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721 lines
22 KiB
721 lines
22 KiB
package rpcserver
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import (
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"bytes"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"io/ioutil"
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"net/http"
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"reflect"
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"sort"
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"strings"
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"time"
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"github.com/gorilla/websocket"
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"github.com/pkg/errors"
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types "github.com/tendermint/tendermint/rpc/lib/types"
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cmn "github.com/tendermint/tmlibs/common"
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events "github.com/tendermint/tmlibs/events"
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"github.com/tendermint/tmlibs/log"
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)
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// RegisterRPCFuncs adds a route for each function in the funcMap, as well as general jsonrpc and websocket handlers for all functions.
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// "result" is the interface on which the result objects are registered, and is popualted with every RPCResponse
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func RegisterRPCFuncs(mux *http.ServeMux, funcMap map[string]*RPCFunc, logger log.Logger) {
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// HTTP endpoints
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for funcName, rpcFunc := range funcMap {
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mux.HandleFunc("/"+funcName, makeHTTPHandler(rpcFunc, logger))
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}
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// JSONRPC endpoints
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mux.HandleFunc("/", makeJSONRPCHandler(funcMap, logger))
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}
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//-------------------------------------
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// function introspection
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// RPCFunc contains the introspected type information for a function
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type RPCFunc struct {
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f reflect.Value // underlying rpc function
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args []reflect.Type // type of each function arg
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returns []reflect.Type // type of each return arg
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argNames []string // name of each argument
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ws bool // websocket only
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}
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// NewRPCFunc wraps a function for introspection.
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// f is the function, args are comma separated argument names
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func NewRPCFunc(f interface{}, args string) *RPCFunc {
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return newRPCFunc(f, args, false)
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}
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// NewWSRPCFunc wraps a function for introspection and use in the websockets.
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func NewWSRPCFunc(f interface{}, args string) *RPCFunc {
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return newRPCFunc(f, args, true)
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}
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func newRPCFunc(f interface{}, args string, ws bool) *RPCFunc {
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var argNames []string
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if args != "" {
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argNames = strings.Split(args, ",")
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}
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return &RPCFunc{
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f: reflect.ValueOf(f),
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args: funcArgTypes(f),
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returns: funcReturnTypes(f),
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argNames: argNames,
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ws: ws,
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}
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}
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// return a function's argument types
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func funcArgTypes(f interface{}) []reflect.Type {
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t := reflect.TypeOf(f)
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n := t.NumIn()
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typez := make([]reflect.Type, n)
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for i := 0; i < n; i++ {
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typez[i] = t.In(i)
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}
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return typez
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}
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// return a function's return types
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func funcReturnTypes(f interface{}) []reflect.Type {
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t := reflect.TypeOf(f)
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n := t.NumOut()
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typez := make([]reflect.Type, n)
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for i := 0; i < n; i++ {
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typez[i] = t.Out(i)
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}
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return typez
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}
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// function introspection
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//-----------------------------------------------------------------------------
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// rpc.json
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// jsonrpc calls grab the given method's function info and runs reflect.Call
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func makeJSONRPCHandler(funcMap map[string]*RPCFunc, logger log.Logger) http.HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request) {
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b, _ := ioutil.ReadAll(r.Body)
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// if its an empty request (like from a browser),
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// just display a list of functions
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if len(b) == 0 {
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writeListOfEndpoints(w, r, funcMap)
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return
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}
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var request types.RPCRequest
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err := json.Unmarshal(b, &request)
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if err != nil {
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WriteRPCResponseHTTP(w, types.RPCParseError("", errors.Wrap(err, "Error unmarshalling request")))
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return
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}
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// A Notification is a Request object without an "id" member.
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// The Server MUST NOT reply to a Notification, including those that are within a batch request.
