logup 0.1.0

Logup is a UNIX-style command that can be used to pipe stdout logs to location on disk or in the cloud without the need of an agent, logrotate, systemd or other configuration files
Documentation 
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use crate::report_err;
use crate::writer::AsyncLogWriter;
use async_trait::async_trait;
use aws_config::BehaviorVersion;
use aws_sdk_cloudwatchlogs::config::retry::RetryConfig;
use aws_sdk_cloudwatchlogs::types::InputLogEvent;
use aws_sdk_cloudwatchlogs::Client;
use clap::Args;
use std::time::{SystemTime, UNIX_EPOCH};

#[derive(Args)]
#[group()]
pub struct AWSArgs {
    #[arg(
        long,
        help = "Enable uploading logs to AWS Logs",
        requires = "aws_log_group_name"
    )]
    aws: bool,

    #[arg(
        long,
        requires = "aws",
        env = "AWS_LOG_GROUP_NAME",
        hide_env_values = true
    )]
    aws_log_group_name: Option<String>,

    #[arg(
        long,
        requires = "aws",
        env = "AWS_LOG_STREAM_NAME",
        hide_env_values = true,
        help = "Log stream name [default: hostname]"
    )]
    aws_log_stream_name: Option<String>,
}

pub struct AWSLogsWriter {
    client: Client,
    log_group_name: String,
    log_stream_name: String,
}

impl AWSLogsWriter {
    pub async fn new(args: &AWSArgs, max_retries: u32) -> Option<Self> {
        if !args.aws {
            return None;
        }

        let log_group_name = args.aws_log_group_name.clone().unwrap();
        let log_stream_name = args
            .aws_log_stream_name
            .clone()
            .unwrap_or_else(|| hostname::get().unwrap().into_string().unwrap());
        let client = aws_sdk_cloudwatchlogs::Client::new(
            &aws_config::defaults(BehaviorVersion::latest())
                .retry_config(
                    RetryConfig::standard().with_max_attempts(max_retries + 1), // initial call is included
                )
                .load()
                .await,
        );
        create_log_group(&client, &log_group_name).await;
        create_log_stream(&client, &log_group_name, &log_stream_name).await;
        let writer = Self {
            client,
            log_group_name,
            log_stream_name,
        };
        Some(writer)
    }
}

#[async_trait]
impl AsyncLogWriter for AWSLogsWriter {
    async fn write_logs(&mut self, time: SystemTime, buf: &[u8]) -> std::io::Result<()> {
        let timestamp = time.duration_since(UNIX_EPOCH).unwrap().as_millis() as i64;

        self.client
            .put_log_events()
            .log_group_name(&self.log_group_name)
            .log_stream_name(&self.log_stream_name)
            .set_log_events(Some(vec![InputLogEvent::builder()
                .timestamp(timestamp)
                .message(String::from_utf8_lossy(buf).to_string())
                .build()
                .unwrap()]))
            .send()
            .await
            .unwrap();

        Ok(())
    }
}

macro_rules! is_resource_already_exists_exception {
    ($err:expr) => {
        $err.as_service_error()
            .map(|se| se.is_resource_already_exists_exception())
            .unwrap_or(false)
    };
}

async fn create_log_stream(client: &Client, log_group_name: &str, log_stream_name: &str) {
    let resp = client
        .create_log_stream()
        .log_group_name(log_group_name)
        .log_stream_name(log_stream_name)
        .send()
        .await;

    if let Err(e) = resp {
        if !is_resource_already_exists_exception!(e) {
            report_err(&e);
            panic!(
                "Error creating log stream {}:log-stream:{}: {}",
                log_group_name, log_stream_name, e
            );
        }
    }
}

async fn create_log_group(client: &Client, log_group_name: &str) {
    let resp = client
        .create_log_group()
        .log_group_name(log_group_name)
        .send()
        .await;

    if let Err(e) = resp {
        if !is_resource_already_exists_exception!(e) {
            report_err(&e);
            panic!("Error creating log group: {}", e);
        }
    }
}