profcollectd: Remove local files once disabled

This saves storage space on users' devices if profcollect is no longer
enabled.

Test: manual
Bug: 207426233
Change-Id: I04f19ba7ddbf9d9f977bb40ac4bc74a09369350f
Merged-In: I04f19ba7ddbf9d9f977bb40ac4bc74a09369350f

1 files changed, 19 insertions, 0 deletions

diff --git a/profcollectd/libprofcollectd/config.rs b/profcollectd/libprofcollectd/config.rs
index ea1a67c8..902b5b5e 100644
--- a/profcollectd/libprofcollectd/config.rs
+++ b/profcollectd/libprofcollectd/config.rs
@@ -22,6 +22,7 @@ use macaddr::MacAddr6;
 use rand::Rng;
 use serde::{Deserialize, Serialize};
 use std::error::Error;
+use std::fs::{read_dir, remove_file};
 use std::path::Path;
 use std::str::FromStr;
 use std::time::Duration;
@@ -31,6 +32,7 @@ const PROFCOLLECT_NODE_ID_PROPERTY: &str = "persist.profcollectd.node_id";
 
 pub const REPORT_RETENTION_SECS: u64 = 14 * 24 * 60 * 60; // 14 days.
 
+// Static configs that cannot be changed.
 lazy_static! {
     pub static ref TRACE_OUTPUT_DIR: &'static Path = Path::new("/data/misc/profcollectd/trace/");
     pub static ref PROFILE_OUTPUT_DIR: &'static Path = Path::new("/data/misc/profcollectd/output/");
@@ -42,6 +44,7 @@ lazy_static! {
         Path::new("/data/misc/profcollectd/output/config.json");
 }
 
+/// Dynamic configs, stored in config.json.
 #[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
 pub struct Config {
     /// Version of config file scheme, always equals to 1.
@@ -144,3 +147,19 @@ fn generate_random_node_id() -> MacAddr6 {
     node_id[0] |= 0x1;
     MacAddr6::from(node_id)
 }
+
+pub fn clear_data() -> Result<()> {
+    fn remove_files(path: &Path) -> Result<()> {
+        read_dir(path)?
+            .filter_map(|e| e.ok())
+            .map(|e| e.path())
+            .filter(|e| e.is_file())
+            .try_for_each(remove_file)?;
+        Ok(())
+    }
+
+    remove_files(&TRACE_OUTPUT_DIR)?;
+    remove_files(&PROFILE_OUTPUT_DIR)?;
+    remove_files(&REPORT_OUTPUT_DIR)?;
+    Ok(())
+}