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if request.ID == "" {
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return
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}
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if len(r.URL.Path) > 1 {
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WriteRPCResponseHTTP(w, types.RPCInvalidRequestError(request.ID, errors.Errorf("Path %s is invalid", r.URL.Path)))
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return
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}
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rpcFunc := funcMap[request.Method]
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if rpcFunc == nil || rpcFunc.ws {
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WriteRPCResponseHTTP(w, types.RPCMethodNotFoundError(request.ID))
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return
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}
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args, err := jsonParamsToArgsRPC(rpcFunc, request.Params)
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if err != nil {
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WriteRPCResponseHTTP(w, types.RPCInvalidParamsError(request.ID, errors.Wrap(err, "Error converting json params to arguments")))
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return
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}
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returns := rpcFunc.f.Call(args)
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logger.Info("HTTPJSONRPC", "method", request.Method, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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if err != nil {
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WriteRPCResponseHTTP(w, types.RPCInternalError(request.ID, err))
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return
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}
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WriteRPCResponseHTTP(w, types.NewRPCSuccessResponse(request.ID, result))
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}
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}
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func mapParamsToArgs(rpcFunc *RPCFunc, params map[string]*json.RawMessage, argsOffset int) ([]reflect.Value, error) {
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values := make([]reflect.Value, len(rpcFunc.argNames))
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for i, argName := range rpcFunc.argNames {
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argType := rpcFunc.args[i+argsOffset]
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if p, ok := params[argName]; ok && p != nil && len(*p) > 0 {
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val := reflect.New(argType)
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err := json.Unmarshal(*p, val.Interface())
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if err != nil {
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return nil, err
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}
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values[i] = val.Elem()
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} else { // use default for that type
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values[i] = reflect.Zero(argType)
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}
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}
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return values, nil
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}
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func arrayParamsToArgs(rpcFunc *RPCFunc, params []*json.RawMessage, argsOffset int) ([]reflect.Value, error) {
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if len(rpcFunc.argNames) != len(params) {
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return nil, errors.Errorf("Expected %v parameters (%v), got %v (%v)",
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len(rpcFunc.argNames), rpcFunc.argNames, len(params), params)
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}
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values := make([]reflect.Value, len(params))
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for i, p := range params {
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argType := rpcFunc.args[i+argsOffset]
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val := reflect.New(argType)
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err := json.Unmarshal(*p, val.Interface())
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if err != nil {
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return nil, err
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}
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values[i] = val.Elem()
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}
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return values, nil
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}
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// raw is unparsed json (from json.RawMessage) encoding either a map or an array.
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//
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// argsOffset should be 0 for RPC calls, and 1 for WS requests, where len(rpcFunc.args) != len(rpcFunc.argNames).
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// Example:
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// rpcFunc.args = [rpctypes.WSRPCContext string]
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// rpcFunc.argNames = ["arg"]
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func jsonParamsToArgs(rpcFunc *RPCFunc, raw []byte, argsOffset int) ([]reflect.Value, error) {
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// first, try to get the map..
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var m map[string]*json.RawMessage
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err := json.Unmarshal(raw, &m)
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if err == nil {
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return mapParamsToArgs(rpcFunc, m, argsOffset)
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}
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// otherwise, try an array
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var a []*json.RawMessage
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err = json.Unmarshal(raw, &a)
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if err == nil {
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return arrayParamsToArgs(rpcFunc, a, argsOffset)
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}
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// otherwise, bad format, we cannot parse
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return nil, errors.Errorf("Unknown type for JSON params: %v. Expected map or array", err)
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}
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// Convert a []interface{} OR a map[string]interface{} to properly typed values
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func jsonParamsToArgsRPC(rpcFunc *RPCFunc, params *json.RawMessage) ([]reflect.Value, error) {
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return jsonParamsToArgs(rpcFunc, *params, 0)
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}
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// Same as above, but with the first param the websocket connection
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func jsonParamsToArgsWS(rpcFunc *RPCFunc, params *json.RawMessage, wsCtx types.WSRPCContext) ([]reflect.Value, error) {
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values, err := jsonParamsToArgs(rpcFunc, *params, 1)
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if err != nil {
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return nil, err
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}
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return append([]reflect.Value{reflect.ValueOf(wsCtx)}, values...), nil
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}
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// rpc.json
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//-----------------------------------------------------------------------------
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// rpc.http
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// convert from a function name to the http handler
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func makeHTTPHandler(rpcFunc *RPCFunc, logger log.Logger) func(http.ResponseWriter, *http.Request) {
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// Exception for websocket endpoints
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if rpcFunc.ws {
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return func(w http.ResponseWriter, r *http.Request) {
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WriteRPCResponseHTTP(w, types.RPCMethodNotFoundError(""))
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}
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}
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// All other endpoints
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return func(w http.ResponseWriter, r *http.Request) {
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logger.Debug("HTTP HANDLER", "req", r)
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args, err := httpParamsToArgs(rpcFunc, r)
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if err != nil {
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WriteRPCResponseHTTP(w, types.RPCInvalidParamsError("", errors.Wrap(err, "Error converting http params to arguments")))
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return
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}
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returns := rpcFunc.f.Call(args)
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logger.Info("HTTPRestRPC", "method", r.URL.Path, "args", args, "returns", returns)
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result, err := unreflectResult(returns)
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if err != nil {
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WriteRPCResponseHTTP(w, types.RPCInternalError("", err))
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return
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}
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WriteRPCResponseHTTP(w, types.NewRPCSuccessResponse("", result))
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}
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}
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// Covert an http query to a list of properly typed values.
