{"id":107559,"date":"2025-05-04T22:10:11","date_gmt":"2025-05-04T17:40:11","guid":{"rendered":"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/"},"modified":"2025-05-04T22:10:11","modified_gmt":"2025-05-04T17:40:11","slug":"use-launchdarklyld-with-golang-21ig","status":"publish","type":"post","link":"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/","title":{"rendered":"\u0627\u0632 LaunchDarkly (LD) \u0628\u0627 Golang &#8211; Dev Community \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f"},"content":{"rendered":"<div data-article-id=\"1946501\" id=\"article-body\">\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_81 counter-hierarchy ez-toc-counter-rtl ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0641\u0647\u0631\u0633\u062a \u0645\u0637\u0627\u0644\u0628<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/#%D9%85%D9%82%D8%AF%D9%85%D9%87\" >\u0645\u0642\u062f\u0645\u0647<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/#LaunchDarkly_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\" >LaunchDarkly \u0686\u06cc\u0633\u062a\u061f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/#%D9%86%D8%AD%D9%88%D9%87_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_LaunchDarkly\" >\u0646\u062d\u0648\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 LaunchDarkly<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/#%D9%85%D8%AB%D8%A7%D9%84_%DA%A9%D8%AF_%D8%A8%D8%A7_Golang\" >\u0645\u062b\u0627\u0644 \u06a9\u062f \u0628\u0627 Golang<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/nabfollower.com\/blog\/use-launchdarklyld-with-golang-21ig\/#%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\" >\u067e\u0627\u06cc\u0627\u0646<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D9%82%D8%AF%D9%85%D9%87\"><\/span>\n<p>  \u0645\u0642\u062f\u0645\u0647<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u062a\u0648\u0633\u0639\u0647 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631 \u0645\u062f\u0631\u0646 \u060c \u067e\u0631\u0686\u0645 \u06af\u0630\u0627\u0631\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627 \u0628\u0647 \u06cc\u06a9 \u062a\u06a9\u0646\u06cc\u06a9 \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0641\u0631\u0622\u06cc\u0646\u062f \u0627\u0646\u062a\u0634\u0627\u0631 \u060c \u0628\u0647\u0628\u0648\u062f \u0627\u06cc\u0645\u0646\u06cc \u0627\u0633\u062a\u0642\u0631\u0627\u0631 \u0648 \u0627\u0645\u06a9\u0627\u0646 \u062a\u062d\u0648\u06cc\u0644 \u0645\u062f\u0627\u0648\u0645 \u062a\u0628\u062f\u06cc\u0644 \u0634\u062f\u0647 \u0627\u0633\u062a. LaunchDarkly \u06cc\u06a9 \u0628\u0633\u062a\u0631 \u0645\u062d\u0628\u0648\u0628 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0648\u06cc\u0698\u06af\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u062a\u06cc\u0645 \u0647\u0627 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u062f\u06cc\u062f \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u062a\u0648\u0644\u06cc\u062f \u0631\u0627 \u06a9\u0646\u062a\u0631\u0644 \u06a9\u0646\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 \u0646\u062d\u0648\u0647 \u0627\u062f\u063a\u0627\u0645 LaunchDarkly \u0628\u0627 Golang (Go) \u060c \u0628\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u0628\u062f\u0648\u0646 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u062c\u062f\u062f \u0627\u0632 \u0628\u0631\u0646\u0627\u0645\u0647 \u062e\u0648\u062f \u060c \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u067e\u0648\u06cc\u0627 \u0631\u0627 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0647\u06cc\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"LaunchDarkly_%DA%86%DB%8C%D8%B3%D8%AA%D8%9F\"><\/span>\n<p>  LaunchDarkly \u0686\u06cc\u0633\u062a\u061f<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>LaunchDarkly \u06cc\u06a9 \u067e\u0644\u062a \u0641\u0631\u0645 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0648 \u0622\u0632\u0645\u0627\u06cc\u0634 \u0648\u06cc\u0698\u06af\u06cc \u0627\u0633\u062a \u06a9\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0631\u0627 \u0642\u0627\u062f\u0631 \u0645\u06cc \u0633\u0627\u0632\u062f \u062a\u0627 \u06a9\u062f \u0631\u0627 \u0645\u0633\u062a\u0642\u0631 \u06a9\u0646\u0646\u062f \u0627\u0645\u0627 \u06a9\u0646\u062a\u0631\u0644 \u06a9\u0627\u0631\u0628\u0631\u0627\u0646 \u0631\u0627 \u06a9\u0646\u062a\u0631\u0644 \u0645\u06cc \u06a9\u0646\u0646\u062f. \u0627\u06cc\u0646 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u062a\u06cc\u0645 \u0647\u0627:<\/p>\n<ul>\n<li>\u0628\u0647 \u062a\u062f\u0631\u06cc\u062c \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627 \u0631\u0627 \u0628\u0631\u0627\u06cc \u06a9\u0627\u0631\u0628\u0631\u0627\u0646 \u062c\u0645\u0639 \u06a9\u0646\u06cc\u062f.<\/li>\n<li>A\/B \u0646\u0633\u062e\u0647 \u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u06cc\u06a9 \u0648\u06cc\u0698\u06af\u06cc \u0631\u0627 \u062a\u0633\u062a \u06a9\u0646\u06cc\u062f.<\/li>\n<li>\u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0645\u0634\u06a9\u0644 \u0633\u0627\u0632 \u0631\u0627 \u0628\u062f\u0648\u0646 \u0628\u0627\u0632\u06af\u0634\u062a \u06a9\u0627\u0645\u0644 \u063a\u06cc\u0631\u0641\u0639\u0627\u0644 \u06a9\u0646\u06cc\u062f.<\/li>\n<li>\u0627\u0633\u062a\u0642\u0631\u0627\u0631 \u06a9\u062f \u062c\u062f\u0627\u06af\u0627\u0646\u0647 \u0627\u0632 \u0627\u0646\u062a\u0634\u0627\u0631 \u0648\u06cc\u0698\u06af\u06cc.<\/li>\n<\/ul>\n<p>LaunchDarkly \u0628\u0631\u0627\u06cc \u062f\u0633\u062a\u06cc\u0627\u0628\u06cc \u0628\u0647 \u0627\u06cc\u0646 \u0647\u062f\u0641 \u0627\u0632 \u067e\u0631\u0686\u0645 \u0647\u0627\u06cc \u0648\u06cc\u0698\u06af\u06cc (\u0647\u0645\u0686\u0646\u06cc\u0646 \u0628\u0647 \u0639\u0646\u0648\u0627\u0646 \u0636\u0627\u0645\u0646 \u0648\u06cc\u0698\u06af\u06cc \u0634\u0646\u0627\u062e\u062a\u0647 \u0645\u06cc \u0634\u0648\u062f) \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0645\u06cc \u06a9\u0646\u062f. \u067e\u0631\u0686\u0645 \u0647\u0627\u06cc \u0648\u06cc\u0698\u06af\u06cc \u062f\u0631 \u0627\u0635\u0644 \u062f\u0631 \u06a9\u062f \u0634\u0645\u0627 \u0634\u0631\u0637 \u0647\u0633\u062a\u0646\u062f \u06a9\u0647 \u062a\u0639\u06cc\u06cc\u0646 \u0645\u06cc \u06a9\u0646\u062f \u0622\u06cc\u0627 \u06cc\u06a9 \u0648\u06cc\u0698\u06af\u06cc \u0628\u0631\u0627\u06cc \u06cc\u06a9 \u06a9\u0627\u0631\u0628\u0631 \u06cc\u0627 \u0632\u0645\u06cc\u0646\u0647 \u062e\u0627\u0635 \u0641\u0639\u0627\u0644 \u0634\u062f\u0647 \u0627\u0633\u062a.