feat(ext/net): relevant errors for resolveDns (#12370)

3 files changed, 17 insertions, 4 deletions

diff --git a/cli/tests/testdata/resolve_dns.ts b/cli/tests/testdata/resolve_dns.ts
index d765e0536..e4a50f7dc 100644
--- a/cli/tests/testdata/resolve_dns.ts
+++ b/cli/tests/testdata/resolve_dns.ts
@@ -37,6 +37,6 @@ console.log(JSON.stringify(txt));
 
 try {
   await Deno.resolveDns("not-found-example.com", "A", nameServer);
-} catch (_e) {
-  console.log("Error thrown for not-found-example.com");
+} catch (e) {
+  console.log(`Error ${e.name} thrown for not-found-example.com`);
 }
diff --git a/cli/tests/testdata/resolve_dns.ts.out b/cli/tests/testdata/resolve_dns.ts.out
index 78381e6c6..8b378ce71 100644
--- a/cli/tests/testdata/resolve_dns.ts.out
+++ b/cli/tests/testdata/resolve_dns.ts.out
@@ -14,4 +14,4 @@ SRV
 [{"priority":0,"weight":100,"port":1234,"target":"srv.com."}]
 TXT
 [["foo","bar"]]
-Error thrown for not-found-example.com
+Error NotFound thrown for not-found-example.com
diff --git a/ext/net/ops.rs b/ext/net/ops.rs
index 7019a9b1f..43a562e0f 100644
--- a/ext/net/ops.rs
+++ b/ext/net/ops.rs
@@ -35,6 +35,7 @@ use trust_dns_proto::rr::record_type::RecordType;
 use trust_dns_resolver::config::NameServerConfigGroup;
 use trust_dns_resolver::config::ResolverConfig;
 use trust_dns_resolver::config::ResolverOpts;
+use trust_dns_resolver::error::ResolveErrorKind;
 use trust_dns_resolver::system_conf;
 use trust_dns_resolver::AsyncResolver;
 
@@ -630,7 +631,19 @@ where
   let results = resolver
     .lookup(query, record_type, Default::default())
     .await
-    .map_err(|e| generic_error(format!("{}", e)))?
+    .map_err(|e| {
+      let message = format!("{}", e);
+      match e.kind() {
+        ResolveErrorKind::NoRecordsFound { .. } => {
+          custom_error("NotFound", message)
+        }
+        ResolveErrorKind::Message("No connections available") => {
+          custom_error("NotConnected", message)
+        }
+        ResolveErrorKind::Timeout => custom_error("TimedOut", message),
+        _ => generic_error(message),
+      }
+    })?
     .iter()
     .filter_map(rdata_to_return_record(record_type))
     .collect();