NewInt("ncdns.namecoin.numQueryCalls")
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var cSyncCalls = expvar.NewInt("ncdns.namecoin.numSyncCalls")
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var cFilterCalls = expvar.NewInt("ncdns.namecoin.numFilterCalls")
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var cScanCalls = expvar.NewInt("ncdns.namecoin.numScanCalls")
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var cCurHeightCalls = expvar.NewInt("ncdns.namecoin.numCurHeightCalls")
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// Used for generating IDs for JSON-RPC requests.
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var idCounter int32
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func newID() int32 {
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return atomic.AddInt32(&idCounter, 1)
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}
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// Used to query a Namecoin JSON-RPC interface. Initialize the struct with a
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// username, password, and address (hostname:port).
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type Conn struct {
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Username string
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Password string
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// If set, this is called to obtain the username and password instead of
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// using the Username and Password fields.
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GetAuth func() (username, password string, err error)
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Server string
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}
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"github.com/namecoin/btcd/btcjson"
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"github.com/namecoin/btcd/rpcclient"
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"gopkg.in/hlandau/madns.v2/merr"
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func (nc *Conn) getAuth() (username string, password string, err error) {
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if nc.GetAuth == nil {
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return nc.Username, nc.Password, nil
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}
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"github.com/namecoin/ncrpcclient"
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)
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return nc.GetAuth()
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// Client represents an ncrpcclient.Client with an additional DNS-friendly
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// convenience wrapper around NameShow.
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type Client struct {
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*ncrpcclient.Client
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}
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func (nc *Conn) rpcSend(cmd btcjson.Cmd) (btcjson.Reply, error) {
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username, password, err := nc.getAuth()
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func New(config *rpcclient.ConnConfig, ntfnHandlers *rpcclient.NotificationHandlers) (*Client, error) {
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ncClient, err := ncrpcclient.New(config, ntfnHandlers)
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if err != nil {
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return btcjson.Reply{}, err
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return nil, err
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}
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return btcjson.RpcSend(username, password, nc.Server, cmd)
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return &Client{ncClient}, nil
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}
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// Query the Namecoin daemon for a Namecoin domain (e.g. d/example).
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// If the domain exists, returns the value stored in Namecoin, which should be JSON.
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// Note that this will return domain data even if the domain is expired.
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func (nc *Conn) Query(name string, streamIsolationID string) (v string, err error) {
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cQueryCalls.Add(1)
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// NameQuery returns the value of a name. If the name doesn't exist, the error
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// returned will be merr.ErrNoSuchDomain.
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func (c *Client) NameQuery(name string, streamIsolationID string) (string, error) {
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// TODO: Pass stream isolation ID to namecoind, and remove this error
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if streamIsolationID != "" {
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return "", fmt.Errorf("Stream isolation ID '%s' is not yet passed to namecoind", streamIsolationID)
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}
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cmd, err := extratypes.NewNameShowCmd(newID(), name)
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if err != nil {
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//log.Info("NC NEWCMD ", err)
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return "", err
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}
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r, err := nc.rpcSend(cmd)
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if err != nil {
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return "", err
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}
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if r.Error != nil {
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//log.Info("RPC error: ", r.Error)
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if r.Error.Code == -4 {
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return "", merr.ErrNoSuchDomain
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}
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return "", r.Error
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}
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if r.Result == nil {
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//log.Info("NC NILRESULT")
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return "", fmt.Errorf("got nil result")
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}
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if nsr, ok := r.Result.(*extratypes.NameShowReply); ok {
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//log.Info("NC OK")
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return nsr.Value, nil
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}
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//log.Info("NC BADREPLY")
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return "", fmt.Errorf("bad reply")
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}
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var ErrSyncNoSuchBlock = fmt.Errorf("no block exists with given hash")
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const rpcInvalidAddressOrKey = -5
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func (nc *Conn) Sync(hash string, count int, wait bool) ([]extratypes.NameSyncEvent, error) {
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cSyncCalls.Add(1)
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cmd, err := extratypes.NewNameSyncCmd(newID(), hash, count, wait)
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if err != nil {
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return nil, err
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}
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r, err := nc.rpcSend(cmd)
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nameData, err := c.NameShow(name)
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if err != nil {
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return nil, err
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}
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if r.Error != nil {
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if r.Error.Code == rpcInvalidAddressOrKey {
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return nil, ErrSyncNoSuchBlock
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if jerr, ok := err.(*btcjson.RPCError); ok {
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if jerr.Code == btcjson.ErrRPCWallet {
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// ErrRPCWallet from name_show indicates that
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// the name does not exist.
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return "", merr.ErrNoSuchDomain
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}
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}
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return nil, r.Error
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}
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if r.Result == nil {
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return nil, fmt.Errorf("got nil result")
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}
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if nsr, ok := r.Result.(extratypes.NameSyncReply); ok {
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return []extratypes.NameSyncEvent(nsr), nil
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}
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return nil, fmt.Errorf("bad reply")
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}
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func (nc *Conn) CurHeight() (int, error) {
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cCurHeightCalls.Add(1)
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cmd, err := btcjson.NewGetInfoCmd(newID())
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if err != nil {
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return 0, err
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}
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r, err := nc.rpcSend(cmd)
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if err != nil {
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return 0, err
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}
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if r.Error != nil {
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return 0, r.Error
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}
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if r.Result == nil {
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return 0, fmt.Errorf("got nil result")
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}
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if rep, ok := r.Result.(*btcjson.InfoResult); ok {
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return int(rep.Blocks), nil
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}
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return 0, fmt.Errorf("bad reply")
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}
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func (nc *Conn) Filter(regexp string, maxage, from, count int) (names []extratypes.NameFilterItem, err error) {
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cFilterCalls.Add(1)
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cmd, err := extratypes.NewNameFilterCmd(newID(), regexp, maxage, from, count)
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if err != nil {
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return nil, err
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}
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r, err := nc.rpcSend(cmd)
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if err != nil {
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return nil, err
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}
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if r.Error != nil {
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return nil, r.Error
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}
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if r.Result == nil {
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return nil, fmt.Errorf("got nil result")
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}
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if nsr, ok := r.Result.(extratypes.NameFilterReply); ok {
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return []extratypes.NameFilterItem(nsr), nil
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}
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return nil, fmt.Errorf("bad reply")
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}
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func (nc *Conn) Scan(from string, count int) (names []extratypes.NameFilterItem, err error) {
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cScanCalls.Add(1)
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cmd, err := extratypes.NewNameScanCmd(newID(), from, count)
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if err != nil {
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return nil, err
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}
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r, err := nc.rpcSend(cmd)
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if err != nil {
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return nil, err
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}
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if r.Error != nil {
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return nil, r.Error
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// Some error besides NXDOMAIN happened; pass that error
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// through unaltered.
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return "", err
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}
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if r.Result == nil {
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return nil, fmt.Errorf("got nil result")
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}
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// TODO: check the "value_error" field for errors and report those to the caller.
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if nsr, ok := r.Result.(extratypes.NameFilterReply); ok {
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return []extratypes.NameFilterItem(nsr), nil
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}
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return nil, fmt.Errorf("bad reply")
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// We got the name data. Return the value.
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return nameData.Value, nil
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}
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// © 2014 Hugo Landau <hlandau@devever.net> GPLv3 or later
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JeremyRand
5 years ago