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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>[GODRIVER-934] Implement compression for driver.OperationContext</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-934</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;Compression was previously implemented in the &lt;tt&gt;connection.connection&lt;/tt&gt; type, however this required the inspection of an already constructed wire message to determine if compression was allowed. Instead, the &lt;tt&gt;driver.OperationContext&lt;/tt&gt; type should handle this directly. This can be done efficiently by retrieving the command name during wire message construction, returning it, and then using that to determine if compression can be done.&lt;/p&gt;

&lt;p&gt;To hold the compression state, a &lt;tt&gt;CompressionContext&lt;/tt&gt; type is used. This type has a &lt;tt&gt;CompressWireMessage&lt;/tt&gt; method with the following signature:&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;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;  margin-top: 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;func Compress(wm []byte, commandName string, desc description.Server) ([]byte, error)&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;The &lt;tt&gt;CompressionContext&lt;/tt&gt; itself is defined as:&lt;/p&gt;
&lt;p/&gt;
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&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;
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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-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;type CompressionContext struct {&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;   Compressors []string&lt;/span&gt;&lt;/pre&gt;
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		&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;   ZlibLevel int&lt;/span&gt;&lt;/pre&gt;
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		&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;
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&lt;/table&gt;
&lt;/div&gt;
&lt;p/&gt;

&lt;p&gt;To aid in reuse of memory, global pools of &lt;tt&gt;zlib.ReaderCloser&lt;/tt&gt; and &lt;tt&gt;zlib.Writer&lt;/tt&gt; are required.&lt;/p&gt;

&lt;p&gt;The &lt;tt&gt;Compress&lt;/tt&gt; method should overwrite the provided slice with the newly compressed message. Internally, it can pull from it&apos;s own pool of &lt;tt&gt;[]byte&lt;/tt&gt;.&lt;/p&gt;</description>
                <environment></environment>
        <key id="730281">GODRIVER-934</key>
            <summary>Implement compression for driver.OperationContext</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</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="13203">Gone away</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="kris.brandow@mongodb.com">Kristofer Brandow</reporter>
                        <labels>
                    </labels>
                <created>Thu, 4 Apr 2019 23:07:52 +0000</created>
                <updated>Fri, 27 Oct 2023 20:01:27 +0000</updated>
                            <resolved>Mon, 29 Apr 2019 20:08:25 +0000</resolved>
                                                                    <component>Core API</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
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