forked from NebulousLabs/Sia
/
explorer.go
360 lines (322 loc) · 13.4 KB
/
explorer.go
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package api
import (
"fmt"
"net/http"
"github.com/NebulousLabs/Sia/build"
"github.com/NebulousLabs/Sia/crypto"
"github.com/NebulousLabs/Sia/modules"
"github.com/NebulousLabs/Sia/types"
"github.com/julienschmidt/httprouter"
)
type (
// ExplorerBlock is a block with some extra information such as the id and
// height. This information is provided for programs that may not be
// complex enough to compute the ID on their own.
ExplorerBlock struct {
MinerPayoutIDs []types.SiacoinOutputID `json:"minerpayoutids"`
Transactions []ExplorerTransaction `json:"transactions"`
RawBlock types.Block `json:"rawblock"`
modules.BlockFacts
}
// ExplorerTransaction is a transcation with some extra information such as
// the parent block. This information is provided for programs that may not
// be complex enough to compute the extra information on their own.
ExplorerTransaction struct {
ID types.TransactionID `json:"id"`
Height types.BlockHeight `json:"height"`
Parent types.BlockID `json:"parent"`
RawTransaction types.Transaction `json:"rawtransaction"`
SiacoinInputOutputs []types.SiacoinOutput `json:"siacoininputoutputs"` // the outputs being spent
SiacoinOutputIDs []types.SiacoinOutputID `json:"siacoinoutputids"`
FileContractIDs []types.FileContractID `json:"filecontractids"`
FileContractValidProofOutputIDs [][]types.SiacoinOutputID `json:"filecontractvalidproofoutputids"` // outer array is per-contract
FileContractMissedProofOutputIDs [][]types.SiacoinOutputID `json:"filecontractmissedproofoutputids"` // outer array is per-contract
FileContractRevisionValidProofOutputIDs [][]types.SiacoinOutputID `json:"filecontractrevisionvalidproofoutputids"` // outer array is per-revision
FileContractRevisionMissedProofOutputIDs [][]types.SiacoinOutputID `json:"filecontractrevisionmissedproofoutputids"` // outer array is per-revision
StorageProofOutputIDs [][]types.SiacoinOutputID `json:"storageproofoutputids"` // outer array is per-payout
StorageProofOutputs [][]types.SiacoinOutput `json:"storageproofoutputs"` // outer array is per-payout
SiafundInputOutputs []types.SiafundOutput `json:"siafundinputoutputs"` // the outputs being spent
SiafundOutputIDs []types.SiafundOutputID `json:"siafundoutputids"`
SiafundClaimOutputIDs []types.SiacoinOutputID `json:"siafundclaimoutputids"`
}
// ExplorerGET is the object returned as a response to a GET request to
// /explorer.
ExplorerGET struct {
modules.BlockFacts
}
// ExplorerBlockGET is the object returned by a GET request to
// /explorer/block.
ExplorerBlockGET struct {
Block ExplorerBlock `json:"block"`
}
// ExplorerHashGET is the object returned as a response to a GET request to
// /explorer/hash. The HashType will indicate whether the hash corresponds
// to a block id, a transaction id, a siacoin output id, a file contract
// id, or a siafund output id. In the case of a block id, 'Block' will be
// filled out and all the rest of the fields will be blank. In the case of
// a transaction id, 'Transaction' will be filled out and all the rest of
// the fields will be blank. For everything else, 'Transactions' and
// 'Blocks' will/may be filled out and everything else will be blank.
ExplorerHashGET struct {
HashType string `json:"hashtype"`
Block ExplorerBlock `json:"block"`
Blocks []ExplorerBlock `json:"blocks"`
Transaction ExplorerTransaction `json:"transaction"`
Transactions []ExplorerTransaction `json:"transactions"`
}
)
// buildExplorerTransaction takes a transaction and the height + id of the
// block it appears in an uses that to build an explorer transaction.
func (api *API) buildExplorerTransaction(height types.BlockHeight, parent types.BlockID, txn types.Transaction) (et ExplorerTransaction) {
// Get the header information for the transaction.
et.ID = txn.ID()
et.Height = height
et.Parent = parent
et.RawTransaction = txn
// Add the siacoin outputs that correspond with each siacoin input.
for _, sci := range txn.SiacoinInputs {
sco, exists := api.explorer.SiacoinOutput(sci.ParentID)
if build.DEBUG && !exists {
panic("could not find corresponding siacoin output")
}
et.SiacoinInputOutputs = append(et.SiacoinInputOutputs, sco)
}
for i := range txn.SiacoinOutputs {
et.SiacoinOutputIDs = append(et.SiacoinOutputIDs, txn.SiacoinOutputID(uint64(i)))
}
// Add all of the valid and missed proof ids as extra data to the file
// contracts.
