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package raft
import (
"io/ioutil"
"os"
"reflect"
"testing"
)
//------------------------------------------------------------------------------
//
// Tests
//
//------------------------------------------------------------------------------
//--------------------------------------
// Append
//--------------------------------------
// Ensure that we can append to a new log.
func TestLogNewLog(t *testing.T) {
path := getLogPath()
log := newLog()
log.ApplyFunc = func(e *LogEntry, c Command) (interface{}, error) {
return nil, nil
}
if err := log.open(path); err != nil {
t.Fatalf("Unable to open log: %v", err)
}
defer log.close()
defer os.Remove(path)
e, _ := newLogEntry(log, nil, 1, 1, &testCommand1{Val: "foo", I: 20})
if err := log.appendEntry(e); err != nil {
t.Fatalf("Unable to append: %v", err)
}
e, _ = newLogEntry(log, nil, 2, 1, &testCommand2{X: 100})
if err := log.appendEntry(e); err != nil {
t.Fatalf("Unable to append: %v", err)
}
e, _ = newLogEntry(log, nil, 3, 2, &testCommand1{Val: "bar", I: 0})
if err := log.appendEntry(e); err != nil {
t.Fatalf("Unable to append: %v", err)
}
// Partial commit.
if err := log.setCommitIndex(2); err != nil {
t.Fatalf("Unable to partially commit: %v", err)
}
if index, term := log.commitInfo(); index != 2 || term != 1 {
t.Fatalf("Invalid commit info [IDX=%v, TERM=%v]", index, term)
}
// Full commit.
if err := log.setCommitIndex(3); err != nil {
t.Fatalf("Unable to commit: %v", err)
}
if index, term := log.commitInfo(); index != 3 || term != 2 {
t.Fatalf("Invalid commit info [IDX=%v, TERM=%v]", index, term)
}
}
// Ensure that we can decode and encode to an existing log.
func TestLogExistingLog(t *testing.T) {
tmpLog := newLog()
e0, _ := newLogEntry(tmpLog, nil, 1, 1, &testCommand1{Val: "foo", I: 20})
e1, _ := newLogEntry(tmpLog, nil, 2, 1, &testCommand2{X: 100})
e2, _ := newLogEntry(tmpLog, nil, 3, 2, &testCommand1{Val: "bar", I: 0})
log, path := setupLog([]*LogEntry{e0, e1, e2})
defer log.close()
defer os.Remove(path)
// Validate existing log entries.
if len(log.entries) != 3 {
t.Fatalf("Expected 3 entries, got %d", len(log.entries))
}
if log.entries[0].Index() != 1 || log.entries[0].Term() != 1 {
t.Fatalf("Unexpected entry[0]: %v", log.entries[0])
}
if log.entries[1].Index() != 2 || log.entries[1].Term() != 1 {
t.Fatalf("Unexpected entry[1]: %v", log.entries[1])
}
if log.entries[2].Index() != 3 || log.entries[2].Term() != 2 {
t.Fatalf("Unexpected entry[2]: %v", log.entries[2])
}
}
// Ensure that we can check the contents of the log by index/term.
func TestLogContainsEntries(t *testing.T) {
tmpLog := newLog()
e0, _ := newLogEntry(tmpLog, nil, 1, 1, &testCommand1{Val: "foo", I: 20})
e1, _ := newLogEntry(tmpLog, nil, 2, 1, &testCommand2{X: 100})
e2, _ := newLogEntry(tmpLog, nil, 3, 2, &testCommand1{Val: "bar", I: 0})
log, path := setupLog([]*LogEntry{e0, e1, e2})
defer log.close()
defer os.Remove(path)
if log.containsEntry(0, 0) {
t.Fatalf("Zero-index entry should not exist in log.")
}
if log.containsEntry(1, 0) {
t.Fatalf("Entry with mismatched term should not exist")
}
if log.containsEntry(4, 0) {
t.Fatalf("Out-of-range entry should not exist")
}
if !log.containsEntry(2, 1) {
t.Fatalf("Entry 2/1 should exist")
}
if !log.containsEntry(3, 2) {
t.Fatalf("Entry 2/1 should exist")
}
}
// Ensure that we can recover from an incomplete/corrupt log and continue logging.
func TestLogRecovery(t *testing.T) {
tmpLog := newLog()
e0, _ := newLogEntry(tmpLog, nil, 1, 1, &testCommand1{Val: "foo", I: 20})
e1, _ := newLogEntry(tmpLog, nil, 2, 1, &testCommand2{X: 100})
f, _ := ioutil.TempFile("", "raft-log-")
e0.Encode(f)
e1.Encode(f)
f.WriteString("CORRUPT!")