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%86%D8%AD%D9%88%D9%87_%D8%A7%D8%B3%D8%AA%D9%81%D8%A7%D8%AF%D9%87_%D8%A7%D8%B2_LaunchDarkly\"><\/span>\n<p>  \u0646\u062d\u0648\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 LaunchDarkly<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0628\u0631\u0627\u06cc \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 LaunchDarkly \u062f\u0631 \u0628\u0631\u0646\u0627\u0645\u0647 \u062e\u0648\u062f:<\/p>\n<ul>\n<li>\n<p>\u06cc\u06a9 \u062d\u0633\u0627\u0628 LaunchDarkly \u0627\u06cc\u062c\u0627\u062f \u06a9\u0646\u06cc\u062f \u0648 \u06cc\u06a9 \u067e\u0631\u0648\u0698\u0647 \u0648 \u0645\u062d\u06cc\u0637 \u062c\u062f\u06cc\u062f \u062a\u0646\u0638\u06cc\u0645 \u06a9\u0646\u06cc\u062f. https:\/\/app.launchdarkly.com\/<\/p>\n<\/li>\n<li>\n<p>\u067e\u0631\u0686\u0645 \u0647\u0627\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0631\u0627 \u062f\u0631 \u062f\u0627\u0634\u0628\u0648\u0631\u062f LD \u062a\u0639\u0631\u06cc\u0641 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/li>\n<li>\n<p>LD SDK \u0631\u0627 \u062f\u0631 \u06a9\u062f \u0628\u0631\u0646\u0627\u0645\u0647 \u062e\u0648\u062f \u0627\u062f\u063a\u0627\u0645 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/li>\n<li>\n<p>\u067e\u0631\u0686\u0645 \u0647\u0627\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0631\u0627 \u062f\u0631 \u0632\u0645\u0627\u0646 \u0627\u062c\u0631\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u06a9\u0646\u06cc\u062f \u0648 \u0627\u0632 \u0645\u0642\u0627\u062f\u06cc\u0631 \u0622\u0646\u0647\u0627 \u0628\u0631\u0627\u06cc \u06a9\u0646\u062a\u0631\u0644 \u0645\u0646\u0637\u0642 \u0628\u0631\u0646\u0627\u0645\u0647 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u06a9\u0646\u06cc\u062f.<\/p>\n<\/li>\n<\/ul>\n<p><\/p>\n<hr\/>\n<p><strong>\u067e\u0631\u0686\u0645 \u0646\u0645\u0648\u0646\u0647 \u0645\u0646 &#8211;<\/strong><br \/><img decoding=\"async\" src=\"https:\/\/media2.dev.to\/dynamic\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fek3ekonsrkun1ttk7y63.png\" alt=\"\u067e\u0631\u0686\u0645 \u0646\u0645\u0648\u0646\u0647 \u0645\u0646 \u0628\u0631\u0627\u06cc LD\" loading=\"lazy\" width=\"800\" height=\"551\" title=\"\"><\/p>\n<hr\/>\n<p><strong>\u062a\u063a\u06cc\u06cc\u0631\u0627\u062a \u067e\u0631\u0686\u0645 \u0646\u0645\u0648\u0646\u0647 &#8211;<\/strong> <br \/><img decoding=\"async\" src=\"https:\/\/media2.dev.to\/dynamic\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Frtjqa19o3lz8mobdizl1.png\" alt=\"\u0646\u0645\u0648\u0646\u0647 \u062a\u063a\u06cc\u06cc\u0631\u0627\u062a \u067e\u0631\u0686\u0645 \u062f\u0631 LD\" loading=\"lazy\" width=\"800\" height=\"556\" title=\"\"><\/p>\n<p>LaunchDarkly SDK \u0631\u0627 \u0628\u0631\u0627\u06cc \u0632\u0628\u0627\u0646\u0647\u0627\u06cc \u0645\u062e\u062a\u0644\u0641 \u0627\u0632 \u062c\u0645\u0644\u0647 GO \u0641\u0631\u0627\u0647\u0645 \u0645\u06cc \u06a9\u0646\u062f \u06a9\u0647 \u0628\u0647 \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u0627\u062c\u0627\u0632\u0647 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u0628\u0627 \u0633\u0631\u0648\u06cc\u0633 LD \u062f\u0631 \u062a\u0639\u0627\u0645\u0644 \u0628\u0627\u0634\u062f \u0648 \u067e\u0631\u0686\u0645 \u0647\u0627 \u0631\u0627 \u0627\u0631\u0632\u06cc\u0627\u0628\u06cc \u06a9\u0646\u062f.