refactor(go): separate getSourcePurl

lib/datasource/go.js

@@ -5,9 +5,7 @@ module.exports = {
   getPkgReleases,
 };
 
-async function getPkgReleases(purl, config) {
-  const { fullname: name } = purl;
-  logger.trace(`go.getPkgReleases(${name})`);
+async function getSourcePurl(name) {
   const pkgUrl = 'https://' + name + '?go-get=1';
   try {
     const res = (await got(pkgUrl, {
@@ -18,7 +16,7 @@ async function getPkgReleases(purl, config) {
     );
     if (sourceMatch) {
       const [, sourceUrl] = sourceMatch;
-      logger.debug({ name, sourceUrl }, 'Go lookup sourceUrl');
+      logger.debug({ depName: name, sourceUrl }, 'Go lookup sourceUrl');
       if (sourceUrl && sourceUrl.startsWith('https://github.com/')) {
         const githubPurl = {
           fullname: sourceUrl
@@ -26,10 +24,8 @@ async function getPkgReleases(purl, config) {
             .replace(/\/$/, ''),
           qualifiers: {},
         };
-        const githubTags = await github.getPkgReleases(githubPurl, config);
-        return githubTags;
+        return githubPurl;
       }
-      logger.info('Unknown go source: ' + sourceUrl);
     } else {
       logger.trace({ depName: name }, 'No go-source header found');
     }
@@ -46,3 +42,14 @@ async function getPkgReleases(purl, config) {
     return null;
   }
 }
+
+async function getPkgReleases(purl, config) {
+  const { fullname: name } = purl;
+  logger.trace(`go.getPkgReleases(${name})`);
+  const githubPurl = await getSourcePurl(name);
+  if (githubPurl) {
+    const githubTags = await github.getPkgReleases(githubPurl, config);
+    return githubTags;
+  }
+  return null;
+}