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import tempfile
from pathlib import Path
from typing import List, Optional
# MCP-standardized error handling
class MCPError(Exception):
def __init__(self, message, stderr):
self.message = message
self.stderr = stderr
super().__init__(self.message)
def _run_command(cmd: List[str]):
"""Helper function to run a command and handle exceptions."""
try:
command_str = " ".join(cmd)
result = subprocess.run(
cmd,
capture_output=True,
text=True,
check=True,
)
return {
"command_executed": command_str,
"stdout": result.stdout,
"stderr": result.stderr,
}
except FileNotFoundError:
raise MCPError(f"Command '{cmd[0]}' not found. Is arvados-python-client installed and in the PATH?", "")
except subprocess.CalledProcessError as e:
raise MCPError(f"Command '{' '.join(cmd)}' failed with exit code {e.returncode}", e.stderr)
from mcp.server.fastmcp import FastMCP
SERVER_NAME = 'local_arvados_python_client'
mcp = FastMCP(SERVER_NAME)
@mcp.tool()
def arv_get(
object_locator: str,
destination_path: Optional[Path] = None,
filename: Optional[str] = None,
force: bool = False,
recursive: bool = False,
progress: bool = False,
) -> dict:
"""
Downloads an object from Arvados Keep to a local path or standard output.
Args:
object_locator: The UUID or portable data hash (PDH) of the object to download.
destination_path: Local path to save the object. If a directory, the original filename is used. If not provided, content is written to stdout.
filename: The name of the file to get from a collection.
force: Overwrite existing files if they exist.
recursive: Recursively download collections.
progress: Show a progress bar during download.
Returns:
A dictionary containing the command executed, stdout, stderr, and a list of output files.
"""
cmd = ["arv-get"]
if force:
cmd.append("--force")
if recursive:
cmd.append("--recursive")
if progress:
cmd.append("--progress")
if filename:
cmd.extend(["--filename", filename])
cmd.append(object_locator)
output_files = []
if destination_path:
# Ensure parent directory exists if a full path is given
if destination_path.parent and not destination_path.parent.is_dir():
destination_path.parent.mkdir(parents=True, exist_ok=True)
cmd.append(str(destination_path))
output_files.append(str(destination_path))
try:
result = _run_command(cmd)
result["output_files"] = output_files
return result
except MCPError as e:
return {
"command_executed": " ".join(cmd),
"stdout": "",
"stderr": e.stderr,
"error": e.message,
"output_files": [],
}
@mcp.tool()
def arv_put(
paths: List[Path],
name: Optional[str] = None,
owner: Optional[str] = None,
portable_data_hash: bool = False,
storage_class: Optional[str] = None,
num_retries: int = 5,
progress: bool = False,
) -> dict:
"""
Uploads local files or directories to Arvados Keep.
Args:
paths: One or more local file or directory paths to upload.
name: Set the name of the new collection.
owner: Set the owner project UUID for the new collection.
portable_data_hash: Use portable data hash to identify the collection.
storage_class: The storage class for the data (e.g., 'default', 'trash').
num_retries: Number of times to retry a failed API call.
progress: Show a progress bar during upload.
Returns:
A dictionary containing the command executed, stdout, and stderr.
"""
if not paths:
raise ValueError("At least one path must be provided for upload.")
for p in paths:
if not p.exists():
raise FileNotFoundError(f"Input path does not exist: {p}")
cmd = ["arv-put"]
if name:
cmd.extend(["--name", name])
if owner:
cmd.extend(["--owner", owner])
if portable_data_hash:
cmd.append("--portable-data-hash")
if storage_class:
cmd.extend(["--storage-class", storage_class])
if progress:
cmd.append("--progress")
# num_retries is a standard arvados client option
cmd.extend(["--num-retries", str(num_retries)])
cmd.extend([str(p) for p in paths])
try:
result = _run_command(cmd)
result["output_files"] = []
return result
except MCPError as e:
return {
"command_executed": " ".join(cmd),
"stdout": "",
"stderr": e.stderr,
"error": e.message,
"output_files": [],
}
@mcp.tool()
def arv_ls(
object_locator: str,
path: Optional[str] = None,
long_format: bool = False,
recursive: bool = False,
human_readable: bool = False,
) -> dict:
"""
Lists the contents of a collection in Arvados Keep.
