handle GitHub repo not found

Author: tayloraswift

Sources/SwiftinitServer/Endpoints/Interactive/Swiftinit.PackageIndexEndpoint.swift

@@ -40,7 +40,12 @@ extension Swiftinit.PackageIndexEndpoint:RestrictedEndpoint
         }
 
         //  Discard the tags for now, we want them to get indexed by the crawler.
-        let repo:GitHub.Repo = (consume response).repo
+        guard
+        let repo:GitHub.Repo = response.repo
+        else
+        {
+            return .notFound("No such repo.")
+        }
 
         guard repo.owner.login.allSatisfy({ $0 != "." })
         else

Sources/SwiftinitServer/Plugins/GitHubPlugin.RepoMonitor.swift

@@ -1,6 +1,7 @@
 import BSON
 import GitHubAPI
 import GitHubClient
+import HTTPServer
 import MongoDB
 import SemanticVersions
 import UnidocDB
@@ -109,9 +110,17 @@ extension GitHubPlugin.RepoMonitor:GitHubCrawler
                     ordering: .relaxed)
             }
 
-            package.repo = try .github(response.repo)
             package.crawled = now
 
+            if  let repo:GitHub.Repo = response.repo
+            {
+                package.repo = try .github(repo)
+            }
+            else
+            {
+                Log[.warning] = "(crawler) returned null for repo '\(package.symbol)'"
+            }
+
             switch try await server.db.packages.update(metadata: package, with: session)
             {
             case nil:

Sources/SwiftinitServer/Plugins/GitHubPlugin.RepoMonitorResponse.swift

@@ -6,10 +6,10 @@ extension GitHubPlugin
     /// Models a GraphQL repo monitor response.
     struct RepoMonitorResponse
     {
-        var repo:GitHub.Repo
+        var repo:GitHub.Repo?
         var tags:[GitHub.Tag]
 
-        init(repo:GitHub.Repo, tags:[GitHub.Tag])
+        init(repo:GitHub.Repo?, tags:[GitHub.Tag])
         {
             self.repo = repo
             self.tags = tags
@@ -25,6 +25,12 @@ extension GitHubPlugin.RepoMonitorResponse:JSONObjectDecodable
 
     init(json:JSON.ObjectDecoder<CodingKey>) throws
     {
+        if  case .null = json[.repository].value ?? .null
+        {
+            self.init(repo: nil, tags: [])
+            return
+        }
+
         self = try json[.repository].decode(using: GitHub.RepoNode.CodingKey.self)
         {
             let node:GitHub.RepoNode = try .init(json: $0)