Import android_logger-0.8.6
Change-Id: Ib4e241a1fe892d4e5712014c1c3b89748f1b3e77
diff --git a/.cargo_vcs_info.json b/.cargo_vcs_info.json
new file mode 100644
index 0000000..be646cb
--- /dev/null
+++ b/.cargo_vcs_info.json
@@ -0,0 +1,5 @@
+{
+ "git": {
+ "sha1": "3e29144d9b6ef5bf50191bbae0b79affd910bb88"
+ }
+}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9c7143b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,3 @@
+target
+Cargo.lock
+/.idea
\ No newline at end of file
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..af70373
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,25 @@
+language: rust
+rust:
+ - stable
+ - beta
+ - nightly
+matrix:
+ allow_failures:
+ - rust: nightly
+os:
+ - linux
+ - osx
+
+before_script:
+ - rustup target add arm-linux-androideabi
+ - rustup target add armv7-linux-androideabi
+ - rustup target add aarch64-linux-android
+ - rustup target add i686-linux-android
+
+script:
+ - cargo check --target=arm-linux-androideabi
+ - cargo check --target=armv7-linux-androideabi
+ - cargo check --target=aarch64-linux-android
+ - cargo check --target=i686-linux-android
+ - cargo doc
+ - cargo test
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..ea060be
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,40 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies
+#
+# If you believe there's an error in this file please file an
+# issue against the rust-lang/cargo repository. If you're
+# editing this file be aware that the upstream Cargo.toml
+# will likely look very different (and much more reasonable)
+
+[package]
+name = "android_logger"
+version = "0.8.6"
+authors = ["The android_logger Developers"]
+description = "A logging implementation for `log` which hooks to android log output.\n"
+readme = "README.md"
+keywords = ["android", "bindings", "log", "logger"]
+categories = ["api-bindings"]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/Nercury/android_logger-rs"
+[dependencies.android_log-sys]
+version = "0.1"
+
+[dependencies.env_logger]
+version = "0.7"
+default-features = false
+
+[dependencies.lazy_static]
+version = "1.0"
+
+[dependencies.log]
+version = "0.4"
+
+[features]
+default = ["regex"]
+regex = ["env_logger/regex"]
+[badges.travis-ci]
+repository = "Nercury/android_logger-rs"
diff --git a/Cargo.toml.orig b/Cargo.toml.orig
new file mode 100644
index 0000000..753d7f2
--- /dev/null
+++ b/Cargo.toml.orig
@@ -0,0 +1,32 @@
+[package]
+name = "android_logger"
+version = "0.8.6"
+authors = ["The android_logger Developers"]
+license = "MIT OR Apache-2.0"
+readme = "README.md"
+repository = "https://github.com/Nercury/android_logger-rs"
+description = """
+A logging implementation for `log` which hooks to android log output.
+"""
+keywords = ["android", "bindings", "log", "logger"]
+categories = ["api-bindings"]
+
+[features]
+default = ["regex"]
+regex = ["env_logger/regex"]
+
+[dependencies]
+lazy_static = "1.0"
+
+[dependencies.log]
+version = "0.4"
+
+[dependencies.android_log-sys]
+version = "0.1"
+
+[dependencies.env_logger]
+version = "0.7"
+default-features = false
+
+[badges]
+travis-ci = { repository = "Nercury/android_logger-rs" }
diff --git a/LICENSE-APACHE b/LICENSE-APACHE
new file mode 100644
index 0000000..36b2b45
--- /dev/null
+++ b/LICENSE-APACHE
@@ -0,0 +1,201 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+APPENDIX: How to apply the Apache License to your work.
+
+To apply the Apache License to your work, attach the following
+boilerplate notice, with the fields enclosed by brackets "{}"
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+Copyright 2016 The android_logger Developers
+
+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.
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+limitations under the License.
diff --git a/LICENSE-MIT b/LICENSE-MIT
new file mode 100644
index 0000000..d73e145
--- /dev/null
+++ b/LICENSE-MIT
@@ -0,0 +1,19 @@
+Copyright (c) 2016 The android_logger Developers
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..43bac67
--- /dev/null
+++ b/README.md
@@ -0,0 +1,80 @@
+## Send Rust logs to Logcat
+
+[](https://crates.io/crates/android_logger)
+[](https://travis-ci.org/Nercury/android_logger-rs)
+
+This library is a drop-in replacement for `env_logger`. Instead, it outputs messages to
+android's logcat.
