Java 使用正则表达式从Grafana表达式检索普罗米修斯度量名称
我尝试了许多不同的Java 使用正则表达式从Grafana表达式检索普罗米修斯度量名称,java,regex,grafana,prometheus,regex-group,Java,Regex,Grafana,Prometheus,Regex Group,我尝试了许多不同的regex模式来获得它,但并不十分成功 这个问题的模式是: <method_name(> metric_name <{filter_condition}> <[time_duration]> <)> <by (some members)> ^------------------------------------------------------^
regex
模式来获得它,但并不十分成功
这个问题的模式是:
<method_name(> metric_name <{filter_condition}> <[time_duration]> <)> <by (some members)>
^------------------------------------------------------^
method_name(...) can be multiple
下面是我在Java中尝试的一个演示。但是我似乎无法获得正确的模式
来检索我上面提到的模式的确切答案
如果可能的话,请分享一些想法
public static void main(String... args) {
String[] exprs = {"sum(log_query_task_cache_hit_rate_bucket)by(le)",
"sum(log_search_by_service_total {service_name!~\"\"}) by (service_name, operator)",
"log_request_total",
" sum(delta(log_request_total[5m])) by (args, user_id)",
"log_request_total{methodName=~\"getAppDynamicsGraphMetrics|getAppDynamicsMetrics\"}",
"sum(delta(log_request_total{className=~\".*ProductDashboardController\",methodName=~\"getDashboardConfig|updateMaintainers|addQuickLink|deleteQuickLink|addDependentMiddleware|addDependentService|updateErrorThreshold\"}[5m])) by (user_id)",
"sum(log_request_total{methodName=\"getInstanceNames\"}) by (user_id)",
"sum(log_request_total{methodName=\"getVpcCardInfo\",user_id!~\"${user}\"}) by (envName)",
"count_scalar(sum(log_query_request_total) by (user_id))",
"avg(log_waiting_time_average) by (exported_tenant, exported_landscape)",
"avg(task_processing_time_average{app=\"athena\"})",
"avg(log_queue_time_average) by (log_type)",
"sum(delta(product_dashboard_service_sum[2m]))",
"ceil(delta(product_dashboard_service_count[5m]))]"
};
String[] expected = {
"log_query_task_cache_hit_rate_bucket",
"log_search_by_service_total",
"log_request_total",
"log_request_total",
"log_request_total",
"log_request_total",
"log_request_total",
"log_request_total",
"log_query_request_total",
"log_waiting_time_average",
"task_processing_time_average",
"log_queue_time_average",
"product_dashboard_service_sum",
"product_dashboard_service_count"
};
Pattern pattern = Pattern.compile(".*?\\(?([\\w|_]+)\\{?\\[?.*");
testPattern(exprs, expected, pattern);
pattern = Pattern.compile(".*\\(?([\\w|_]+)\\{?\\[?.*");
testPattern(exprs, expected, pattern);
pattern = Pattern.compile(".*?\\(?([\\w|_]+)\\{?\\[?.*");
testPattern(exprs, expected, pattern);
}
private static void testPattern(String[] exprs, String[] expected, Pattern pattern) {
System.out.println("\n********** Pattern Match Test *********\n");
for (int i = 0; i < exprs.length; ++i) {
String expr = exprs[i];
Matcher matcher = pattern.matcher(expr);
if (matcher.find()) {
System.out.println("\nThe Original Expr: " + expr);
System.out.println(String.format("Expected:\t %-40s Matched:\t %-40s", expected[i], matcher.group(1)));
} else {
System.out.println("expected: " + expected[i] + " not matched");
}
}
}
但以下一种甚至更复杂的组合让我转向可靠的方法:
Case # 8
input: sum(hue_mail_sent_attachment_bytes_total) by (app) / sum(hue_mail_sent_mails_with_attachment_total) by (app)
Expected: [hue_mail_sent_attachment_bytes_total, hue_mail_sent_mails_with_attachment_total]
现在要复杂得多…甚至是不可预测的,因为无法控制用户输入的expr
因此,我通过更可靠、更简单的解决方案实现了相同的目标:
不同的度量名称存储到数据库中李>
当expr
出现时,使用contains(字符串s)
在内存中检查它李>
但也可能存在一个问题:如果某些度量名称包含其他度量名称,则过度匹配李>
此正则表达式捕获组1中的目标
^(?:\w+\()*(\w+)
看
在java中,要获得目标:
String metricName = input.replaceAll("^(?:\\w+\\()*(\\w+)", "$1");
此正则表达式捕获组1中的目标
^(?:\w+\()*(\w+)
看
在java中,要获得目标:
String metricName = input.replaceAll("^(?:\\w+\\()*(\\w+)", "$1");
这对于正则表达式来说太复杂了。对于这样复杂的东西,你可能需要一个lexer和一个AST生成器。这对于RegEx来说太复杂了。对于这样复杂的东西,你可能需要一个lexer和一个AST生成器。哇,非常感谢你,@Bohemian。它是如此简洁和干净<代码>^(?:\w+\()*
将匹配所有的方法名称(
重复,并且在重复之后(零或更多)它就在那里=>我正在搜索的度量名称。
很好的解决方案;)但我仍然需要对额外的空格进行一些小的修改,以确保它始终有效。感谢您的帮助~@Bohemian^(不过,我需要对额外的空格进行一些小的修改,以确保它始终有效。感谢您的帮助~@Bohemian.^(?:\\s*\\w+\\s*\(\\s*)*\\s*(\w+)