95 lines
2.5 KiB
Go
95 lines
2.5 KiB
Go
// Copyright 2019 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package rafttest
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import (
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"bufio"
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"fmt"
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"strings"
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"testing"
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"github.com/cockroachdb/datadriven"
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"go.etcd.io/etcd/v3/raft/raftpb"
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)
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func (env *InteractionEnv) handleStabilize(t *testing.T, d datadriven.TestData) error {
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var idxs []int
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for _, id := range ints(t, d) {
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idxs = append(idxs, id-1)
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}
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return env.Stabilize(idxs...)
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}
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// Stabilize repeatedly runs Ready handling on and message delivery to the set
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// of nodes specified via the idxs slice until reaching a fixed point.
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func (env *InteractionEnv) Stabilize(idxs ...int) error {
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var nodes []Node
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for _, idx := range idxs {
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nodes = append(nodes, env.Nodes[idx])
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}
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if len(nodes) == 0 {
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nodes = env.Nodes
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}
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withIndent := func(f func()) {
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orig := env.Output.Builder
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env.Output.Builder = &strings.Builder{}
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f()
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scanner := bufio.NewScanner(strings.NewReader(env.Output.Builder.String()))
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for scanner.Scan() {
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orig.WriteString(" " + scanner.Text() + "\n")
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}
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env.Output.Builder = orig
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}
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for {
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done := true
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for _, rn := range nodes {
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if rn.HasReady() {
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done = false
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idx := int(rn.Status().ID - 1)
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fmt.Fprintf(env.Output, "> %d handling Ready\n", idx+1)
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withIndent(func() { env.ProcessReady(idx) })
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}
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}
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for _, rn := range nodes {
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id := rn.Status().ID
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// NB: we grab the messages just to see whether to print the header.
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// DeliverMsgs will do it again.
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if msgs, _ := splitMsgs(env.Messages, id); len(msgs) > 0 {
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fmt.Fprintf(env.Output, "> %d receiving messages\n", id)
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withIndent(func() { env.DeliverMsgs(Recipient{ID: id}) })
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done = false
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}
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}
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if done {
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return nil
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}
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}
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}
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func splitMsgs(msgs []raftpb.Message, to uint64) (toMsgs []raftpb.Message, rmdr []raftpb.Message) {
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// NB: this method does not reorder messages.
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for _, msg := range msgs {
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if msg.To == to {
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toMsgs = append(toMsgs, msg)
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} else {
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rmdr = append(rmdr, msg)
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}
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}
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return toMsgs, rmdr
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}
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