# Copyright (C) 2020 The Software Heritage developers # See the AUTHORS file at the top-level directory of this distribution # License: GNU General Public License version 3, or any later version # See top-level LICENSE file for more information import base64 import os import os.path import shlex import subprocess import tempfile from typing import Tuple from swh.dataset.exporter import ExporterDispatch from swh.dataset.utils import ZSTFile, remove_pull_requests from swh.model.hashutil import hash_to_hex from swh.model.model import Origin from swh.model.swhids import ExtendedObjectType def swhid(object_type, object_id): # We use string interpolation here instead of using ExtendedSWHID to format, # as building temporary ExtendedSWHID objects has a non-negligeable impact # on performance. return f"swh:1:{object_type.value}:{hash_to_hex(object_id)}" class GraphEdgesExporter(ExporterDispatch): """ Implementation of an exporter which writes all the graph edges of a specific type to a Zstandard-compressed CSV file. Each row of the CSV is in the format: `` ``. """ def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.writers = {} def get_writers_for(self, obj_type: ExtendedObjectType): if obj_type not in self.writers: dataset_path = self.export_path / obj_type.name.lower() dataset_path.mkdir(exist_ok=True) unique_id = self.get_unique_file_id() nodes_file = dataset_path / ("graph-{}.nodes.csv.zst".format(unique_id)) edges_file = dataset_path / ("graph-{}.edges.csv.zst".format(unique_id)) node_writer = self.exit_stack.enter_context(ZSTFile(str(nodes_file), "w")) edge_writer = self.exit_stack.enter_context(ZSTFile(str(edges_file), "w")) self.writers[obj_type] = (node_writer, edge_writer) return self.writers[obj_type] def get_node_writer_for(self, obj_type: ExtendedObjectType): return self.get_writers_for(obj_type)[0] def get_edge_writer_for(self, obj_type: ExtendedObjectType): return self.get_writers_for(obj_type)[1] def write_node(self, node: Tuple[ExtendedObjectType, bytes]): node_type, node_id = node if node_id is None: return node_swhid = swhid(object_type=node_type, object_id=node_id) node_writer = self.get_node_writer_for(node_type) node_writer.write("{}\n".format(node_swhid)) def write_edge( self, src: Tuple[ExtendedObjectType, bytes], dst: Tuple[ExtendedObjectType, bytes], *, labels=None, ): src_type, src_id = src dst_type, dst_id = dst if src_id is None or dst_id is None: return src_swhid = swhid(object_type=src_type, object_id=src_id) dst_swhid = swhid(object_type=dst_type, object_id=dst_id) edge_line = " ".join([src_swhid, dst_swhid] + (labels if labels else [])) edge_writer = self.get_edge_writer_for(src_type) edge_writer.write("{}\n".format(edge_line)) def process_origin(self, origin): origin_id = Origin(url=origin["url"]).id self.write_node((ExtendedObjectType.ORIGIN, origin_id)) def process_origin_visit_status(self, visit_status): origin_id = Origin(url=visit_status["origin"]).id self.write_edge( (ExtendedObjectType.ORIGIN, origin_id), (ExtendedObjectType.SNAPSHOT, visit_status["snapshot"]), ) def process_snapshot(self, snapshot): if self.config.get("remove_pull_requests"): remove_pull_requests(snapshot) self.write_node((ExtendedObjectType.SNAPSHOT, snapshot["id"])) for branch_name, branch in snapshot["branches"].items(): original_branch_name = branch_name while branch and branch.get("target_type") == "alias": branch_name = branch["target"] branch = snapshot["branches"].get(branch_name) if branch is None or not branch_name: continue self.write_edge( (ExtendedObjectType.SNAPSHOT, snapshot["id"]), (ExtendedObjectType[branch["target_type"].upper()], branch["target"]), labels=[ base64.b64encode(original_branch_name).decode(), ], ) def