test(pmonitor): add testnet integration

crates/bin/pmonitor/Cargo.toml

@@ -8,7 +8,8 @@ homepage = { workspace = true }
 license = { workspace = true }
 publish = false
 
-# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[features]
+integration-testnet = []
 
 [dependencies]
 anyhow = {workspace = true}

crates/bin/pmonitor/tests/testnet.rs

@@ -0,0 +1,119 @@
+#![cfg(feature = "integration-testnet")]
+//! Integration tests for pmonitor against the public Penumbra testnet.
+//! Mostly useful for verifying that HTTPS connections for gRPC
+//! are well supported.
+use anyhow::Result;
+use assert_cmd::Command as AssertCommand;
+use pcli::config::PcliConfig;
+
+use std::fs::File;
+use std::io::{BufWriter, Write};
+use std::path::{Path, PathBuf};
+use tempfile::{tempdir, NamedTempFile, TempDir};
+
+const NODE_URL: &str = "https://testnet.plinfra.net";
+
+/// Initialize a new pcli wallet at the target directory.
+/// Discards the generated seed phrase.
+fn pcli_init_softkms(pcli_home: &TempDir) -> Result<()> {
+    let mut cmd = AssertCommand::cargo_bin("pcli")?;
+    cmd.args([
+        "--home",
+        pcli_home
+            .path()
+            .to_str()
+            .expect("can convert wallet path to string"),
+        "init",
+        "--grpc-url",
+        NODE_URL,
+        "soft-kms",
+        "generate",
+    ])
+    // send empty string to accept the interstitial seed phrase display
+    .write_stdin("");
+    cmd.assert().success();
+    Ok(())
+}
+
+/// Retrieve a FullViewingKey from a pcli home dir.
+fn get_fvk_from_wallet_dir(pcli_home: &TempDir) -> Result<String> {
+    let pcli_config_path = pcli_home.path().join("config.toml");
+    let pcli_config = PcliConfig::load(
+        pcli_config_path
+            .to_str()
+            .expect("failed to convert pcli wallet path to str"),
+    )?;
+    Ok(pcli_config.full_viewing_key.to_string())
+}
+
+/// Given a list of FVKs, formatted as Strings, write a JSON file
+/// containing those FVKs, for use with pmonitor via the `--fvks` CLI flag.
+fn write_fvks_json(fvks: Vec<String>, dest_filepath: &File) -> Result<()> {
+    let mut w = BufWriter::new(dest_filepath);
+    serde_json::to_writer(&mut w, &fvks)?;
+    w.flush()?;
+    Ok(())
+}
+
+#[test]
+// Initialize an empty (i.e. random) wallet. We don't care about prior balances,
+// because we're not exercising misbehavior: all we care about is that pmonitor
+// can talk to an HTTPS endpoint and understand the blocks it pulls.
+pub fn pmonitor_passes_with_empty_wallet_on_testnet() -> Result<()> {
+    tracing_subscriber::fmt::try_init().ok();
+    let pcli_home = tempdir().unwrap();
+    pcli_init_softkms(&pcli_home)?;
+
+    let fvks = vec![get_fvk_from_wallet_dir(&pcli_home)?];
+    let fvks_json = NamedTempFile::new()?;
+    write_fvks_json(fvks, fvks_json.as_file())?;
+    let pmonitor_pardir = tempfile::tempdir()?;
+    let pmonitor_home = initialize_pmonitor(&pmonitor_pardir, fvks_json.path())?;
+
+    // Run `pmonitor audit` based on the pcli wallets and associated FVKs.
+    let cmd = AssertCommand::cargo_bin("pmonitor")?
+        .args([
+            "--home",
+            pmonitor_home
+                .as_path()
+                .to_str()
+                .expect("failed to parse pmonitor tempdir as directory"),
+            "audit",
+        ])
+        .ok();
+
+    if cmd.is_ok() {
+        Ok(())
+    } else {
+        anyhow::bail!("failed during 'pmonitor audit'")
+    }
+}
+
+/// Generate a config directory for `pmonitor`, based on input FVKs.
+fn initialize_pmonitor(tmpdir: &TempDir, fvks_json: &Path) -> anyhow::Result<PathBuf> {
+    // pmonitor doesn't like pre-existing homedirs so we'll nest this one.
+    let pmonitor_home = tmpdir.path().join("pmonitor");
+
+    let cmd = AssertCommand::cargo_bin("pmonitor")?
+        .args([
+            "--home",
+            pmonitor_home
+                .as_path()
+                .to_str()
+                .expect("failed to parse pmonitor tempdir as dir"),
+            "init",
+            "--grpc-url",
+            NODE_URL,
+            "--fvks",
+            fvks_json
+                .to_str()
+                .expect("failed to parse fvk json tempfile as filepath"),
+        ])
+        .output();
+
+    assert!(
+        cmd.unwrap().status.success(),
+        "failed to initialize pmonitor"
+    );
+    Ok(pmonitor_home)
+}