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<title data-rh="true">Circuit Breaker | foomo project docs</title><meta data-rh="true" name="viewport" content="width=device-width,initial-scale=1"><meta data-rh="true" name="twitter:card" content="summary_large_image"><meta data-rh="true" property="og:url" content="https://www.foomo.org/docs/projects/libraries/keel-circuit-breaker"><meta data-rh="true" name="docusaurus_locale" content="en"><meta data-rh="true" name="docsearch:language" content="en"><meta data-rh="true" name="docusaurus_version" content="current"><meta data-rh="true" name="docusaurus_tag" content="docs-default-current"><meta data-rh="true" name="docsearch:version" content="current"><meta data-rh="true" name="docsearch:docusaurus_tag" content="docs-default-current"><meta data-rh="true" property="og:title" content="Circuit Breaker | foomo project docs"><meta data-rh="true" name="description" content="Sometimes things go wrong and a service does not respond anymore. Be it because of maintainance or because the whole data center burned to the ground. In such a scenario, you might not want to wait until your request times out. This is where circuit breakers come in handy."><meta data-rh="true" property="og:description" content="Sometimes things go wrong and a service does not respond anymore. Be it because of maintainance or because the whole data center burned to the ground. In such a scenario, you might not want to wait until your request times out. This is where circuit breakers come in handy."><link data-rh="true" rel="icon" href="/img/favicon.ico"><link data-rh="true" rel="canonical" href="https://www.foomo.org/docs/projects/libraries/keel-circuit-breaker"><link data-rh="true" rel="alternate" href="https://www.foomo.org/docs/projects/libraries/keel-circuit-breaker" hreflang="en"><link data-rh="true" rel="alternate" href="https://www.foomo.org/docs/projects/libraries/keel-circuit-breaker" hreflang="x-default"><link data-rh="true" rel="preconnect" href="https://SUATUVZDDM-dsn.algolia.net" crossorigin="anonymous"><link rel="alternate" type="application/rss+xml" href="/blog/rss.xml" title="foomo project docs RSS Feed">
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class="breadcrumbs__link" href="/"><svg viewBox="0 0 24 24" class="breadcrumbHomeIcon_YNFT"><path d="M10 19v-5h4v5c0 .55.45 1 1 1h3c.55 0 1-.45 1-1v-7h1.7c.46 0 .68-.57.33-.87L12.67 3.6c-.38-.34-.96-.34-1.34 0l-8.36 7.53c-.34.3-.13.87.33.87H5v7c0 .55.45 1 1 1h3c.55 0 1-.45 1-1z" fill="currentColor"></path></svg></a></li><li class="breadcrumbs__item"><span class="breadcrumbs__link">libraries</span><meta itemprop="position" content="1"></li><li itemscope="" itemprop="itemListElement" itemtype="https://schema.org/ListItem" class="breadcrumbs__item breadcrumbs__item--active"><span class="breadcrumbs__link" itemprop="name">Circuit Breaker</span><meta itemprop="position" content="2"></li></ul></nav><div class="tocCollapsible_ETCw theme-doc-toc-mobile tocMobile_ITEo"><button type="button" class="clean-btn tocCollapsibleButton_TO0P">On this page</button></div><div class="theme-doc-markdown markdown"><h1>Circuit Breaker</h1><p>Sometimes things go wrong and a service does not respond anymore. Be it because of maintainance or because the whole data center burned to the ground. In such a scenario, you might not want to wait until your request times out. This is where circuit breakers come in handy.</p><p>Simply put a circuit breaker has three different states:</p><p><img loading="lazy" src="/assets/images/keel-circuit-breaker-states-35a04af12a3c710db897e18570d5b057.jpg" width="5974" height="2678" class="img_ev3q"></p><p>We did not re-invent the wheel (yet), but rather used an existing circuit breaker. However, we extended the functionality a bit. More on that later. For referance, here are links to the <a href="https://github.com/sony/gobreaker" target="_blank" rel="noopener noreferrer">underlying circuit breaker</a> and some more <a href="https://learn.microsoft.com/en-us/previous-versions/msp-n-p/dn589784(v=pandp.10)?redirectedfrom=MSDN" target="_blank" rel="noopener noreferrer">information on circuit breakers in general</a>.</p><h2 class="anchor anchorWithStickyNavbar_LWe7" id="how-to-use">How to use<a href="#how-to-use" class="hash-link" aria-label="Direct link to How to use" title="Direct link to How to use"></a></h2><p>In order to configure the circuit breaker there are two kinds of configuration. The "base" configuration using the <code>CircuitBreakerSettings</code> and optional configuration using <code>CircuitBreakerOptions</code>.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="circuitbreakersettings">CircuitBreakerSettings<a href="#circuitbreakersettings" class="hash-link" aria-label="Direct link to CircuitBreakerSettings" title="Direct link to CircuitBreakerSettings"></a></h3><p>The settings are relatively straight forward and the same as with the underlying repository - with one exception. Our settings are missing the <code>IsSuccessful</code> field.</p><div><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockTitle_Ktv7">net/http/roundtripware/circuitbreaker.go</div><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">loading</span><span class="token operator" style="color:rgb(137, 221, 255)">...