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"%D9%85%D8%AB%D8%A7%D9%84_%DA%A9%D8%AF_%D8%A8%D8%A7_Golang\"><\/span>\n<p>  \u0645\u062b\u0627\u0644 \u06a9\u062f \u0628\u0627 Golang<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u06cc\u06a9 \u0645\u062b\u0627\u0644 \u0633\u0627\u062f\u0647 \u0627\u0632 \u0646\u062d\u0648\u0647 \u0627\u062f\u063a\u0627\u0645 \u0648 \u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 LaunchDarkly \u062f\u0631 \u06cc\u06a9 \u0628\u0631\u0646\u0627\u0645\u0647 GO \u0648\u062c\u0648\u062f \u062f\u0627\u0631\u062f:<\/p>\n<p><strong>\u0645\u0631\u062d\u0644\u0647 1: SDK \u0631\u0627 \u0646\u0635\u0628 \u06a9\u0646\u06cc\u062f<\/strong><\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight shell\"><code>go get <span class=\"s2\">\"github.com\/launchdarkly\/go-server-sdk\/v7\"<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p><strong>\u0645\u0631\u062d\u0644\u0647 2: \u0645\u062b\u0627\u0644 \u06a9\u062f<\/strong><br \/>\u062f\u0631 \u0627\u06cc\u0646\u062c\u0627 \u0645\u0627 \u0645\u062b\u0627\u0644\u06cc \u0628\u0631\u0627\u06cc \u067e\u0631\u0686\u0645 JSON \u062f\u0627\u0631\u06cc\u0645 \u0648 \u0647\u0645\u0686\u0646\u06cc\u0646 Watcher \u0631\u0627 \u0631\u0648\u06cc \u0622\u0646 \u067e\u0631\u0686\u0645 \u0627\u0636\u0627\u0641\u0647 \u0645\u06cc \u06a9\u0646\u06cc\u0645.<\/p>\n<div class=\"highlight js-code-highlight\">\n<pre class=\"highlight go\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\n\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\n    <span class=\"s\">\"log\"<\/span>\n    <span class=\"s\">\"os\"<\/span>\n    <span class=\"s\">\"os\/signal\"<\/span>\n    <span class=\"s\">\"syscall\"<\/span>\n    <span class=\"s\">\"time\"<\/span>\n    <span class=\"s\">\"github.com\/launchdarkly\/go-sdk-common\/v3\/ldcontext\"<\/span>\n    <span class=\"s\">\"github.com\/launchdarkly\/go-sdk-common\/v3\/ldvalue\"<\/span>\n    <span class=\"n\">ld<\/span> <span class=\"s\">\"github.com\/launchdarkly\/go-server-sdk\/v7\"<\/span>\n<span class=\"p\">)<\/span>\n\n<span class=\"c\">\/\/ Replace with your actual LaunchDarkly SDK key<\/span>\n<span class=\"k\">const<\/span> <span class=\"n\">sdkKey<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"YOUR-SDK-KEY\"<\/span>\n\n<span class=\"c\">\/\/ Replace with the key of the JSON flag you want to evaluate<\/span>\n<span class=\"k\">const<\/span> <span class=\"n\">jsonFlagKey<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"json-flag\"<\/span>\n\n\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n    <span class=\"c\">\/\/ --- 1. Configure and Initialize the LaunchDarkly Client (v7) ---<\/span>\n\n    <span class=\"c\">\/\/ Optional: for advanced configuration like logging<\/span>\n    <span class=\"c\">\/\/ config := ld.Config{} \/\/ Default configuration<\/span>\n    <span class=\"c\">\/\/ client, err := ld.MakeCustomClient(sdkKey, config, 5*time.Second)<\/span>\n\n    <span class=\"c\">\/\/ Creating client with Default configuration<\/span>\n    <span class=\"n\">client<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">ld<\/span><span class=\"o\">.