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go-make-log

Generate fake application log files (e.g. as input to log processors). This can be used to stress test the REST /var/log reader go-read-var-log.

For safety, this will not overwrite an existing file.

Warning: this does not check if disk space will be exhausted.

Sample Output

Create a JSON file (Running in Docker)

$ docker build -t go-make-log . && docker run -v $(pwd):/output go-make-log -f json -o /output/log.json
$ du -h log.json    # Disk space used
1.0M log.json
$ wc -l log.json    # Number of lines
7531 log.json
$ head -n 3 log.json
{"level":"debug","message":"etisat rif onafon ari y nih ogiwab fosa itecawo to sef weduh baro e halui","timestamp":"2023-10-04T22:03:14.754762Z"}
{"level":"debug","message":"alen ehof h edix ofisew i luwesa ca a hagur get tufiroy wuhoai iseba","timestamp":"2023-10-04T22:03:14.754954Z"}
{"level":"info","message":"p uriye esitos dociha tud oce nosen i sobihas lasobu talena h eto ic","timestamp":"2023-10-04T22:03:14.754994Z"}

Create a 1GiB file (Running Locally)

$ go run ./main -o log.txt -s 1GiB
$ du -h log.txt     # Disk space used
1.0G log.txt
$ wc -l log.txt     # Number of lines
10578414 log.txt
$ head -n 3 log.txt
2023-10-04T21:46:42.162239Z|info |ehuw ohemo elati l o wogeh arito akeho oheroc potawoh nes ha
2023-10-04T21:46:42.162360Z|debug|godet p zeni rela um beg epaheb bedi ihuyi yor tam el e afuni
2023-10-04T21:46:42.162376Z|debug|erol f o bisow ago r erut sov senas eg ad

Running in Docker

  • docker build -t go-make-log . - Build the Docker image
  • docker run go-make-log <args> - Run with the given arguments

Running Locally

  • go run ./main <args> - Run the main.go file with the given arguments

Run Unit Tests

  • go test ./... -count=1 - Run all unit tests

Arguments

Argument Description
-h | --help Print the help message
-l Add line number to each log event
-lt Log with timestamps (UTC)
-f <delimited|json> Output format (default delimited)
-o <filename> Output filename
-s <size> Minimum output size (default 1MiB)