[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"academy-blogs-en-1-1-all-golang-the-series-ep-127-connection-management-circuit-breaker-all--*":3,"academy-blog-translations-qygavtm8i9jxwh2":74},{"data":4,"page":62,"perPage":62,"totalItems":62,"totalPages":62},[5],{"alt":6,"collectionId":7,"collectionName":8,"content":9,"cover_image":10,"cover_image_path":11,"created":12,"created_by":13,"expand":14,"id":68,"keywords":69,"locale":44,"published_at":70,"scheduled_at":13,"school_blog":66,"short_description":71,"slug":72,"status":64,"title":6,"updated":73,"updated_by":13,"views":67},"Golang The Series EP 127: Connection Management & Circuit Breaker Preventing Cascading Failures","sclblg987654321","school_blog_translations","\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Welcome back, fellow Gophers! In \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>EP 126\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, we learned how to build a \"Smart Immigration Gate\" to protect our systems from external attacks using Rate Limiting, ensuring our servers don't get crushed by massive traffic.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">However... external security alone isn't enough. Sometimes, the \"disease\" originates from within our own system—such as a microservice slowing down or a database hitting a bottleneck. If we don't manage connections properly, this failure can spread to other services like a domino effect, bringing down the entire system.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Today, we’ll learn how to install a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>\"Circuit Breaker\"\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> in our Go code to handle these internal failures gracefully.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>1. The Problem of Being \"Too Kind\": Cascading Failure\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Imagine a scenario where \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service A\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> needs to call \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service B\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Col style=\"margin-bottom:0;margin-top:0;padding-inline-start:48px;\">\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">If \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service B\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> becomes slow (High Latency), \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service A\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> has to wait.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">While \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service A\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> waits, its connections are held open.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">As more requests hit \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service A\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, system resources (Memory and Goroutines) are consumed until they are exhausted.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:decimal;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Finally, \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service A\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> crashes along with \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Service B\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, spreading the failure to \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Services C, D, E\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, and so on.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Fol>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">This is what we call \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Cascading Failure\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">. Proper connection management isn't just about \"waiting\"—it's about knowing when to \"cut\" the connection to save the rest of the system.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>2. Understanding the Circuit Breaker Pattern\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">This concept is inspired by the electrical circuit breaker in your home. When a short circuit occurs, the breaker \"trips\" to cut the circuit, preventing a fire. In software, our breaker has three main states:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cul style=\"margin-bottom:0;margin-top:0;padding-inline-start:48px;\">\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Closed (Normal State):\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Data flows normally. The breaker monitors the failure rate.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Open (Tripped State):\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Once the failure rate exceeds a set threshold, the breaker \"opens\" and immediately stops sending requests to the target service, returning an error instantly. This gives the target service time to \"recover\" without being further overwhelmed.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Half-Open (Testing State):\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> After a specific timeout, the breaker allows a small amount of traffic through to test if the service has recovered. If it succeeds, it returns to \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Closed\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">; if it fails again, it flips back to \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Open\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Ful>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>3. Connection Management in Go (The Foundation)\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Before implementing a Circuit Breaker, we must start with the basics: \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Connection Pooling\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> and \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Context Timeouts\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">. In Go, you should use \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">context.WithTimeout\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> every time you call an external service to prevent your Goroutines from hanging indefinitely:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">Go\nctx, cancel := context.WithTimeout(context.Background(), 2*time.Second)\ndefer cancel()\n\nreq, _ := http.NewRequestWithContext(ctx, \"GET\", \"http:\u002F\u002Funstable-service\u002Fapi\", nil)\n\u002F\u002F If the call takes longer than 2 seconds, the system cuts it off immediately.\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>4. Implementation: Using \u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>sony\u002Fgobreaker\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong> in Go\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">One of the most popular and stable libraries for this is \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">gobreaker\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> by Sony. Let’s look at how to wrap our HTTP client with a Circuit Breaker.