shinaisan

Winston Timestamp Example

See fecha for details of timestamp formats.

Output

$ node index.js simple a b c
info: arguments: [ 'a', 'b', 'c', [length]: 3 ] {"0":"a","1":"b","2":"c","timestamp":"2018-08-29T12:26:14.844Z"}

shinaisan

const { createLogger, format, transports } = require('winston');

let test = {};

test.simple = () => {
  const logger = createLogger({
    format: format.simple(),
    transports: [new transports.Console()]
  });
  logger.info('Hello world!');

shinaisan

Example of morgan log file rotation

References

• morgan - npm
• expressjs/morgan: HTTP request logger middleware for node.js

shinaisan

# See https://help.github.com/ignore-files/ for more about ignoring files.

# dependencies
/node_modules

# testing
/coverage

# production
/dist

shinaisan

Short Example of Logstash Multiple Pipelines

This gist is just a personal practice record of Logstash Multiple Pipelines.

The following summary assumes that the PATH contains Logstash and Filebeat executables and they run locally on localhost.

Logstash config

shinaisan

def greedy_set_cover(universe, subsets, costs):
    covered = set()
    selection = []
    cover_cost = 0
    while (len(covered) < universe):
        # Cost effectiveness
        ce = [ float('inf') if len(uncovered) == 0 else (costs[i] / len(uncovered))
                for i in range(len(subsets))
                for uncovered in [subsets[i].difference(covered)] ]
        index = min(range(len(subsets)), key = lambda i: ce[i])

shinaisan

#include <iostream>
#include <iterator>
#include <string>
#include <sstream>
#include <vector>
#include <set>
#include <algorithm>
#include <numeric>
#include <limits>
#include <cassert>

shinaisan

# See https://help.github.com/ignore-files/ for more about ignoring files.

# dependencies
/node_modules

# testing
/coverage

# production
/dist

shinaisan

SVG with image syntax of MD (Does not work)

Full URL with sanitize=true

shinaisan

pthread_kill Example

This short program deliberately kills a thread after pthread_join so it may cause SEGV on some targets.

Compiling

gcc -pthread thread1.c