introduce --download-only and --upload-only flags

README.md

@@ -42,6 +42,10 @@ Options:
           Force usage of IPv6
   -d, --disable-dynamic-max-payload-size
           Disables dynamically skipping tests with larger payload sizes if the tests for the previous payload size took longer than 5 seconds
+      --download-only
+          Test download speed only
+      --upload-only
+          Test upload speed only
   -h, --help
           Print help
   -V, --version

examples/simple_speedtest.rs

@@ -10,6 +10,8 @@ fn main() {
         ipv4: false,                       // don't force ipv4 usage
         ipv6: false,                       // don't force ipv6 usage
         verbose: false,
+        upload_only: false,
+        download_only: false,
         nr_tests: 5,
         nr_latency_tests: 20,
         max_payload_size: PayloadSize::M10,

src/lib.rs

@@ -72,6 +72,26 @@ pub struct SpeedTestCLIOptions {
     /// size took longer than 5 seconds
     #[arg(short, long)]
     pub disable_dynamic_max_payload_size: bool,
+
+    /// Test download speed only
+    #[arg(long, conflicts_with = "upload_only")]
+    pub download_only: bool,
+
+    /// Test upload speed only
+    #[arg(long, conflicts_with = "download_only")]
+    pub upload_only: bool,
+}
+
+impl SpeedTestCLIOptions {
+    /// Returns whether download tests should be performed
+    pub fn should_download(&self) -> bool {
+        self.download_only || !self.upload_only
+    }
+
+    /// Returns whether upload tests should be performed
+    pub fn should_upload(&self) -> bool {
+        self.upload_only || !self.download_only
+    }
 }
 
 fn parse_payload_size(input_string: &str) -> Result<PayloadSize, String> {

src/speedtest.rs

@@ -88,25 +88,33 @@ pub fn speed_test(client: Client, options: SpeedTestCLIOptions) -> Vec<Measureme
         println!("{metadata}");
     }
     run_latency_test(&client, options.nr_latency_tests, options.output_format);
-    let payload_sizes = PayloadSize::sizes_from_max(options.max_payload_size);
-    let mut measurements = run_tests(
-        &client,
-        test_download,
-        TestType::Download,
-        payload_sizes.clone(),
-        options.nr_tests,
-        options.output_format,
-        options.disable_dynamic_max_payload_size,
-    );
-    measurements.extend(run_tests(
-        &client,
-        test_upload,
-        TestType::Upload,
-        payload_sizes.clone(),
-        options.nr_tests,
-        options.output_format,
-        options.disable_dynamic_max_payload_size,
-    ));
+    let payload_sizes = PayloadSize::sizes_from_max(options.max_payload_size.clone());
+    let mut measurements = Vec::new();
+
+    if options.should_download() {
+        measurements.extend(run_tests(
+            &client,
+            test_download,
+            TestType::Download,
+            payload_sizes.clone(),
+            options.nr_tests,
+            options.output_format,
+            options.disable_dynamic_max_payload_size,
+        ));
+    }
+
+    if options.should_upload() {
+        measurements.extend(run_tests(
+            &client,
+            test_upload,
+            TestType::Upload,
+            payload_sizes.clone(),
+            options.nr_tests,
+            options.output_format,
+            options.disable_dynamic_max_payload_size,
+        ));
+    }
+
     log_measurements(
         &measurements,
         payload_sizes,