From 8b132461c9e9f85e61c520f2f576144a6f6e06ac Mon Sep 17 00:00:00 2001
From: Bryan Newbold <bnewbold@robocracy.org>
Date: Thu, 5 Sep 2019 18:41:30 -0700
Subject: first iteration of mergers

---
 python/fatcat_merge.py                  | 112 +++++++++++++++++++++++++++
 python/fatcat_tools/mergers/__init__.py |   3 +
 python/fatcat_tools/mergers/common.py   | 130 ++++++++++++++++++++++++++++++++
 python/fatcat_tools/mergers/releases.py | 110 +++++++++++++++++++++++++++
 4 files changed, 355 insertions(+)
 create mode 100755 python/fatcat_merge.py
 create mode 100644 python/fatcat_tools/mergers/__init__.py
 create mode 100644 python/fatcat_tools/mergers/common.py
 create mode 100644 python/fatcat_tools/mergers/releases.py

diff --git a/python/fatcat_merge.py b/python/fatcat_merge.py
new file mode 100755
index 00000000..7b0ae63b
--- /dev/null
+++ b/python/fatcat_merge.py
@@ -0,0 +1,112 @@
+#!/usr/bin/env python3
+
+"""
+Tools for merging entities in various ways.
+
+    group-releases: pull all release entities under a single work
+        => merges work entities
+    merge-releases: merge release entities together
+        => groups files/filesets/webcaptures
+    merge-containers: merge container entities
+    merge-files: merge file entities
+
+Input format is usually JSON lines with keys:
+
+    idents (required): array of string identifiers
+    primary (optional): single string identifier
+
+"""
+
+import os, sys, argparse
+from fatcat_tools import authenticated_api
+from fatcat_tools.mergers import *
+from fatcat_tools.importers import JsonLinePusher
+
+
+def run_group_releases(args):
+    rg = ReleaseGrouper(args.api,
+        edit_batch_size=args.batch_size,
+        dry_run_mode=args.dry_run)
+    JsonLinePusher(rg, args.json_file).run()
+
+def run_merge_releases(args):
+    rm = ReleaseMerger(args.api,
+        edit_batch_size=args.batch_size,
+        dry_run_mode=args.dry_run)
+    JsonLinePusher(rg, args.json_file).run()
+
+def run_merge_containers(args):
+    cm = ReleaseMerger(args.api,
+        edit_batch_size=args.batch_size,
+        dry_run_mode=args.dry_run)
+    JsonLinePusher(cm, args.json_file).run()
+
+def run_merge_files(args):
+    fm = FileMerger(args.api,
+        edit_batch_size=args.batch_size,
+        dry_run_mode=args.dry_run)
+    JsonLinePusher(fm, args.json_file).run()
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('--host-url',
+        default="http://localhost:9411/v0",
+        help="connect to this host/port")
+    parser.add_argument('--batch-size',
+        help="size of batch to send",
+        default=50, type=int)
+    parser.add_argument('--editgroup-description-override',
+        help="editgroup description override",
+        default=None, type=str)
+    parser.add_argument('--dry-run',
+        action='store_true',
+        help="don't actually commit merges, just count what would have been")
+    parser.set_defaults(
+        auth_var="FATCAT_AUTH_API_TOKEN",
+    )
+    subparsers = parser.add_subparsers()
+
+    sub_group_releases = subparsers.add_parser('group-releases')
+    sub_group_releases.set_defaults(func=run_group_releases)
+    sub_group_releases.add_argument('json_file',
+        help="source of merge lines to process (or stdin)",
+        default=sys.stdin, type=argparse.FileType('r'))
+
+    sub_merge_releases = subparsers.add_parser('merge-releases')
+    sub_merge_releases.set_defaults(func=run_merge_releases)
+    sub_merge_releases.add_argument('json_file',
+        help="source of merge lines to process (or stdin)",
+        default=sys.stdin, type=argparse.FileType('r'))
+
+    sub_merge_files = subparsers.add_parser('merge-files')
+    sub_merge_files.set_defaults(func=run_merge_files)
+    sub_merge_files.add_argument('json_file',
+        help="source of merge lines to process (or stdin)",
+        default=sys.stdin, type=argparse.FileType('r'))
+
+    sub_merge_containers = subparsers.add_parser('merge-containers')
+    sub_merge_containers.set_defaults(func=run_merge_containers)
+    sub_merge_containers.add_argument('json_file',
+        help="source of merge lines to process (or stdin)",
+        default=sys.stdin, type=argparse.FileType('r'))
+
+    args = parser.parse_args()
+    if not args.__dict__.get("func"):
+        print("tell me what to do!")
