135 lines
3.6 KiB
Go
135 lines
3.6 KiB
Go
/*
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* distrohop - A utility for correlating and identifying equivalent software
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* packages across different Linux distributions
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*
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* Copyright (C) 2025 Elara Ivy <elara@elara.ws>
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*
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* This file is part of distrohop.
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*
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* distrohop is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* distrohop is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with distrohop. If not, see <http://www.gnu.org/licenses/>.
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*/
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package combined
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import (
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"errors"
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"fmt"
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"slices"
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"sync"
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"time"
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"github.com/cockroachdb/pebble"
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"go.elara.ws/distrohop/internal/store"
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"golang.org/x/sync/errgroup"
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)
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var _ store.ReadOnly = (*Store)(nil)
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var ErrNotFound = errors.New("no such package")
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// Store represents a combined store that aggregates multiple individual [go.elara.ws/distrohop/internal/store.Store] instances.
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// It implements [go.elara.ws/distrohop/internal/store.ReadOnly].
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type Store struct {
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Stores []store.ReadOnly
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}
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// New creates a new combined store with the provided individual stores.
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func New(stores ...store.ReadOnly) *Store {
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return &Store{stores}
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}
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// Add adds a new store to the combined store.
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func (cs *Store) Add(s store.ReadOnly) {
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cs.Stores = append(cs.Stores, s)
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}
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// GetPkg retrieves a package by name from any of the stores in the combined store.
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// If the package is not found in any store, it returns [github.com/cockroachdb/pebble.ErrNotFound].
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func (cs *Store) GetPkg(name string) (out store.Package, err error) {
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mtx := &sync.Mutex{}
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wg := &errgroup.Group{}
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for _, s := range cs.Stores {
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wg.Go(func() error {
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if pkg, err := s.GetPkg(name); err == nil {
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mtx.Lock()
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out = pkg
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mtx.Unlock()
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} else if !errors.Is(err, pebble.ErrNotFound) {
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return err
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}
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return nil
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})
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}
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if err := wg.Wait(); err != nil {
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return out, err
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} else if out.Name == "" {
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return out, fmt.Errorf("%w: %q", ErrNotFound, name)
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} else {
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return out, nil
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}
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}
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// GetPkgNamesByPrefix retrieves package names that match the given prefix from all stores.
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// It returns a slice of package names limited to the specified number n.
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func (cs *Store) GetPkgNamesByPrefix(prefix string, n int) (out []string, err error) {
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mtx := &sync.Mutex{}
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wg := &errgroup.Group{}
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for _, s := range cs.Stores {
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wg.Go(func() error {
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names, err := s.GetPkgNamesByPrefix(prefix, n)
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if err != nil {
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return err
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}
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mtx.Lock()
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out = append(out, names...)
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mtx.Unlock()
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return nil
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})
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}
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if err := wg.Wait(); err != nil {
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return nil, err
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}
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slices.Sort(out)
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if len(out) > n {
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out = out[:n]
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}
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return out, nil
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}
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// Search searches for packages across all stores based on the provided tags.
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// It returns a slice of search results and an error.
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func (cs *Store) Search(tags []string) (out []store.TagResult, latency time.Duration, err error) {
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mtx := &sync.Mutex{}
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wg := &errgroup.Group{}
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for _, s := range cs.Stores {
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wg.Go(func() error {
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results, dur, err := s.Search(tags)
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if err != nil {
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return err
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}
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mtx.Lock()
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latency += dur
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out = append(out, results...)
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mtx.Unlock()
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return nil
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})
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}
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if err := wg.Wait(); err != nil {
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return nil, latency, err
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} else {
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store.SortResults(out)
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return out, latency, nil
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}
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}
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