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// To be properly decoded the arg must be a concrete type from tendermint (if its an interface).
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func httpParamsToArgs(rpcFunc *RPCFunc, r *http.Request) ([]reflect.Value, error) {
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values := make([]reflect.Value, len(rpcFunc.args))
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for i, name := range rpcFunc.argNames {
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argType := rpcFunc.args[i]
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values[i] = reflect.Zero(argType) // set default for that type
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arg := GetParam(r, name)
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// log.Notice("param to arg", "argType", argType, "name", name, "arg", arg)
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if "" == arg {
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continue
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}
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v, err, ok := nonJsonToArg(argType, arg)
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if err != nil {
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return nil, err
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}
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if ok {
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values[i] = v
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continue
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}
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values[i], err = _jsonStringToArg(argType, arg)
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if err != nil {
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return nil, err
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}
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}
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return values, nil
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}
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func _jsonStringToArg(ty reflect.Type, arg string) (reflect.Value, error) {
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v := reflect.New(ty)
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err := json.Unmarshal([]byte(arg), v.Interface())
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if err != nil {
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return v, err
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}
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v = v.Elem()
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return v, nil
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}
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func nonJsonToArg(ty reflect.Type, arg string) (reflect.Value, error, bool) {
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isQuotedString := strings.HasPrefix(arg, `"`) && strings.HasSuffix(arg, `"`)
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isHexString := strings.HasPrefix(strings.ToLower(arg), "0x")
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expectingString := ty.Kind() == reflect.String
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expectingByteSlice := ty.Kind() == reflect.Slice && ty.Elem().Kind() == reflect.Uint8
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if isHexString {
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if !expectingString && !expectingByteSlice {
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err := errors.Errorf("Got a hex string arg, but expected '%s'",
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ty.Kind().String())
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return reflect.ValueOf(nil), err, false
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}
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var value []byte
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value, err := hex.DecodeString(arg[2:])
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if err != nil {
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return reflect.ValueOf(nil), err, false
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}
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if ty.Kind() == reflect.String {
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return reflect.ValueOf(string(value)), nil, true
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}
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return reflect.ValueOf([]byte(value)), nil, true
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}
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if isQuotedString && expectingByteSlice {
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v := reflect.New(reflect.TypeOf(""))
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err := json.Unmarshal([]byte(arg), v.Interface())
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if err != nil {
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return reflect.ValueOf(nil), err, false
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}
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v = v.Elem()
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return reflect.ValueOf([]byte(v.String())), nil, true
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}
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return reflect.ValueOf(nil), nil, false
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}
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// rpc.http
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//-----------------------------------------------------------------------------
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// rpc.websocket
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const (
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defaultWSWriteChanCapacity = 1000
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defaultWSWriteWait = 10 * time.Second
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defaultWSReadWait = 30 * time.Second
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defaultWSPingPeriod = (defaultWSReadWait * 9) / 10
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)
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// a single websocket connection
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// contains listener id, underlying ws connection,
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// and the event switch for subscribing to events
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type wsConnection struct {
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cmn.BaseService
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remoteAddr string
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baseConn *websocket.Conn
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writeChan chan types.RPCResponse
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funcMap map[string]*RPCFunc
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evsw events.EventSwitch
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// write channel capacity
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writeChanCapacity int
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// each write times out after this.
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writeWait time.Duration
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// Connection times out if we haven't received *anything* in this long, not even pings.
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readWait time.Duration
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// Send pings to server with this period. Must be less than readWait, but greater than zero.
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pingPeriod time.Duration
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}
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// NewWSConnection wraps websocket.Conn. See the commentary on the
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// func(*wsConnection) functions for a detailed description of how to configure
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// ping period and pong wait time.
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// NOTE: if the write buffer is full, pongs may be dropped, which may cause clients to disconnect.