for i, fc := range txn.FileContracts {
fcid := txn.FileContractID(uint64(i))
var fcvpoids []types.SiacoinOutputID
var fcmpoids []types.SiacoinOutputID
for j := range fc.ValidProofOutputs {
fcvpoids = append(fcvpoids, fcid.StorageProofOutputID(types.ProofValid, uint64(j)))
}
for j := range fc.MissedProofOutputs {
fcmpoids = append(fcmpoids, fcid.StorageProofOutputID(types.ProofMissed, uint64(j)))
}
et.FileContractIDs = append(et.FileContractIDs, fcid)
et.FileContractValidProofOutputIDs = append(et.FileContractValidProofOutputIDs, fcvpoids)
et.FileContractMissedProofOutputIDs = append(et.FileContractMissedProofOutputIDs, fcmpoids)
}
// Add all of the valid and missed proof ids as extra data to the file
// contract revisions.
for _, fcr := range txn.FileContractRevisions {
var fcrvpoids []types.SiacoinOutputID
var fcrmpoids []types.SiacoinOutputID
for j := range fcr.NewValidProofOutputs {
fcrvpoids = append(fcrvpoids, fcr.ParentID.StorageProofOutputID(types.ProofValid, uint64(j)))
}
for j := range fcr.NewMissedProofOutputs {
fcrmpoids = append(fcrmpoids, fcr.ParentID.StorageProofOutputID(types.ProofMissed, uint64(j)))
}
et.FileContractValidProofOutputIDs = append(et.FileContractValidProofOutputIDs, fcrvpoids)
et.FileContractMissedProofOutputIDs = append(et.FileContractMissedProofOutputIDs, fcrmpoids)
}
// Add all of the output ids and outputs corresponding with each storage
// proof.
for _, sp := range txn.StorageProofs {
fileContract, fileContractRevisions, fileContractExists, _ := api.explorer.FileContractHistory(sp.ParentID)
if !fileContractExists && build.DEBUG {
panic("could not find a file contract connected with a storage proof")
}
var storageProofOutputs []types.SiacoinOutput
if len(fileContractRevisions) > 0 {
storageProofOutputs = fileContractRevisions[len(fileContractRevisions)-1].NewValidProofOutputs
} else {
storageProofOutputs = fileContract.ValidProofOutputs
}
var storageProofOutputIDs []types.SiacoinOutputID
for i := range storageProofOutputs {
storageProofOutputIDs = append(storageProofOutputIDs, sp.ParentID.StorageProofOutputID(types.ProofValid, uint64(i)))
}
et.StorageProofOutputIDs = append(et.StorageProofOutputIDs, storageProofOutputIDs)
et.StorageProofOutputs = append(et.StorageProofOutputs, storageProofOutputs)
}
// Add the siafund outputs that correspond to each siacoin input.
for _, sci := range txn.SiafundInputs {
sco, exists := api.explorer.SiafundOutput(sci.ParentID)
if build.DEBUG && !exists {
panic("could not find corresponding siafund output")
}
et.SiafundInputOutputs = append(et.SiafundInputOutputs, sco)
}
for i := range txn.SiafundOutputs {
et.SiafundOutputIDs = append(et.SiafundOutputIDs, txn.SiafundOutputID(uint64(i)))
}
for _, sfi := range txn.SiafundInputs {
et.SiafundClaimOutputIDs = append(et.SiafundClaimOutputIDs, sfi.ParentID.SiaClaimOutputID())
}
return et
}
// buildExplorerBlock takes a block and its height and uses it to construct an
// explorer block.
func (api *API) buildExplorerBlock(height types.BlockHeight, block types.Block) ExplorerBlock {
var mpoids []types.SiacoinOutputID
for i := range block.MinerPayouts {
mpoids = append(mpoids, block.MinerPayoutID(uint64(i)))
}
var etxns []ExplorerTransaction
for _, txn := range block.Transactions {
etxns = append(etxns, api.buildExplorerTransaction(height, block.ID(), txn))
}
facts, exists := api.explorer.BlockFacts(height)
if build.DEBUG && !exists {
panic("incorrect request to buildExplorerBlock - block does not exist")
}
return ExplorerBlock{
MinerPayoutIDs: mpoids,
Transactions: etxns,
RawBlock: block,
BlockFacts: facts,
}
}
// explorerHandler handles API calls to /explorer/blocks/:height.
func (api *API) explorerBlocksHandler(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
// Parse the height that's being requested.
var height types.BlockHeight
_, err := fmt.Sscan(ps.ByName("height"), &height)
if err != nil {
WriteError(w, Error{err.Error()}, http.StatusBadRequest)
return
}
// Fetch and return the explorer block.