<\/span><span class=\"n\">MakeClient<\/span><span class=\"p\">(<\/span><span class=\"n\">sdkKey<\/span><span class=\"p\">,<\/span> <span class=\"m\">5<\/span><span class=\"o\">*<\/span><span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Second<\/span><span class=\"p\">)<\/span>\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Fatalf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Error initializing LaunchDarkly client: %v\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\n    <span class=\"p\">}<\/span>\n    <span class=\"k\">defer<\/span> <span class=\"k\">func<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n        <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">Close<\/span><span class=\"p\">();<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\n            <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Error closing LaunchDarkly client: %v\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\n        <span class=\"p\">}<\/span>\n    <span class=\"p\">}()<\/span>\n\n    <span class=\"k\">if<\/span> <span class=\"o\">!<\/span><span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">Initialized<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Client did not initialize successfully within the timeout.\"<\/span><span class=\"p\">)<\/span>\n    <span class=\"p\">}<\/span> <span class=\"k\">else<\/span> <span class=\"p\">{<\/span>\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"LaunchDarkly client initialized successfully.\"<\/span><span class=\"p\">)<\/span>\n    <span class=\"p\">}<\/span>\n\n    <span class=\"c\">\/\/ --- 2. Define the Evaluation Context (v7 uses ldcontext from common v3) ---<\/span>\n    <span class=\"n\">evaluationContext<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">ldcontext<\/span><span class=\"o\">.<\/span><span class=\"n\">New<\/span><span class=\"p\">(<\/span><span class=\"s\">\"example-context-key\"<\/span><span class=\"p\">)<\/span>\n    <span class=\"c\">\/\/ Add more attributes as needed:<\/span>\n    <span class=\"c\">\/\/ evaluationContext = ldcontext.NewBuilder(\"example-user-key\").<\/span>\n    <span class=\"c\">\/\/  Kind(\"user\").<\/span>\n    <span class=\"c\">\/\/  Name(\"Example User\").<\/span>\n    <span class=\"c\">\/\/  SetString(\"email\", \"user@example.com\").<\/span>\n    <span class=\"c\">\/\/  Build()<\/span>\n\n    <span class=\"c\">\/\/ --- 3. Read the Initial JSON Flag Value (v7 uses ldvalue from common v3) ---<\/span>\n    <span class=\"n\">defaultValue<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">ldvalue<\/span><span class=\"o\">.<\/span><span class=\"n\">ObjectBuild<\/span><span class=\"p\">()<\/span><span class=\"o\">.<\/span><span class=\"n\">Build<\/span><span class=\"p\">()<\/span>\n    <span class=\"n\">jsonValue<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">JSONVariation<\/span><span class=\"p\">(<\/span><span class=\"n\">jsonFlagKey<\/span><span class=\"p\">,<\/span> <span class=\"n\">evaluationContext<\/span><span class=\"p\">,<\/span> <span class=\"n\">defaultValue<\/span><span class=\"p\">)<\/span>\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\n        <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Error evaluating flag '%s': %v. Using default value.\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">jsonFlagKey<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span><span class=\"p\">)<\/span>\n    <span class=\"p\">}<\/span>\n    <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Initial value for flag '%s': %s<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">jsonFlagKey<\/span><span class=\"p\">,<\/span> <span class=\"n\">jsonValue<\/span><span class=\"o\">.