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// see https://github.com/gorilla/websocket/issues/97
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func NewWSConnection(baseConn *websocket.Conn, funcMap map[string]*RPCFunc, evsw events.EventSwitch, options ...func(*wsConnection)) *wsConnection {
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wsc := &wsConnection{
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remoteAddr: baseConn.RemoteAddr().String(),
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baseConn: baseConn,
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funcMap: funcMap,
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evsw: evsw,
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writeWait: defaultWSWriteWait,
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writeChanCapacity: defaultWSWriteChanCapacity,
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readWait: defaultWSReadWait,
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pingPeriod: defaultWSPingPeriod,
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}
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for _, option := range options {
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option(wsc)
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}
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wsc.BaseService = *cmn.NewBaseService(nil, "wsConnection", wsc)
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return wsc
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}
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// WriteWait sets the amount of time to wait before a websocket write times out.
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// It should only be used in the constructor - not Goroutine-safe.
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func WriteWait(writeWait time.Duration) func(*wsConnection) {
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return func(wsc *wsConnection) {
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wsc.writeWait = writeWait
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}
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}
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// WriteChanCapacity sets the capacity of the websocket write channel.
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// It should only be used in the constructor - not Goroutine-safe.
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func WriteChanCapacity(cap int) func(*wsConnection) {
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return func(wsc *wsConnection) {
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wsc.writeChanCapacity = cap
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}
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}
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// ReadWait sets the amount of time to wait before a websocket read times out.
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// It should only be used in the constructor - not Goroutine-safe.
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func ReadWait(readWait time.Duration) func(*wsConnection) {
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return func(wsc *wsConnection) {
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wsc.readWait = readWait
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}
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}
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// PingPeriod sets the duration for sending websocket pings.
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// It should only be used in the constructor - not Goroutine-safe.
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func PingPeriod(pingPeriod time.Duration) func(*wsConnection) {
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return func(wsc *wsConnection) {
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wsc.pingPeriod = pingPeriod
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}
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}
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// OnStart starts the read and write routines. It blocks until the connection closes.
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func (wsc *wsConnection) OnStart() error {
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wsc.writeChan = make(chan types.RPCResponse, wsc.writeChanCapacity)
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// Read subscriptions/unsubscriptions to events
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go wsc.readRoutine()
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// Write responses, BLOCKING.
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wsc.writeRoutine()
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return nil
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}
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// OnStop unsubscribes from all events.
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func (wsc *wsConnection) OnStop() {
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if wsc.evsw != nil {
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wsc.evsw.RemoveListener(wsc.remoteAddr)
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}
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// Both read and write loops close the websocket connection when they exit their loops.
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// The writeChan is never closed, to allow WriteRPCResponse() to fail.
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}
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// GetRemoteAddr returns the remote address of the underlying connection.
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// It implements WSRPCConnection
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func (wsc *wsConnection) GetRemoteAddr() string {
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return wsc.remoteAddr
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}
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// GetEventSwitch returns the event switch.
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// It implements WSRPCConnection
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func (wsc *wsConnection) GetEventSwitch() events.EventSwitch {
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return wsc.evsw
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}
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// WriteRPCResponse pushes a response to the writeChan, and blocks until it is accepted.
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// It implements WSRPCConnection. It is Goroutine-safe.
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func (wsc *wsConnection) WriteRPCResponse(resp types.RPCResponse) {
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select {
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case <-wsc.Quit:
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return
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case wsc.writeChan <- resp:
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}
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}
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// TryWriteRPCResponse attempts to push a response to the writeChan, but does not block.
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// It implements WSRPCConnection. It is Goroutine-safe
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func (wsc *wsConnection) TryWriteRPCResponse(resp types.RPCResponse) bool {
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select {
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case <-wsc.Quit:
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return false
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case wsc.writeChan <- resp:
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return true
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default:
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return false
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}
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}
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// Read from the socket and subscribe to or unsubscribe from events
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func (wsc *wsConnection) readRoutine() {
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defer func() {
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wsc.baseConn.Close()
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}()
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for {
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select {
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case <-wsc.Quit:
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return
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default:
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// reset deadline for every type of message (control or data)
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wsc.baseConn.SetReadDeadline(time.Now().Add(wsc.readWait))
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var in []byte
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_, in, err := wsc.baseConn.ReadMessage()
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if err != nil {
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if websocket.IsCloseError(err, websocket.CloseNormalClosure) {
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wsc.Logger.Info("Client closed the connection")
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} else {
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wsc.Logger.Error("Failed to read request", "err", err)
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}
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wsc.Stop()
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return
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}
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|
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var request types.RPCRequest
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err = json.Unmarshal(in, &request)
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|
if err != nil {
|
|
wsc.WriteRPCResponse(types.RPCParseError("", errors.Wrap(err, "Error unmarshaling request")))
|
|
continue
|
|
}
|
|
|
|
// A Notification is a Request object without an "id" member.