+        sys.exit(-1)
+
+    # allow editgroup description override via env variable (but CLI arg takes
+    # precedence)
+    if not args.editgroup_description_override \
+            and os.environ.get('FATCAT_EDITGROUP_DESCRIPTION'):
+        args.editgroup_description_override = os.environ.get('FATCAT_EDITGROUP_DESCRIPTION')
+
+    args.api = authenticated_api(
+        args.host_url,
+        # token is an optional kwarg (can be empty string, None, etc)
+        token=os.environ.get(args.auth_var))
+    args.func(args)
+
+if __name__ == '__main__':
+    main()
diff --git a/python/fatcat_tools/mergers/__init__.py b/python/fatcat_tools/mergers/__init__.py
new file mode 100644
index 00000000..c38a397d
--- /dev/null
+++ b/python/fatcat_tools/mergers/__init__.py
@@ -0,0 +1,3 @@
+
+from .common import EntityMerger
+from .releases import ReleaseMerger, ReleaseGrouper
diff --git a/python/fatcat_tools/mergers/common.py b/python/fatcat_tools/mergers/common.py
new file mode 100644
index 00000000..62a29c42
--- /dev/null
+++ b/python/fatcat_tools/mergers/common.py
@@ -0,0 +1,130 @@
+
+"""
+Tools for merging entities in various ways.
+
+    group-releases: pull all release entities under a single work
+        => merges work entities
+    merge-releases: merge release entities together
+        => groups files/filesets/webcaptures
+    merge-containers: merge container entities
+    merge-files: merge file entities
+
+Input format is JSON lines with keys:
+
+    idents (required): array of string identifiers
+    primary (optional): single string identifier
+
+"""
+
+import subprocess
+from collections import Counter
+
+import fatcat_api_client
+from fatcat_api_client.rest import ApiException
+
+
+class EntityMerger:
+    """
+    API for individual jobs:
+
+        # record iterators sees
+        push_record(raw_record)
+        finish()
+
+        # provided helpers
+        self.api
+        self.get_editgroup_id()
+        counts({'lines', 'skip', 'merged', 'updated'})
+
+        # implemented per-task
+        try_merge(idents, primary=None) -> int (entities updated)
+
+    This class is pretty similar to EntityImporter, but isn't subclassed.
+    """
+
+    def __init__(self, api, **kwargs):
+
+        eg_extra = kwargs.get('editgroup_extra', dict())
+        eg_extra['git_rev'] = eg_extra.get('git_rev',
+            subprocess.check_output(["git", "describe", "--always"]).strip()).decode('utf-8')
+        eg_extra['agent'] = eg_extra.get('agent', 'fatcat_tools.EntityMerger')
+
+        self.api = api
+        self.dry_run_mode = kwargs.get('dry_run_mode', True)
+        self.edit_batch_size = kwargs.get('edit_batch_size', 50)
+        self.editgroup_description = kwargs.get('editgroup_description')
+        self.editgroup_extra = eg_extra
+        self.reset()
+
+        if self.dry_run_mode:
+            print("Running in dry-run mode!")
+
+    def reset(self):
+        self.counts = Counter({'lines': 0, 'skip': 0, 'merged': 0, 'updated-total': 0})
+        self._edit_count = 0
+        self._editgroup_id = None
+        self._entity_queue = []
+        self._idents_inflight = []
+
+    def push_record(self, line):
+        """
+        Intended to be called by "pusher" class (which could be pulling from
+        JSON file, Kafka, whatever).
+
+        Input is expected to be a dict-like object with key "idents", and
+        optionally "primary".
+
+        Returns nothing.
