mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
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90caa2cabb
* p2p: new dial scheduler This change replaces the peer-to-peer dial scheduler with a new and improved implementation. The new code is better than the previous implementation in two key aspects: - The time between discovery of a node and dialing that node is significantly lower in the new version. The old dialState kept a buffer of nodes and launched a task to refill it whenever the buffer became empty. This worked well with the discovery interface we used to have, but doesn't really work with the new iterator-based discovery API. - Selection of static dial candidates (created by Server.AddPeer or through static-nodes.json) performs much better for large amounts of static peers. Connections to static nodes are now limited like dynanic dials and can no longer overstep MaxPeers or the dial ratio. * p2p/simulations/adapters: adapt to new NodeDialer interface * p2p: re-add check for self in checkDial * p2p: remove peersetCh * p2p: allow static dials when discovery is disabled * p2p: add test for dialScheduler.removeStatic * p2p: remove blank line * p2p: fix documentation of maxDialPeers * p2p: change "ok" to "added" in static node log * p2p: improve dialTask docs Also increase log level for "Can't resolve node" * p2p: ensure dial resolver is truly nil without discovery * p2p: add "looking for peers" log message * p2p: clean up Server.run comments * p2p: fix maxDialedConns for maxpeers < dialRatio Always allocate at least one dial slot unless dialing is disabled using NoDial or MaxPeers == 0. Most importantly, this fixes MaxPeers == 1 to dedicate the sole slot to dialing instead of listening. * p2p: fix RemovePeer to disconnect the peer again Also make RemovePeer synchronous and add a test. * p2p: remove "Connection set up" log message * p2p: clean up connection logging We previously logged outgoing connection failures up to three times. - in SetupConn() as "Setting up connection failed addr=..." - in setupConn() with an error-specific message and "id=... addr=..." - in dial() as "Dial error task=..." This commit ensures a single log message is emitted per failure and adds "id=... addr=... conn=..." everywhere (id= omitted when the ID isn't known yet). Also avoid printing a log message when a static dial fails but can't be resolved because discv4 is disabled. The light client hit this case all the time, increasing the message count to four lines per failed connection. * p2p: document that RemovePeer blocks
673 lines
17 KiB
Go
673 lines
17 KiB
Go
// Copyright 2015 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package p2p
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import (
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"context"
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"errors"
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"fmt"
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"math/rand"
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"net"
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"reflect"
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"sync"
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"testing"
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"time"
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"github.com/ethereum/go-ethereum/common/mclock"
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"github.com/ethereum/go-ethereum/internal/testlog"
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"github.com/ethereum/go-ethereum/log"
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"github.com/ethereum/go-ethereum/p2p/enode"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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// This test checks that dynamic dials are launched from discovery results.
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func TestDialSchedDynDial(t *testing.T) {
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t.Parallel()
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config := dialConfig{
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maxActiveDials: 5,
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maxDialPeers: 4,
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}
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runDialTest(t, config, []dialTestRound{
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// 3 out of 4 peers are connected, leaving 2 dial slots.
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// 9 nodes are discovered, but only 2 are dialed.
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{
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peersAdded: []*conn{
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{flags: staticDialedConn, node: newNode(uintID(0x00), "")},
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{flags: dynDialedConn, node: newNode(uintID(0x01), "")},
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{flags: dynDialedConn, node: newNode(uintID(0x02), "")},
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},
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discovered: []*enode.Node{
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newNode(uintID(0x00), "127.0.0.1:30303"), // not dialed because already connected as static peer
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newNode(uintID(0x02), "127.0.0.1:30303"), // ...
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newNode(uintID(0x03), "127.0.0.1:30303"),
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newNode(uintID(0x04), "127.0.0.1:30303"),
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newNode(uintID(0x05), "127.0.0.1:30303"), // not dialed because there are only two slots
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newNode(uintID(0x06), "127.0.0.1:30303"), // ...
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newNode(uintID(0x07), "127.0.0.1:30303"), // ...
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newNode(uintID(0x08), "127.0.0.1:30303"), // ...
