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logman.go
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logman.go
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package main
import (
"context"
"fmt"
"github.com/redis/go-redis/v9"
"log"
"sync"
)
const LogKey = "log"
var wg = sync.WaitGroup{}
type Logman struct {
redisAddress string
redisPassword string
redisDB int
redisClient *redis.Client
}
func NewLogman(redisAddress, redisPassword string, redisDB int) *Logman {
return &Logman{
redisAddress: redisAddress,
redisPassword: redisPassword,
redisDB: redisDB,
redisClient: redis.NewClient(&redis.Options{
Addr: redisAddress,
Password: redisPassword,
DB: redisDB,
}),
}
}
func (l *Logman) checkRedisClient() {
_, err := l.redisClient.Ping(context.Background()).Result()
if err != nil {
l.redisClient = redis.NewClient(&redis.Options{
Addr: l.redisAddress,
Password: l.redisPassword,
DB: l.redisDB,
})
}
}
func (l *Logman) getContext(c ...context.Context) context.Context {
if len(c) == 0 {
return context.Background()
}
return c[0]
}
func (l *Logman) fetchLastLogId(c ...context.Context) int {
l.checkRedisClient()
ctx := l.getContext(c...)
result, err := l.redisClient.LRange(ctx, LogKey, -1, -1).Result()
if err != nil {
log.Fatal("An error occurred in fetchLastLogId() method while getting last log: ", err)
}
if len(result) == 0 {
return -1
}
lastEncodedLog := result[0]
lastLog := DecodeLog(lastEncodedLog)
return lastLog.id
}
func (l *Logman) fetchLastLogCommitIndex(c ...context.Context) int {
l.checkRedisClient()
ctx := l.getContext(c...)
result, err := l.redisClient.LRange(ctx, LogKey, -1, -1).Result()
if err != nil {
log.Fatal("An error occurred in fetchLastLogCommitIndex() method while getting last log: ", err)
}
if len(result) == 0 {
return -1
}
lastEncodedLog := result[0]
lastLog := DecodeLog(lastEncodedLog)
return lastLog.commitIndex
}
func (l *Logman) Push(log *Log, c ...context.Context) {
l.checkRedisClient()
ctx := l.getContext(c...)
wg.Wait()
log.id = l.fetchLastLogId(c...) + 1
log.commitIndex = l.fetchLastLogCommitIndex(c...)
l.redisClient.RPush(ctx, LogKey, log.Encode())
}
func (l *Logman) hardPush(log *Log, c ...context.Context) {
l.checkRedisClient()
ctx := l.getContext(c...)
log.id = l.fetchLastLogId(c...) + 1
l.redisClient.RPush(ctx, LogKey, log.Encode())
}
func (l *Logman) RetrieveLastLog(c ...context.Context) *Log {
l.checkRedisClient()
ctx := l.getContext(c...)
result, err := l.redisClient.LRange(ctx, LogKey, -1, -1).Result()
if err != nil {
log.Fatal("An error occurred in RetrieveLastLog() method while getting last log: ", err)
}
lastEncodedLog := result[0]
lastLog := DecodeLog(lastEncodedLog)
return lastLog
}
func (l *Logman) RetrieveLogs(start, end int64, c ...context.Context) []Log {
// TODO: Return all if something is persisted on dist
l.checkRedisClient()
ctx := l.getContext(c...)
result, err := l.redisClient.LRange(ctx, LogKey, start, end).Result()
if err != nil {
log.Fatal("An error occurred in RetrieveLogs() method while getting logs: ", err)
}
logs := make([]Log, len(result))
for i, encodedLog := range result {
decodedLog := DecodeLog(encodedLog)
logs[i] = *decodedLog
}
return logs
}
func (l *Logman) RetrieveAllLogs(c ...context.Context) []Log {
return l.RetrieveLogs(0, -1, c...)
}
func (l *Logman) RetrieveUncommittedLogs(c ...context.Context) []Log {
return l.RetrieveLogs(int64(l.fetchLastLogCommitIndex(c...))+1, int64(-1), c...)
}
func (l *Logman) trim(start, end int64, c ...context.Context) {
l.checkRedisClient()
ctx := l.getContext(c...)
_, err := l.redisClient.LTrim(ctx, LogKey, start, end).Result()
if err != nil {
log.Fatal("An error occurred in Trim() method while trimming: ", err)
}
}
func (l *Logman) TrimCommittedLogs(c ...context.Context) {
lastCommittedIndex := int64(l.fetchLastLogCommitIndex(c...))
if lastCommittedIndex == -1 {
l.flushMemory(c...)
return
}
l.trim(0, lastCommittedIndex)
}
func (l *Logman) flushMemory(c ...context.Context) {
l.checkRedisClient()
ctx := l.getContext(c...)
l.redisClient.Del(ctx, LogKey)
}
func (l *Logman) Commit(c ...context.Context) {
l.checkRedisClient()
ctx := l.getContext(c...)
defer wg.Done()
wg.Add(1)
uncommittedLogs := l.RetrieveUncommittedLogs(ctx)
l.TrimCommittedLogs(ctx)
newCommitIndex := uncommittedLogs[len(uncommittedLogs)-1].id
for _, lg := range uncommittedLogs {
lg.commitIndex = newCommitIndex
lg.command.Execute()
l.hardPush(&lg, ctx)
}
}
func main() {
lgman := NewLogman("127.0.0.1:6379", "", 0)
ctx := context.Background()
lgman.flushMemory(ctx)
log1 := NewLog(10, 1, NewCommand(ShellClass, "ls"), 0)
lgman.Push(log1)
//fmt.Println(lgman.RetrieveLastLog().ToString())
log2 := NewLog(10, 1, NewCommand(ShellClass, "uname -a"), 0)
lgman.Push(log2)
//fmt.Println(lgman.RetrieveLastLog().ToString())
log3 := NewLog(10, 2, NewCommand(ShellClass, "dig A +short google.com"), 0)
lgman.Push(log3)
logs := lgman.RetrieveAllLogs(ctx)
for _, lg := range logs {
fmt.Println(lg.ToString())
}
lgman.Commit()
logs = lgman.RetrieveAllLogs(ctx)
for _, lg := range logs {
fmt.Println(lg.ToString())
}
// TODO: Make a timeout code
log4 := NewLog(10, 2, NewCommand(ShellClass, "echo Hey"), 0)
lgman.Push(log4)
log5 := NewLog(10, 2, NewCommand(ShellClass, "whoami"), 0)
lgman.Push(log5)
logs = lgman.RetrieveAllLogs(ctx)
for _, lg := range logs {
fmt.Println(lg.ToString())
}
lgman.Commit()
logs = lgman.RetrieveAllLogs(ctx)
for _, lg := range logs {
fmt.Println(lg.ToString())
}
}