|
|
// The Server MUST NOT reply to a Notification, including those that are within a batch request.
|
|
if request.ID == "" {
|
|
continue
|
|
}
|
|
|
|
// Now, fetch the RPCFunc and execute it.
|
|
|
|
rpcFunc := wsc.funcMap[request.Method]
|
|
if rpcFunc == nil {
|
|
wsc.WriteRPCResponse(types.RPCMethodNotFoundError(request.ID))
|
|
continue
|
|
}
|
|
var args []reflect.Value
|
|
if rpcFunc.ws {
|
|
wsCtx := types.WSRPCContext{Request: request, WSRPCConnection: wsc}
|
|
args, err = jsonParamsToArgsWS(rpcFunc, request.Params, wsCtx)
|
|
} else {
|
|
args, err = jsonParamsToArgsRPC(rpcFunc, request.Params)
|
|
}
|
|
if err != nil {
|
|
wsc.WriteRPCResponse(types.RPCInternalError(request.ID, errors.Wrap(err, "Error converting json params to arguments")))
|
|
continue
|
|
}
|
|
returns := rpcFunc.f.Call(args)
|
|
|
|
// TODO: Need to encode args/returns to string if we want to log them
|
|
wsc.Logger.Info("WSJSONRPC", "method", request.Method)
|
|
|
|
result, err := unreflectResult(returns)
|
|
if err != nil {
|
|
wsc.WriteRPCResponse(types.RPCInternalError(request.ID, err))
|
|
continue
|
|
} else {
|
|
wsc.WriteRPCResponse(types.NewRPCSuccessResponse(request.ID, result))
|
|
continue
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// receives on a write channel and writes out on the socket
|
|
func (wsc *wsConnection) writeRoutine() {
|
|
pingTicker := time.NewTicker(wsc.pingPeriod)
|
|
defer func() {
|
|
pingTicker.Stop()
|
|
wsc.baseConn.Close()
|
|
}()
|
|
|
|
// https://github.com/gorilla/websocket/issues/97
|
|
pongs := make(chan string, 1)
|
|
wsc.baseConn.SetPingHandler(func(m string) error {
|
|
select {
|
|
case pongs <- m:
|
|
default:
|
|
}
|
|
return nil
|
|
})
|
|
|
|
for {
|
|
select {
|
|
case m := <-pongs:
|
|
err := wsc.writeMessageWithDeadline(websocket.PongMessage, []byte(m))
|
|
if err != nil {
|
|
wsc.Logger.Info("Failed to write pong (client may disconnect)", "err", err)
|
|
}
|
|
case <-pingTicker.C:
|
|
err := wsc.writeMessageWithDeadline(websocket.PingMessage, []byte{})
|
|
if err != nil {
|
|
wsc.Logger.Error("Failed to write ping", "err", err)
|
|
wsc.Stop()
|
|
return
|
|
}
|
|
case msg := <-wsc.writeChan:
|
|
jsonBytes, err := json.MarshalIndent(msg, "", " ")
|
|
if err != nil {
|
|
wsc.Logger.Error("Failed to marshal RPCResponse to JSON", "err", err)
|
|
} else {
|
|
if err = wsc.writeMessageWithDeadline(websocket.TextMessage, jsonBytes); err != nil {
|
|
wsc.Logger.Error("Failed to write response", "err", err)
|
|
wsc.Stop()
|
|
return
|
|
}
|
|
}
|
|
case <-wsc.Quit:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// All writes to the websocket must (re)set the write deadline.
|
|
// If some writes don't set it while others do, they may timeout incorrectly (https://github.com/tendermint/tendermint/issues/553)
|
|
func (wsc *wsConnection) writeMessageWithDeadline(msgType int, msg []byte) error {
|
|
wsc.baseConn.SetWriteDeadline(time.Now().Add(wsc.writeWait))
|
|
return wsc.baseConn.WriteMessage(msgType, msg)
|
|
}
|
|
|
|
//----------------------------------------
|
|
|
|
// WebsocketManager is the main manager for all websocket connections.
|
|
// It holds the event switch and a map of functions for routing.
