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devel / comp.lang.java.programmer / Handle delimiter in read message

SubjectAuthor
* Handle delimiter in read messagemike
`* Handle delimiter in read messagemike
 +* Handle delimiter in read messagemike
 |`* Handle delimiter in read messagemike
 | +- Handle delimiter in read messageEric Sosman
 | `- Handle delimiter in read messageArne_Vajhøj
 `- Handle delimiter in read messageStanimir Stamenkov

1
Handle delimiter in read message

<43d5ea21-6264-4b24-ab0c-32c27cdc09c2n@googlegroups.com>

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Subject: Handle delimiter in read message
From: mikaelpetterson@hotmail.com (mike)
Injection-Date: Mon, 23 May 2022 06:09:41 +0000
Content-Type: text/plain; charset="UTF-8"
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 by: mike - Mon, 23 May 2022 06:09 UTC

Hi,

We receive a message called "chunked message" in NETCONF.
Example:

final String MSG_REPLY = "#877\r\n"
+
"<rpc-reply message-id=\"1\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"
+
"##\r\n";

I tried:

String newline = System.getProperty("line.separator");//make sure I get newline for platform.
return sb.toString().contains(newline + "##" + newline);

But it fails. Is it possible to check if the string ends with a regex pattern?

//mike

Re: Handle delimiter in read message

<08d72ee6-dd98-46ab-a0b8-ae683996b3d8n@googlegroups.com>

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Subject: Re: Handle delimiter in read message
From: mikaelpetterson@hotmail.com (mike)
Injection-Date: Mon, 23 May 2022 09:32:00 +0000
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 by: mike - Mon, 23 May 2022 09:31 UTC

måndag 23 maj 2022 kl. 08:09:48 UTC+2 skrev mike:
> Hi,
>
> We receive a message called "chunked message" in NETCONF.
> Example:
>
> final String MSG_REPLY = "#877\r\n"
> +
> "<rpc-reply message-id=\"1\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"
> +
> "##\r\n";
>
> I tried:
>
> String newline = System.getProperty("line.separator");//make sure I get newline for platform.
> return sb.toString().contains(newline + "##" + newline);
>
> But it fails. Is it possible to check if the string ends with a regex pattern?
>
> //mike

I even checked the ASCII in my buffer.

ASCII numbers is:

10 LF
35 #
35 #
10 LF

I changed my regexp:

sb.toString().matches("(?s).*\\r\\n|\\n##\\r\\n|\\n$")

but it still evaluates to false. I suspect it is DOT ALL that gives me the headache.

//mike

Re: Handle delimiter in read message

<71e3ac9a-032a-42d5-b509-884e36908b81n@googlegroups.com>

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Subject: Re: Handle delimiter in read message
From: mikaelpetterson@hotmail.com (mike)
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 by: mike - Mon, 23 May 2022 09:59 UTC

måndag 23 maj 2022 kl. 11:32:07 UTC+2 skrev mike:
> måndag 23 maj 2022 kl. 08:09:48 UTC+2 skrev mike:
> > Hi,
> >
> > We receive a message called "chunked message" in NETCONF.
> > Example:
> >
> > final String MSG_REPLY = "#877\r\n"
> > +
> > "<rpc-reply message-id=\"1\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"
> > +
> > "##\r\n";
> >
> > I tried:
> >
> > String newline = System.getProperty("line.separator");//make sure I get newline for platform.
> > return sb.toString().contains(newline + "##" + newline);
> >
> > But it fails. Is it possible to check if the string ends with a regex pattern?
> >
> > //mike
> I even checked the ASCII in my buffer.
>
> ASCII numbers is:
>
> 10 LF
> 35 #
> 35 #
> 10 LF
>
> I changed my regexp:
>
> sb.toString().matches("(?s).*\\r\\n|\\n##\\r\\n|\\n$")
>
> but it still evaluates to false. I suspect it is DOT ALL that gives me the headache.
>
> //mike

Even tried this to make sure I have only four last characters of my string..

