This script asynchronously fetches component counts from Nexus Repository Manager and outputs the data to a JSON file. It is designed to handle multiple repositories concurrently, adjusting to network conditions and server response times. This utility is especially useful for administrators and teams who manage large Nexus repository instances and require regular reports on repository contents.

• Python 3.7+
• aiohttp asyncio argparse libraries
• Nexus Repository Manager with REST API access
• NEXUS_USERNAME and NEXUS_PASSWORD environment variables for authentication

Install the required Python library using pip:

pip install aiohttp asyncio argparse

The script supports several command-line arguments to customize its operation:

• --url (required): The base URL for the Nexus API.

• --type (optional): Filters repositories by type (e.g., hosted, proxy).

• --format (optional): Filters repositories by format (e.g., maven, npm).

• --concurrency (optional): Specifies the maximum number of concurrent requests (default is 10).

• --output-dir (optional): Specifies the directory to store the output JSON files (default is the current directory).

ALL flags can be used together.

The speed of this script depends on the performance of your Nexus instance and its total component count. During testing it processed roughly 60.0000 components within 8~10 minutes against a Nexus instance with MINIMUM load.

Run the script with the minimum required parameters:

export NEXUS_USERNAME=<yourUserName> && export NEXUS_PASSWORD='<yourPassword>'
python nexus_component_counter.py --url http://localhost:8081/service/rest/v1

Run the script for only maven format repositories of ALL types:

python nexus_component_counter.py --url http://localhost:8081/service/rest/v1 --format maven

Run the script for only maven format repositories with type 'hosted':

python nexus_component_counter.py --url http://localhost:8081/service/rest/v1 --format maven --type hosted

Run the script with a higher level of concurrency to handle more repositories simultaneously:

python nexus_component_counter.py --url http://localhost:8081/service/rest/v1 --concurrency 20

Run the script and specify an output directory for the results:

python nexus_component_counter.py --url http://localhost:8081/service/rest/v1 --output-dir /path/to/output

The script generates a JSON file named based on the type and format parameters provided. If no type or format is specified, it defaults to “all”. For example: hosted_maven_components.json for hosted Maven repositories. all_all_components.json if no type or format is specified.

The JSON file will contain a dictionary -sorted by count number- where each key is a repository name and the value specifying the type, format, and count of components within that repository:

{
 "repo1": {
   "type": "hosted",
   "format": "maven",
   "count": 1200
 },
 "repo2": {
   "type": "proxy",
   "format": "npm",
   "count": 3000
 }
}

During execution it will report back to the console after each API call:

Total repositories fetched: 16
Starting processing repository: repo1-helm-charts
Found 1 components so far in repo1-helm-charts  (Completed repos: 0/16)
Completed 1/16: repo1-helm-charts
Found 7 components so far in repo2-helm-charts  (Completed repos: 1/16)
Completed 2/16: repo2-helm-charts
Found 7 components so far in repo3-helm-charts  (Completed repos: 2/16)
Completed 3/16: repo3-helm-charts
Found 20 components so far in repo4-helm-charts  (Completed repos: 3/16)
Found 30 components so far in repo4-helm-charts  (Completed repos: 3/16)
(...)
Completed 16/16: repo16-helm-charts

This file provides a clear and organized view of component counts across your Nexus repositories, useful for auditing, monitoring, and reporting purposes.