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x03), "127.0.0.1:30303"),
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newNode(uintID(0x04), "127.0.0.1:30303"),
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},
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},
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// One dial completes, freeing one dial slot.
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{
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failed: []enode.ID{
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uintID(0x04),
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x05), "127.0.0.1:30303"),
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},
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},
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// Dial to 0x03 completes, filling the last remaining peer slot.
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{
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succeeded: []enode.ID{
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uintID(0x03),
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},
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failed: []enode.ID{
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uintID(0x05),
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},
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discovered: []*enode.Node{
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newNode(uintID(0x09), "127.0.0.1:30303"), // not dialed because there are no free slots
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},
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},
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// 3 peers drop off, creating 6 dial slots. Check that 5 of those slots
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// (i.e. up to maxActiveDialTasks) are used.
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{
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peersRemoved: []enode.ID{
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uintID(0x00),
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uintID(0x01),
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uintID(0x02),
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},
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discovered: []*enode.Node{
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newNode(uintID(0x0a), "127.0.0.1:30303"),
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newNode(uintID(0x0b), "127.0.0.1:30303"),
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newNode(uintID(0x0c), "127.0.0.1:30303"),
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newNode(uintID(0x0d), "127.0.0.1:30303"),
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newNode(uintID(0x0f), "127.0.0.1:30303"),
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x06), "127.0.0.1:30303"),
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newNode(uintID(0x07), "127.0.0.1:30303"),
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newNode(uintID(0x08), "127.0.0.1:30303"),
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newNode(uintID(0x09), "127.0.0.1:30303"),
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newNode(uintID(0x0a), "127.0.0.1:30303"),
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},
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},
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})
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}
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// This test checks that candidates that do not match the netrestrict list are not dialed.
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func TestDialSchedNetRestrict(t *testing.T) {
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t.Parallel()
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nodes := []*enode.Node{
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newNode(uintID(0x01), "127.0.0.1:30303"),
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newNode(uintID(0x02), "127.0.0.2:30303"),
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newNode(uintID(0x03), "127.0.0.3:30303"),
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newNode(uintID(0x04), "127.0.0.4:30303"),
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newNode(uintID(0x05), "127.0.2.5:30303"),
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newNode(uintID(0x06), "127.0.2.6:30303"),
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newNode(uintID(0x07), "127.0.2.7:30303"),
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newNode(uintID(0x08), "127.0.2.8:30303"),
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}
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config := dialConfig{
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netRestrict: new(netutil.Netlist),
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maxActiveDials: 10,
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maxDialPeers: 10,
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}
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config.netRestrict.Add("127.0.2.0/24")
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runDialTest(t, config, []dialTestRound{
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{
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discovered: nodes,
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wantNewDials: nodes[4:8],
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},
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{
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succeeded: []enode.ID{
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nodes[4].ID(),
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nodes[5].ID(),
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nodes[6].ID(),
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nodes[7].ID(),
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},
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},
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})
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}
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// This test checks that static dials work and obey the limits.
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func TestDialSchedStaticDial(t *testing.T) {
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t.Parallel()
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config := dialConfig{
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maxActiveDials: 5,
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maxDialPeers: 4,
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}
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runDialTest(t, config, []dialTestRound{
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// Static dials are launched for the nodes that
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// aren't yet connected.
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{
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peersAdded: []*conn{
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{flags: dynDialedConn, node: newNode(uintID(0x01), "127.0.0.1:30303")},
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{flags: dynDialedConn, node: newNode(uintID(0x02), "127.0.0.2:30303")},
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},
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update: func(d *dialScheduler) {
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// These two are not dialed because they're already connected
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// as dynamic peers.
