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Google Cloud Storage


Coralogix provides a predefined function to forward your logs from Google Cloud Storage straight to Coralogix.



Create Cloud Function in your Google Cloud Console with the following settings:

Function settings


  1. Increase “Memory allocated“ to “1 GB“.
  2. Change “Trigger“ to “Cloud Storage“.
  3. Change “Event Type“ to “Finalize/Create“.
  4. Select your GCS Bucket.
  5. Change “Runtime“ to “Python 3.7“.
  6. Paste the following code to main.py:

# -*- coding: utf-8 -*-

Coralogix GCP function
Author: Coralogix Ltd.
Email: [email protected]

import os
import re
import sys
import gzip
import logging
from google.cloud import storage
from coralogix.handlers import CoralogixLogger

__name__ = 'gcsToCoralogix'
__author__ = 'Coralogix Ltd.'
__email__ = '[email protected]'
__copyright__ = 'Copyright 2019, Coralogix Ltd.'
__credits__ = ['Ariel Assaraf', 'Amnon Shahar', 'Eldar Aliiev']
__license__ = 'Apache Version 2.0'
__version__ = '1.0.0'
__maintainer__ = 'Coralogix Ltd.'
__date__ = '1 April 2019'
__status__ = 'Stable'

# Get function parameters
PRIVATE_KEY = os.environ.get('private_key')
APP_NAME = os.environ.get('app_name', 'NO_APPLICATION')
SUB_SYSTEM = os.environ.get('sub_name', 'NO_SUBSYSTEM')
NEWLINE_PATTERN = os.environ.get('newline_pattern', '(?:\r\n|\r|\n)')

# Function entrypoint
def to_coralogix(event, context):
Function entrypoint
:param event: event metadata
:type event: dict
:param context: event context
:type context: dict

def get_severity(message: str) -> int:
Extract severity from message text
:param message: log record text
:type message: str
:return: severity value
:rtype: int
severity = 3
if 'Warning' in message or 'warn' in message:
severity = 4
if 'Error' in message or 'Exception' in message:
severity = 5
return severity

# Initialize GCS client
client = storage.Client()

# Initialize Coralogix logger
logger = CoralogixLogger(

logging.info(f"Processing file {event['name']}")

# Get file content
bucket = client.get_bucket(event['bucket'])
blob = bucket.get_blob(event['name'])
content = blob.download_as_string()

# Check if file is compressed
if event['contentType'] == 'application/gzip' or \
logging.info(f"Uncompress file {event['name']}")
# Decompress file
content = gzip.decompress(content)
except Exception as exc:
logging.fatal(f"Cannot uncompress file {event['name']}: ", exc)

# Split file into line and remove empty lines
logs = list(filter(None, re.split(NEWLINE_PATTERN, content.decode('utf-8'))))
logging.info(f"Number of logs: {len(logs)}")

# Send logs to Coralogix
for log in logs:


7. Paste the following packages to requirements.txt:



8. Increase “Timeout“ to “60 seconds“.

9. Add the mandatory environment variables: private_key, app_name, sub_name:

  • Private Key – A unique ID that represents your company, this Id will be sent to your mail once you register to Coralogix.
  • Application Name – Used to separate your environment, e.g. SuperApp-test/SuperApp-prod.
  • SubSystem Name – Your application probably has multiple subsystems, for example, Backend servers, Middleware, Frontend servers etc.

10. Multiline pattern: Coralogix supports multiline pattern by default, you can define a custom pattern with environment variables, for example:

newline_pattern [\s(?={)|(?<=})\s,\s(?={)|(?<=})\s\].


11. Click “Create”.

gcloud CLI

To set up the function, execute this:

$ curl -sSL -o gcsToCoralogix.zip https://raw.githubusercontent.com/coralogix/integrations-docs/master/integrations/gcp/gcs/lambda/gcsToCoralogix.zip
$ unzip gcsToCoralogix.zip -d gcsToCoralogix/
$ gcloud functions deploy gcsToCoralogix \
--region=us-central1 \
--runtime=python37 \
--memory=1024MB \
--timeout=60s \
--entry-point=to_coralogix \
--source=gcsToCoralogix \
--trigger-resource=YOUR_BUCKET_NAME \
--trigger-event=google.storage.object.finalize \



Here is the Terraform module to deploy the Cloud Function.

Add this module to your manifest and change its options:

provider "google" {
region = "us-central1"

module "gcs_to_coralogix" {
source = "git::https://github.com/coralogix/integrations-docs.git//integrations/gcp/gcs/terraform"

private_key = "YOUR_PRIVATE_KEY"
app_name = "APP_NAME"
sub_name = "SUB_NAME"
bucket_name = "YOUR_BUCKET_NAME"


Download the module and apply these changes:

$ terraform init
$ terraform apply


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