From f8e30236a3ddbf9bd6bc31aa9b481e78ff56833b Mon Sep 17 00:00:00 2001 From: fiatjaf Date: Tue, 11 Aug 2020 22:44:04 -0300 Subject: [PATCH] migrate from the other repo. --- .gitignore | 2 + Makefile | 3 + README.md | 40 ++++++++ estimatefees.go | 40 ++++++++ getblock.go | 155 ++++++++++++++++++++++++++++ gettip.go | 34 ++++++ gettransaction.go | 38 +++++++ go.mod | 9 ++ go.sum | 250 +++++++++++++++++++++++++++++++++++++++++++++ main.go | 163 +++++++++++++++++++++++++++++ sendtransaction.go | 32 ++++++ 11 files changed, 766 insertions(+) create mode 100644 .gitignore create mode 100644 Makefile create mode 100644 README.md create mode 100644 estimatefees.go create mode 100644 getblock.go create mode 100644 gettip.go create mode 100644 gettransaction.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 main.go create mode 100644 sendtransaction.go diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..26ebcf1 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +dist/* +trustedcoin diff --git a/Makefile b/Makefile new file mode 100644 index 0000000..cc52ea5 --- /dev/null +++ b/Makefile @@ -0,0 +1,3 @@ +dist: $(shell find . -name "*.go") + mkdir -p dist + gox -ldflags="-s -w" -tags="full" -osarch="darwin/amd64 linux/386 linux/amd64 linux/arm freebsd/amd64" -output="dist/trustedcoin_{{.OS}}_{{.Arch}}" diff --git a/README.md b/README.md new file mode 100644 index 0000000..349edf6 --- /dev/null +++ b/README.md @@ -0,0 +1,40 @@ +## The `trustedcoin` plugin + +A plugin that uses block explorers (blockstream.info, mempool.space, blockchair.com and blockchain.info) as backends instead of your own Bitcoin node. + +This isn't what you should be doing, but sometimes you may need it. + +(Remember this will download all blocks c-lightning needs from blockchain.info or blockchair.com in raw, hex format.) + +## How to install + +This is distributed as a single binary for your delight (or you can compile it yourself with `go get`, or ask me for binaries for other systems if you need them). + +[Download it](https://github.com/fiatjaf/trustedcoin/releases), call `chmod +x ` and put it in `~/.lightning/plugins` (create that directory if it doesn't exist). + +You only need the binary you can get in [the releases page](https://github.com/fiatjaf/trustedcoin/releases), nothing else. + +Then add the following line to your `~/.lightning/config` file: + +``` +disable-plugin=bcli +``` + +This disables the default Bitcoin backend plugin so `trustedcoin` can take its place. + +### Extra: how to bootstrap a Lightning node from scratch, without Bitcoin Core, on Ubuntu amd64 + +``` +add-apt-repository ppa:lightningnetwork/ppa +apt update +apt install lightningd +mkdir -p ~/.lightning/plugins +echo 'disable-plugin=bcli' >> .lightning/config +cd ~/.lightning/plugins +wget https://github.com/fiatjaf/lightningd-gjson-rpc/releases/download/trustedcoin-v0.2.4/trustedcoin_linux_amd64 +chmod +x trustedcoin_linux_amd64 +cd +lightningd +``` + +## Built with [![GoDoc](https://godoc.org/github.com/fiatjaf/lightningd-gjson-rpc?status.svg)](https://godoc.org/github.com/fiatjaf/lightningd-gjson-rpc) diff --git a/estimatefees.go b/estimatefees.go new file mode 100644 index 0000000..065923a --- /dev/null +++ b/estimatefees.go @@ -0,0 +1,40 @@ +package main + +import ( + "encoding/json" + "errors" + "net/http" +) + +type EstimatedFees struct { + Opening *int `json:"opening"` + MutualClose *int `json:"mutual_close"` + UnilateralClose *int `json:"unilateral_close"` + DelayedToUs *int `json:"delayed_to_us"` + HTLCResolution *int `json:"htlc_resolution"` + Penalty *int `json:"penalty"` + MinAcceptable *int `json:"min_acceptable"` + MaxAcceptable *int `json:"max_acceptable"` +} + +func getFeeRatesFromEsplora() (feerates map[string]float64, err error) { + for _, endpoint := range esploras() { + w, errW := http.Get(endpoint + "/fee-estimates") + if errW != nil { + err = errW + continue + } + defer w.Body.Close() + + if w.StatusCode >= 300 { + err = errors.New(endpoint + " error: " + w.Status) + return + } + + err = json.NewDecoder(w.Body).Decode(&feerates) + return + } + + err = errors.New("none of the esploras returned usable responses") + return +} diff --git a/getblock.go b/getblock.go new file mode 100644 index 0000000..6801ef0 --- /dev/null +++ b/getblock.go @@ -0,0 +1,155 @@ +package main + +import ( + "encoding/hex" + "encoding/json" + "errors" + "fmt" + "io/ioutil" + "net/http" + "strings" + + "github.com/btcsuite/btcd/chaincfg/chainhash" + "github.com/btcsuite/btcutil" +) + +var heightCache = make(map[int64]string) + +func getBlock(height int64) (block, hash string, err error) { + hash, err = getHash(height) + if err != nil { + return + } + if hash == "" /* block unavailable */ { + return + } + + for _, try := range []func(string) (string, error){ + blockFromBlockchainInfo, + blockFromBlockchair, + } { + blockhex, errW := try(hash) + if errW != nil || blockhex == "" { + err = errW + continue + } + + // verify and hash + blockbytes, errW := hex.DecodeString(blockhex) + if errW != nil { + err = errW + continue + } + + blockparsed, errW := btcutil.NewBlockFromBytes(blockbytes) + if errW != nil { + err = errW + continue + } + header := blockparsed.MsgBlock().Header + + blockhash := hex.EncodeToString(reverseHash(blockparsed.Hash())) + if blockhash != hash { + err = fmt.Errorf("fetched block hash %s doesn't match expected %s", + blockhash, hash) + continue + } + + prevHash := hex.EncodeToString(header.PrevBlock[:]) + if cachedPrevHash, ok := heightCache[height-1]; ok { + if prevHash != cachedPrevHash { + // something is badly wrong with this block + err = fmt.Errorf("block %d (%s): prev block hash %d (%s) doesn't match what we know from previous block %d (%s)", height, blockhash, height-1, prevHash, height-1, cachedPrevHash) + continue + } + } + + delete(heightCache, height) + return blockhex, hash, nil + } + + return +} + +func getHash(height int64) (hash string, err error) { + for _, endpoint := range esploras() { + w, errW := http.Get(fmt.Sprintf(endpoint+"/block-height/%d", height)) + if errW != nil { + err = errW + continue + } + defer w.Body.Close() + + if w.StatusCode >= 404 { + continue + } + + data, errW := ioutil.ReadAll(w.Body) + if errW != nil { + err = errW + continue + } + + hash = strings.TrimSpace(string(data)) + + if len(hash) > 64 { + err = errors.New("got something that isn't a block hash: " + hash[:64]) + continue + } + + heightCache[height] = hash + + return hash, nil + } + + return "", err +} + +func blockFromBlockchainInfo(hash string) (string, error) { + w, err := http.Get(fmt.Sprintf("https://blockchain.info/block/%s?format=hex", hash)) + if err != nil { + return "", fmt.Errorf("failed to get raw block %s from blockchain.info: %s", hash, err.Error()) + } + defer w.Body.Close() + + block, _ := ioutil.ReadAll(w.Body) + if len(block) < 100 { + // block not available here yet + return "", nil + } + + return string(block), nil +} + +func blockFromBlockchair(hash string) (string, error) { + w, err := http.Get("https://api.blockchair.com/bitcoin/raw/block/" + hash) + if err != nil { + return "", fmt.Errorf("failed to get raw block %s from blockchair.com: %s", hash, err.Error()) + } + defer w.Body.Close() + + var data struct { + Data map[string]struct { + RawBlock string `json:"raw_block"` + } `json:"data"` + } + err = json.NewDecoder(w.Body).Decode(&data) + if err != nil { + return "", err + } + + if bdata, ok := data.Data[hash]; ok { + return bdata.RawBlock, nil + } else { + // block not available here yet + return "", nil + } +} + +func reverseHash(hash *chainhash.Hash) []byte { + r := make([]byte, chainhash.HashSize) + for i, b := range hash { + r[chainhash.HashSize-i-1] = b + } + return r +} diff --git a/gettip.go b/gettip.go new file mode 100644 index 0000000..a1d6c9a --- /dev/null +++ b/gettip.go @@ -0,0 +1,34 @@ +package main + +import ( + "io/ioutil" + "net/http" + "strconv" +) + +func getTip() (tip int64, err error) { + for _, endpoint := range esploras() { + w, errW := http.Get(endpoint + "/blocks/tip/height") + if errW != nil { + err = errW + continue + } + defer w.Body.Close() + + data, errW := ioutil.ReadAll(w.Body) + if errW != nil { + err = errW + continue + } + + tip, errW = strconv.ParseInt(string(data), 10, 64) + if errW != nil { + err = errW + continue + } + + return tip, nil + } + + return 0, err +} diff --git a/gettransaction.go b/gettransaction.go new file mode 100644 index 0000000..c220ccb --- /dev/null +++ b/gettransaction.go @@ -0,0 +1,38 @@ +package main + +import ( + "encoding/json" + "net/http" +) + +type UTXOResponse struct { + Amount *int64 `json:"amount"` + Script *string `json:"script"` +} + +func getTransaction(txid string) (tx struct { + TXID string `json:"txid"` + Vout []struct { + ScriptPubKey string `json:"scriptPubKey"` + Value int64 `json:"value"` + } `json:"vout"` +}, err error) { + for _, endpoint := range esploras() { + w, errW := http.Get(endpoint + "/tx/" + txid) + if errW != nil { + err = errW + continue + } + defer w.Body.Close() + + errW = json.NewDecoder(w.Body).Decode(&tx) + if errW != nil { + err = errW + continue + } + + return tx, nil + } + + return +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..142201b --- /dev/null +++ b/go.mod @@ -0,0 +1,9 @@ +module github.com/fiatjaf/trustedcoin + +go 1.14 + +require ( + github.com/btcsuite/btcd v0.20.1-beta.0.20200515232429-9f0179fd2c46 + github.com/btcsuite/btcutil v1.0.2 + github.com/fiatjaf/lightningd-gjson-rpc v1.0.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..a7555d5 --- /dev/null +++ b/go.sum @@ -0,0 +1,250 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +git.schwanenlied.me/yawning/bsaes.git v0.0.0-20180720073208-c0276d75487e/go.mod h1:BWqTsj8PgcPriQJGl7el20J/7TuT1d/hSyFDXMEpoEo= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/NYTimes/gziphandler 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"github.com/fiatjaf/lightningd-gjson-rpc/plugin" +) + +var ( + esplora = []string{ + "https://mempool.space/api", + "https://blockstream.info/api", + "https://explorer.bullbitcoin.com/api", + "https://mempool.emzy.de/api", + } +) + +func esploras() (ss []string) { + n := len(esplora) + index := rand.Intn(10) + ss = make([]string, n) + for i := 0; i < n; i++ { + ss[i] = esplora[index%n] + } + return ss +} + +func main() { + p := plugin.Plugin{ + Name: "trustedcoin", + Version: "v0.2.5", + RPCMethods: []plugin.RPCMethod{ + { + "getrawblockbyheight", + "height", + "Get the bitcoin block at a given height", + "", + func(p *plugin.Plugin, params plugin.Params) (resp interface{}, errCode int, err error) { + height := params.Get("height").Int() + + blockUnavailable := map[string]interface{}{ + "blockhash": nil, + "block": nil, + } + + block, hash, err := getBlock(height) + if err != nil { + p.Logf("getblock error: %s", err.Error()) + return blockUnavailable, 