f.Close()
log := newLog()
log.ApplyFunc = func(e *LogEntry, c Command) (interface{}, error) {
return nil, nil
}
if err := log.open(f.Name()); err != nil {
t.Fatalf("Unable to open log: %v", err)
}
defer log.close()
defer os.Remove(f.Name())
e, _ := newLogEntry(log, nil, 3, 2, &testCommand1{Val: "bat", I: -5})
if err := log.appendEntry(e); err != nil {
t.Fatalf("Unable to append: %v", err)
}
// Validate existing log entries.
if len(log.entries) != 3 {
t.Fatalf("Expected 3 entries, got %d", len(log.entries))
}
if log.entries[0].Index() != 1 || log.entries[0].Term() != 1 {
t.Fatalf("Unexpected entry[0]: %v", log.entries[0])
}
if log.entries[1].Index() != 2 || log.entries[1].Term() != 1 {
t.Fatalf("Unexpected entry[1]: %v", log.entries[1])
}
if log.entries[2].Index() != 3 || log.entries[2].Term() != 2 {
t.Fatalf("Unexpected entry[2]: %v", log.entries[2])
}
}
//--------------------------------------
// Append
//--------------------------------------
// Ensure that we can truncate uncommitted entries in the log.
func TestLogTruncate(t *testing.T) {
log, path := setupLog(nil)
if err := log.open(path); err != nil {
t.Fatalf("Unable to open log: %v", err)
}
defer os.Remove(path)
entry1, _ := newLogEntry(log, nil, 1, 1, &testCommand1{Val: "foo", I: 20})
if err := log.appendEntry(entry1); err != nil {
t.Fatalf("Unable to append: %v", err)
}
entry2, _ := newLogEntry(log, nil, 2, 1, &testCommand2{X: 100})
if err := log.appendEntry(entry2); err != nil {
t.Fatalf("Unable to append: %v", err)
}
entry3, _ := newLogEntry(log, nil, 3, 2, &testCommand1{Val: "bar", I: 0})
if err := log.appendEntry(entry3); err != nil {
t.Fatalf("Unable to append: %v", err)
}
if err := log.setCommitIndex(2); err != nil {
t.Fatalf("Unable to partially commit: %v", err)
}
// Truncate committed entry.
if err := log.truncate(1, 1); err == nil || err.Error() != "raft.Log: Index is already committed (2): (IDX=1, TERM=1)" {
t.Fatalf("Truncating committed entries shouldn't work: %v", err)
}
// Truncate past end of log.
if err := log.truncate(4, 2); err == nil || err.Error() != "raft.Log: Entry index does not exist (MAX=3): (IDX=4, TERM=2)" {
t.Fatalf("Truncating past end-of-log shouldn't work: %v", err)
}
// Truncate entry with mismatched term.
if err := log.truncate(2, 2); err == nil || err.Error() != "raft.Log: Entry at index does not have matching term (1): (IDX=2, TERM=2)" {
t.Fatalf("Truncating mismatched entries shouldn't work: %v", err)
}
// Truncate end of log.
if err := log.truncate(3, 2); !(err == nil && reflect.DeepEqual(log.entries, []*LogEntry{entry1, entry2, entry3})) {
t.Fatalf("Truncating end of log should work: %v\n\nEntries:\nActual: %v\nExpected: %v", err, log.entries, []*LogEntry{entry1, entry2, entry3})
}
// Truncate at last commit.
if err := log.truncate(2, 1); !(err == nil && reflect.DeepEqual(log.entries, []*LogEntry{entry1, entry2})) {
t.Fatalf("Truncating at last commit should work: %v\n\nEntries:\nActual: %v\nExpected: %v", err, log.entries, []*LogEntry{entry1, entry2})
}
// Append after truncate
if err := log.appendEntry(entry3); err != nil {
t.Fatalf("Unable to append after truncate: %v", err)
}
log.close()
// Recovery the truncated log
log = newLog()
if err := log.open(path); err != nil {
t.Fatalf("Unable to open log: %v", err)
}
// Validate existing log entries.
if len(log.entries) != 3 {
t.Fatalf("Expected 3 entries, got %d", len(log.entries))
}
if log.entries[0].Index() != 1 || log.entries[0].Term() != 1 {
t.Fatalf("Unexpected entry[0]: %v", log.entries[0])
}
if log.entries[1].Index() != 2 || log.entries[1].Term() != 1 {
t.Fatalf("Unexpected entry[1]: %v", log.entries[1])
}
if log.entries[2].Index() != 3 || log.entries[2].Term() != 2 {
t.Fatalf("Unexpected entry[2]: %v", log.entries[2])
}
}
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