Add: Make Ganache Startup Timeout *Configurable*. (gakonst#1224)

* Add: Configurable Ganache Startup TImeout

* fix lint, add docs.

ethers-core/src/utils/ganache.rs

@@ -9,7 +9,7 @@ use std::{
     time::{Duration, Instant},
 };
 
-/// How long we will wait for ganache to indicate that it is ready.
+/// Default amount of time we will wait for ganache to indicate that it is ready.
 const GANACHE_STARTUP_TIMEOUT_MILLIS: u64 = 10_000;
 
 /// A ganache CLI instance. Will close the instance when dropped.
@@ -83,6 +83,7 @@ pub struct Ganache {
     mnemonic: Option<String>,
     fork: Option<String>,
     args: Vec<String>,
+    startup_timeout: Option<u64>,
 }
 
 impl Ganache {
@@ -92,6 +93,13 @@ impl Ganache {
         Self::default()
     }
 
+    /// Sets the startup timeout which will be used when the `ganache-cli` instance is launched in
+    /// miliseconds. 10_000 miliseconds by default).
+    pub fn startup_timeout_millis<T: Into<u64>>(mut self, timeout: T) -> Self {
+        self.startup_timeout = Some(timeout.into());
+        self
+    }
+
     /// Sets the port which will be used when the `ganache-cli` instance is launched.
     #[must_use]
     pub fn port<T: Into<u16>>(mut self, port: T) -> Self {
@@ -176,8 +184,11 @@ impl Ganache {
         let mut private_keys = Vec::new();
         let mut addresses = Vec::new();
         let mut is_private_key = false;
+
+        let startup_timeout =
+            Duration::from_millis(self.startup_timeout.unwrap_or(GANACHE_STARTUP_TIMEOUT_MILLIS));
         loop {
-            if start + Duration::from_millis(GANACHE_STARTUP_TIMEOUT_MILLIS) <= Instant::now() {
+            if start + startup_timeout <= Instant::now() {
                 panic!("Timed out waiting for ganache to start. Is ganache-cli installed?")
             }
 
@@ -205,3 +216,18 @@ impl Ganache {
         GanacheInstance { pid: child, private_keys, addresses, port }
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn configurable_startup_timeout() {
+        Ganache::new().startup_timeout_millis(100000_u64).spawn();
+    }
+
+    #[test]
+    fn default_startup_works() {
+        Ganache::new().spawn();
+    }
+}