0, nil + } + if block == "" { + return blockUnavailable, 0, nil + } + + p.Logf("returning block %d, %s…, %d bytes", + height, string(hash[:26]), len(block)/2) + + return struct { + BlockHash string `json:"blockhash"` + Block string `json:"block"` + }{hash, string(block)}, 0, nil + }, + }, { + "getchaininfo", + "", + "Get the chain id, the header count, the block count and whether this is IBD.", + "", + func(p *plugin.Plugin, params plugin.Params) (resp interface{}, errCode int, err error) { + tip, err := getTip() + if err != nil { + return nil, 20, fmt.Errorf("failed to get tip: %s", err.Error()) + } + + p.Logf("tip: %d", tip) + + return struct { + Chain string `json:"chain"` + HeaderCount int64 `json:"headercount"` + BlockCount int64 `json:"blockcount"` + IBD bool `json:"ibd"` + }{"main", tip, tip, false}, 0, nil + }, + }, { + "estimatefees", + "", + "Get the Bitcoin feerate in btc/kilo-vbyte.", + "", + func(p *plugin.Plugin, params plugin.Params) (resp interface{}, errCode int, err error) { + // just copy sauron here + feerates, err := getFeeRatesFromEsplora() + if err != nil { + p.Logf("estimatefees error: %s", err.Error()) + return EstimatedFees{nil, nil, nil, nil, nil, nil, nil, nil}, + 0, nil + } + + var ( + slow = int(feerates["504"] * 1000) + normal = int(feerates["10"] * 1000) + urgent = int(feerates["5"] * 1000) + very_urgent = int(feerates["2"] * 1000) + + intp = func(x int) *int { return &x } + ) + + // actually let's be a little more patient here than sauron is + return EstimatedFees{ + Opening: intp(slow), + MutualClose: intp(normal), + UnilateralClose: intp(very_urgent), + DelayedToUs: intp(slow), + HTLCResolution: intp(normal), + Penalty: intp(urgent), + MinAcceptable: intp(slow / 2), + MaxAcceptable: intp(very_urgent * 100), + }, 0, nil + }, + }, { + "sendrawtransaction", + "tx", + "Send a raw transaction to the Bitcoin network.", + "", + func(p *plugin.Plugin, params plugin.Params) (resp interface{}, errCode int, err error) { + hex := params.Get("tx").String() + tx := bytes.NewBufferString(hex) + + srtresp, err := sendRawTransaction(tx) + if err != nil { + p.Logf("failed to publish transaction %s: %s", hex, err.Error()) + return nil, 21, err + } + + p.Logf("sent raw transaction: %s", hex) + + return srtresp, 0, nil + }, + }, { + "getutxout", + "txid vout", + "Get informations about an output, identified by a {txid} an a {vout}", + "", + func(p *plugin.Plugin, params plugin.Params) (resp interface{}, errCode int, err error) { + txid := params.Get("txid").String() + vout := params.Get("vout").Int() + + tx, err := getTransaction(txid) + if err != nil { + p.Logf("failed to get tx %s: %s", txid, err.Error()) + return UTXOResponse{nil, nil}, 0, nil + } + + output := tx.Vout[vout] + + return UTXOResponse{&output.Value, &output.ScriptPubKey}, 0, nil + }, + }, + }, + } + + p.Run() +} diff --git a/sendtransaction.go b/sendtransaction.go new file mode 100644 index 0000000..19513c0 --- /dev/null +++ b/sendtransaction.go @@ -0,0 +1,32 @@ +package main + +import ( + "io" + "io/ioutil" + "net/http" +) + +type RawTransactionResponse struct { + Success bool `json:"success"` + ErrMsg string `json:"errmsg"` +} + +func sendRawTransaction(tx io.Reader) (resp RawTransactionResponse, err error) { + for _, endpoint := range esploras() { + w, errW := http.Post(endpoint+"/tx", "text/plain", tx) + if errW != nil { + err = errW + continue + } + defer w.Body.Close() + + if w.StatusCode >= 300 { + msg, _ := ioutil.ReadAll(w.Body) + return RawTransactionResponse{false, string(msg)}, nil + } + + return RawTransactionResponse{true, ""}, nil + } + + return resp, err +}