Add level filtering option to stream

[willm]

Fixes #16
Adds a level property to BunyanSlack constructor and ignores lower level errors if specified.

[coveralls]

Coverage remained the same at 100.0% when pulling efdd390 on willm:feature/control-level-via-stream into 21e1703 on qualitybath:master.

[coveralls]

Coverage remained the same at 100.0% when pulling efdd390 on willm:feature/control-level-via-stream into 21e1703 on qualitybath:master.

[tikotzky]

Hi,

Thanks for the PR. I'm just trying to understand your use case. Are you using bunyan with a single stream or multiple streams?

As far as I can tell in either case you should be able to specify the stream level using bunyan directly. For example...

const slackLogger = new BunyanSlack({
  webhook_url: 'mywebhookurl'
}),

// single stream
bunyan.createLogger({
    name: 'myapp',
    stream: slackLogger,
    level: 'info' // <-- log INFO and above to slack
});

// multiple streams
bunyan.createLogger({
  name: 'myapp',
  streams: [
    {
      level: 'info',
      stream: process.stdout  // log INFO and above to stdout
    },
    {
      level: 'error',
      stream: slackLogger     // log ERROR and above to slack
    }
  ]
});

Let me know if that is what you're looking to accomplish.

[willm]

Hi @tikotzky I'm looking to achieve your multiple streams example. I see, I will try what you mentioned. Maybe I've misunderstood.