</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div style="font-size:.9em;font-weight:600;color:#0E75DD;text-align:center;padding-bottom:13px;text-decoration:underline"><a href="https://github.com/foomo/keel/blob/b14b59b0c4ff880827f102c08c43b1de2989367f/net/http/roundtripware/circuitbreaker.go#L27-L49" target="_blank">See full example on GitHub</a></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="circuitbreakeroptions">CircuitBreakerOptions<a href="#circuitbreakeroptions" class="hash-link" aria-label="Direct link to CircuitBreakerOptions" title="Direct link to CircuitBreakerOptions"></a></h3><p>Currently, there are two options one for metrics and one for somewhat advanced usage.</p><h4 class="anchor anchorWithStickyNavbar_LWe7" id="metrics">Metrics<a href="#metrics" class="hash-link" aria-label="Direct link to Metrics" title="Direct link to Metrics"></a></h4><p>The option for metrics is, again, straigth forward. When the <code>CircuitBreakerWithMetric</code> option is used the roundtripware will create a counter on the provided meter and count the number of requests.</p><p>The attributes added to every count are:</p><ul><li><code>previous_state</code> (String): the state of the circuit breaker <strong>before</strong> the current request. Either "closed", "half-open" or "open"</li><li><code>current_state</code> (String): the state of the circuit breaker <strong>after</strong> the current request. Either "closed", "half-open" or "open"</li><li><code>state_change</code> (Bool): helper containing <code>current_state</code> != <code>previous_state</code></li><li><code>error</code> (Bool): false if the request was not passed through or was unsuccessful</li></ul><div><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockTitle_Ktv7">net/http/roundtripware/circuitbreaker.go</div><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">loading</span><span class="token operator" style="color:rgb(137, 221, 255)">...</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div style="font-size:.9em;font-weight:600;color:#0E75DD;text-align:center;padding-bottom:13px;text-decoration:underline"><a href="https://github.com/foomo/keel/blob/b14b59b0c4ff880827f102c08c43b1de2989367f/net/http/roundtripware/circuitbreaker.go#L74-L78" target="_blank">See full example on GitHub</a></div></div><h4 class="anchor anchorWithStickyNavbar_LWe7" id="issuccessful">IsSuccessful<a href="#issuccessful" class="hash-link" aria-label="Direct link to IsSuccessful" title="Direct link to IsSuccessful"></a></h4><p>As mentioned previously, the IsSuccessful field was removed from the basic settings. The reason is that the signature of that function was a bit limiting. As you can see below our <code>IsSuccessful</code>-function can use the request and response. Additionally, if <code>copyReqBody</code> and/or <code>copyRespBody</code> are set to true, you can even read from the respective body, without worrying about consuming the io.ReadCloser.</p><div><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockTitle_Ktv7">net/http/roundtripware/circuitbreaker.go</div><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">loading</span><span class="token operator" style="color:rgb(137, 221, 255)">...</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><div style="font-size:.9em;font-weight:600;color:#0E75DD;text-align:center;padding-bottom:13px;text-decoration:underline"><a href="https://github.com/foomo/keel/blob/b14b59b0c4ff880827f102c08c43b1de2989367f/net/http/roundtripware/circuitbreaker.go#L93-L97" target="_blank">See full example on GitHub</a></div></div><p>The ignore value that is returned alongside an error indicates whether the result of the call should be registered with the circuit breaker. For most use cases it should be set to false.</p><p>When the <code>IsSuccessful</code>-function returns an error (and the ignore value is set to false), the request will be counted as unsuccessful. Accordingly, a nil error paired with ignored set to false indicates a successful request.</p><h3 class="anchor anchorWithStickyNavbar_LWe7" id="examples">Examples<a href="#examples" class="hash-link" aria-label="Direct link to Examples" title="Direct link to Examples"></a></h3><p>Let's say we want to stop sending requests once we encountered three consecutive failures.</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">client </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NewHTTPClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">HTTPClientWithRoundTripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">l</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CircuitBreaker</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">&</span><span class="token plain">roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">CircuitBreakerSettings</span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> Name</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"my little circuit breaker™"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// 2 requests can pass in half-open state & it takes 2 consecutive,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// successful requests to change to closed