String endofMsg = sb.toString().substring(sb.toString().length() - 4);

return endofMsg.matches("^\\r\\n|[\\n]##\\r\\n|[\\n]$");

Re: Handle delimiter in read message

<2353f4c2-b2a5-4036-9a7f-8be371b9c446n@googlegroups.com>

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Subject: Re: Handle delimiter in read message
From: mikaelpetterson@hotmail.com (mike)
Injection-Date: Mon, 23 May 2022 11:34:43 +0000
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 by: mike - Mon, 23 May 2022 11:34 UTC

måndag 23 maj 2022 kl. 12:00:06 UTC+2 skrev mike:
> måndag 23 maj 2022 kl. 11:32:07 UTC+2 skrev mike:
> > måndag 23 maj 2022 kl. 08:09:48 UTC+2 skrev mike:
> > > Hi,
> > >
> > > We receive a message called "chunked message" in NETCONF.
> > > Example:
> > >
> > > final String MSG_REPLY = "#877\r\n"
> > > +
> > > "<rpc-reply message-id=\"1\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"
> > > +
> > > "##\r\n";
> > >
> > > I tried:
> > >
> > > String newline = System.getProperty("line.separator");//make sure I get newline for platform.
> > > return sb.toString().contains(newline + "##" + newline);
> > >
> > > But it fails. Is it possible to check if the string ends with a regex pattern?
> > >
> > > //mike
> > I even checked the ASCII in my buffer.
> >
> > ASCII numbers is:
> >
> > 10 LF
> > 35 #
> > 35 #
> > 10 LF
> >
> > I changed my regexp:
> >
> > sb.toString().matches("(?s).*\\r\\n|\\n##\\r\\n|\\n$")
> >
> > but it still evaluates to false. I suspect it is DOT ALL that gives me the headache.
> >
> > //mike
> Even tried this to make sure I have only four last characters of my string.
>
> String endofMsg = sb.toString().substring(sb.toString().length() - 4);
>
> return endofMsg.matches("^\\r\\n|[\\n]##\\r\\n|[\\n]$");

I found out I can do:

String endofMsg = sb.toString().substring(sb.toString().length() - 6);
return endofMsg.matches("\\r\\n##\\r\\n|.*\\n##\\n$");

I had to use the last 6 characters since newline is different for each platform.

//mike

Re: Handle delimiter in read message

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Subject: Re: Handle delimiter in read message
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 by: Eric Sosman - Mon, 23 May 2022 14:33 UTC

On 5/23/2022 9:31 AM, e.d.pro...@gmail.com wrote:
>> I found out I can do:
>>
>> String endofMsg = sb.toString().substring(sb.toString().length() - 6);
>> return endofMsg.matches("\\r\\n##\\r\\n|.*\\n##\\n$");
>>
>> I had to use the last 6 characters since newline is different for each platform.
>>
>> //mike
>
> I'm not clear what is the problem you're trying to solve, but System.getProperty("line.separator") is system dependent, so if you're running that on one system to get a value to use on a different system, your value will be wrong if the systems are different. *nix uses \n for linefeed, Windows uses \r\n , so you're checking for the presence of \n if you want to check for a linefeed.

Also (if I recall correctly), various Internet RFC's require CR-LF
line terminators, regardless of the system sending the lines. I don't
know whether mike's messages follow such a protocol, but many do.

His best bet may be to recognize all of CR, LF, and CR-LF as line
terminators, and maybe even LF-CR as well.

--
esosman@comcast-dot-net.invalid
Look on my code, ye Hackers, and guffaw!

