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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 Binder service implementation.
use anyhow::{anyhow, Context, Error, Result};
use binder::Result as BinderResult;
use binder::{SpIBinder, Status};
use profcollectd_aidl_interface::aidl::com::android::server::profcollect::IProfCollectd::IProfCollectd;
use profcollectd_aidl_interface::aidl::com::android::server::profcollect::IProviderStatusCallback::IProviderStatusCallback;
use std::ffi::CString;
use std::fs::{read_dir, read_to_string, remove_file, write};
use std::str::FromStr;
use std::sync::{Mutex, MutexGuard};
use std::time::Duration;
use crate::config::{
clear_data, Config, CONFIG_FILE, PROFILE_OUTPUT_DIR, REPORT_OUTPUT_DIR, REPORT_RETENTION_SECS,
};
use crate::report::{get_report_ts, pack_report};
use crate::scheduler::Scheduler;
pub fn err_to_binder_status(msg: Error) -> Status {
let msg = format!("{:#?}", msg);
let msg = CString::new(msg).expect("Failed to convert to CString");
Status::new_service_specific_error(1, Some(&msg))
}
pub struct ProfcollectdBinderService {
lock: Mutex<Lock>,
}
struct Lock {
config: Config,
scheduler: Scheduler,
}
impl binder::Interface for ProfcollectdBinderService {}
impl IProfCollectd for ProfcollectdBinderService {
fn schedule(&self) -> BinderResult<()> {
let lock = &mut *self.lock();
lock.scheduler
.schedule_periodic(&lock.config)
.context("Failed to schedule collection.")
.map_err(err_to_binder_status)
}
fn terminate(&self) -> BinderResult<()> {
self.lock()
.scheduler
.terminate_periodic()
.context("Failed to terminate collection.")
.map_err(err_to_binder_status)
}
fn trace_once(&self, tag: &str) -> BinderResult<()> {
let lock = &mut *self.lock();
lock.scheduler
.one_shot(&lock.config, tag)
.context("Failed to initiate an one-off trace.")
.map_err(err_to_binder_status)
}
fn process(&self) -> BinderResult<()> {
let lock = &mut *self.lock();
lock.scheduler
.process(&lock.config)
.context("Failed to process profiles.")
.map_err(err_to_binder_status)
}
fn report(&self) -> BinderResult<String> {
self.process()?;
let lock = &mut *self.lock();
pack_report(&PROFILE_OUTPUT_DIR, &REPORT_OUTPUT_DIR, &lock.config)
.context("Failed to create profile report.")
.map_err(err_to_binder_status)
}
fn get_supported_provider(&self) -> BinderResult<String> {
Ok(self.lock().scheduler.get_trace_provider_name().to_string())
}
fn registerProviderStatusCallback(
&self,
cb: &binder::Strong<(dyn IProviderStatusCallback)>,
) -> BinderResult<()> {
if self.lock().scheduler.is_provider_ready() {
if let Err(e) = cb.onProviderReady() {
log::error!("Failed to call ProviderStatusCallback {:?}", e);
}
return Ok(());
}
let cb_binder: SpIBinder = cb.as_binder();
self.lock().scheduler.register_provider_ready_callback(Box::new(move || {
if let Ok(cb) = cb_binder.into_interface::<dyn IProviderStatusCallback>() {
if let Err(e) = cb.onProviderReady() {
log::error!("Failed to call ProviderStatusCallback {:?}", e)
}
} else {
log::error!("SpIBinder is not a IProviderStatusCallback.");
}
}));
Ok(())
}
}
impl ProfcollectdBinderService {
pub fn new() -> Result<Self> {
let new_scheduler = Scheduler::new()?;
let new_config = Config::from_env()?;
let config_changed = read_to_string(*CONFIG_FILE)
.ok()
.and_then(|s| Config::from_str(&s).ok())
.filter(|c| new_config == *c)
.is_none();
if config_changed {
log::info!("Config change detected, resetting profcollect.");
clear_data()?;
write(*CONFIG_FILE, &new_config.to_string())?;
}
// Clear profile reports out of rentention period.
for report in read_dir(*REPORT_OUTPUT_DIR)? {
let report = report?.path();
let report_name = report
.file_stem()
.and_then(|f| f.to_str())
.ok_or_else(|| anyhow!("Malformed path {}", report.display()))?;
let report_ts = get_report_ts(report_name);
if let Err(e) = report_ts {
log::error!(
"Cannot decode creation timestamp for report {}, caused by {}, deleting",
report_name,
e
);
remove_file(report)?;
continue;
}
let report_age = report_ts.unwrap().elapsed()?;
if report_age > Duration::from_secs(REPORT_RETENTION_SECS) {
log::info!("Report {} past rentention period, deleting", report_name);
remove_file(report)?;
}
}
Ok(ProfcollectdBinderService {
lock: Mutex::new(Lock { scheduler: new_scheduler, config: new_config }),
})
}
fn lock(&self) -> MutexGuard<Lock> {
self.lock.lock().unwrap()
}
}
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