|
|
// NOTE: The websocket path is defined externally, e.g. in node/node.go
|
|
type WebsocketManager struct {
|
|
websocket.Upgrader
|
|
funcMap map[string]*RPCFunc
|
|
evsw events.EventSwitch
|
|
logger log.Logger
|
|
wsConnOptions []func(*wsConnection)
|
|
}
|
|
|
|
// NewWebsocketManager returns a new WebsocketManager that routes according to the given funcMap, listens on the given event switch,
|
|
// and connects to the server with the given connection options.
|
|
func NewWebsocketManager(funcMap map[string]*RPCFunc, evsw events.EventSwitch, wsConnOptions ...func(*wsConnection)) *WebsocketManager {
|
|
return &WebsocketManager{
|
|
funcMap: funcMap,
|
|
evsw: evsw,
|
|
Upgrader: websocket.Upgrader{
|
|
CheckOrigin: func(r *http.Request) bool {
|
|
// TODO ???
|
|
return true
|
|
},
|
|
},
|
|
logger: log.NewNopLogger(),
|
|
wsConnOptions: wsConnOptions,
|
|
}
|
|
}
|
|
|
|
// SetLogger sets the logger.
|
|
func (wm *WebsocketManager) SetLogger(l log.Logger) {
|
|
wm.logger = l
|
|
}
|
|
|
|
// WebsocketHandler upgrades the request/response (via http.Hijack) and starts the wsConnection.
|
|
func (wm *WebsocketManager) WebsocketHandler(w http.ResponseWriter, r *http.Request) {
|
|
wsConn, err := wm.Upgrade(w, r, nil)
|
|
if err != nil {
|
|
// TODO - return http error
|
|
wm.logger.Error("Failed to upgrade to websocket connection", "err", err)
|
|
return
|
|
}
|
|
|
|
// register connection
|
|
con := NewWSConnection(wsConn, wm.funcMap, wm.evsw, wm.wsConnOptions...)
|
|
con.SetLogger(wm.logger.With("remote", wsConn.RemoteAddr()))
|
|
wm.logger.Info("New websocket connection", "remote", con.remoteAddr)
|
|
con.Start() // Blocking
|
|
}
|
|
|
|
// rpc.websocket
|
|
//-----------------------------------------------------------------------------
|
|
|
|
// NOTE: assume returns is result struct and error. If error is not nil, return it
|
|
func unreflectResult(returns []reflect.Value) (interface{}, error) {
|
|
errV := returns[1]
|
|
if errV.Interface() != nil {
|
|
return nil, errors.Errorf("%v", errV.Interface())
|
|
}
|
|
rv := returns[0]
|
|
// the result is a registered interface,
|
|
// we need a pointer to it so we can marshal with type byte
|
|
rvp := reflect.New(rv.Type())
|
|
rvp.Elem().Set(rv)
|
|
return rvp.Interface(), nil
|
|
}
|
|
|
|
// writes a list of available rpc endpoints as an html page
|
|
func writeListOfEndpoints(w http.ResponseWriter, r *http.Request, funcMap map[string]*RPCFunc) {
|
|
noArgNames := []string{}
|
|
argNames := []string{}
|
|
for name, funcData := range funcMap {
|
|
if len(funcData.args) == 0 {
|
|
noArgNames = append(noArgNames, name)
|
|
} else {
|
|
argNames = append(argNames, name)
|
|
}
|
|
}
|
|
sort.Strings(noArgNames)
|
|
sort.Strings(argNames)
|
|
buf := new(bytes.Buffer)
|
|
buf.WriteString("<html><body>")
|
|
buf.WriteString("<br>Available endpoints:<br>")
|
|
|
|
for _, name := range noArgNames {
|
|
link := fmt.Sprintf("http://%s/%s", r.Host, name)
|
|
buf.WriteString(fmt.Sprintf("<a href=\"%s\">%s</a></br>", link, link))
|
|
}
|
|
|
|
buf.WriteString("<br>Endpoints that require arguments:<br>")
|
|
for _, name := range argNames {
|
|
link := fmt.Sprintf("http://%s/%s?", r.Host, name)
|
|
funcData := funcMap[name]
|
|
for i, argName := range funcData.argNames {
|
|
link += argName + "=_"
|
|
if i < len(funcData.argNames)-1 {
|
|
link += "&"
|
|
}
|
|
}
|
|
buf.WriteString(fmt.Sprintf("<a href=\"%s\">%s</a></br>", link, link))
|
|
}
|
|
buf.WriteString("</body></html>")
|
|
w.Header().Set("Content-Type", "text/html")
|
|
w.WriteHeader(200)
|
|
w.Write(buf.Bytes())
|
|
}
|