path: root/node/api.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package node

import (
    "context"
    "fmt"
    "strings"
    "time"

    "github.com/ethereum/go-ethereum/common/hexutil"
    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/p2p"
    "github.com/ethereum/go-ethereum/p2p/discover"
    "github.com/ethereum/go-ethereum/rpc"
    "github.com/rcrowley/go-metrics"
)

// PrivateAdminAPI is the collection of administrative API methods exposed only
// over a secure RPC channel.
type PrivateAdminAPI struct {
    node *Node // Node interfaced by this API
}

// NewPrivateAdminAPI creates a new API definition for the private admin methods
// of the node itself.
func NewPrivateAdminAPI(node *Node) *PrivateAdminAPI {
    return &PrivateAdminAPI{node: node}
}

// AddPeer requests connecting to a remote node, and also maintaining the new
// connection at all times, even reconnecting if it is lost.
func (api *PrivateAdminAPI) AddPeer(url string) (bool, error) {
    // Make sure the server is running, fail otherwise
    server := api.node.Server()
    if server == nil {
        return false, ErrNodeStopped
    }
    // Try to add the url as a static peer and return
    node, err := discover.ParseNode(url)
    if err != nil {
        return false, fmt.Errorf("invalid enode: %v", err)
    }
    server.AddPeer(node)
    return true, nil
}

// RemovePeer disconnects from a a remote node if the connection exists
func (api *PrivateAdminAPI) RemovePeer(url string) (bool, error) {
    // Make sure the server is running, fail otherwise
    server := api.node.Server()
    if server == nil {
        return false, ErrNodeStopped
    }
    // Try to remove the url as a static peer and return
    node, err := discover.ParseNode(url)
    if err != nil {
        return false, fmt.Errorf("invalid enode: %v", err)
    }
    server.RemovePeer(node)
    return true, nil
}

// PeerEvents creates an RPC subscription which receives peer events from the
// node's p2p.Server
func (api *PrivateAdminAPI) PeerEvents(ctx context.Context) (*rpc.Subscription, error) {
    // Make sure the server is running, fail otherwise
    server := api.node.Server()
    if server == nil {
        return nil, ErrNodeStopped
    }

    // Create the subscription
    notifier, supported := rpc.NotifierFromContext(ctx)
    if !supported {
        return nil, rpc.ErrNotificationsUnsupported
    }
    rpcSub := notifier.CreateSubscription()

    go func() {
        events := make(chan *p2p.PeerEvent)
        sub := server.SubscribeEvents(events)
        defer sub.Unsubscribe()

        for {
            select {
            case event := <-events:
                notifier.Notify(rpcSub.ID, event)
            case <-sub.Err():
                return
            case <-rpcSub.Err():
                return
            case <-notifier.Closed():
                return
            }
        }
    }()

    return rpcSub, nil
}

// StartRPC starts the HTTP RPC API server.
func (api *PrivateAdminAPI) StartRPC(host *string, port *int, cors *string, apis *string, vhosts *string) (bool, error) {
    api.node.lock.Lock()
    defer api.node.lock.Unlock()

    if api.node.httpHandler != nil {
        return false, fmt.Errorf("HTTP RPC already running on %s", api.node.httpEndpoint)
    }

    if host == nil {
        h := DefaultHTTPHost
        if api.node.config.HTTPHost != "" {
            h = api.node.config.HTTPHost
        }
        host = &h
    }
    if port == nil {
        port = &api.node.config.HTTPPort
    }

    allowedOrigins := api.node.config.HTTPCors
    if cors != nil {
        allowedOrigins = nil
        for _, origin := range strings.Split(*cors, ",") {
            allowedOrigins = append(allowedOrigins, strings.TrimSpace(origin))
        }
    }

    allowedVHosts := api.node.config.HTTPVirtualHosts
    if vhosts != nil {
        allowedVHosts = nil
        for _, vhost := range strings.Split(*host, ",") {
            allowedVHosts = append(allowedVHosts, strings.TrimSpace(vhost))
        }
    }

    modules := api.node.httpWhitelist
    if apis != nil {
        modules = nil
        for _, m := range strings.Split(*apis, ",") {
            modules = append(modules, strings.TrimSpace(m))
        }
    }

    if err := api.node.startHTTP(fmt.Sprintf("%s:%d", *host, *port), api.node.rpcAPIs, modules, allowedOrigins, allowedVHosts); err != nil {
        return false, err
    }
    return true, nil
}