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cpre>\u003Ccode class=\"language-plaintext\">Go\npackage main\n\nimport (\n\t\"fmt\"\n\t\"io\u002Fioutil\"\n\t\"net\u002Fhttp\"\n\t\"time\"\n\n\t\"github.com\u002Fsony\u002Fgobreaker\"\n)\n\nvar cb *gobreaker.CircuitBreaker\n\nfunc init() {\n\tsettings := gobreaker.Settings{\n\t\tName:        \"External-API-Service\",\n\t\tMaxRequests: 3,                \u002F\u002F Requests allowed during Half-Open state\n\t\tInterval:    5 * time.Second,  \u002F\u002F Time interval to clear statistics\n\t\tTimeout:     10 * time.Second, \u002F\u002F How long the breaker stays Open before trying Half-Open\n\t\tReadyToTrip: func(counts gobreaker.Counts) bool {\n\t\t\t\u002F\u002F Trip if there are at least 5 requests and the failure rate is >= 60%\n\t\t\tfailureRatio := float64(counts.TotalFailures) \u002F float64(counts.Requests)\n\t\t\treturn counts.Requests >= 5 && failureRatio >= 0.6\n\t\t},\n\t}\n\tcb = gobreaker.NewCircuitBreaker(settings)\n}\n\nfunc CallService() ([]byte, error) {\n\t\u002F\u002F Use cb.Execute to wrap the operation\n\tbody, err := cb.Execute(func() (interface{}, error) {\n\t\tresp, err := http.Get(\"http:\u002F\u002Fpotentially-failing-service.com\")\n\t\tif err != nil {\n\t\t\treturn nil, err\n\t\t}\n\t\tdefer resp.Body.Close()\n\n\t\tif resp.StatusCode >= 500 {\n\t\t\treturn nil, fmt.Errorf(\"server error: %d\", resp.StatusCode)\n\t\t}\n\n\t\treturn ioutil.ReadAll(resp.Body)\n\t})\n\n\tif err != nil {\n\t\treturn nil, err\n\t}\n\treturn body.([]byte), nil\n}\n\nfunc main() {\n\t\u002F\u002F Simulating multiple service calls\n\tfor i := 0; i < 20; i++ {\n\t\t_, err := CallService()\n\t\tif err != nil {\n\t\t\tfmt.Printf(\"Request %d: Error - %v\\n\", i, err)\n\t\t} else {\n\t\t\tfmt.Printf(\"Request %d: Success\\n\", i)\n\t\t}\n\t\ttime.Sleep(500 * time.Millisecond)\n\t}\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\u003Cp> \u003C\u002Fp>\u003Ch3 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Why does this code save your system?\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh3>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">When the target service fails, \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">counts.TotalFailures\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> increases until it hits your threshold. The breaker immediately switches to the \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Open\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> state. Every subsequent request calling \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">CallService()\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> will be rejected with the error \u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:#e9eef6;color:#444746;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">circuit breaker is open\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>without waiting for an HTTP timeout\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">, drastically reducing resource consumption.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>5. Fallback Strategies (Plan B when the \"Power\" is Out)\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">When the breaker trips, we shouldn't leave the user with a blank screen or a generic error. We need a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Fallback Mechanism\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">:\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cul style=\"margin-bottom:0;margin-top:0;padding-inline-start:48px;\">\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Return Cached Data:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Send the latest successful data stored in the cache instead.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Return Default Value:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Send a friendly message like \"This service is temporarily unavailable.\"\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003Cli style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;font-size:11pt;font-style:normal;font-variant:normal;font-weight:400;list-style-type:disc;text-decoration:none;vertical-align:baseline;white-space:pre;\" dir=\"ltr\" aria-level=\"1\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Queueing:\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Store the request in a Message Queue (e.g., RabbitMQ) to process it later when the system recovers.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fli>\u003C\u002Ful>\u003Cp style=\"line-height:1.38;margin-bottom:0pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Chr>\u003Cp> \u003C\u002Fp>\u003Ch2 style=\"line-height:1.38;margin-bottom:6pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Conclusion\u003C\u002Fstrong>\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fh2>\u003Cp> \u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\">\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">Managing connections and implementing a Circuit Breaker is an admission that \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>\"Failure is inevitable.\"\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Our job isn't to try and make systems 100% fail-proof, but to ensure that when a failure occurs, \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>it does not spread.\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> Designing a \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Resilient Architecture\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\"> with Go will give you peace of mind, even when third-party services are crumbling.\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp style=\"line-height:1.38;margin-bottom:12pt;margin-top:0pt;\" dir=\"ltr\"> \u003C\u002Fp>\u003Cp>\u003Cspan style=\"background-color:transparent;color:#1f1f1f;font-family:Arial,sans-serif;\">\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">In the next episode (\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>EP 128\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">), we’ll explore \u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">\u003Cstrong>Logging, Monitoring, and Observability\u003C\u002Fstrong>\u003C\u002Fspan>\u003Cspan style=\"font-style:normal;font-variant:normal;font-weight:400;text-decoration:none;vertical-align:baseline;white-space:pre-wrap;\">. After all, if we don't have \"eyes\" to see when the breaker trips, we'll never truly know how our system is performing!\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\u003Cp> \u003C\u002Fp>\u003Cdiv class=\"raw-html-embed\">\u003Cdiv style=\"margin:0 0 6px 0; font-weight:700;\">Read more:\u003C\u002Fdiv>\n\u003Cul style=\"list-style:none; padding:0; margin:0; line-height:1.4;\">\n  \u003Cli style=\"margin:0;\">\u003Ca href=\"\u002Fen\u002Fblogs\u002Fcategories\u002FGolang\" title=\"Golang The Series\">Golang The Series\u003C\u002Fa>\u003C\u002Fli>\n  \u003Cli style=\"margin:0;\">\u003Ca href=\"\u002Fen\u002Fblogs\u002Fcategories\u002FJS2GO\" title=\"JS2GO\">JS2GO\u003C\u002Fa>\u003C\u002Fli>\n  \u003Cli style=\"margin:0;\">\u003Ca href=\"\u002Fen\u002Fblogs\u002Fcategories\u002FTailwind%20CSS\" title=\"Tailwind CSS\">Tailwind CSS\u003C\u002Fa>\u003C\u002Fli>\n\u003C\u002Ful>\u003C\u002Fdiv>\u003Cp> \u003C\u002Fp>\u003Cdiv class=\"raw-html-embed\">\n  \u003Cp style=\"margin:0 0 6px 0;\">\u003Cstrong>Follow Us:\u003C\u002Fstrong>\u003C\u002Fp>\n  \u003Cul style=\"list-style:none; 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