+
+This only works on Android and requires linking to `log` which
+is only available under android. With Cargo, it is possible to conditionally require
+this library:
+
+```toml
+[target.'cfg(target_os = "android")'.dependencies]
+android_logger = "0.8"
+```
+
+Example of initialization on activity creation, with log configuration:
+
+```rust
+#[macro_use] extern crate log;
+extern crate android_logger;
+
+use log::Level;
+use android_logger::{Config,FilterBuilder};
+
+fn native_activity_create() {
+ android_logger::init_once(
+ Config::default()
+ .with_min_level(Level::Trace) // limit log level
+ .with_tag("mytag") // logs will show under mytag tag
+ .with_filter( // configure messages for specific crate
+ FilterBuilder::new()
+ .parse("debug,hello::crate=error")
+ .build())
+ );
+
+ trace!("this is a verbose {}", "message");
+ error!("this is printed by default");
+}
+```
+
+To allow all logs, use the default configuration with min level Trace:
+
+```rust
+#[macro_use] extern crate log;
+extern crate android_logger;
+
+use log::Level;
+use android_logger::Config;
+
+fn native_activity_create() {
+ android_logger::init_once(
+ Config::default().with_min_level(Level::Trace));
+}
+```
+
+There is a caveat that this library can only be initialized once
+(hence the `init_once` function name). However, Android native activity can be
+re-created every time the screen is rotated, resulting in multiple initialization calls.
+Therefore this library will only log a warning for subsequent `init_once` calls.
+
+This library ensures that logged messages do not overflow Android log message limits
+by efficiently splitting messages into chunks.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.
diff --git a/src/lib.rs b/src/lib.rs
new file mode 100644
index 0000000..ade6b8a
--- /dev/null
+++ b/src/lib.rs
@@ -0,0 +1,408 @@
+// Copyright 2016 The android_logger Developers
+//
+// Licensed under the Apache License, Version 2.0, <LICENSE-APACHE or
+// http://apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or
+// http://opensource.org/licenses/MIT>, at your option. This file may not be
+// copied, modified, or distributed except according to those terms.
+
+//! A logger which writes to android output.
+//!
+//! ## Example
+//!
+//! ```
+//! #[macro_use] extern crate log;
+//! extern crate android_logger;
+//!
+//! use log::Level;
+//! use android_logger::Config;
+//!
+//! /// Android code may not have obvious "main", this is just an example.
+//! fn main() {
+//! android_logger::init_once(
+//! Config::default().with_min_level(Level::Trace),
+//! );
+//!
+//! debug!("this is a debug {}", "message");
+//! error!("this is printed by default");
+//! }
+//! ```
+//!
+//! ## Example with module path filter
+//!
+//! It is possible to limit log messages to output from a specific crate,
+//! and override the logcat tag name (by default, the crate name is used):
+//!
+//! ```
+//! #[macro_use] extern crate log;
+//! extern crate android_logger;
+//!
+//! use log::Level;
+//! use android_logger::{Config,FilterBuilder};
+//!
+//! fn main() {
+//! android_logger::init_once(
+//! Config::default()
+//! .with_min_level(Level::Trace)
+//! .with_tag("mytag")
+//! .with_filter(FilterBuilder::new().parse("debug,hello::crate=trace").build()),
+//! );
+//!
+//! // ..
+//! }
+//! ```
+
+#[cfg(target_os = "android")]
+extern crate android_log_sys as log_ffi;
+#[macro_use]
+extern crate lazy_static;
+#[macro_use]
+extern crate log;
+
+extern crate env_logger;
+
+use std::sync::RwLock;
+
+#[cfg(target_os = "android")]
+use log_ffi::LogPriority;
+use log::{Level, Log, Metadata, Record};
+use std::ffi::{CStr, CString};
+use std::mem;
+use std::fmt;
+use std::ptr;
+
+pub use env_logger::filter::{Filter, Builder as FilterBuilder};
+
+/// Output log to android system.
+#[cfg(target_os = "android")]
+fn android_log(prio: log_ffi::LogPriority, tag: &CStr, msg: &CStr) {
+ unsafe {
+ log_ffi::__android_log_write(
+ prio as log_ffi::c_int,
+ tag.as_ptr() as *const log_ffi::c_char,
+ msg.as_ptr() as *const log_ffi::c_char,
+ )
+ };
+}
+
+/// Dummy output placeholder for tests.
