l'oGGo: Rich Terminal User Interface Logging App

Introduction

For the impatient, go to Getting Started

l'oGGo or Log & Go is a rich Terminal User Interface app written in golang that harness the power of your terminal to digest log streams based on JSON based logs.

This can be used against applications running locally, on a Kubernetes cluster (see K8S Cheatsheet), GCP Stack Driver (Google Logs, see GCP-Stream Command) and many others.

Without l`oGGo

With l`oGGo

Loggo App leveraged tview and tcell projects for rich Terminal User Interface (TUI).

Getting Started

macOS/Linux with Homebrew/Linuxbrew:

The easiest way is to utilise Homebrew (macOS) or LinuxBrew (Linux) package management system. Once installed simply issue the following command:

brew tap aurc/loggo
brew install aurc/loggo/loggo

To update:

brew upgrade aurc/loggo/loggo

All Systems

Install with Go

Assuming you have go installed in your system (best choice if not homebrew) and bin packages are in your PATH, just run:

go install github.com/aurc/loggo@latest

Build from Source:

Including macOS, build from source. Pre-Reqs:

• Golang v1.8+
• Checkout the project from https://github.com/aurc/loggo/

go build -o loggo

Install the loggo binary in your system's binary bucket or add loggo binary to your path.

Download Pre-Compiled binary

This option might be suitable for you if you don't have Home/Linux-Brew or golang readly available for you. In this case you can download a pre-compiled exectuable binary for the following platforms:

Latest Release pre-build binaries here!

• Windows 11:

  Download a tar.gz file from pre-build binaries that match your platform:

  • Most of PCs will be amd64, so file format will be like loggo_x.y.z_windows_amd64.tar.gz. Note: If you own a Surface Pro, or virtualised windows on a Mac M series, you'll probably want to grab the arm64 version.
  • Open a terminal window (cmd.exe) and issue the following command in the folder you downloaded the file:

    tar -xvzf loggo_x.y.z_windows_amd64.tar.gz
    

  • A file loggo.exe will be extracted to the current folder.
  • You can place this file in a directory that's on your %PATH% so the command loggo is accessible from anywhere.

• Linux (both arm64 and amd64 plat):

  • ubuntu: tar.gz file from releases (e.g. loggo_vx.y.z_linux_.tar.gz)
  • debian: *.deb file from releases
  • redhat: *.rpm file from releases
  • alpine: *.apk file from releases

Using l'oGGo

Loggo can be used to stream parsed logs from a persisted file and from a piped input and also provides a tool for creating log templates.

Some Features

• Local Log filtering/search
  • Main log stream remains unaffected regardless of the source (gcp, pipe, file, etc...)
  • Display only log entries that match search/filter criteria
  • Convenient key finder and operators for filter expression crafting
• Drill down onto each log entry
• Copy Log-Entry to Clipboard
  • Note: Linux requires X11 dev package. For instance, install libx11-dev or xorg-dev or libX11-devel to access X window system.
• Navigate Left-Right-Up-Down on Large Grids
  • Select a Line
  • Use the arrow keys (↓ ↑ ← →)
• Select on screen text
  • Horizontally based selection (Alt + Mouse Click/Drag)
  • Block/Vertical based selection (Cmd+Opt+ Mouse Click/Drag - macOS)
  • Copy the selected text to clipboard (Cmd+C - macOS/Ctrl+C - other systems)
• Configure Rendering Templates:
• Fine Tune how columns are displayed (Template):
  • Note that single Value Matches are REGEX expressions.

help Command

To gain fine grained insight of each loggo command params, use the help command, e.g.:

loggo help
loggo help stream
loggo help template
loggo help gcp-stream

stream Command

From File:

loggo stream --file <my file>

With Template:

loggo stream --file <my file> --template <my template yaml>

From Pipe:

tail -f <my file> | loggo stream

Kubernetes example (See K8S Cheatsheet)

kubectl logs -f -n <namespace> <pod> | loggo stream

With Template:

tail -f <my file> | loggo stream --template <my template yaml>

Note that you can pipe to anything that produces an output to the stdin.

gcp-stream Command

l`oGGo natively supports GCP Logging but in order to use this feature, there are a few caveats:

• Your personal account has the required permissions to access the logging resources.

Note: gcp-stream does not support piped commands. If you want to use piped commands (e.g. chaining K8S output) use the stream command instead.

Example:

loggo gcp-stream \
    --filter 'resource.labels.namespace_name="some-namespace" resource.labels.container_name="some-container"' \
    --project some-project-ID \
    --from 10m

Where:

Usage:
  loggo gcp-stream [flags]

Flags:
  -p, --project string       GCP Project ID (required)
  
  ------------------- Optional Below ------------------
  
  -f, --filter string        Standard GCP filters
      --force-auth           Only effective if combined with gcloud flag. Force re-authentication even
                             if you may have a valid authentication file.
  -d, --from string          Start streaming from:
                               Relative: Use format "1s", "1m", "1h" or "1d", where:
                                         digit followed by s, m, h, d as second, minute, hour, day.
                               Fixed:    Use date format as "yyyy-MM-ddH24:mm:ss", e.g. 2022-07-30T15:00:00
                               Now:      Use "tail" to start from now (default "tail")
      --gcloud-auth          Use the existing GCloud CLI infrastructure installed on your system for GCP
                             authentication. You must have gcloud CLI installed and configured. If this
                             flag is not passed, it uses l'oggo native connector.
  -h, --help                 help for gcp-stream
      --params-list          List saved gcp connection/filtering parameters for convenient reuse.
      --params-load string   Load the parameters for reuse. If any additional parameters are
                             provided, it overrides the loaded parameter with the one explicitly provided.
      --params-save string   Save the following parameters (if provided) for reuse:
                               Project:   The GCP Project ID
                               Template:  The rendering template to be applied.
                               From:      When to start streaming from.
                               Filter:    The GCP specific filter parameters.
  -t, --template string      Rendering Template

For convenience, you can build a list of frequently used command parameters/flags and reuse them without having to rewrite lengthy list of parameters, for example:

loggo gcp-stream \
    --filter 'resource.labels.namespace_name="some-namespace" resource.labels.container_name="some-container"' \
    --project some-project-ID \
    --from 10m
    --template /tmp/myTemplate.yaml
    --params-save mySavedParams1

Then you simply issue:

loggo gcp-stream --params-load mySavedParams1

If you want to review all saved params buckets, issue the following command:

loggo gcp-stream --params-list

Additionally, you might want to overwrite some parameters. The example command uses --from 10m, and say you want to tail instead:

loggo gcp-stream --params-load mySavedParams1 --from tail

Any additional parameter provided will overwrite the loaded params at runtime.

template Command

The template command opens up the template editor without the need to stream logs. This is convenient if you want to craft templates prior using the loggo command.

Blank Canvas:

loggo template

Edit Existing Template:

loggo template --file <my template yaml>

K8S Cheatsheet

Combined logs of all pods of an application.

kubectl -n <some-namespace> logs -f deployment/<application-name> \
  --all-containers=true \
  --since=10m | loggo stream

Logs of a pod.

kubectl logs -f -n <some-namespace> <pod-name> | loggo stream

Current Limitations

Most of the items listed here are slated for development in the near future, prior the first release.

• Browse/Load new log templates on the fly.
• Create template with keys whose name contains / as it uses slashes to navigate to nested json branches.

Feedback

Please let us know your thoughts, feature requests and bug reports! Use the issues report link here: https://github.com/aurc/loggo/issues