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x_redis.go
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x_redis.go
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package x
import (
"fmt"
"log"
"net/http"
"sort"
"time"
"github.com/go-redis/redis"
)
var (
RConn *redis.Client // global Redis connection
)
func RGetSingle(key string, field string) any {
value, err := RConn.HGet(key, field).Result()
if err != nil || value == "" {
// In this function we use 'nil' as false return value
// if something gone wrong
return nil
}
return value
}
func RSetSingle(key string, field string, value any, lastDay time.Duration) bool {
err := RConn.HSet(key, field, value).Err()
return err == nil
}
// Usually key := 'entityType:entityName'
func RSetExpire(key string, expire time.Duration) bool {
errExp := RConn.Expire(key, expire).Err()
return errExp == nil
}
// Usually key := 'entityType:entityName'
func RLockGetter(key string) *LockData {
c := new(LockData)
var resultsMap map[string]string
result, err := RConn.HMGet(key, "parent", "state", "user", "lastday").Result()
if err != nil || result[0] == nil { // no record found
c.HttpErr = http.StatusNoContent
return c
}
fields := []string{"parent", "state", "user", "lastday"}
resultsMap = make(map[string]string)
for i, field := range fields {
resultsMap[field] = result[i].(string)
}
c.Parent = resultsMap["parent"]
c.State = resultsMap["state"]
c.User = resultsMap["user"]
c.LastDay = resultsMap["lastday"]
c.HttpErr = http.StatusOK
return c
}
// Do not forget to fill x.LockData before function call!
//
// Returns `true` on successful run.
func RLockSetter(c *LockData) bool {
err := RConn.HMSet(c.Type+":"+c.Name, map[string]any{
"state": c.State,
"parent": c.Parent,
"user": c.User,
"lastday": c.LastDay,
}).Err()
return err == nil
}
func REntityDelete(enType string, enName string) bool {
err := RConn.HDel(enType, enName).Err()
if err != nil {
log.Fatal(err.Error())
}
// Check if entity has gone
if RGetSingle(enType, enName) == nil {
return true
} else {
return false
}
}
func RGetHostsInEnv(envName string) []string {
// Create a cursor to iterate over hash sets
var cursor uint64 = 0
var resultList []string
fmt.Printf("Checking hosts in '%s' environment...", envName)
for {
// Use SCAN command to get keys matching the pattern
keys, nextCursor, err := RConn.Scan(cursor, C_TYPE_HOST+":*", 0).Result()
if err != nil {
log.Fatal(err.Error())
}
// Loop through the keys and check if 'env' field contains envName
for _, key := range keys {
// Use HGET command to get the value of the 'env' field
parent, err := RConn.HGet(key, C_PARENT).Result()
if err != nil {
log.Fatal(err.Error())
}
if parent == envName {
resultList = append(resultList, key)
fmt.Printf("%s ", key)
}
}
fmt.Println()
// If nextCursor is 0, it means iteration is complete
if nextCursor == 0 {
break
}
// Update the cursor for the next iteration
cursor = nextCursor
}
return resultList
}
// matchPattern should be C_TYPE_ENV or C_TYPE_HOST
func RScanKeys(matchPattern string) []string {
var cursor uint64
keys := make([]string, 0)
for {
var (
result []string
err error
)
result, cursor, err = RConn.Scan(cursor, matchPattern+":*", 10).Result()
if err != nil {
log.Fatal(err.Error())
}
keys = append(keys, result...)
if cursor == 0 {
break
}
}
sort.Strings(keys)
return keys
}
func RFillJsonStats(r *Stats) {
envs := RScanKeys(C_TYPE_ENV)
envPrefixLen := len(C_TYPE_ENV) + 1
hostPrefixLen := len(C_TYPE_HOST) + 1
for _, key := range envs { // environment data
var envName string
var lockingUser string
var lastDay string
result, err := RConn.HGetAll(key).Result()
if err != nil {
fmt.Printf("Error fetching data for key %s: %s\n", key, err)
continue
}
for field, value := range result {
switch {
case field == "state" && value == C_STATE_VALID:
r.ValidEnvs = append(r.ValidEnvs, key[envPrefixLen:])
case field == "state" && value == C_STATE_LOCKED:
envName = key[envPrefixLen:]
if len(lockingUser) > 0 {
h := envName + " (👤" + lockingUser + " 📅" + lastDay + ")"
r.LockedEnvs = append(r.LockedEnvs, h)
}
case field == "state" && value == C_STATE_MAINTENANCE:
r.MaintEnvs = append(r.MaintEnvs, key[envPrefixLen:])
case field == "state" && value == C_STATE_TERMINATED:
r.TermdEnvs = append(r.TermdEnvs, key[envPrefixLen:])
case field == "user":
lockingUser = value
case field == "lastday":
lastDay = value
}
}
}
hosts := RScanKeys(C_TYPE_HOST)
for _, key := range hosts { // host data
var hostName string
var lockingUser string
var lastDay string
result, err := RConn.HGetAll(key).Result()
if err != nil {
fmt.Printf("Error fetching data for key %s: %s\n", key, err)
continue
}
for field, value := range result {
switch {
case field == "state" && value == C_STATE_LOCKED:
hostName = key[hostPrefixLen:]
case field == "user":
lockingUser = value
case field == "lastday":
lastDay = value
}
}
h := hostName + " (👤" + lockingUser + " 📅" + lastDay + ")"
r.LockedHosts = append(r.LockedHosts, h)
}
}