Google Cloud Logging

This crate contains structures for Google Cloud Structured logging. This allows for adding more metadata to log statements that will be interpreted by the Google Cloud "Logging" service and can be viewed in the "Logs Explorer".

Some errors can also be formatted so the "Error Reporting" service will group them.

Usage

Here you can see a snippet of how you can use it in you logging library.

let log_entry = GoogleCloudStructLog {
    severity: Some(match level {
        Level::Error => GCLogSeverity::Error,
        Level::Warn => GCLogSeverity::Warning,
        Level::Info => GCLogSeverity::Info,
        Level::Debug => GCLogSeverity::Debug,
        Level::Trace => GCLogSeverity::Default,
    }),
    report_type: match level {
        // More info see: https://cloud.google.com/error-reporting/docs/formatting-error-messages#@type
        Level::Error => Some("type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent".to_owned()),
        _ => None,
    },
    message: Some(
        format!(
            "{}{}", 
            record.args(),
            example_backtrace(),
        )
    ),
    operation: Some(GCOperation {
        id: Some("My Service"),
        producer: Some("MyService.Backend"),
        ..Default::default()
    }),
    source_location: Some(GCSourceLocation {
        file: record.file_static(),
        line: record.line().map(|s| s.to_string()),
        function: record.module_path_static(),
    }),
    time: Some(Utc::now()),
    ..Default::default()
};
println!(
    "{}",
    serde_json::to_string(&log_entry).expect("Error during logging")
);

To run the example use: cargo run --example log This will result in the following output:

{"severity":"info","message":"Start logging:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658","time":"2021-12-20T16:33:41.643966093Z","logging.googleapis.com/operation":{"id":"My Service","producer":"MyService.Backend"},"logging.googleapis.com/sourceLocation":{"file":"examples/log/main.rs","line":"11","function":"log"}}
{"severity":"warning","message":"Oh no, things might go wrong soon.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658","time":"2021-12-20T16:33:41.644085317Z","logging.googleapis.com/operation":{"id":"My Service","producer":"MyService.Backend"},"logging.googleapis.com/sourceLocation":{"file":"examples/log/main.rs","line":"12","function":"log"}}
{"severity":"error","message":"Yeah, this is not good.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658","@type":"type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent","time":"2021-12-20T16:33:41.644179397Z","logging.googleapis.com/operation":{"id":"My Service","producer":"MyService.Backend"},"logging.googleapis.com/sourceLocation":{"file":"examples/log/main.rs","line":"13","function":"log"}}
{"severity":"default","message":"Something went wrong in `my service`.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658","time":"2021-12-20T16:33:41.644276526Z","logging.googleapis.com/operation":{"id":"My Service","producer":"MyService.Backend"},"logging.googleapis.com/sourceLocation":{"file":"examples/log/main.rs","line":"14","function":"log"}}

Each line in the output above is 1 log message. Each log message is a json string. Note that this is not an array of json messages. Each json object is separated by a newline.

{
  "severity": "info",
  "message": "Start logging:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658",
  "time": "2021-12-20T16:38:13.654978059Z",
  "logging.googleapis.com/operation": {
    "id": "My Service",
    "producer": "MyService.Backend"
  },
  "logging.googleapis.com/sourceLocation": {
    "file": "examples/log/main.rs",
    "line": "11",
    "function": "log"
  }
}
{
  "severity": "warning",
  "message": "Oh no, things might go wrong soon.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658",
  "time": "2021-12-20T16:38:13.655138074Z",
  "logging.googleapis.com/operation": {
    "id": "My Service",
    "producer": "MyService.Backend"
  },
  "logging.googleapis.com/sourceLocation": {
    "file": "examples/log/main.rs",
    "line": "12",
    "function": "log"
  }
}
{
  "severity": "error",
  "message": "Yeah, this is not good.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658",
  "@type": "type.googleapis.com/google.devtools.clouderrorreporting.v1beta1.ReportedErrorEvent",
  "time": "2021-12-20T16:38:13.655236672Z",
  "logging.googleapis.com/operation": {
    "id": "My Service",
    "producer": "MyService.Backend"
  },
  "logging.googleapis.com/sourceLocation": {
    "file": "examples/log/main.rs",
    "line": "13",
    "function": "log"
  }
}
{
  "severity": "default",
  "message": "Something went wrong in `my service`.:\n   at services::module_name::he77c0bac773c93b4 line: 42\n   at services::module_name::h7ad5e699ac5d6658",
  "time": "2021-12-20T16:38:13.655335729Z",
  "logging.googleapis.com/operation": {
    "id": "My Service",
    "producer": "MyService.Backend"
  },
  "logging.googleapis.com/sourceLocation": {
    "file": "examples/log/main.rs",
    "line": "14",
    "function": "log"
  }
}

Tips

When logging your Rust service you might also want to capture panic message and format them the same way. This can be done using a panic hook.

License

The code in this project is licensed under the MIT or Apache 2.0 license.

All contributions, code and documentation, to this project will be similarly licensed.