+#[cfg(not(target_os = "android"))]
+fn android_log(_priority: Level, _tag: &CStr, _msg: &CStr) {}
+
+/// Underlying android logger backend
+pub struct AndroidLogger {
+ config: RwLock<Config>,
+}
+
+impl AndroidLogger {
+ /// Create new logger instance from config
+ pub fn new(config: Config) -> AndroidLogger {
+ AndroidLogger {
+ config: RwLock::new(config),
+ }
+ }
+}
+
+lazy_static! {
+ static ref ANDROID_LOGGER: AndroidLogger = AndroidLogger::default();
+}
+
+const LOGGING_TAG_MAX_LEN: usize = 23;
+const LOGGING_MSG_MAX_LEN: usize = 4000;
+
+impl Default for AndroidLogger {
+ /// Create a new logger with default config
+ fn default() -> AndroidLogger {
+ AndroidLogger {
+ config: RwLock::new(Config::default()),
+ }
+ }
+}
+
+impl Log for AndroidLogger {
+ fn enabled(&self, _: &Metadata) -> bool {
+ true
+ }
+
+ fn log(&self, record: &Record) {
+ let config = self.config
+ .read()
+ .expect("failed to acquire android_log filter lock for read");
+
+ if !config.filter_matches(record) {
+ return;
+ }
+
+ // tag must not exceed LOGGING_TAG_MAX_LEN
+ let mut tag_bytes: [u8; LOGGING_TAG_MAX_LEN + 1] = unsafe { mem::uninitialized() };
+
+ let module_path = record.module_path().unwrap_or_default().to_owned();
+
+ // If no tag was specified, use module name
+ let custom_tag = &config.tag;
+ let tag = custom_tag.as_ref().map(|s| s.as_bytes()).unwrap_or(module_path.as_bytes());
+
+ // truncate the tag here to fit into LOGGING_TAG_MAX_LEN
+ self.fill_tag_bytes(&mut tag_bytes, tag);
+ // use stack array as C string
+ let tag: &CStr = unsafe { CStr::from_ptr(mem::transmute(tag_bytes.as_ptr())) };
+
+ // message must not exceed LOGGING_MSG_MAX_LEN
+ // therefore split log message into multiple log calls
+ let mut writer = PlatformLogWriter::new(record.level(), tag);
+
+ // If a custom tag is used, add the module path to the message.
+ // Use PlatformLogWriter to output chunks if they exceed max size.
+ let _ = if custom_tag.is_some() {
+ fmt::write(&mut writer, format_args!("{}: {}", module_path, *record.args()))
+ } else {
+ fmt::write(&mut writer, *record.args())
+ };
+
+ // output the remaining message (this would usually be the most common case)
+ writer.flush();
+ }
+
+ fn flush(&self) {}
+}
+
+impl AndroidLogger {
+ fn fill_tag_bytes(&self, array: &mut [u8], tag: &[u8]) {
+ if tag.len() > LOGGING_TAG_MAX_LEN {
+ for (input, output) in tag.iter()
+ .take(LOGGING_TAG_MAX_LEN - 2)
+ .chain(b"..\0".iter())
+ .zip(array.iter_mut())
+ {
+ *output = *input;
+ }
+ } else {
+ for (input, output) in tag.iter()
+ .chain(b"\0".iter())
+ .zip(array.iter_mut())
+ {
+ *output = *input;
+ }
+ }
+ }
+}
+
+/// Filter for android logger.
+pub struct Config {
+ log_level: Option<Level>,
+ filter: Option<env_logger::filter::Filter>,
+ tag: Option<CString>,
+}
+
+impl Default for Config {
+ fn default() -> Self {
+ Config {
+ log_level: None,
+ filter: None,
+ tag: None,
+ }
+ }
+}
+
+impl Config {
+ /// Change the minimum log level.
+ ///
+ /// All values above the set level are logged. For example, if
+ /// `Warn` is set, the `Error` is logged too, but `Info` isn't.
+ pub fn with_min_level(mut self, level: Level) -> Self {
+ self.log_level = Some(level);
+ self
+ }
+
+ fn filter_matches(&self, record: &Record) -> bool {
+ if let Some(ref filter) = self.filter {
+ filter.matches(&record)
+ } else {
+ true
+ }
+ }
+
+ pub fn with_filter(mut self, filter: env_logger::filter::Filter) -> Self {
+ self.filter = Some(filter);
+ self
+ }
+
+ pub fn with_tag<S: Into<Vec<u8>>>(mut self, tag: S) -> Self {
+ self.tag = Some(CString::new(tag).expect("Can't convert tag to CString"));
+ self
+ }
+}
+
+struct PlatformLogWriter<'a> {
+ #[cfg(target_os = "android")] priority: LogPriority,
+ #[cfg(not(target_os = "android"))] priority: Level,
+ len: usize,
+ last_newline_index: usize,
+ tag: &'a CStr,
+ buffer: [u8; LOGGING_MSG_MAX_LEN + 1],
+}
+
+impl<'a> PlatformLogWriter<'a> {
+ #[cfg(target_os = "android")]
+ pub fn new(level: Level, tag: &CStr) -> PlatformLogWriter {
+ PlatformLogWriter {
+ priority: match level {
+ Level::Warn => LogPriority::WARN,
+ Level::Info => LogPriority::INFO,
+ Level::Debug => LogPriority::DEBUG,
+ Level::Error => LogPriority::ERROR,
+ Level::Trace => LogPriority::VERBOSE,
+ },
+ len: 0,
+ last_newline_index: 0,
+ tag,
+ buffer: unsafe { mem::uninitialized() },
+ }
+ }
+
+ #[cfg(not(target_os = "android"))]
+ pub fn new(level: Level, tag: &CStr) -> PlatformLogWriter {
+ PlatformLogWriter {
+ priority: level,
+ len: 0,
+ last_newline_index: 0,
+ tag,
+ buffer: unsafe { mem::uninitialized() },
+ }
+ }
+
+ /// Flush some bytes to android logger.