--
This email has been checked for viruses by AVG.
https://www.avg.com

Re: Handle delimiter in read message

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 by: Arne Vajhøj - Mon, 23 May 2022 15:21 UTC

On 5/23/2022 7:34 AM, mike wrote:
> måndag 23 maj 2022 kl. 12:00:06 UTC+2 skrev mike:
>> måndag 23 maj 2022 kl. 11:32:07 UTC+2 skrev mike:
>>> måndag 23 maj 2022 kl. 08:09:48 UTC+2 skrev mike:
>>>> We receive a message called "chunked message" in NETCONF.
>>>> Example:
>>>>
>>>> final String MSG_REPLY = "#877\r\n"
>>>> +
>>>> "<rpc-reply message-id=\"1\" xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"
>>>> +
>>>> "##\r\n";
>>>>
>>>> I tried:
>>>>
>>>> String newline = System.getProperty("line.separator");//make sure I get newline for platform.
>>>> return sb.toString().contains(newline + "##" + newline);
>>>>
>>>> But it fails. Is it possible to check if the string ends with a regex pattern?
>>>>
>>>> //mike
>>> I even checked the ASCII in my buffer.
>>>
>>> ASCII numbers is:
>>>
>>> 10 LF
>>> 35 #
>>> 35 #
>>> 10 LF
>>>
>>> I changed my regexp:
>>>
>>> sb.toString().matches("(?s).*\\r\\n|\\n##\\r\\n|\\n$")
>>>
>>> but it still evaluates to false. I suspect it is DOT ALL that gives me the headache.
>>>
>> Even tried this to make sure I have only four last characters of my string.
>>
>> String endofMsg = sb.toString().substring(sb.toString().length() - 4);
>>
>> return endofMsg.matches("^\\r\\n|[\\n]##\\r\\n|[\\n]$");
>
> I found out I can do:
>
> String endofMsg = sb.toString().substring(sb.toString().length() - 6);
> return endofMsg.matches("\\r\\n##\\r\\n|.*\\n##\\n$");
>
> I had to use the last 6 characters since newline is different for each platform.

This seems to work:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EndTest {
private static final Pattern re =
Pattern.compile("^#\\d+\\v+(.*)##\\v+$", Pattern.MULTILINE +
Pattern.DOTALL);
public static void test(String s) {
System.out.println(s);
Matcher m = re.matcher(s);
if(m.find()) {
System.out.println("Match: " + m.group(1));
} else {
System.out.println("No match");
}
}
public static void main(String[] args) {
test("ABC");
String msg = "#877\r\n"
+
"<rpc-reply message-id=\"1\"
xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><data
xmlns=\"urn:ietf:params:xml:ns:netconf:base:1.0\"><netconf-server
xmlns=\"urn:ietf:params:xml:ns:yang:ietf-netconf-server\"><listen><endpoint><name>default-ssh</name><ssh><tcp-server-parameters><local-address>0.0.0.0</local-address><keepalives><idle-time>1</idle-time><max-probes>10</max-probes><probe-interval>5</probe-interval></keepalives></tcp-server-parameters><ssh-server-parameters><server-identity><host-key><name>default-key</name><public-key><keystore-reference>genkey</keystore-reference></public-key></host-key></server-identity><client-authentication><supported-authentication-methods><publickey/><passsword/><other>interactive</other></supported-authentication-methods><users/></client-authentication></ssh-server-parameters></ssh></endpoint></listen></netconf-server></data></rpc-reply>\r\n"

+
"##\r\n";
test(msg);
}
}

Arne

Re: Handle delimiter in read message

<t7obs5$vmi$1@dont-email.me>

  copy mid

https://news.novabbs.org/devel/article-flat.php?id=423&group=comp.lang.java.programmer#423

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From: s7an10@netscape.net (Stanimir Stamenkov)
Newsgroups: comp.lang.java.programmer
Subject: Re: Handle delimiter in read message
Date: Tue, 7 Jun 2022 23:19:17 +0300
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Openpgp: preference=signencrypt
 by: Stanimir Stamenkov - Tue, 7 Jun 2022 20:19 UTC

Mon, 23 May 2022 02:31:59 -0700 (PDT), /mike/:

> I changed my regexp:
>
> sb.toString().matches("(?s).*\\r\\n|\\n##\\r\\n|\\n$")
>
> but it still evaluates to false. I suspect it is DOT ALL that gives me the headache.

Maybe you really mean (note the grouping):

sb.toString().matches("(?s).*(\\r\\n|\\n##\\r\\n|\\n)$")

or even:

sb.toString().matches("(?s).*\\r?\\n(##\\r?\\n?)?$")

--
Stanimir

1
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