+        """
+        self.counts['lines'] += 1
+        if (not raw_record):
+            self.counts['skip'] += 1
+            return
+        primary = line.get('primary')
+        idents = list(set(line.get('idents')))
+        if primary and primary not in idents:
+            idents.append(primary)
+        if not idents or len(idents) <= 1:
+            self.counts['skip'] += 1
+            return
+        for i in idents:
+            if i in self._idents_inflight:
+                raise ValueError("Entity already part of in-process merge operation: {}".format(i))
+            self._idents.inflight.append(i)
+        count = self.try_merge(idents, primary=primary)
+        if count:
+            self.counts['merged'] += 1
+            self.counts['updated-total'] += count
+            self._edit_count += count
+        else:
+            self.counts['skip'] += 1
+        if self._edit_count >= self.edit_batch_size:
+            self.api.accept_editgroup(self._editgroup_id)
+            self._editgroup_id = None
+            self._edit_count = 0
+            self._idents_inflight = []
+        return
+
+    def try_merge(self, idents, primary=None):
+        # implementations should fill this in
+        raise NotImplementedError
+
+    def finish(self):
+        if self._edit_count > 0:
+            self.api.accept_editgroup(self._editgroup_id)
+            self._editgroup_id = None
+            self._edit_count = 0
+            self._idents_inflight = []
+
+        return self.counts
+
+    def get_editgroup_id(self):
+
+        if not self._editgroup_id:
+            eg = self.api.create_editgroup(
+                fatcat_api_client.Editgroup(
+                    description=self.editgroup_description,
+                    extra=self.editgroup_extra))
+            self._editgroup_id = eg.editgroup_id
+
+        return self._editgroup_id
diff --git a/python/fatcat_tools/mergers/releases.py b/python/fatcat_tools/mergers/releases.py
new file mode 100644
index 00000000..802cb8da
--- /dev/null
+++ b/python/fatcat_tools/mergers/releases.py
@@ -0,0 +1,110 @@
+
+from .common import EntityMerger
+from fatcat_api_client.models import ReleaseEntity, WorkEntity
+
+
+class ReleaseMerger(EntityMerger):
+    """
+    Hard merges a set of release entities, redirecting all entities to a single
+    primary release.
+
+    Will also redirect works (if appropriate), and re-point {files, filesets,
+    webcaptures} to the new merged release.
+    """
+
+    def __init__(self, api, **kwargs):
+
+        eg_desc = kwargs.get('editgroup_description',
+            "Automated merge of release entities")
+        eg_extra = kwargs.get('editgroup_extra', dict())
+        eg_extra['agent'] = eg_extra.get('agent', 'fatcat_tools.ReleaseMerger')
+        super().__init__(api,
+            editgroup_description=eg_desc,
+            editgroup_extra=eg_extra,
+            **kwargs)
+
+    def try_merge(self, idents, primary=None):
+
+        updated_entities = 0
+        releases = dict()
+        eg_id = self.get_editgroup_id()
+
+        self.dry_run_mode
+
+        for ident in idents:
+            releases[ident] = api.get_release(ident, expand="files,filesets,webcaptures")
+
+        # select the primary (if not already set)
+        if not primary:
+            primary = releases.keys()[0]
+
+        primary_work_id = releases[primary].work_id
+        updated_work_ids = []
+        redirected_release_ids = []
+
+        # execute all the release redirects
+        for release in releases.values():
+            if release.ident == primary:
+                continue
+
+            # file redirects
+            for e in release.files:
+                e.release_ids.remove(release.ident)
+                if not primary in e.release_ids:
+                    e.release_ids.append(primary)
+                if not self.dry_run_mode:
+                    api.update_file(eg_id, e.ident, e)
+                updated_entities += 1
+                self.counts['updated-files'] += 1
+
+            # fileset redirects
+            for e in release.filesets:
+                e.release_ids.remove(release.ident)
+                if not primary in e.release_ids:
+                    e.release_ids.append(primary)
+                if not self.dry_run_mode:
+                    api.update_fileset(eg_id, e.ident, e)
+                updated_entities += 1
+                self.counts['updated-filesets'] += 1
+
+            # webcapture redirects
+            for e in release.webcaptures:
+                e.release_ids.remove(release.ident)
+                if not primary in e.release_ids:
+                    e.release_ids.append(primary)
+                if not self.dry_run_mode:
+                    api.update_webcapture(eg_id, e.ident, e)
+                updated_entities += 1
+                self.counts['updated-webcaptures'] += 1
+
+            # release redirect itself
+            updated_work_ids.append(release.work_id)
+            redirected_release_ids.append(release.ident)
+            if not self.dry_run_mode:
+                api.update_release(eg_id, release.ident, ReleaseEntity(redirect=primary))
+            updated_entities += 1
+            self.counts['updated-releases']
+
+
+        # lastly, clean up any merged work entities
+        redirected_release_ids = set(redirected_release_ids)
+        updated_work_ids = list(set(updated_work_ids))
+        assert primary_work_id not in updated_work_ids
+        for work_id in updated_work_ids:
+            work_releases = api.get_work_releases(work_id)
+            rids = set([r.ident for r in work_releases])
+            if rids.issubset(redirected_release_ids):
+                # all the releases for this work were updated/merged; we should
+                # redirect to primary work_id
+                # also check we don't have any in-flight edit conflicts
+                assert not work_id in self._idents_inflight
+                self._idents_inflight.append(work_id)
+                if not self.dry_run_mode:
+                    api.update_work(eg_id, work_id, WorkEntity(redirect=primary_work_id))
+                updated_entities += 1
+                self.counts['updated-works'] += 1
+
+        return updated_entities
+
+class ReleaseGrouper(EntityMerger):
+    pass
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