state</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> MaxRequests</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">2</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// counts are not reset in closed state</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> Interval</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// breaker will go from open to half-open state after 30s</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> Timeout</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">30</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain"> time</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Second</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// go to open state after the 3rd consecutive, unsuccessful request</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> ReadyToTrip</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">func</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">counts gobreaker</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">bool</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">ConsecutiveFailures </span><span class="token operator" style="color:rgb(137, 221, 255)">>=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">3</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Now lets say we see we also want to detect network problems such as a BadGateway. For this we can use the <code>IsSuccessful</code> option.</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">client </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NewHTTPClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">HTTPClientWithRoundTripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">l</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CircuitBreaker</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">&</span><span class="token plain">roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">CircuitBreakerSettings</span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// as before ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CircuitBreakerWithIsSuccessful</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">func</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">err </span><span class="token builtin" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> req </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">http</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Request</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> resp </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">http</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Response</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token builtin" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">bool</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">if</span><span class="token plain"> err </span><span class="token operator" style="color:rgb(137, 221, 255)">!=</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">nil</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">if</span><span class="token plain"> resp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">StatusCode </span><span class="token operator" style="color:rgb(137, 221, 255)">>=</span><span class="token plain"> http</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">StatusInternalServerError </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> errors</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">New</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token string" style="color:rgb(195, 232, 141)">"invalid status code"</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">nil</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><p>Lastly, let's assume we use the client for multiple different endpoints. And we only want to base the circuit breakers state on a single endpoint, but stop request on all endpoints once the breaker changes to open. Again we can use the IsSuccessful option and ignore certain endpoints.</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain">client </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">NewHTTPClient</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> keelhttp</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">HTTPClientWithRoundTripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">l</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CircuitBreaker</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token operator" style="color:rgb(137, 221, 255)">&</span><span class="token plain">roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">CircuitBreakerSettings</span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// as before ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> roundtripware</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token function" style="color:rgb(130, 170, 255)">CircuitBreakerWithIsSuccessful</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">func</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">err </span><span class="token builtin" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> req </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">http</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Request</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> resp </span><span class="token operator" style="color:rgb(137, 221, 255)">*</span><span class="token plain">http</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Response</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token builtin" style="color:rgb(130, 170, 255)">error</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">bool</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">if</span><span class="token plain"> req</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">URL</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Path </span><span class="token operator" style="color:rgb(137, 221, 255)">!