+ ///
+ /// If there is a newline, flush up to it.
+ /// If ther was no newline, flush all.
+ ///
+ /// Not guaranteed to flush everything.
+ fn temporal_flush(&mut self) {
+ let total_len = self.len;
+
+ if total_len == 0 {
+ return;
+ }
+
+ if self.last_newline_index > 0 {
+ let copy_from_index = self.last_newline_index;
+ let remaining_chunk_len = total_len - copy_from_index;
+
+ self.output_specified_len(copy_from_index);
+ self.copy_bytes_to_start(copy_from_index, remaining_chunk_len);
+ self.len = remaining_chunk_len;
+ } else {
+ self.output_specified_len(total_len);
+ self.len = 0;
+ }
+ self.last_newline_index = 0;
+ }
+
+ /// Flush everything remaining to android logger.
+ fn flush(&mut self) {
+ let total_len = self.len;
+
+ if total_len == 0 {
+ return;
+ }
+
+ self.output_specified_len(total_len);
+ self.len = 0;
+ self.last_newline_index = 0;
+ }
+
+ /// Output buffer up until the \0 which will be placed at `len` position.
+ fn output_specified_len(&mut self, len: usize) {
+ let mut last_byte: u8 = b'\0';
+ mem::swap(&mut last_byte, unsafe {
+ self.buffer.get_unchecked_mut(len)
+ });
+
+ let msg: &CStr = unsafe { CStr::from_ptr(mem::transmute(self.buffer.as_ptr())) };
+ android_log(self.priority, self.tag, msg);
+
+ *unsafe { self.buffer.get_unchecked_mut(len) } = last_byte;
+ }
+
+ /// Copy `len` bytes from `index` position to starting position.
+ fn copy_bytes_to_start(&mut self, index: usize, len: usize) {
+ let src = unsafe { self.buffer.as_ptr().offset(index as isize) };
+ let dst = self.buffer.as_mut_ptr();
+ unsafe { ptr::copy(src, dst, len) };
+ }
+}
+
+impl<'a> fmt::Write for PlatformLogWriter<'a> {
+ fn write_str(&mut self, s: &str) -> fmt::Result {
+ let mut incomming_bytes = s.as_bytes();
+
+ while !incomming_bytes.is_empty() {
+ let len = self.len;
+
+ // write everything possible to buffer and mark last \n
+ let new_len = len + incomming_bytes.len();
+ let last_newline = self.buffer[len..LOGGING_MSG_MAX_LEN]
+ .iter_mut()
+ .zip(incomming_bytes)
+ .enumerate()
+ .fold(None, |acc, (i, (output, input))| {
+ *output = *input;
+ if *input == b'\n' {
+ Some(i)
+ } else {
+ acc
+ }
+ });
+
+ // update last \n index
+ if let Some(newline) = last_newline {
+ self.last_newline_index = len + newline;
+ }
+
+ // calculate how many bytes were written
+ let written_len = if new_len <= LOGGING_MSG_MAX_LEN {
+ // if the len was not exceeded
+ self.len = new_len;
+ new_len - len // written len
+ } else {
+ // if new length was exceeded
+ self.len = LOGGING_MSG_MAX_LEN;
+ self.temporal_flush();
+
+ LOGGING_MSG_MAX_LEN - len // written len
+ };
+
+ incomming_bytes = &incomming_bytes[written_len..];
+ }
+
+ Ok(())
+ }
+}
+
+/// Send a log record to Android logging backend.
+///
+/// This action does not require initialization. However, without initialization it
+/// will use the default filter, which allows all logs.
+pub fn log(record: &Record) {
+ ANDROID_LOGGER.log(record)
+}
+
+/// Initializes the global logger with an android logger.
+///
+/// This can be called many times, but will only initialize logging once,
+/// and will not replace any other previously initialized logger.
+///
+/// It is ok to call this at the activity creation, and it will be
+/// repeatedly called on every lifecycle restart (i.e. screen rotation).
+pub fn init_once(config: Config) {
+ if let Err(err) = log::set_logger(&*ANDROID_LOGGER) {
+ debug!("android_logger: log::set_logger failed: {}", err);
+ } else {
+ if let Some(level) = config.log_level {
+ log::set_max_level(level.to_level_filter());
+ }
+ *ANDROID_LOGGER
+ .config
+ .write()
+ .expect("failed to acquire android_log filter lock for write") = config;
+ }
+}