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d.addStatic(newNode(uintID(0x01), "127.0.0.1:30303"))
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d.addStatic(newNode(uintID(0x02), "127.0.0.2:30303"))
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// These nodes will be dialed:
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d.addStatic(newNode(uintID(0x03), "127.0.0.3:30303"))
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d.addStatic(newNode(uintID(0x04), "127.0.0.4:30303"))
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d.addStatic(newNode(uintID(0x05), "127.0.0.5:30303"))
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d.addStatic(newNode(uintID(0x06), "127.0.0.6:30303"))
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d.addStatic(newNode(uintID(0x07), "127.0.0.7:30303"))
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d.addStatic(newNode(uintID(0x08), "127.0.0.8:30303"))
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d.addStatic(newNode(uintID(0x09), "127.0.0.9:30303"))
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x03), "127.0.0.3:30303"),
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newNode(uintID(0x04), "127.0.0.4:30303"),
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newNode(uintID(0x05), "127.0.0.5:30303"),
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newNode(uintID(0x06), "127.0.0.6:30303"),
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},
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},
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// Dial to 0x03 completes, filling a peer slot. One slot remains,
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// two dials are launched to attempt to fill it.
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{
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succeeded: []enode.ID{
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uintID(0x03),
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},
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failed: []enode.ID{
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uintID(0x04),
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uintID(0x05),
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uintID(0x06),
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x04): nil,
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uintID(0x05): nil,
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uintID(0x06): nil,
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x08), "127.0.0.8:30303"),
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newNode(uintID(0x09), "127.0.0.9:30303"),
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},
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},
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// Peer 0x01 drops and 0x07 connects as inbound peer.
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// Only 0x01 is dialed.
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{
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peersAdded: []*conn{
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{flags: inboundConn, node: newNode(uintID(0x07), "127.0.0.7:30303")},
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},
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peersRemoved: []enode.ID{
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uintID(0x01),
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x01), "127.0.0.1:30303"),
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},
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},
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})
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}
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// This test checks that removing static nodes stops connecting to them.
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func TestDialSchedRemoveStatic(t *testing.T) {
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t.Parallel()
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config := dialConfig{
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maxActiveDials: 1,
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maxDialPeers: 1,
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}
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runDialTest(t, config, []dialTestRound{
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// Add static nodes.
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{
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update: func(d *dialScheduler) {
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d.addStatic(newNode(uintID(0x01), "127.0.0.1:30303"))
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d.addStatic(newNode(uintID(0x02), "127.0.0.2:30303"))
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d.addStatic(newNode(uintID(0x03), "127.0.0.3:30303"))
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x01), "127.0.0.1:30303"),
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},
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},
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// Dial to 0x01 fails.
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{
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failed: []enode.ID{
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uintID(0x01),
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x01): nil,
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x02), "127.0.0.2:30303"),
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},
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},
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// All static nodes are removed. 0x01 is in history, 0x02 is being
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// dialed, 0x03 is in staticPool.
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{
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update: func(d *dialScheduler) {
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d.removeStatic(newNode(uintID(0x01), "127.0.0.1:30303"))
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d.removeStatic(newNode(uintID(0x02), "127.0.0.2:30303"))
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d.removeStatic(newNode(uintID(0x03), "127.0.0.3:30303"))
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},
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failed: []enode.ID{
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uintID(0x02),
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x02): nil,
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},
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},
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// Since all static nodes are removed, they should not be dialed again.
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{}, {}, {},
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})
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}
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// This test checks that static dials are selected at random.
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func TestDialSchedManyStaticNodes(t *testing.T) {
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t.Parallel()
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config := dialConfig{maxDialPeers: 2}
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runDialTest(t, config, []dialTestRound{
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{
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peersAdded: []*conn{
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{flags: dynDialedConn, node: newNode(uintID(0xFFFE), "")},
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{flags: dynDialedConn, node: newNode(uintID(0xFFFF), "")},
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},
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update: func(d *dialScheduler) {
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for id := uint16(0); id < 2000; id++ {
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n := newNode(uintID(id), "127.0.0.1:30303")
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d.addStatic(n)
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}
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},
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},
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{
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peersRemoved: []enode.ID{
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uintID(0xFFFE),
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uintID(0xFFFF),
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x0085), "127.0.0.1:30303"),
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newNode(uintID(0x02dc), "127.0.0.1:30303"),
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newNode(uintID(0x0285), "127.0.0.1:30303"),
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newNode(uintID(0x00cb), "127.0.0.1:30303"),
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},
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},
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})
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}
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// This test checks that past dials are not retried for some time.