<\/span><span class=\"n\">JSONString<\/span><span class=\"p\">())<\/span>\n\n    <span class=\"c\">\/\/ --- 4. Watch for Flag Changes (v7 Flag Tracker with Listener Function) ---<\/span>\n    <span class=\"n\">WatchFlagChanges<\/span><span class=\"p\">(<\/span><span class=\"n\">client<\/span><span class=\"p\">,<\/span> <span class=\"n\">jsonFlagKey<\/span><span class=\"p\">,<\/span> <span class=\"n\">evaluationContext<\/span><span class=\"p\">)<\/span>\n\n    <span class=\"c\">\/\/ --- 5. Keep the Application Running ---<\/span>\n    <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Application started. Watching for flag changes. Press Ctrl+C to exit.\"<\/span><span class=\"p\">)<\/span>\n\n    <span class=\"c\">\/\/ Wait for a termination signal (Ctrl+C)<\/span>\n    <span class=\"n\">quit<\/span> <span class=\"o\">:=<\/span> <span class=\"nb\">make<\/span><span class=\"p\">(<\/span><span class=\"k\">chan<\/span> <span class=\"n\">os<\/span><span class=\"o\">.<\/span><span class=\"n\">Signal<\/span><span class=\"p\">,<\/span> <span class=\"m\">1<\/span><span class=\"p\">)<\/span>\n    <span class=\"n\">signal<\/span><span class=\"o\">.<\/span><span class=\"n\">Notify<\/span><span class=\"p\">(<\/span><span class=\"n\">quit<\/span><span class=\"p\">,<\/span> <span class=\"n\">syscall<\/span><span class=\"o\">.<\/span><span class=\"n\">SIGINT<\/span><span class=\"p\">,<\/span> <span class=\"n\">syscall<\/span><span class=\"o\">.<\/span><span class=\"n\">SIGTERM<\/span><span class=\"p\">)<\/span>\n    <span class=\"o\">&lt;-<\/span><span class=\"n\">quit<\/span>\n\n<span class=\"p\">}<\/span>\n\n<span class=\"k\">func<\/span> <span class=\"n\">WatchFlagChanges<\/span><span class=\"p\">(<\/span><span class=\"n\">client<\/span> <span class=\"o\">*<\/span><span class=\"n\">ld<\/span><span class=\"o\">.<\/span><span class=\"n\">LDClient<\/span><span class=\"p\">,<\/span> <span class=\"n\">flagKey<\/span> <span class=\"kt\">string<\/span><span class=\"p\">,<\/span> <span class=\"n\">context<\/span> <span class=\"n\">ldcontext<\/span><span class=\"o\">.<\/span><span class=\"n\">Context<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\n    <span class=\"n\">updateCh<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">client<\/span><span class=\"o\">.<\/span><span class=\"n\">GetFlagTracker<\/span><span class=\"p\">()<\/span><span class=\"o\">.<\/span><span class=\"n\">AddFlagValueChangeListener<\/span><span class=\"p\">(<\/span><span class=\"n\">flagKey<\/span><span class=\"p\">,<\/span> <span class=\"n\">context<\/span><span class=\"p\">,<\/span> <span class=\"n\">ldvalue<\/span><span class=\"o\">.<\/span><span class=\"n\">Null<\/span><span class=\"p\">())<\/span>\n    <span class=\"k\">go<\/span> <span class=\"k\">func<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\n        <span class=\"k\">for<\/span> <span class=\"n\">event<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">updateCh<\/span> <span class=\"p\">{<\/span>\n            <span class=\"n\">log<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Flag %q for context %q has changed from %s to %s\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">event<\/span><span class=\"o\">.<\/span><span class=\"n\">Key<\/span><span class=\"p\">,<\/span>\n                <span class=\"n\">context<\/span><span class=\"o\">.