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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>[CDRIVER-4079] Always initialize reply in stream fetch functions</title>
                <link>https://jira.mongodb.org/browse/CDRIVER-4079</link>
                <project id="10030" key="CDRIVER">C Driver</project>
                    <description>&lt;p&gt;&lt;b&gt;Motivation&lt;/b&gt;&lt;/p&gt;

&lt;p&gt;A common pattern in libmongoc is to initialize an output BSON reply regardless of whether the function call succeeded or failed. This makes it simpler for callers to know how to clean up after:&lt;/p&gt;

&lt;p/&gt;
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					&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;ok = mongoc_client_command_simple (client, db_name, &amp;amp;cmd, read_prefs, &amp;amp;reply, &amp;amp;error);&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if (ok) {&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;    // handle success&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;} else {&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: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    // handle failure&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&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;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&amp;nbsp;&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;   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;bson_destroy (&amp;amp;reply);&lt;/span&gt;&lt;/pre&gt;
			&lt;/td&gt;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;The functions following functions do not follow this pattern: &lt;/p&gt;
&lt;ul class=&quot;alternate&quot; type=&quot;square&quot;&gt;
	&lt;li&gt;&lt;tt&gt;mongoc_cluster_stream_for_reads&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;mongoc_cluster_stream_for_writes&lt;/tt&gt;&lt;/li&gt;
	&lt;li&gt;&lt;tt&gt;mongoc_cluster_stream_for_server&lt;/tt&gt;&lt;/li&gt;
&lt;/ul&gt;


&lt;p&gt;They only initialize a BSON reply on failure.&lt;/p&gt;

&lt;p&gt;Expecting uninitialized &lt;tt&gt;bson_t&lt;/tt&gt; as an output argument has its own problems (see &lt;a href=&quot;https://jira.mongodb.org/browse/CDRIVER-3368&quot; title=&quot;Audit documentation to make it clear that reply bson_t&amp;#39;s should be stack-allocated&quot; class=&quot;issue-link&quot; data-issue-key=&quot;CDRIVER-3368&quot;&gt;&lt;del&gt;CDRIVER-3368&lt;/del&gt;&lt;/a&gt;). But in this case this seems like surprising internal API.&lt;/p&gt;

&lt;p&gt;&lt;b&gt;Scope&lt;/b&gt;&lt;br/&gt;
Modify the above functions to always initialize the &lt;tt&gt;bson_t&lt;/tt&gt; reply on failure and update callers to always call &lt;tt&gt;bson_destroy&lt;/tt&gt; after.&lt;/p&gt;</description>
                <environment></environment>
        <key id="1817127">CDRIVER-4079</key>
            <summary>Always initialize reply in stream fetch functions</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="5" iconUrl="https://jira.mongodb.org/images/icons/priorities/trivial.svg">Trivial - P5</priority>
                        <status id="10038" iconUrl="https://jira.mongodb.org/images/icons/subtask.gif" description="">Backlog</status>
                    <statusCategory id="2" key="new" colorName="default"/>
                                    <resolution id="-1">Unresolved</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kevin.albertson@mongodb.com">Kevin Albertson</reporter>
                        <labels>
                            <label>neweng</label>
                    </labels>
                <created>Wed, 14 Jul 2021 01:19:49 +0000</created>
                <updated>Fri, 15 Apr 2022 18:38:32 +0000</updated>
                                                                                                <votes>0</votes>
                                    <watches>2</watches>
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