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func TestDialSchedHistory(t *testing.T) {
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t.Parallel()
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config := dialConfig{
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maxActiveDials: 3,
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maxDialPeers: 3,
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}
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runDialTest(t, config, []dialTestRound{
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{
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update: func(d *dialScheduler) {
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d.addStatic(newNode(uintID(0x01), "127.0.0.1:30303"))
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d.addStatic(newNode(uintID(0x02), "127.0.0.2:30303"))
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d.addStatic(newNode(uintID(0x03), "127.0.0.3:30303"))
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},
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wantNewDials: []*enode.Node{
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newNode(uintID(0x01), "127.0.0.1:30303"),
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newNode(uintID(0x02), "127.0.0.2:30303"),
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newNode(uintID(0x03), "127.0.0.3:30303"),
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},
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},
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// No new tasks are launched in this round because all static
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// nodes are either connected or still being dialed.
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{
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succeeded: []enode.ID{
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uintID(0x01),
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uintID(0x02),
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},
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failed: []enode.ID{
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uintID(0x03),
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x03): nil,
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},
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},
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// Nothing happens in this round because we're waiting for
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// node 0x3's history entry to expire.
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{},
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// The cache entry for node 0x03 has expired and is retried.
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{
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wantNewDials: []*enode.Node{
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newNode(uintID(0x03), "127.0.0.3:30303"),
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},
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},
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})
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}
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func TestDialSchedResolve(t *testing.T) {
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t.Parallel()
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config := dialConfig{
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maxActiveDials: 1,
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maxDialPeers: 1,
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}
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node := newNode(uintID(0x01), "")
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resolved := newNode(uintID(0x01), "127.0.0.1:30303")
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resolved2 := newNode(uintID(0x01), "127.0.0.55:30303")
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runDialTest(t, config, []dialTestRound{
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{
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update: func(d *dialScheduler) {
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d.addStatic(node)
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x01): resolved,
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},
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wantNewDials: []*enode.Node{
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resolved,
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},
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},
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{
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failed: []enode.ID{
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uintID(0x01),
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},
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wantResolves: map[enode.ID]*enode.Node{
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uintID(0x01): resolved2,
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},
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wantNewDials: []*enode.Node{
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resolved2,
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},
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},
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})
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}
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// -------
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// Code below here is the framework for the tests above.
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type dialTestRound struct {
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peersAdded []*conn
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peersRemoved []enode.ID
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update func(*dialScheduler) // called at beginning of round
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discovered []*enode.Node // newly discovered nodes
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succeeded []enode.ID // dials which succeed this round
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failed []enode.ID // dials which fail this round
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wantResolves map[enode.ID]*enode.Node
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wantNewDials []*enode.Node // dials that should be launched in this round
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}
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func runDialTest(t *testing.T, config dialConfig, rounds []dialTestRound) {
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var (
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clock = new(mclock.Simulated)
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iterator = newDialTestIterator()
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dialer = newDialTestDialer()
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resolver = new(dialTestResolver)
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peers = make(map[enode.ID]*conn)
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setupCh = make(chan *conn)
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)
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// Override config.
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config.clock = clock
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config.dialer = dialer
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config.resolver = resolver
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config.log = testlog.Logger(t, log.LvlTrace)
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config.rand = rand.New(rand.NewSource(0x1111))
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|
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// Set up the dialer. The setup function below runs on the dialTask
|
|
// goroutine and adds the peer.
|
|
var dialsched *dialScheduler
|
|
setup := func(fd net.Conn, f connFlag, node *enode.Node) error {
|
|
conn := &conn{flags: f, node: node}
|
|
dialsched.peerAdded(conn)
|
|
setupCh <- conn
|
|
return nil
|
|
}
|
|
dialsched = newDialScheduler(config, iterator, setup)
|
|
defer dialsched.stop()
|
|
|
|
for i, round := range rounds {
|
|
// Apply peer set updates.