=</span><span class="token plain"> </span><span class="token string" style="color:rgb(195, 232, 141)">"/important/path"</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token comment" style="color:rgb(105, 112, 152);font-style:italic">// possibly more checks ...</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain" style="display:inline-block"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> err</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">true</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"> </span><span class="token boolean" style="color:rgb(255, 88, 116)">false</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"></span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path d="M21,7L9,19L3.5,13.5L4.91,12.09L9,16.17L19.59,5.59L21,7Z"></path></svg></span></button></div></div></div><h3 class="anchor anchorWithStickyNavbar_LWe7" id="general-advice--notes-of-caution">General advice & notes of caution<a href="#general-advice--notes-of-caution" class="hash-link" aria-label="Direct link to General advice & notes of caution" title="Direct link to General advice & notes of caution"></a></h3><h4 class="anchor anchorWithStickyNavbar_LWe7" id="using-ratios-in-readytotrip">Using ratios in ReadyToTrip<a href="#using-ratios-in-readytotrip" class="hash-link" aria-label="Direct link to Using ratios in ReadyToTrip" title="Direct link to Using ratios in ReadyToTrip"></a></h4><p>When using ratios in ready to trip, the <code>Interval</code> should be set to a non-zero value in order to reset the counts periodically. Otherwise, after a long period of successful requests it will also take a long time to impact the ratio and trip the breaker.</p><div class="language-go codeBlockContainer_Ckt0 theme-code-block" style="--prism-color:#bfc7d5;--prism-background-color:#292d3e"><div class="codeBlockContent_biex"><pre tabindex="0" class="prism-code language-go codeBlock_bY9V thin-scrollbar"><code class="codeBlockLines_e6Vv"><span class="token-line" style="color:#bfc7d5"><span class="token plain"> ReadyToTrip</span><span class="token punctuation" style="color:rgb(199, 146, 234)">:</span><span class="token plain"> </span><span class="token keyword" style="font-style:italic">func</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">counts gobreaker</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token builtin" style="color:rgb(130, 170, 255)">bool</span><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">{</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> failureRatio </span><span class="token operator" style="color:rgb(137, 221, 255)">:=</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">float64</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">TotalFailures</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">/</span><span class="token plain"> </span><span class="token function" style="color:rgb(130, 170, 255)">float64</span><span class="token punctuation" style="color:rgb(199, 146, 234)">(</span><span class="token plain">counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Requests</span><span class="token punctuation" style="color:rgb(199, 146, 234)">)</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token keyword" style="font-style:italic">return</span><span class="token plain"> counts</span><span class="token punctuation" style="color:rgb(199, 146, 234)">.</span><span class="token plain">Requests </span><span class="token operator" style="color:rgb(137, 221, 255)">>=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">3</span><span class="token plain"> </span><span class="token operator" style="color:rgb(137, 221, 255)">&&</span><span class="token plain"> failureRatio </span><span class="token operator" style="color:rgb(137, 221, 255)">>=</span><span class="token plain"> </span><span class="token number" style="color:rgb(247, 140, 108)">0.6</span><span class="token plain"></span><br></span><span class="token-line" style="color:#bfc7d5"><span class="token plain"> </span><span class="token punctuation" style="color:rgb(199, 146, 234)">}</span><span class="token punctuation" style="color:rgb(199, 146, 234)">,</span><br></span></code></pre><div class="buttonGroup__atx"><button type="button" aria-label="Copy code to clipboard" title="Copy" class="clean-btn"><span class="copyButtonIcons_eSgA" aria-hidden="true"><svg class="copyButtonIcon_y97N" viewBox="0 0 24 24"><path d="M19,21H8V7H19M19,5H8A2,2 0 0,0 6,7V21A2,2 0 0,0 8,23H19A2,2 0 0,0 21,21V7A2,2 0 0,0 19,5M16,1H4A2,2 0 0,0 2,3V17H4V3H16V1Z"></path></svg><svg class="copyButtonSuccessIcon_LjdS" viewBox="0 0 24 24"><path 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