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block.go
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block.go
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package asset
import (
"context"
"github.com/lib/pq"
"chain/core/signers"
"chain/database/pg"
"chain/encoding/json"
"chain/errors"
"chain/protocol/bc"
"chain/protocol/vmutil"
)
// A Saver is responsible for saving an annotated asset object
// for indexing and retrieval.
// If the Core is configured not to provide search services,
// SaveAnnotatedAsset can be a no-op.
type Saver interface {
SaveAnnotatedAsset(context.Context, bc.AssetID, map[string]interface{}, string) error
}
func (reg *Registry) indexAnnotatedAsset(ctx context.Context, a *Asset) error {
if reg.indexer == nil {
return nil
}
m := map[string]interface{}{
"id": a.AssetID,
"alias": a.Alias,
"definition": a.Definition,
"issuance_program": json.HexBytes(a.IssuanceProgram),
"tags": a.Tags,
"is_local": "no",
}
if a.Signer != nil {
var keys []map[string]interface{}
path := signers.Path(a.Signer, signers.AssetKeySpace)
var jsonPath []json.HexBytes
for _, p := range path {
jsonPath = append(jsonPath, p)
}
for _, xpub := range a.Signer.XPubs {
derived := xpub.Derive(path)
keys = append(keys, map[string]interface{}{
"root_xpub": xpub,
"asset_pubkey": derived,
"asset_derivation_path": jsonPath,
})
}
m["keys"] = keys
m["quorum"] = a.Signer.Quorum
m["is_local"] = "yes"
} else {
pubkeys, quorum, err := vmutil.ParseP2SPMultiSigProgram(a.IssuanceProgram)
if err == nil {
var keys []map[string]interface{}
for _, pubkey := range pubkeys {
keys = append(keys, map[string]interface{}{
"asset_pubkey": json.HexBytes(pubkey),
})
}
m["keys"] = keys
m["quorum"] = quorum
}
}
return reg.indexer.SaveAnnotatedAsset(ctx, a.AssetID, m, a.sortID)
}
// indexAssets is run on every block and indexes all non-local assets.
func (reg *Registry) indexAssets(ctx context.Context, b *bc.Block) error {
var (
assetIDs, definitions pq.StringArray
issuancePrograms pq.ByteaArray
seen = make(map[bc.AssetID]bool)
)
for _, tx := range b.Transactions {
for _, in := range tx.Inputs {
if !in.IsIssuance() {
continue
}
if seen[in.AssetID()] {
continue
}
definition, err := definitionFromProgram(in.IssuanceProgram())
if err != nil {
continue
}
seen[in.AssetID()] = true
assetIDs = append(assetIDs, in.AssetID().String())
definitions = append(definitions, string(definition))
issuancePrograms = append(issuancePrograms, in.IssuanceProgram())
}
}
if len(assetIDs) == 0 {
return nil
}
// Insert these assets into the database. If the asset already exists, don't
// do anything. Return the asset ID of all inserted assets so we know which
// ones we have to save to the query indexer.
//
// For idempotency concerns, we use `first_block_height` to ensure that this
// query always returns the full set of new assets at this block. This
// protects against a crash after inserting into `assets` but before saving
// the annotated asset to the query indexer.
const q = `
WITH new_assets AS (
INSERT INTO assets (id, issuance_program, definition, created_at, initial_block_hash, first_block_height)
VALUES(unnest($1::text[]), unnest($2::bytea[]), unnest($3::text[])::jsonb, $4, $5, $6)
ON CONFLICT (id) DO NOTHING
RETURNING id
)
SELECT id FROM new_assets
UNION
SELECT id FROM assets WHERE first_block_height = $6
`
var newAssetIDs []bc.AssetID
err := pg.ForQueryRows(ctx, reg.db, q, assetIDs, issuancePrograms, definitions, b.Time(), reg.initialBlockHash, b.Height,
func(assetID bc.AssetID) { newAssetIDs = append(newAssetIDs, assetID) })
if err != nil {
return errors.Wrap(err, "error indexing non-local assets")
}
// newAssetIDs now contains only the asset IDs of new, non-local
// assets. We need to index them as annotated assets too.
for _, assetID := range newAssetIDs {
// TODO(jackson): Batch the asset lookups.
a, err := reg.findByID(ctx, assetID)
if err != nil {
return errors.Wrap(err, "looking up new asset")
}
err = reg.indexAnnotatedAsset(ctx, a)
if err != nil {
return errors.Wrap(err, "indexing annotated asset")
}
}
return nil
}