|
|
for _, c := range round.peersAdded {
|
|
if peers[c.node.ID()] != nil {
|
|
t.Fatalf("round %d: peer %v already connected", i, c.node.ID())
|
|
}
|
|
dialsched.peerAdded(c)
|
|
peers[c.node.ID()] = c
|
|
}
|
|
for _, id := range round.peersRemoved {
|
|
c := peers[id]
|
|
if c == nil {
|
|
t.Fatalf("round %d: can't remove non-existent peer %v", i, id)
|
|
}
|
|
dialsched.peerRemoved(c)
|
|
}
|
|
|
|
// Init round.
|
|
t.Logf("round %d (%d peers)", i, len(peers))
|
|
resolver.setAnswers(round.wantResolves)
|
|
if round.update != nil {
|
|
round.update(dialsched)
|
|
}
|
|
iterator.addNodes(round.discovered)
|
|
|
|
// Unblock dialTask goroutines.
|
|
if err := dialer.completeDials(round.succeeded, nil); err != nil {
|
|
t.Fatalf("round %d: %v", i, err)
|
|
}
|
|
for range round.succeeded {
|
|
conn := <-setupCh
|
|
peers[conn.node.ID()] = conn
|
|
}
|
|
if err := dialer.completeDials(round.failed, errors.New("oops")); err != nil {
|
|
t.Fatalf("round %d: %v", i, err)
|
|
}
|
|
|
|
// Wait for new tasks.
|
|
if err := dialer.waitForDials(round.wantNewDials); err != nil {
|
|
t.Fatalf("round %d: %v", i, err)
|
|
}
|
|
if !resolver.checkCalls() {
|
|
t.Fatalf("unexpected calls to Resolve: %v", resolver.calls)
|
|
}
|
|
|
|
clock.Run(16 * time.Second)
|
|
}
|
|
}
|
|
|
|
// dialTestIterator is the input iterator for dialer tests. This works a bit like a channel
|
|
// with infinite buffer: nodes are added to the buffer with addNodes, which unblocks Next
|
|
// and returns them from the iterator.
|
|
type dialTestIterator struct {
|
|
cur *enode.Node
|
|
|
|
mu sync.Mutex
|
|
buf []*enode.Node
|
|
cond *sync.Cond
|
|
closed bool
|
|
}
|
|
|
|
func newDialTestIterator() *dialTestIterator {
|
|
it := &dialTestIterator{}
|
|
it.cond = sync.NewCond(&it.mu)
|
|
return it
|
|
}
|
|
|
|
// addNodes adds nodes to the iterator buffer and unblocks Next.
|
|
func (it *dialTestIterator) addNodes(nodes []*enode.Node) {
|
|
it.mu.Lock()
|
|
defer it.mu.Unlock()
|
|
|
|
it.buf = append(it.buf, nodes...)
|
|
it.cond.Signal()
|
|
}
|
|
|
|
// Node returns the current node.
|
|
func (it *dialTestIterator) Node() *enode.Node {
|
|
return it.cur
|
|
}
|
|
|
|
// Next moves to the next node.
|
|
func (it *dialTestIterator) Next() bool {
|
|
it.mu.Lock()
|
|
defer it.mu.Unlock()
|
|
|
|
it.cur = nil
|
|
for len(it.buf) == 0 && !it.closed {
|
|
it.cond.Wait()
|
|
}
|
|
if it.closed {
|
|
return false
|
|
}
|
|
it.cur = it.buf[0]
|
|
copy(it.buf[:], it.buf[1:])
|
|
it.buf = it.buf[:len(it.buf)-1]
|
|
return true
|
|
}
|
|
|
|
// Close ends the iterator, unblocking Next.
|
|
func (it *dialTestIterator) Close() {
|
|
it.mu.Lock()
|
|
defer it.mu.Unlock()
|
|
|
|
it.closed = true
|
|
it.buf = nil
|
|
it.cond.Signal()
|
|
}
|
|
|
|
// dialTestDialer is the NodeDialer used by runDialTest.