// StopRPC terminates an already running HTTP RPC API endpoint.
func (api *PrivateAdminAPI) StopRPC() (bool, error) {
    api.node.lock.Lock()
    defer api.node.lock.Unlock()

    if api.node.httpHandler == nil {
        return false, fmt.Errorf("HTTP RPC not running")
    }
    api.node.stopHTTP()
    return true, nil
}

// StartWS starts the websocket RPC API server.
func (api *PrivateAdminAPI) StartWS(host *string, port *int, allowedOrigins *string, apis *string) (bool, error) {
    api.node.lock.Lock()
    defer api.node.lock.Unlock()

    if api.node.wsHandler != nil {
        return false, fmt.Errorf("WebSocket RPC already running on %s", api.node.wsEndpoint)
    }

    if host == nil {
        h := DefaultWSHost
        if api.node.config.WSHost != "" {
            h = api.node.config.WSHost
        }
        host = &h
    }
    if port == nil {
        port = &api.node.config.WSPort
    }

    origins := api.node.config.WSOrigins
    if allowedOrigins != nil {
        origins = nil
        for _, origin := range strings.Split(*allowedOrigins, ",") {
            origins = append(origins, strings.TrimSpace(origin))
        }
    }

    modules := api.node.config.WSModules
    if apis != nil {
        modules = nil
        for _, m := range strings.Split(*apis, ",") {
            modules = append(modules, strings.TrimSpace(m))
        }
    }

    if err := api.node.startWS(fmt.Sprintf("%s:%d", *host, *port), api.node.rpcAPIs, modules, origins, api.node.config.WSExposeAll); err != nil {
        return false, err
    }
    return true, nil
}

// StopRPC terminates an already running websocket RPC API endpoint.
func (api *PrivateAdminAPI) StopWS() (bool, error) {
    api.node.lock.Lock()
    defer api.node.lock.Unlock()

    if api.node.wsHandler == nil {
        return false, fmt.Errorf("WebSocket RPC not running")
    }
    api.node.stopWS()
    return true, nil
}

// PublicAdminAPI is the collection of administrative API methods exposed over
// both secure and unsecure RPC channels.
type PublicAdminAPI struct {
    node *Node // Node interfaced by this API
}

// NewPublicAdminAPI creates a new API definition for the public admin methods
// of the node itself.
func NewPublicAdminAPI(node *Node) *PublicAdminAPI {
    return &PublicAdminAPI{node: node}
}

// Peers retrieves all the information we know about each individual peer at the
// protocol granularity.
func (api *PublicAdminAPI) Peers() ([]*p2p.PeerInfo, error) {
    server := api.node.Server()
    if server == nil {
        return nil, ErrNodeStopped
    }
    return server.PeersInfo(), nil
}

// NodeInfo retrieves all the information we know about the host node at the
// protocol granularity.
func (api *PublicAdminAPI) NodeInfo() (*p2p.NodeInfo, error) {
    server := api.node.Server()
    if server == nil {
        return nil, ErrNodeStopped
    }
    return server.NodeInfo(), nil
}

// Datadir retrieves the current data directory the node is using.
func (api *PublicAdminAPI) Datadir() string {
    return api.node.DataDir()
}

// PublicDebugAPI is the collection of debugging related API methods exposed over
// both secure and unsecure RPC channels.
type PublicDebugAPI struct {
    node *Node // Node interfaced by this API
}

// NewPublicDebugAPI creates a new API definition for the public debug methods
// of the node itself.
func NewPublicDebugAPI(node *Node) *PublicDebugAPI {
    return &PublicDebugAPI{node: node}
}