<\/span><span class=\"n\">Key<\/span><span class=\"p\">(),<\/span> <span class=\"n\">event<\/span><span class=\"o\">.<\/span><span class=\"n\">OldValue<\/span><span class=\"p\">,<\/span> <span class=\"n\">event<\/span><span class=\"o\">.<\/span><span class=\"n\">NewValue<\/span><span class=\"p\">)<\/span>\n        <span class=\"p\">}<\/span>\n    <span class=\"p\">}()<\/span>\n<span class=\"p\">}<\/span>\n<\/code><\/pre>\n<div class=\"highlight__panel js-actions-panel\">\n<div class=\"highlight__panel-action js-fullscreen-code-action\">\n    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-on\"><title>\u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u0631\u0627 \u0648\u0627\u0631\u062f \u06a9\u0646\u06cc\u062f<\/title>\n    <path d=\"M16 3h6v6h-2V5h-4V3zM2 3h6v2H4v4H2V3zm18 16v-4h2v6h-6v-2h4zM4 19h4v2H2v-6h2v4z\"\/>\n<\/svg><\/p>\n<p>    <svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" class=\"highlight-action crayons-icon highlight-action--fullscreen-off\"><title>\u0627\u0632 \u062d\u0627\u0644\u062a \u062a\u0645\u0627\u0645 \u0635\u0641\u062d\u0647 \u062e\u0627\u0631\u062c \u0634\u0648\u06cc\u062f<\/title>\n    <path d=\"M18 7h4v2h-6V3h2v4zM8 9H2V7h4V3h2v6zm10 8v4h-2v-6h6v2h-4zM8 15v6H6v-4H2v-2h6z\"\/>\n<\/svg><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>\u062e\u0631\u0648\u062c\u06cc:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/media2.dev.to\/dynamic\/image\/width=800%2Cheight=%2Cfit=scale-down%2Cgravity=auto%2Cformat=auto\/https%3A%2F%2Fdev-to-uploads.s3.amazonaws.com%2Fuploads%2Farticles%2Fcpvg441gop0ip022kg2x.png\" alt=\"\u062e\u0631\u0648\u062c\u06cc \u0646\u0645\u0648\u0646\u0647 \u062a\u0627\u0631\u06cc\u06a9 \u0631\u0627 \u0631\u0627\u0647 \u0627\u0646\u062f\u0627\u0632\u06cc \u06a9\u0646\u06cc\u062f\" loading=\"lazy\" width=\"800\" height=\"125\" title=\"\"><\/p>\n<p>\u0628\u0631\u0627\u06cc \u062e\u0631\u0648\u062c\u06cc \u0628\u0627\u0644\u0627\u062a\u0631 \u060c \u0645\u06cc \u062a\u0648\u0627\u0646\u06cc\u0645 \u0628\u0628\u06cc\u0646\u06cc\u0645 \u06a9\u0647 \u0645\u0642\u062f\u0627\u0631 \u067e\u0631\u0686\u0645 \u0627\u0632 \u0622\u0646 \u062a\u063a\u06cc\u06cc\u0631 \u06a9\u0631\u062f <code>env:stage<\/code> \u0628\u0647 <code>env:prod<\/code> \u0628\u0639\u062f \u0627\u0632 \u0627\u06cc\u0646\u06a9\u0647 \u0647\u062f\u0641 \u0631\u0627 \u0628\u0631\u0627\u06cc \u067e\u0631\u0686\u0645 \u062a\u063a\u06cc\u06cc\u0631 \u062f\u0627\u062f\u0645.<\/p>\n<p>\u06cc\u0627\u062f\u062f\u0627\u0634\u062a \u0647\u0627:<\/p>\n<ul>\n<li>your_sdk_key \u062e\u0648\u062f \u0631\u0627 \u0628\u0627 \u06a9\u0644\u06cc\u062f SDK \u0645\u062d\u06cc\u0637 \u062e\u0648\u062f \u0627\u0632 LaunchDarkly \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u06a9\u0646\u06cc\u062f.<\/li>\n<li>&#8220;\u0648\u06cc\u0698\u06af\u06cc \u062c\u062f\u06cc\u062f&#8221; \u0631\u0627 \u0628\u0627 \u06a9\u0644\u06cc\u062f \u0648\u0627\u0642\u0639\u06cc \u067e\u0631\u0686\u0645 \u062a\u0639\u0631\u06cc\u0641 \u0634\u062f\u0647 \u062e\u0648\u062f \u062f\u0631 \u062f\u0627\u0634\u0628\u0648\u0631\u062f LD \u062c\u0627\u06cc\u06af\u0632\u06cc\u0646 \u06a9\u0646\u06cc\u062f.