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Merge pull request #7 from libsv/feature/spv
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,13 @@ | ||
| package bc | ||
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|
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| // MapiCallback is the body contents posted to the provided callback url from Merchant API | ||
| type MapiCallback struct { | ||
| CallbackPayload string `json:"callbackPayload"` | ||
| APIVersion string `json:"apiVersion"` | ||
| Timestamp string `json:"timestamp"` | ||
| MinerID string `json:"minerId"` | ||
| BlockHash string `json:"blockHash"` | ||
| BlockHeight uint64 `json:"blockHeight"` | ||
| CallbackTxID string `json:"callbackTxId"` | ||
| CallbackReason string `json:"callbackReason"` | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,68 @@ | ||
| package spv | ||
|
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| import ( | ||
| "context" | ||
| "fmt" | ||
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| "github.com/libsv/go-bt/v2" | ||
| "github.com/pkg/errors" | ||
| ) | ||
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| // CreateEnvelope builds and returns an spv.Envelope for the provided tx. | ||
| func (c *creator) CreateEnvelope(ctx context.Context, tx *bt.Tx) (*Envelope, error) { | ||
| if len(tx.Inputs) == 0 { | ||
| return nil, ErrNoTxInputs | ||
| } | ||
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| envelope := &Envelope{ | ||
| TxID: tx.TxID(), | ||
| RawTx: tx.String(), | ||
| Parents: make(map[string]*Envelope), | ||
| } | ||
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| for _, input := range tx.Inputs { | ||
| pTxID := input.PreviousTxIDStr() | ||
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| // If we already have added the tx to the parent envelope, there's no point in | ||
| // redoing the same work | ||
| if _, ok := envelope.Parents[pTxID]; ok { | ||
| continue | ||
| } | ||
|
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| // Check the store for a Merkle Proof for the current input. | ||
| mp, err := c.mpc.MerkleProof(ctx, pTxID) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to get merkle proof for tx %s", pTxID) | ||
| } | ||
| if mp != nil { | ||
| // If a Merkle Proof exists, build and return an spv.Envelope | ||
| envelope.Parents[pTxID] = &Envelope{ | ||
| TxID: pTxID, | ||
| Proof: mp, | ||
| } | ||
|
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| // Skip getting the tx data as we have everything we need for verifying the current tx. | ||
| continue | ||
| } | ||
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| // If no merkle proof was found for the input, build a *bt.Tx from its TxID and recursively | ||
| // call this function building envelopes for inputs without proofs, until a parent with a | ||
| // Merkle Proof is found. | ||
| pTx, err := c.txc.Tx(ctx, pTxID) | ||
| if err != nil { | ||
| return nil, errors.Wrapf(err, "failed to get tx %s", pTxID) | ||
| } | ||
| if pTx == nil { | ||
| return nil, fmt.Errorf("could not find tx %s", pTxID) | ||
| } | ||
|
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| pEnvelope, err := c.CreateEnvelope(ctx, pTx) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| envelope.Parents[pTxID] = pEnvelope | ||
| } | ||
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| return envelope, nil | ||
| } |
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