// Metrics retrieves all the known system metric collected by the node.
func (api *PublicDebugAPI) Metrics(raw bool) (map[string]interface{}, error) {
    // Create a rate formatter
    units := []string{"", "K", "M", "G", "T", "E", "P"}
    round := func(value float64, prec int) string {
        unit := 0
        for value >= 1000 {
            unit, value, prec = unit+1, value/1000, 2
        }
        return fmt.Sprintf(fmt.Sprintf("%%.%df%s", prec, units[unit]), value)
    }
    format := func(total float64, rate float64) string {
        return fmt.Sprintf("%s (%s/s)", round(total, 0), round(rate, 2))
    }
    // Iterate over all the metrics, and just dump for now
    counters := make(map[string]interface{})
    metrics.DefaultRegistry.Each(func(name string, metric interface{}) {
        // Create or retrieve the counter hierarchy for this metric
        root, parts := counters, strings.Split(name, "/")
        for _, part := range parts[:len(parts)-1] {
            if _, ok := root[part]; !ok {
                root[part] = make(map[string]interface{})
            }
            root = root[part].(map[string]interface{})
        }
        name = parts[len(parts)-1]

        // Fill the counter with the metric details, formatting if requested
        if raw {
            switch metric := metric.(type) {
            case metrics.Meter:
                root[name] = map[string]interface{}{
                    "AvgRate01Min": metric.Rate1(),
                    "AvgRate05Min": metric.Rate5(),
                    "AvgRate15Min": metric.Rate15(),
                    "MeanRate":     metric.RateMean(),
                    "Overall":      float64(metric.Count()),
                }

            case metrics.Timer:
                root[name] = map[string]interface{}{
                    "AvgRate01Min": metric.Rate1(),
                    "AvgRate05Min": metric.Rate5(),
                    "AvgRate15Min": metric.Rate15(),
                    "MeanRate":     metric.RateMean(),
                    "Overall":      float64(metric.Count()),
                    "Percentiles": map[string]interface{}{
                        "5":  metric.Percentile(0.05),
                        "20": metric.Percentile(0.2),
                        "50": metric.Percentile(0.5),
                        "80": metric.Percentile(0.8),
                        "95": metric.Percentile(0.95),
                    },
                }

            default:
                root[name] = "Unknown metric type"
            }
        } else {
            switch metric := metric.(type) {
            case metrics.Meter:
                root[name] = map[string]interface{}{
                    "Avg01Min": format(metric.Rate1()*60, metric.Rate1()),
                    "Avg05Min": format(metric.Rate5()*300, metric.Rate5()),
                    "Avg15Min": format(metric.Rate15()*900, metric.Rate15()),
                    "Overall":  format(float64(metric.Count()), metric.RateMean()),
                }

            case metrics.Timer:
                root[name] = map[string]interface{}{
                    "Avg01Min": format(metric.Rate1()*60, metric.Rate1()),
                    "Avg05Min": format(metric.Rate5()*300, metric.Rate5()),
                    "Avg15Min": format(metric.Rate15()*900, metric.Rate15()),
                    "Overall":  format(float64(metric.Count()), metric.RateMean()),
                    "Maximum":  time.Duration(metric.Max()).String(),
                    "Minimum":  time.Duration(metric.Min()).String(),
                    "Percentiles": map[string]interface{}{
                        "5":  time.Duration(metric.Percentile(0.05)).String(),
                        "20": time.Duration(metric.Percentile(0.2)).String(),
                        "50": time.Duration(metric.Percentile(0.5)).String(),
                        "80": time.Duration(metric.Percentile(0.8)).String(),
                        "95": time.Duration(metric.Percentile(0.95)).String(),
                    },
                }

            default:
                root[name] = "Unknown metric type"
            }
        }
    })
    return counters, nil
}

// PublicWeb3API offers helper utils
type PublicWeb3API struct {
    stack *Node
}

// NewPublicWeb3API creates a new Web3Service instance
func NewPublicWeb3API(stack *Node) *PublicWeb3API {
    return &PublicWeb3API{stack}
}

// ClientVersion returns the node name
func (s *PublicWeb3API) ClientVersion() string {
    return s.stack.Server().Name
}

// Sha3 applies the ethereum sha3 implementation on the input.
// It assumes the input is hex encoded.
func (s *PublicWeb3API) Sha3(input hexutil.Bytes) hexutil.Bytes {
    return crypto.Keccak256(input)
}