|
|
type dialTestDialer struct {
|
|
init chan *dialTestReq
|
|
blocked map[enode.ID]*dialTestReq
|
|
}
|
|
|
|
type dialTestReq struct {
|
|
n *enode.Node
|
|
unblock chan error
|
|
}
|
|
|
|
func newDialTestDialer() *dialTestDialer {
|
|
return &dialTestDialer{
|
|
init: make(chan *dialTestReq),
|
|
blocked: make(map[enode.ID]*dialTestReq),
|
|
}
|
|
}
|
|
|
|
// Dial implements NodeDialer.
|
|
func (d *dialTestDialer) Dial(ctx context.Context, n *enode.Node) (net.Conn, error) {
|
|
req := &dialTestReq{n: n, unblock: make(chan error, 1)}
|
|
select {
|
|
case d.init <- req:
|
|
select {
|
|
case err := <-req.unblock:
|
|
pipe, _ := net.Pipe()
|
|
return pipe, err
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
case <-ctx.Done():
|
|
return nil, ctx.Err()
|
|
}
|
|
}
|
|
|
|
// waitForDials waits for calls to Dial with the given nodes as argument.
|
|
// Those calls will be held blocking until completeDials is called with the same nodes.
|
|
func (d *dialTestDialer) waitForDials(nodes []*enode.Node) error {
|
|
waitset := make(map[enode.ID]*enode.Node)
|
|
for _, n := range nodes {
|
|
waitset[n.ID()] = n
|
|
}
|
|
timeout := time.NewTimer(1 * time.Second)
|
|
defer timeout.Stop()
|
|
|
|
for len(waitset) > 0 {
|
|
select {
|
|
case req := <-d.init:
|
|
want, ok := waitset[req.n.ID()]
|
|
if !ok {
|
|
return fmt.Errorf("attempt to dial unexpected node %v", req.n.ID())
|
|
}
|
|
if !reflect.DeepEqual(req.n, want) {
|
|
return fmt.Errorf("ENR of dialed node %v does not match test", req.n.ID())
|
|
}
|
|
delete(waitset, req.n.ID())
|
|
d.blocked[req.n.ID()] = req
|
|
case <-timeout.C:
|
|
var waitlist []enode.ID
|
|
for id := range waitset {
|
|
waitlist = append(waitlist, id)
|
|
}
|
|
return fmt.Errorf("timed out waiting for dials to %v", waitlist)
|
|
}
|
|
}
|
|
|
|
return d.checkUnexpectedDial()
|
|
}
|
|
|
|
func (d *dialTestDialer) checkUnexpectedDial() error {
|
|
select {
|
|
case req := <-d.init:
|
|
return fmt.Errorf("attempt to dial unexpected node %v", req.n.ID())
|
|
case <-time.After(150 * time.Millisecond):
|
|
return nil
|
|
}
|
|
}
|
|
|
|
// completeDials unblocks calls to Dial for the given nodes.
|
|
func (d *dialTestDialer) completeDials(ids []enode.ID, err error) error {
|
|
for _, id := range ids {
|
|
req := d.blocked[id]
|
|
if req == nil {
|
|
return fmt.Errorf("can't complete dial to %v", id)
|
|
}
|
|
req.unblock <- err
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// dialTestResolver tracks calls to resolve.
|
|
type dialTestResolver struct {
|
|
mu sync.Mutex
|
|
calls []enode.ID
|
|
answers map[enode.ID]*enode.Node
|
|
}
|
|
|
|
func (t *dialTestResolver) setAnswers(m map[enode.ID]*enode.Node) {
|
|
t.mu.Lock()
|
|
defer t.mu.Unlock()
|
|
|
|
t.answers = m
|
|
t.calls = nil
|
|
}
|
|
|
|
func (t *dialTestResolver) checkCalls() bool {
|
|
t.mu.Lock()
|
|
defer t.mu.Unlock()
|
|
|
|
for _, id := range t.calls {
|
|
if _, ok := t.answers[id]; !ok {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (t *dialTestResolver) Resolve(n *enode.Node) *enode.Node {
|
|
t.mu.Lock()
|
|
defer t.mu.Unlock()
|
|
|
|
t.calls = append(t.calls, n.ID())
|
|
return t.answers[n.ID()]
|
|
}
|