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tutorial.md

File metadata and controls

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Getting Started with Shock

This tutorial walks you through running Shock locally and performing common operations using curl. By the end you will know how to create nodes, upload and download files, set metadata, query by attributes, and manage access control.

Prerequisites

  • Docker and Docker Compose
  • curl (comes pre-installed on most systems)
  • Optional: jq for pretty-printing JSON responses

1. Start Shock

From the repository root:

docker-compose up -d

This starts Shock (port 7445) and MongoDB. Verify the server is running:

curl http://localhost:7445/ | jq .

You should see a JSON response with the Shock version and server information.

2. Create Your First Node

Create an empty node (metadata only, no file):

curl -X POST http://localhost:7445/node | jq .

The response contains a data.id field -- this is your node's UUID. Save it for later:

NODE_ID=<paste-your-uuid-here>

3. Upload a File

Upload a file by creating a new node with a file attached:

curl -X POST -F 'upload=@myfile.txt' http://localhost:7445/node | jq .

The response includes the file name, size, and MD5 checksum under data.file. Save the node ID:

NODE_ID=$(curl -s -X POST -F 'upload=@myfile.txt' http://localhost:7445/node | jq -r .data.id)
echo $NODE_ID

You can also upload a file to an existing node:

curl -X PUT -F 'upload=@myfile.txt' http://localhost:7445/node/$NODE_ID | jq .

4. Download a File

Download the file stored in a node:

curl -OJ "http://localhost:7445/node/${NODE_ID}?download"

The -OJ flags tell curl to save the file using the server-provided filename.

To just stream to stdout:

curl "http://localhost:7445/node/${NODE_ID}?download"

5. Set Attributes

Attributes are free-form JSON metadata attached to a node. Add them with an inline string:

curl -X PUT -F 'attributes_str={"project":"my-experiment", "sample_nr": 1, "organism": "E. coli"}' \
  http://localhost:7445/node/$NODE_ID | jq .

Or from a JSON file:

echo '{"project":"my-experiment", "sample_nr": 1}' > attrs.json
curl -X PUT -F 'attributes=@attrs.json' http://localhost:7445/node/$NODE_ID | jq .

6. Query Nodes

Search for nodes by attribute values:

# Find all nodes in a project
curl "http://localhost:7445/node?query&project=my-experiment" | jq .

# Limit results
curl "http://localhost:7445/node?query&project=my-experiment&limit=10" | jq .

# Paginate with offset
curl "http://localhost:7445/node?query&project=my-experiment&limit=10&offset=20" | jq .

7. View a Node

Retrieve the full metadata for a node:

curl http://localhost:7445/node/$NODE_ID | jq .

8. Delete a Node

curl -X DELETE http://localhost:7445/node/$NODE_ID | jq .

9. Access Control (ACLs)

When authentication is enabled, nodes have access control lists. View a node's ACLs:

curl http://localhost:7445/node/$NODE_ID/acl/ | jq .

Grant read access to a user:

curl -X PUT "http://localhost:7445/node/$NODE_ID/acl/read?users=username" | jq .

Remove read access:

curl -X DELETE "http://localhost:7445/node/$NODE_ID/acl/read?users=username" | jq .

ACL types: read, write, delete, owner.

10. S3 Storage with MinIO (Optional)

Shock can store files in S3-compatible object storage. For local development and testing, you can use MinIO as an S3 backend.

Start the MinIO stack

docker-compose -f docker-compose.minio.yml up -d shock-mongo shock-minio shock-minio-init shock-server

This starts:

  • MinIO -- S3-compatible object store (API on port 9000, console on port 9001)
  • MongoDB -- metadata storage
  • Shock -- configured with auto-upload to MinIO

Upload a file and verify S3 storage

Upload a file:

NODE_ID=$(curl -s -X POST -F 'upload=@myfile.txt' http://localhost:7445/node | jq -r .data.id)
echo $NODE_ID

Check the node's storage locations (the auto-upload worker copies the file to MinIO in the background):

# Wait a moment for the auto-upload, then check locations
curl http://localhost:7445/node/$NODE_ID | jq .data.locations

You should see an entry for the S3 location once the upload completes.

Browse MinIO

Open the MinIO console at http://localhost:9001 (login: minioadmin / minioadmin) to see the uploaded files in the shock-data bucket.

Clean up

docker-compose -f docker-compose.minio.yml down -v

Next Steps