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//
// Copyright (C) 2021 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//! ProfCollect configurations.
use anyhow::Result;
use lazy_static::lazy_static;
use macaddr::MacAddr6;
use rand::Rng;
use serde::{Deserialize, Serialize};
use std::error::Error;
use std::path::Path;
use std::str::FromStr;
use std::time::Duration;
const PROFCOLLECT_CONFIG_NAMESPACE: &str = "profcollect_native_boot";
const PROFCOLLECT_NODE_ID_PROPERTY: &str = "persist.profcollectd.node_id";
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/");
pub static ref REPORT_OUTPUT_DIR: &'static Path = Path::new("/data/misc/profcollectd/report/");
pub static ref BETTERBUG_CACHE_DIR_PREFIX: &'static Path = Path::new("/data/user/");
pub static ref BETTERBUG_CACHE_DIR_SUFFIX: &'static Path =
Path::new("com.google.android.apps.internal.betterbug/cache/");
pub static ref CONFIG_FILE: &'static Path =
Path::new("/data/misc/profcollectd/output/config.json");
}
#[derive(Clone, PartialEq, Eq, Serialize, Deserialize, Debug)]
pub struct Config {
/// Version of config file scheme, always equals to 1.
version: u32,
/// Application specific node ID.
pub node_id: MacAddr6,
/// Device build fingerprint.
pub build_fingerprint: String,
/// Interval between collections.
pub collection_interval: Duration,
/// Length of time each collection lasts for.
pub sampling_period: Duration,
/// An optional filter to limit which binaries to or not to profile.
pub binary_filter: String,
}
impl Config {
pub fn from_env() -> Result<Self> {
Ok(Config {
version: 1,
node_id: get_or_initialise_node_id()?,
build_fingerprint: get_build_fingerprint()?,
collection_interval: Duration::from_secs(get_device_config(
"collection_interval",
600,
)?),
sampling_period: Duration::from_millis(get_device_config("sampling_period", 500)?),
binary_filter: get_device_config("binary_filter", "".to_string())?,
})
}
}
impl ToString for Config {
fn to_string(&self) -> String {
serde_json::to_string(self).expect("Failed to deserialise configuration.")
}
}
impl FromStr for Config {
type Err = serde_json::Error;
fn from_str(s: &str) -> Result<Self, Self::Err> {
serde_json::from_str::<Config>(s)
}
}
fn get_or_initialise_node_id() -> Result<MacAddr6> {
let mut node_id = get_property(&PROFCOLLECT_NODE_ID_PROPERTY, MacAddr6::nil())?;
if node_id.is_nil() {
node_id = generate_random_node_id();
set_property(&PROFCOLLECT_NODE_ID_PROPERTY, node_id);
}
Ok(node_id)
}
fn get_build_fingerprint() -> Result<String> {
get_property("ro.build.fingerprint", "unknown".to_string())
}
fn get_device_config<T>(key: &str, default_value: T) -> Result<T>
where
T: FromStr + ToString,
T::Err: Error + Send + Sync + 'static,
{
let default_value = default_value.to_string();
let config = profcollect_libflags_rust::get_server_configurable_flag(
&PROFCOLLECT_CONFIG_NAMESPACE,
&key,
&default_value,
);
Ok(T::from_str(&config)?)
}
fn get_property<T>(key: &str, default_value: T) -> Result<T>
where
T: FromStr + ToString,
T::Err: Error + Send + Sync + 'static,
{
let default_value = default_value.to_string();
let value = profcollect_libbase_rust::GetProperty(&key, &default_value);
Ok(T::from_str(&value)?)
}
fn set_property<T>(key: &str, value: T)
where
T: ToString,
{
let value = value.to_string();
profcollect_libbase_rust::SetProperty(&key, &value);
}
fn generate_random_node_id() -> MacAddr6 {
let mut node_id = rand::thread_rng().gen::<[u8; 6]>();
node_id[0] |= 0x1;
MacAddr6::from(node_id)
}
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