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    <title>MongoDB Jira</title>
    <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-62231] Methods for iterating a DBClientCursor should assert that init() has been called</title>
                <link>https://jira.mongodb.org/browse/SERVER-62231</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;In order to fully initialize a &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f114b2857bac3830436df4c319fd2cb562a1ff1b/src/mongo/client/dbclient_cursor.h&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DBClientCursor&lt;/tt&gt;&lt;/a&gt; object, one must first call its constructor and then subsequently call &lt;a href=&quot;https://github.com/mongodb/mongo/blob/f114b2857bac3830436df4c319fd2cb562a1ff1b/src/mongo/client/dbclient_cursor.h#L207&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;&lt;tt&gt;DBClientCursor::init()&lt;/tt&gt;&lt;/a&gt;. If the programmer makes a mistake and fails to call &lt;tt&gt;init()&lt;/tt&gt;, the cursor can silently return no results rather than raising an error. Consider code like this:&lt;/p&gt;

&lt;p/&gt;
&lt;div id=&quot;syntaxplugin&quot; class=&quot;syntaxplugin&quot; style=&quot;border: 1px dashed #bbb; border-radius: 5px !important; overflow: auto; max-height: 30em;&quot;&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot; border=&quot;0&quot; width=&quot;100%&quot; style=&quot;font-size: 1em; line-height: 1.4em !important; font-weight: normal; font-style: normal; color: black;&quot;&gt;
		&lt;tbody &gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;  margin-top: 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;DBClientCursor cursor{...};&lt;/span&gt;&lt;/pre&gt;
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				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;while (cursor-&amp;gt;more()) {&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    BSONObj obj = cursor-&amp;gt;nextSafe();&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // Do something with &apos;obj&apos;.&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
				&lt;tr id=&quot;syntaxplugin_code_and_gutter&quot;&gt;
						&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;   margin-bottom: 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;}&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
		&lt;/tr&gt;
			&lt;/tbody&gt;
&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;This code is incorrect, since it fails to call &lt;tt&gt;init()&lt;/tt&gt;. However, the call to &lt;tt&gt;cursor-&amp;gt;more()&lt;/tt&gt; simply returns false rather than throwing or tripping an assertion, so the bug could easily go undetected. We should improve the code to &lt;tt&gt;uassert()&lt;/tt&gt; or possibly &lt;tt&gt;invariant()&lt;/tt&gt; in this scenario.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1955684">SERVER-62231</key>
            <summary>Methods for iterating a DBClientCursor should assert that init() has been called</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="catalin.sumanaru@mongodb.com">Catalin Sumanaru</assignee>
                                    <reporter username="david.storch@mongodb.com">David Storch</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 22 Dec 2021 19:40:33 +0000</created>
                <updated>Sun, 29 Oct 2023 21:44:45 +0000</updated>
                            <resolved>Tue, 28 Jun 2022 17:00:52 +0000</resolved>
                                                    <fixVersion>6.1.0-rc0</fixVersion>
                                    <component>Internal Client</component>
                                        <votes>0</votes>
                                    <watches>5</watches>
                                                                                                                <comments>
                            <comment id="4645430" author="xgen-internal-githook" created="Tue, 28 Jun 2022 16:57:42 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{&apos;name&apos;: &apos;Catalin Sumanaru&apos;, &apos;email&apos;: &apos;catalin.sumanaru@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-62231&quot; title=&quot;Methods for iterating a DBClientCursor should assert that init() has been called&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-62231&quot;&gt;&lt;del&gt;SERVER-62231&lt;/del&gt;&lt;/a&gt; Ensure DBClientCursor methods call init&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/e6b088a0991af9573d6e17b1ee9beb3fe969500d&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/e6b088a0991af9573d6e17b1ee9beb3fe969500d&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="4599219" author="JIRAUSER1259305" created="Tue, 7 Jun 2022 12:33:55 +0000"  >&lt;p&gt;Reserved for Catalin Sumanaru as neweng intern ticket work.&lt;/p&gt;</comment>
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                            <issuelinktype id="10012">
                    <name>Related</name>
                                                                <inwardlinks description="is related to">
                                        <issuelink>
            <issuekey id="1922389">SERVER-61385</issuekey>
        </issuelink>
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