process_release(self, release): self.write_node((ExtendedObjectType.RELEASE, release["id"])) self.write_edge( (ExtendedObjectType.RELEASE, release["id"]), (ExtendedObjectType[release["target_type"].upper()], release["target"]), ) def process_revision(self, revision): self.write_node((ExtendedObjectType.REVISION, revision["id"])) self.write_edge( (ExtendedObjectType.REVISION, revision["id"]), (ExtendedObjectType.DIRECTORY, revision["directory"]), ) for parent in revision["parents"]: self.write_edge( (ExtendedObjectType.REVISION, revision["id"]), (ExtendedObjectType.REVISION, parent), ) def process_directory(self, directory): self.write_node((ExtendedObjectType.DIRECTORY, directory["id"])) for entry in directory["entries"]: entry_type_mapping = { "file": ExtendedObjectType.CONTENT, "dir": ExtendedObjectType.DIRECTORY, "rev": ExtendedObjectType.REVISION, } self.write_edge( (ExtendedObjectType.DIRECTORY, directory["id"]), (entry_type_mapping[entry["type"]], entry["target"]), labels=[base64.b64encode(entry["name"]).decode(), str(entry["perms"])], ) def process_content(self, content): self.write_node((ExtendedObjectType.CONTENT, content["sha1_git"])) def sort_graph_nodes(export_path, config): """ Generate the node list from the edges files. We cannot solely rely on the object IDs that are read in the journal, as some nodes that are referred to as destinations in the edge file might not be present in the archive (e.g a rev_entry referring to a revision that we do not have crawled yet). The most efficient way of getting all the nodes that are mentioned in the edges file is therefore to use sort(1) on the gigantic edge files to get all the unique node IDs, while using the disk as a temporary buffer. This pipeline does, in order: - concatenate and write all the compressed edges files in graph.edges.csv.zst (using the fact that ZST compression is an additive function) ; - deflate the edges ; - count the number of edges and write it in graph.edges.count.txt ; - count the number of occurrences of each edge type and write them in graph.edges.stats.txt ; - concatenate all the (deflated) nodes from the export with the destination edges, and sort the output to get the list of unique graph nodes ; - count the number of unique graph nodes and write it in graph.nodes.count.txt ; - count the number of occurrences of each node type and write them in graph.nodes.stats.txt ; - compress and write the resulting nodes in graph.nodes.csv.zst. """ # Use awk as a replacement of `sort | uniq -c` to avoid buffering everything # in memory counter_command = "awk '{ t[$0]++ } END { for (i in t) print i,t[i] }'" sort_script = """ pv {export_path}/*/*.edges.csv.zst | tee {export_path}/graph.edges.csv.zst | zstdcat | tee >( wc -l > {export_path}/graph.edges.count.txt ) | tee >( cut -d: -f3,6 | {counter_command} | sort \ > {export_path}/graph.edges.stats.txt ) | tee >( cut -d' ' -f3 | grep . | \ sort -u -S{sort_buffer_size} -T{buffer_path} | \ zstdmt > {export_path}/graph.labels.csv.zst ) | cut -d' ' -f2 | cat - <( zstdcat {export_path}/*/*.nodes.csv.zst ) | sort -u -S{sort_buffer_size} -T{buffer_path} | tee >( wc -l > {export_path}/graph.nodes.count.txt ) | tee >( cut -d: -f3 | {counter_command} | sort \ > {export_path}/graph.nodes.stats.txt ) | zstdmt > {export_path}/graph.nodes.csv.zst """ # Use bytes for the sorting algorithm (faster than being locale-specific) env = { **os.environ.copy(), "LC_ALL": "C", "LC_COLLATE": "C", "LANG": "C", } sort_buffer_size = config.get("sort_buffer_size", "4G") disk_buffer_dir = config.get("disk_buffer_dir", export_path) with tempfile.TemporaryDirectory( prefix=".graph_node_sort_", dir=disk_buffer_dir ) as buffer_path: subprocess.run( [ "bash", "-c", sort_script.format( export_path=shlex.quote(str(export_path)), buffer_path=shlex.quote(str(buffer_path)), sort_buffer_size=shlex.quote(sort_buffer_size), counter_command=counter_command, ), ], env=env, )