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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>
    </build-info>


<item>
            <title>[GODRIVER-556] mongo.Client should provide topology type</title>
                <link>https://jira.mongodb.org/browse/GODRIVER-556</link>
                <project id="14289" key="GODRIVER">Go Driver</project>
                    <description>&lt;p&gt;Mongo tools, in particular, often need to know the topology type they are connecting to.&#160; Rather than calling RunCommand with &apos;ismaster&apos; and parsing the results, the Client object should provide a method to retrieve the topology type.&lt;/p&gt;</description>
                <environment></environment>
        <key id="605397">GODRIVER-556</key>
            <summary>mongo.Client should provide topology type</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="4" iconUrl="https://jira.mongodb.org/images/icons/priorities/minor.svg">Minor - P4</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="12300">Won&apos;t Do</resolution>
                                        <assignee username="kevin.albertson@mongodb.com">Kevin Albertson</assignee>
                                    <reporter username="david.golden@mongodb.com">David Golden</reporter>
                        <labels>
                    </labels>
                <created>Sat, 15 Sep 2018 13:06:36 +0000</created>
                <updated>Mon, 27 Mar 2023 17:42:48 +0000</updated>
                            <resolved>Mon, 27 Mar 2023 17:42:48 +0000</resolved>
                                                                                        <votes>0</votes>
                                    <watches>7</watches>
                                                                                                                <comments>
                            <comment id="5286124" author="thomas.zembowicz" created="Mon, 20 Mar 2023 19:42:55 +0000"  >&lt;p&gt;&lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=esha.bhargava%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;esha.bhargava@mongodb.com&quot;&gt;esha.bhargava@mongodb.com&lt;/a&gt; thanks for the ping. While a Topology() method would be nice I think using SDAM events (TopologyDescriptionChanged) is a totally fine workaround and would be an improvement over how ADF is determining topology today.&lt;/p&gt;</comment>
                            <comment id="5256726" author="david.golden" created="Tue, 7 Mar 2023 20:44:29 +0000"  >&lt;p&gt;I defer to &lt;a href=&quot;https://jira.mongodb.org/secure/ViewProfile.jspa?name=thomas.zembowicz%40mongodb.com&quot; class=&quot;user-hover&quot; rel=&quot;thomas.zembowicz@mongodb.com&quot;&gt;thomas.zembowicz@mongodb.com&lt;/a&gt; as we may have a different desired workaround.&lt;/p&gt;</comment>
                            <comment id="5256707" author="kevin.albertson" created="Tue, 7 Mar 2023 20:39:22 +0000"  >&lt;p&gt;I prefer not to add a getter for &lt;tt&gt;description.Topology&lt;/tt&gt; to the API. IMO this is not a common use case for the average user.&lt;br/&gt;
&#160;&lt;br/&gt;
Is creating a TopologyDescriptionChanged listener sufficient? Example:&lt;br/&gt;
&#160;&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;var latestTD *description.Topology&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;var lockTD sync.RWMutex&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;&amp;nbsp;&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;client, err := mongo.Connect(context.TODO(), options.Client().ApplyURI(uri).SetServerMonitor(&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;	&amp;amp;event.ServerMonitor{&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;		TopologyDescriptionChanged: func(tdce *event.TopologyDescriptionChangedEvent) {&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;			lockTD.Lock()&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;			defer lockTD.Unlock()&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;			latestTD = &amp;amp;tdce.NewDescription&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;		},&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;	},&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;&#160;&lt;br/&gt;
Here is a &lt;a href=&quot;https://github.com/kevinAlbs/go-bootstrap/blob/14e4b3205c96c097e4bd3aaa9c7fe6dcfcc57282/investigations/G556/main.go&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;runnable example&lt;/a&gt;.&lt;br/&gt;
&#160;&lt;/p&gt;</comment>
                            <comment id="2012593" author="kris.brandow" created="Mon, 24 Sep 2018 20:04:10 +0000"  >&lt;p&gt;I don&apos;t a problem with doing this. We can provide whatever the type that the topology.Topology has.&lt;/p&gt;</comment>
                            <comment id="2004914" author="david.golden" created="Mon, 17 Sep 2018 14:44:14 +0000"  >&lt;p&gt;It is static, even if not immediately useful.  When a new topology object is created, it&apos;s initialized with a topology description with type &quot;unknown&quot;.   If a user wants to ensure the topology is discovered, the user can Ping first.&lt;/p&gt;</comment>
                            <comment id="2004860" author="jeff.yemin" created="Mon, 17 Sep 2018 14:03:06 +0000"  >&lt;p&gt;It&apos;s not static data.&#160; The driver doesn&apos;t know the topology in all cases until at least one server has responded (asynchronously) to an &lt;tt&gt;isMaster&lt;/tt&gt;&#160;command via SDAM.&#160; So the proposed method would have to take a &lt;tt&gt;Context&lt;/tt&gt; and block until it either discovers the topology type or until the Context&apos;s deadline is reached.&#160;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;

&lt;p&gt;&#160;&lt;/p&gt;</comment>
                            <comment id="2004853" author="david.golden" created="Mon, 17 Sep 2018 13:54:53 +0000"  >&lt;p&gt;Coding up an event listener is pretty heavyweight to retrieve static data only needed once.&#160; I think all that&apos;s needed is handing out a copy of the &lt;tt&gt;description.Topology&lt;/tt&gt;, which is trivial for the driver to provide.&#160; It may not be a common case for applications, but it is a not uncommon case for tests, tools and other command line utilities.&lt;/p&gt;</comment>
                            <comment id="2004464" author="jeff.yemin" created="Sun, 16 Sep 2018 21:51:52 +0000"  >&lt;p&gt;Once&#160;&lt;a href=&quot;https://jira.mongodb.org/browse/GODRIVER-41&quot; title=&quot;Implement SDAM Monitoring specification&quot; class=&quot;issue-link&quot; data-issue-key=&quot;GODRIVER-41&quot;&gt;&lt;del&gt;GODRIVER-41&lt;/del&gt;&lt;/a&gt; is closed, an application can register an SDAM event listener and determine the topology from the events.&#160; It&apos;s a bit more complicated to code, but I also don&apos;t imagine this is a common use case.&lt;/p&gt;</comment>
                    </comments>
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