grpcio 0.2.1

The rust language implementation of gRPC, base on the gRPC c core library.
Documentation 
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// Copyright 2017 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

use std::ffi::CStr;

use grpc_sys::{self, GprLogFuncArgs, GprLogSeverity};
use log::{self, LogLevel, LogLevelFilter, LogLocation};

#[inline]
fn severity_to_log_level(severity: GprLogSeverity) -> LogLevel {
    match severity {
        GprLogSeverity::Debug => LogLevel::Debug,
        GprLogSeverity::Info => LogLevel::Info,
        GprLogSeverity::Error => LogLevel::Error,
    }
}

extern "C" fn delegate(c_args: *mut GprLogFuncArgs) {
    let args = unsafe { &*c_args };
    let level = severity_to_log_level(args.severity);
    if !log_enabled!(level) {
        return;
    }

    // can't panic.
    let file_str = unsafe { CStr::from_ptr(args.file).to_str().unwrap() };
    let line = args.line as u32;

    // use hidden API for now, will
    // TODO: use public API once available.
    let location = LogLocation {
        __module_path: module_path!(),
        __file: file_str,
        __line: line,
    };
    let msg = unsafe { CStr::from_ptr(args.message).to_string_lossy() };
    log::__log(level, module_path!(), &location, format_args!("{}", msg));
}

/// Redirect grpc log to rust's log implementation.
pub fn redirect_log() {
    let level = match log::max_log_level() {
        LogLevelFilter::Off => unsafe {
            // disable log.
            grpc_sys::gpr_set_log_function(None);
            return;
        },
        LogLevelFilter::Error | LogLevelFilter::Warn => GprLogSeverity::Error,
        LogLevelFilter::Info => GprLogSeverity::Info,
        LogLevelFilter::Debug | LogLevelFilter::Trace => GprLogSeverity::Debug,
    };

    unsafe {
        grpc_sys::gpr_set_log_verbosity(level);
        grpc_sys::gpr_set_log_function(Some(delegate));
    }
}