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    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-47203] LOGV2 macros should protect against forgetting trailing commas to separate arguments</title>
                <link>https://jira.mongodb.org/browse/SERVER-47203</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;One of the most common mistakes observed during the code reviews for updating the sharding log lines based on &lt;a href=&quot;https://github.com/mongodb/mongo/blob/a5a4ec4324381c04597bc8d8fd05aa2f1994786b/src/mongo/logv2/README.md&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;the LOGV2 style guide&lt;/a&gt; (see &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-46799&quot; title=&quot;Update sharding log lines to adhere to LOGV2 style guide&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-46799&quot;&gt;&lt;del&gt;SERVER-46799&lt;/del&gt;&lt;/a&gt;) was omitting a trailing comma to separate the format string from the message string, or to separate the message string from the first attribute name. There were 30 instances of this mistake made across the 10 individuals (myself included) who worked on those changes.&lt;/p&gt;

&lt;p/&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: #2B91AF; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;+++ b/src/mongo/s/server.cpp&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;@@ -651,7 +651,7 @@ ExitCode runMongosServer(ServiceContext* serviceContext) {&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;     if (!status.isOK()) {&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: gray; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;                     &quot;Error initializing authorization data: {error}&quot;,&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
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&lt;p/&gt;

&lt;p&gt;This likely occurred due to the way in which engineers went about copy-pasting from the format string to create a sensible message string. It&apos;d be great if the &lt;tt&gt;LOGV2&lt;/tt&gt; macros could protect against this, although perhaps unnecessary if we aren&apos;t going to require format strings in addition to message strings for new log messages. My idea for an approach would be to have the format and message strings be distinct nominal types and to have user-defined suffixes for creating the appropriate type. &lt;a href=&quot;https://en.cppreference.com/w/cpp/language/user_literal&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;The compiler would error if two string literals with different ud-suffixes were attempted to be concatenated&lt;/a&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1298169">SERVER-47203</key>
            <summary>LOGV2 macros should protect against forgetting trailing commas to separate arguments</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="13201">Fixed</resolution>
                                        <assignee username="backlog-server-security">Backlog - Security Team</assignee>
                                    <reporter username="max.hirschhorn@mongodb.com">Max Hirschhorn</reporter>
                        <labels>
                    </labels>
                <created>Tue, 31 Mar 2020 13:03:42 +0000</created>
                <updated>Sun, 29 Oct 2023 22:10:10 +0000</updated>
                            <resolved>Wed, 4 Oct 2023 17:09:11 +0000</resolved>
                                                    <fixVersion>7.2.0-rc0</fixVersion>
                                    <component>Logging</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="5752787" author="billy.donahue" created="Wed, 4 Oct 2023 17:09:56 +0000"  >&lt;p&gt;fixed by &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-81602&quot; title=&quot;Remove support for formatMsg from LOGV2&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-81602&quot;&gt;&lt;del&gt;SERVER-81602&lt;/del&gt;&lt;/a&gt;, after which there are no more fmt-message strings.&lt;/p&gt;</comment>
                            <comment id="4375678" author="JIRAUSER1262719" created="Thu, 24 Feb 2022 21:55:40 +0000"  >&lt;p&gt;We haven&#8217;t heard back from you for at least one calendar year, so this issue is being closed. If this is still an issue for you, please provide additional information and we will reopen the ticket.&lt;/p&gt;</comment>
                            <comment id="3018532" author="max.hirschhorn@10gen.com" created="Tue, 31 Mar 2020 13:06:41 +0000"  >&lt;p&gt;In order to catch these mistakes during code review, I would apply the patches locally and then spot-check all matches of /&quot;$/ in the diff.&lt;/p&gt;</comment>
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