事件:原本lua腳本讀的還好好的,下午改了讀取方式後就報錯:
Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException:
ERR Error compiling script (new function): user_script:1: 'end' expected near '<eof>'
解決過程:反覆試了好幾次,用測試類測試本地redis的服務是否正常後,發現redis服務是好的
根據報的錯,可以看出是lua腳本出的問題,於是把讀取到的lua腳本打印出來後發現:
[2020-04-08 21:27:35,788]-[INFO]-[main]-[com.util.ReadConfigsPathUtil:57]-luaScript:local function get_next_seq() local key = tostring(KEYS[1]) local incr_amoutt = tonumber(KEYS[2]) local seq = tonumber(KEYS[3]) local month_in_seconds = 24 * 60 * 60 * 30 if (1 == redis.call(‘setnx’, key, seq)) then redis.call(‘expire’, key, month_in_seconds) return seq else local nextSeq = redis.call(‘incrby’, key, incr_amoutt) return nextSeq endendreturn get_next_seq()
解決方法:可以發現最後一行出現了”endendreturn “相連,所以自然是錯誤的,於是修改後:在每讀一行之後都回車換行,完美解決問題!!!
類似問題:出現問題之後我去查了同僚們也有類似的問題,他們是出在配置文件配置redis時,超時時間寫的是0,可以改成1000或更多毫秒
spring.redis.pool.timeout= 2000ms
另外還有是由於腳本中有中文的問題,刪掉後就好了!!!
還有:在項目中配置文件中,連接redis,配置了密碼,密碼錯誤,或者配置文件中沒有寫密碼,就會報錯,可以考慮取消密碼或者修改配置文件,添加密碼。
在springboot項目中原本用的ClassPathResource 讀取的配置文件,但是考慮到在生產環境時配置文件或者腳本文件需要單獨拿出來,但是放在resouce目錄下打包的時候就會打進去,無法解耦,所以在根目錄下建了config目錄,把腳本放在跟目錄下:
讀取lua腳本的方法:
package com.test.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.UrlResource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.script.DefaultRedisScript;
import org.springframework.data.redis.core.script.DefaultScriptExecutor;
import org.springframework.data.redis.core.script.RedisScript;
import org.springframework.stereotype.Component;
import org.springframework.util.FileCopyUtils;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.List;
@Component
public class RedisUtil {
private static final Logger log = LoggerFactory.getLogger(RedisUtil.class);
private static StringRedisTemplate redisStringTemplate;
private static RedisScript<Long> redisScript;
private static DefaultScriptExecutor<String> scriptExecutor;
private RedisUtil(StringRedisTemplate template) throws IOException {
RedisUtil.redisStringTemplate = template;
// 初始化lua腳本調用 的redisScript 和 scriptExecutor
//第一種辦法:通過ClassPathResource讀取resource下的lua腳本
// ClassPathResource luaResource = new ClassPathResource("luaScript/genSeq.lua");
// EncodedResource encRes = new EncodedResource(luaResource, "UTF-8");
// String luaString = FileCopyUtils.copyToString(encRes.getReader());
//第二種辦法,讀取跟目錄下的config目錄後再按行讀取
String luaString= ReadConfigsPathUtil.readFileContent("luaScript/genSeq.lua");
// log.info("luaString:"+luaString);
redisScript = new DefaultRedisScript<>(luaString, Long.class);
scriptExecutor = new DefaultScriptExecutor<>(redisStringTemplate);
}
public static Long getBusiSeq(List<String> Busilist) {
Long seqFromRedis = scriptExecutor.execute(redisScript, Busilist);
return seqFromRedis;
}
}
方法:ReadConfigsPathUtil.readFileContent(“luaScript/genSeq.lua”)
package com.test.util;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Properties;
public class ReadConfigsPathUtil {
private static final Logger log = LoggerFactory.getLogger(ReadConfigsPathUtil.class);
private ReadConfigsPathUtil() {}
private static Properties properties = null;
public static String getPropertiesPath(String luaScriptPath) {
String sysPath=getrelativePath();
String osType=System.getProperties().getProperty("os.name").toLowerCase();
log.info("sysPath:"+sysPath);
String filepath="";
if(osType.startsWith("windows")) {
filepath=new StringBuffer(sysPath).append(File.separator)
.append("config").append(File.separator).append(luaScriptPath).toString();
log.info("filepath:"+filepath);
}else if(osType.startsWith("linux")) {//啓動腳本在哪個路徑,sysPath的值就是當前路徑的pwd的值
int len=sysPath.length();
int lenBin=("/bin").length();//我的啓動腳本在bin目錄下
sysPath=sysPath.substring(0,(len-lenBin));
filepath=new StringBuffer(sysPath).append(File.separator)
.append("config").append(File.separator).append(luaScriptPath).toString();
log.info("filepath:"+filepath);
}
return filepath;
}
public static String getrelativePath() {
return System.getProperty("user.dir");
}
public static String readFileContent(String luaScriptPath) {
String filename=getPropertiesPath(luaScriptPath);
File file = new File(filename);
BufferedReader reader = null;
StringBuffer sbf = new StringBuffer();
try {
reader = new BufferedReader(new FileReader(file));
String tempStr;
while ((tempStr = reader.readLine()) != null) {
sbf.append(tempStr);
sbf.append("\r\n");//此處必須換行,這是出現RedisCommandExecutionException異常的原因
}
reader.close();
return sbf.toString();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e1) {
e1.printStackTrace();
}
}
}
return sbf.toString();
}
}
與君共勉!!!也歡迎留言交流哦~~~