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sources.go
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sources.go
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package bpm
import (
"context"
"database/sql"
"errors"
"path"
"strings"
"time"
"github.com/brendoncarroll/go-exp/streams"
"github.com/brendoncarroll/stdctx/logctx"
"github.com/itchyny/gojq"
"github.com/jmoiron/sqlx"
"golang.org/x/sync/errgroup"
"github.com/blobcache/bpm/bpmmd"
"github.com/blobcache/bpm/internal/dbutil"
"github.com/blobcache/bpm/internal/sqlstores"
"github.com/blobcache/bpm/sources"
"github.com/blobcache/bpm/sources/github"
"github.com/blobcache/bpm/sources/httpscrape"
)
// MakeSource creates a new source from a URL
func MakeSource(u sources.URL) (sources.Source, error) {
switch u.Scheme {
case "github":
parts := strings.SplitN(u.Path, "/", 2)
return github.NewGitHubSource(parts[0], parts[1]), nil
case "http":
s, err := httpscrape.NewHTTPScraper(u.Path)
return s, err
default:
return nil, errors.New("unrecognized URL scheme")
}
}
// UpstreamURL uniquely identifies a remote asset
type UpstreamURL struct {
sources.URL
ID string `json:"id"`
}
func (u UpstreamURL) String() string {
return path.Join(u.URL.String(), u.ID)
}
// Fetch creates metadata-only assets for all of assets in the source.
func (r *Repo) Fetch(ctx context.Context, srcURL sources.URL) error {
src, err := MakeSource(srcURL)
if err != nil {
return err
}
it, err := src.Fetch(ctx)
if err != nil {
return err
}
eg, ctx := errgroup.WithContext(ctx)
results := make(chan sources.RemoteAsset)
eg.Go(func() error {
defer close(results)
return streams.LoadChan(ctx, it, results)
})
eg.Go(func() error {
const batchSize = 1000
const timeout = 100 * time.Millisecond
it := streams.NewBatcher[sources.RemoteAsset](streams.Chan[sources.RemoteAsset](results), batchSize, timeout)
return streams.ForEach[[]sources.RemoteAsset](ctx, it, func(xs []sources.RemoteAsset) error {
return dbutil.DoTx(ctx, r.db, func(tx *sqlx.Tx) error {
for _, x := range xs {
assetID, err := getOrCreateUpstream(tx, srcURL.Scheme, srcURL.Path, x.ID)
if err != nil {
return err
}
if err := putLabelSet(tx, assetID, x.Labels); err != nil {
return err
}
}
return nil
})
})
})
return eg.Wait()
}
func (r *Repo) FetchAll(ctx context.Context) error {
var rows []struct {
Scheme string `db:"scheme"`
Path string `db:"path"`
}
if err := r.db.SelectContext(ctx, &rows, `SELECT distinct scheme, path FROM upstreams`); err != nil {
return err
}
var eg errgroup.Group
eg.SetLimit(10)
for _, row := range rows {
u := sources.URL{
Scheme: row.Scheme,
Path: row.Path,
}
logctx.Infof(ctx, "fetching asset metadata from %v", u)
eg.Go(func() error {
return r.Fetch(ctx, u)
})
}
return eg.Wait()
}
// Pull pulls the content for an asset from source
func (r *Repo) Pull(ctx context.Context, u sources.URL, idstr string) (uint64, error) {
src, err := MakeSource(u)
if err != nil {
return 0, err
}
aid, err := dbutil.DoTx1(ctx, r.db, func(tx *sqlx.Tx) (uint64, error) {
return getOrCreateUpstream(tx, u.Scheme, u.Path, idstr)
})
if err != nil {
return 0, err
}
sid, err := dbutil.DoTx1(ctx, r.db, func(tx *sqlx.Tx) (uint64, error) { return getAssetStore(tx, aid) })
if err != nil {
return 0, err
}
s := sqlstores.NewStore(r.db, Hash, MaxBlobSize, sid)
ref, err := src.Pull(ctx, &r.glfsOp, s, idstr)
if err != nil {
return 0, err
}
if err := dbutil.DoTx(ctx, r.db, func(tx *sqlx.Tx) error { return putAssetRef(tx, aid, *ref) }); err != nil {
return 0, err
}
return aid, nil
}
// Search searches locally cached remote assets for a source.
// To search assets originating locally pass nil for srcURL
func (r *Repo) ListAssetsBySource(ctx context.Context, srcURL *sources.URL, code *gojq.Code) ([]Asset, error) {
qstr := `SELECT assets.id FROM assets
JOIN asset_labels ON asset_labels.asset_id = assets.id
JOIN upstreams ON upstreams.asset_id = assets.id
`
var args []any
if srcURL != nil {
qstr += " WHERE upstreams.scheme = ? AND upstreams.path = ?"
args = append(args, srcURL.Scheme, srcURL.Path)
} else {
qstr += " WHERE assets.upstream_id IS NULL"
}
var fromDB []uint64
if err := r.db.SelectContext(ctx, &fromDB, qstr, args...); err != nil {
return nil, err
}
eg, ctx := errgroup.WithContext(ctx)
unfiltered := make(chan Asset)
eg.Go(func() error {
defer close(unfiltered)
for _, aid := range fromDB {
a, err := r.GetAsset(ctx, aid)
if err != nil {
return err
}
select {
case <-ctx.Done():
return ctx.Err()
case unfiltered <- a:
}
}
return nil
})
var ret []Asset
eg.Go(func() error {
in := streams.Chan[Asset](unfiltered)
it := bpmmd.NewJQFilter[Asset](in, code, func(x Asset) bpmmd.LabelSet {
return x.Labels
})
var err error
ret, err = streams.Collect[Asset](ctx, it, 1e9)
return err
})
if err := eg.Wait(); err != nil {
return nil, err
}
return ret, nil
}
// getOrCreateUpstream returns the asset for a given upstream
func getOrCreateUpstream(tx *sqlx.Tx, scheme, path, remoteID string) (ret uint64, _ error) {
err := tx.Get(&ret, `SELECT asset_id FROM upstreams WHERE scheme = ? AND path = ? AND remote_id = ?`, scheme, path, remoteID)
if errors.Is(err, sql.ErrNoRows) {
sid, err := sqlstores.CreateStore(tx)
if err != nil {
return 0, err
}
aid, err := createAsset(tx, sid)
if err != nil {
return 0, err
}
if _, err := tx.Exec(`INSERT INTO upstreams (scheme, path, remote_id, asset_id) VALUES (?, ?, ?, ?)`, scheme, path, remoteID, aid); err != nil {
return 0, err
}
return aid, nil
}
return ret, err
}
func lookupUpstream(tx *sqlx.Tx, aid uint64) (*UpstreamURL, error) {
var row struct {
Scheme string `db:"scheme"`
Path string `db:"path"`
RemoteID string `db:"remote_id"`
}
if err := tx.Get(&row, `SELECT scheme, path, remote_id FROM upstreams WHERE asset_id = ?`, aid); err != nil {
if errors.Is(err, sql.ErrNoRows) {
return nil, nil
}
return nil, err
}
return &UpstreamURL{
URL: sources.URL{
Scheme: row.Scheme,
Path: row.Path,
},
ID: row.RemoteID,
}, nil
}