block, exists := api.cs.BlockAtHeight(height)
if !exists {
WriteError(w, Error{"no block found at input height in call to /explorer/block"}, http.StatusBadRequest)
return
}
WriteJSON(w, ExplorerBlockGET{
Block: api.buildExplorerBlock(height, block),
})
}
// buildTransactionSet returns the blocks and transactions that are associated
// with a set of transaction ids.
func (api *API) buildTransactionSet(txids []types.TransactionID) (txns []ExplorerTransaction, blocks []ExplorerBlock) {
for _, txid := range txids {
// Get the block containing the transaction - in the case of miner
// payouts, the block might be the transaction.
block, height, exists := api.explorer.Transaction(txid)
if !exists && build.DEBUG {
panic("explorer pointing to nonexistent txn")
}
// Check if the block is the transaction.
if types.TransactionID(block.ID()) == txid {
blocks = append(blocks, api.buildExplorerBlock(height, block))
} else {
// Find the transaction within the block with the correct id.
for _, t := range block.Transactions {
if t.ID() == txid {
txns = append(txns, api.buildExplorerTransaction(height, block.ID(), t))
break
}
}
}
}
return txns, blocks
}
// explorerHashHandler handles GET requests to /explorer/hash/:hash.
func (api *API) explorerHashHandler(w http.ResponseWriter, req *http.Request, ps httprouter.Params) {
// Scan the hash as a hash. If that fails, try scanning the hash as an
// address.
hash, err := scanHash(ps.ByName("hash"))
if err != nil {
addr, err := scanAddress(ps.ByName("hash"))
if err != nil {
WriteError(w, Error{err.Error()}, http.StatusBadRequest)
return
}
hash = crypto.Hash(addr)
}
// TODO: lookups on the zero hash are too expensive to allow. Need a
// better way to handle this case.
if hash == (crypto.Hash{}) {
WriteError(w, Error{"can't lookup the empty unlock hash"}, http.StatusBadRequest)
return
}
// Try the hash as a block id.
block, height, exists := api.explorer.Block(types.BlockID(hash))
if exists {
WriteJSON(w, ExplorerHashGET{
HashType: "blockid",
Block: api.buildExplorerBlock(height, block),
})
return
}
// Try the hash as a transaction id.
block, height, exists = api.explorer.Transaction(types.TransactionID(hash))
if exists {
var txn types.Transaction
for _, t := range block.Transactions {
if t.ID() == types.TransactionID(hash) {
txn = t
}
}
WriteJSON(w, ExplorerHashGET{
HashType: "transactionid",
Transaction: api.buildExplorerTransaction(height, block.ID(), txn),
})
return
}
// Try the hash as a siacoin output id.
txids := api.explorer.SiacoinOutputID(types.SiacoinOutputID(hash))
if len(txids) != 0 {
txns, blocks := api.buildTransactionSet(txids)
WriteJSON(w, ExplorerHashGET{
HashType: "siacoinoutputid",
Blocks: blocks,
Transactions: txns,
})
return
}
// Try the hash as a file contract id.
txids = api.explorer.FileContractID(types.FileContractID(hash))
if len(txids) != 0 {
txns, blocks := api.buildTransactionSet(txids)
WriteJSON(w, ExplorerHashGET{
HashType: "filecontractid",
Blocks: blocks,
Transactions: txns,
})
return
}
// Try the hash as a siafund output id.
txids = api.explorer.SiafundOutputID(types.SiafundOutputID(hash))
if len(txids) != 0 {
txns, blocks := api.buildTransactionSet(txids)
WriteJSON(w, ExplorerHashGET{
HashType: "siafundoutputid",
Blocks: blocks,
Transactions: txns,
})
return
}
// Try the hash as an unlock hash. Unlock hash is checked last because
// unlock hashes do not have collision-free guarantees. Someone can create
// an unlock hash that collides with another object id. They will not be
// able to use the unlock hash, but they can disrupt the explorer. This is
// handled by checking the unlock hash last. Anyone intentionally creating
// a colliding unlock hash (such a collision can only happen if done
// intentionally) will be unable to find their unlock hash in the
// blockchain through the explorer hash lookup.
txids = api.explorer.UnlockHash(types.UnlockHash(hash))
if len(txids) != 0 {
txns, blocks := api.buildTransactionSet(txids)
WriteJSON(w, ExplorerHashGET{
HashType: "unlockhash",
Blocks: blocks,
Transactions: txns,
})
return
}
// Hash not found, return an error.
WriteError(w, Error{"unrecognized hash used as input to /explorer/hash"}, http.StatusBadRequest)
}
// explorerHandler handles API calls to /explorer
func (api *API) explorerHandler(w http.ResponseWriter, req *http.Request, _ httprouter.Params) {
facts := api.explorer.LatestBlockFacts()
WriteJSON(w, ExplorerGET{
BlockFacts: facts,
})
}