上下文:
这是一个日志分析的东西。我正在创建一个 regex
程序来查找从客户端发送到服务器的某些请求的出现。我有包含这些请求以及其他日志的客户端日志文件。
问题: 当请求消息发送到服务器时,客户端应该有 2 个日志语句,如:
sending..
message_type
当找到上述语句或模式时,我们可以说一个请求已经发送。它是组合模式。好的
我们期望日志文件内容是这样的
sending..
message_type
...//other text
sending..
message_type
...//other text
sending..
message_type
从上面的日志我们可以看出客户端已经发送了 3 条消息。但是在实际的日志文件中,不知何故,模式重叠如下(不是针对所有消息,而是针对某些消息):
sending..(1)
...//other text
sending..(2)
message_type(2)
...//other text
message_type(1)
sending..(3)
message_type(3)
还有 3 个请求(我对消息进行了编号以便理解)。但是模式是重叠的。即在完全记录第一条消息之前,第二条消息被记录了。 以上解释是为了理解。以下为部分日志原件:
原始日志
Send message to server:
Created post notification log dir
Created post notification log dir
Created post notification log dir
Send message to server:
Created post notification log dir
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
INFO [a] - Server Response: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><response xaction_guid="new xaction guid" type="ok"></params></response></message>
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
INFO [a] - Server Response: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><response xaction_guid="new xaction guid" type="ok"></response></message>
这里根据解释单个请求将被识别为它的 2 个部分:
Send message to server:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
我尝试过的
public class LogMatcher {
static final String create_session= "Send message to server(.){10,1000}(<\\?xml(.){10,500}type=\"createsession\"(.){1,100}</message>)";
public static void main(String[] args) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(new File("D:/dummy.txt"))));//I put the above log in this file
StringBuilder b = new StringBuilder();
String line = "";
while((line = reader.readLine()) != null ){
b.append(line);
}
findMatch(b,"Send message to server","Send message to server");
findMatch(b,create_session,"create_session");
}
private static int findMatch(StringBuilder b,String pattern, String type) {
int count =0;
Pattern regex = Pattern.compile(pattern,Pattern.MULTILINE);
Matcher regexMatcher = regex.matcher(b.toString());
while (regexMatcher.find()) {
count++;
}
System.out.printf("%25s%2d\n",type+": ",count);
return count;
}
}
当前输出
意图是找出发送的createsession
消息的数量
Send message to server: 2
create_session: 1
预期输出
从日志中可以清楚地看到发送了 2 条消息。因此输出将是:
Send message to server: 2
create_session: 2
您可以看到我在代码中尝试过的模式。任何人都可以建议一种模式以获得所需的结果吗?
注意:可以简单地说为什么不单独使用 Send message to server
计数。因为在日志中有许多类型的消息,如 login、closesession
等。它们的第一部分都是 Send message to server
。它们也单独记录了消息类型出于其他目的,所以我们不能中继任何部分(意味着只能中继我们可以中继的组合)
最佳答案
Find occurrence of certain requests send to a server from a client.
"other way" that you can neglect here , that will have like
Store in DB :
instead ofSend message to server
and the xml message.
我会提出一个新策略:
- 仅使用 1 个正则表达式来匹配所有备选方案,仅解析一次日志(提高长文件的性能)。
- 匹配
type=\"createsession\"
独立的 xml。 - 也匹配
Store in DB:
xml,但忽略它们(不要增加计数器)。
我们可以使用下面的表达式来匹配发送到服务器的消息数。
^(?<toserver>Send message to server:)
- 注意我使用的是 named group ,我们稍后可以引用为
regexMatcher.group("toserver")
增加计数器。
并独立匹配目标 xmls 为:
^(?<message><\? *xml\b.{10,500} type *= *\"createsession\")
- 后来引用为
regexMatcher.group("message")
. - 我们将使用独立的柜台。
那么,我们如何忽略 Store in DB:
xml?我们可以匹配它们,同时不创建捕获。
^Store in DB ?:\r?\n(?:.*\n)*?<\? *xml\b.*
- 它匹配文字
Store in DB :
, 其次是 -
\r?\n(?:.*\n)*?
尽可能少的行,直到 -
<\? *xml\b.*
它与拳头相配<?xml
行
正则表达式
^(?:Store in DB ?:\r?\n(?:.*\n)*?<\? *xml\b.*|(?<toserver>Send message to server:)|(?<message><\? *xml\b.{10,500} type *= *\"createsession\"))
代码
static final String create_session = "^(?:Store in DB ?:\\r?\\n(?:.*\\n)*?<\\? *xml\\b.*|(?<toserver>Send message to server:)|(?<message><\\? *xml\\b.{10,500} type *= *\\\"createsession\\\"))";
public static void main (String[] args) throws java.lang.Exception
{
//for testing purposes
final String text = "Send message to server:\nCreated post notification log dir\nCreated post notification log dir\nCreated post notification log dir\nSend message to server:\nCreated post notification log dir\n<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><message schema_version=\"3644767c-2632-411a-9416-44f8a7dee08e\"><request xaction_guid=\"new xaction guid\" type=\"createsession\"/></message>\nStore in DB :\n<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><message schema_version=\"3644767c-2632-411a-9416-44f8a7dee08e\"><request xaction_guid=\"new xaction guid\" type=\"createsession\"/></message>\nINFO [a] - Server Response: <?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><message schema_version=\"3644767c-2632-411a-9416-44f8a7dee08e\"><response xaction_guid=\"new xaction guid\" type=\"ok\"></params></response></message>\n<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><message schema_version=\"3644767c-2632-411a-9416-44f8a7dee08e\"><request xaction_guid=\"new xaction guid\" type=\"createsession\"/></message>\nINFO [a] - Server Response: <?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?><message schema_version=\"3644767c-2632-411a-9416-44f8a7dee08e\"><response xaction_guid=\"new xaction guid\" type=\"ok\"></response></message>";
System.out.println("INPUT:\n" + text + "\n\nCOUNT:");
StringBuilder b = new StringBuilder();
b.append(text);
findMatch(b,create_session,"create_session");
}
private static int findMatch(StringBuilder b,String pattern, String type) {
int count =0; // counter for "Send message to server:"
int countType=0; // counter for "type=\"createsession\""
Pattern regex = Pattern.compile(pattern,Pattern.MULTILINE);
Matcher regexMatcher = regex.matcher(b.toString());
while (regexMatcher.find()) {
if (regexMatcher.group("toserver") != null) {
count++;
} else if (regexMatcher.group("message") != null) {
countType++;
} else {
// Ignoring "Store in DB :\n<?xml...."
}
}
System.out.printf("%25s%2d\n%25s%2d\n", "to server: ", count, type+": ", countType);
return countType;
}
输出
INPUT:
Send message to server:
Created post notification log dir
Created post notification log dir
Created post notification log dir
Send message to server:
Created post notification log dir
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
Store in DB :
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
INFO [a] - Server Response: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><response xaction_guid="new xaction guid" type="ok"></params></response></message>
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><request xaction_guid="new xaction guid" type="createsession"/></message>
INFO [a] - Server Response: <?xml version="1.0" encoding="UTF-8" standalone="yes"?><message schema_version="3644767c-2632-411a-9416-44f8a7dee08e"><response xaction_guid="new xaction guid" type="ok"></response></message>
COUNT:
to server: 2
create_session: 2
关于java - 如何在模式重叠时找到事件,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33822886/