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"%D9%BE%D8%A7%DB%8C%D8%A7%D9%86\"><\/span>\n<p>  \u067e\u0627\u06cc\u0627\u0646<br \/>\n<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>\u0627\u0633\u062a\u0641\u0627\u062f\u0647 \u0627\u0632 LaunchDarkly \u0628\u0627 Golang \u0628\u0647 \u062a\u0648\u0633\u0639\u0647 \u062f\u0647\u0646\u062f\u06af\u0627\u0646 \u0627\u06cc\u0646 \u0627\u0645\u06a9\u0627\u0646 \u0631\u0627 \u0645\u06cc \u062f\u0647\u062f \u062a\u0627 \u06a9\u0646\u062a\u0631\u0644 \u0631\u06cc\u0632 \u0648 \u062f\u0631\u0634\u062a \u0628\u0631 \u0631\u0648\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0631\u0627 \u0628\u062f\u0633\u062a \u0622\u0648\u0631\u0646\u062f \u0648 \u0631\u0648\u0646\u062f 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LaunchDarkly \u0641\u0642\u0637 \u0628\u0627 \u0686\u0646\u062f \u062e\u0637 \u06a9\u062f \u060c \u06a9\u0646\u062a\u0631\u0644 \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0648 \u0648\u0627\u0642\u0639\u06cc \u0631\u0627 \u0628\u0631 \u0631\u0641\u062a\u0627\u0631 \u0628\u0631\u0646\u0627\u0645\u0647 \u0634\u0645\u0627 \u0627\u0645\u06a9\u0627\u0646 \u067e\u0630\u06cc\u0631 \u0645\u06cc \u06a9\u0646\u062f.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>\u0645\u0642\u062f\u0645\u0647 \u062f\u0631 \u062a\u0648\u0633\u0639\u0647 \u0646\u0631\u0645 \u0627\u0641\u0632\u0627\u0631 \u0645\u062f\u0631\u0646 \u060c \u067e\u0631\u0686\u0645 \u06af\u0630\u0627\u0631\u06cc \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627 \u0628\u0647 \u06cc\u06a9 \u062a\u06a9\u0646\u06cc\u06a9 \u0642\u062f\u0631\u062a\u0645\u0646\u062f \u0628\u0631\u0627\u06cc \u0645\u062f\u06cc\u0631\u06cc\u062a \u0641\u0631\u0622\u06cc\u0646\u062f \u0627\u0646\u062a\u0634\u0627\u0631 \u060c \u0628\u0647\u0628\u0648\u062f \u0627\u06cc\u0645\u0646\u06cc \u0627\u0633\u062a\u0642\u0631\u0627\u0631 \u0648 \u0627\u0645\u06a9\u0627\u0646 \u062a\u062d\u0648\u06cc\u0644 \u0645\u062f\u0627\u0648\u0645 \u062a\u0628\u062f\u06cc\u0644 \u0634\u062f\u0647 \u0627\u0633\u062a. LaunchDarkly \u06cc\u06a9 \u0628\u0633\u062a\u0631 \u0645\u062d\u0628\u0648\u0628 \u0645\u062f\u06cc\u0631\u06cc\u062a \u0648\u06cc\u0698\u06af\u06cc \u0627\u0633\u062a \u06a9\u0647 \u0628\u0647 \u062a\u06cc\u0645 \u0647\u0627 \u06a9\u0645\u06a9 \u0645\u06cc \u06a9\u0646\u062f \u062a\u0627 \u062f\u06cc\u062f \u0648\u06cc\u0698\u06af\u06cc \u0647\u0627\u06cc \u062a\u0648\u0644\u06cc\u062f \u0631\u0627 \u06a9\u0646\u062a\u0631\u0644 \u06a9\u0646\u0646\u062f. \u062f\u0631 \u0627\u06cc\u0646 \u0645\u0642\u0627\u0644\u0647 &hellip;<\/p>\n","protected":false},"author":2,"featured_media":107560,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"fifu_image_url":"","fifu_image_alt":"","footnotes":""},"categories":[339],"tags":[],"class_list":["post-107559","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dev"],"_links":{"self":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/107559","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/comments?post=107559"}],"version-history":[{"count":0,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/posts\/107559\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media\/107560"}],"wp:attachment":[{"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/media?parent=107559"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/categories?post=107559"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/nabfollower.com\/blog\/wp-json\/wp\/v2\/tags?post=107559"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}