Offline mode (#403)

* offline mode

* fixes, mixpanels, etc

* changes

* prettier

* rev

* actions

theseus/src/util/fetch.rs

@@ -7,7 +7,7 @@ use reqwest::Method;
 use serde::de::DeserializeOwned;
 use std::ffi::OsStr;
 use std::path::{Path, PathBuf};
-use std::time;
+use std::time::{self, Duration};
 use tokio::sync::{RwLock, Semaphore};
 use tokio::{fs::File, io::AsyncWriteExt};
 
@@ -182,6 +182,16 @@ pub async fn fetch_mirrors(
     unreachable!()
 }
 
+/// Using labrinth API, checks if an internet response can be found, with a timeout in seconds
+#[tracing::instrument(skip(semaphore))]
+#[theseus_macros::debug_pin]
+pub async fn check_internet(semaphore: &FetchSemaphore, timeout: u64) -> bool {
+    let result = fetch("https://api.modrinth.com", None, semaphore);
+    let result =
+        tokio::time::timeout(Duration::from_secs(timeout), result).await;
+    matches!(result, Ok(Ok(_)))
+}
+
 pub async fn read_json<T>(
     path: &Path,
     semaphore: &IoSemaphore,