Args:
object_locator: The UUID or portable data hash (PDH) of the collection to list.
path: A path within the collection to list.
long_format: Use a long listing format (similar to ls -l).
recursive: List subdirectories recursively.
human_readable: With long_format, print sizes in human-readable format (e.g., 1K, 234M, 2G).
Returns:
A dictionary containing the command executed, stdout (the listing), and stderr.
"""
cmd = ["arv-ls"]
if long_format:
cmd.append("-l")
if recursive:
cmd.append("-R")
if human_readable:
cmd.append("-h")
cmd.append(object_locator)
if path:
cmd.append(path)
try:
result = _run_command(cmd)
result["output_files"] = []
return result
except MCPError as e:
return {
"command_executed": " ".join(cmd),
"stdout": "",
"stderr": e.stderr,
"error": e.message,
"output_files": [],
}
@mcp.tool()
def arv_copy(
src_locators: List[str],
dest_project_uuid: str,
name: Optional[str] = None,
num_retries: int = 5,
) -> dict:
"""
Copies one or more objects to a destination project in Arvados.
Args:
src_locators: A list of source object UUIDs or portable data hashes (PDHs).
dest_project_uuid: The UUID of the destination project.
name: New name for the object(s). If copying multiple objects, this is ignored.
num_retries: Number of times to retry a failed API call.
Returns:
A dictionary containing the command executed, stdout, and stderr.
"""
if not src_locators:
raise ValueError("At least one source locator must be provided.")
if not dest_project_uuid:
raise ValueError("A destination project UUID must be provided.")
cmd = ["arv-copy"]
if name and len(src_locators) == 1:
cmd.extend(["--name", name])
cmd.extend(["--num-retries", str(num_retries)])
cmd.extend(src_locators)
cmd.append(dest_project_uuid)
try:
result = _run_command(cmd)
result["output_files"] = []
return result
except MCPError as e:
return {
"command_executed": " ".join(cmd),
"stdout": "",
"stderr": e.stderr,
"error": e.message,
"output_files": [],
}
@mcp.tool()
def arv_tag(
locator: str,
tags_to_add: Optional[List[str]] = None,
keys_to_remove: Optional[List[str]] = None,
list_tags: bool = False,
num_retries: int = 5,
) -> dict:
"""
Manipulates tags on an Arvados object. It can list, add, or remove tags.
Args:
locator: The UUID or portable data hash (PDH) of the object to tag.
tags_to_add: A list of tags to add, in 'key' or 'key=value' format.
keys_to_remove: A list of tag keys to remove.
list_tags: If True, lists the existing tags on the object.
num_retries: Number of times to retry a failed API call.
Returns:
A dictionary containing the command executed, stdout, and stderr.
"""
cmd = ["arv-tag"]
cmd.extend(["--num-retries", str(num_retries)])
if list_tags:
cmd.append("--list")
cmd.append(locator)
if tags_to_add:
for tag in tags_to_add:
if "=" not in tag and " " in tag:
raise ValueError(f"Invalid tag format: '{tag}'. Use 'key=value' or 'key'.")
cmd.extend(tags_to_add)
if keys_to_remove:
for key in keys_to_remove:
cmd.extend(["--remove", key])
try:
result = _run_command(cmd)
result["output_files"] = []
return result
except MCPError as e:
return {
"command_executed": " ".join(cmd),
"stdout": "",
"stderr": e.stderr,
"error": e.message,
"output_files": [],
}
if __name__ == "__main__":
mcp.run(transport="stdio")
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