/exp/lighthorizon: new endpoints for tx and ops paged listing by acco…

…unt id (#4453)

exp/lighthorizon/actions/accounts.go

@@ -0,0 +1,129 @@
+package actions
+
+import (
+	"net/http"
+	"strconv"
+
+	"github.com/stellar/go/support/log"
+
+	"github.com/stellar/go/exp/lighthorizon/adapters"
+	"github.com/stellar/go/exp/lighthorizon/services"
+	hProtocol "github.com/stellar/go/protocols/horizon"
+	"github.com/stellar/go/protocols/horizon/operations"
+	"github.com/stellar/go/support/render/hal"
+	"github.com/stellar/go/toid"
+)
+
+const (
+	urlAccountId = "account_id"
+)
+
+func accountRequestParams(w http.ResponseWriter, r *http.Request) (string, pagination) {
+	var accountId string
+	var accountErr bool
+
+	if accountId, accountErr = getURLParam(r, urlAccountId); !accountErr {
+		sendErrorResponse(w, http.StatusBadRequest, "")
+		return "", pagination{}
+	}
+
+	paginate, err := paging(r)
+	if err != nil {
+		sendErrorResponse(w, http.StatusBadRequest, string(invalidPagingParameters))
+		return "", pagination{}
+	}
+
+	if paginate.Cursor < 1 {
+		paginate.Cursor = toid.New(1, 1, 1).ToInt64()
+	}
+
+	if paginate.Limit == 0 {
+		paginate.Limit = 10
+	}
+
+	return accountId, paginate
+}
+
+func NewTXByAccountHandler(lightHorizon services.LightHorizon) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		var accountId string
+		var paginate pagination
+
+		if accountId, paginate = accountRequestParams(w, r); accountId == "" {
+			return
+		}
+
+		page := hal.Page{
+			Cursor: strconv.FormatInt(paginate.Cursor, 10),
+			Order:  string(paginate.Order),
+			Limit:  uint64(paginate.Limit),
+		}
+		page.Init()
+		page.FullURL = r.URL
+
+		txns, err := lightHorizon.Transactions.GetTransactionsByAccount(ctx, paginate.Cursor, paginate.Limit, accountId)
+		if err != nil {
+			log.Error(err)
+			sendErrorResponse(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		for _, txn := range txns {
+			var response hProtocol.Transaction
+			response, err = adapters.PopulateTransaction(r, &txn)
+			if err != nil {
+				log.Error(err)
+				sendErrorResponse(w, http.StatusInternalServerError, err.Error())
+				return
+			}
+
+			page.Add(response)
+		}
+
+		page.PopulateLinks()
+		sendPageResponse(w, page)
+	}
+}
+
+func NewOpsByAccountHandler(lightHorizon services.LightHorizon) func(http.ResponseWriter, *http.Request) {
+	return func(w http.ResponseWriter, r *http.Request) {
+		ctx := r.Context()
+		var accountId string
+		var paginate pagination
+
+		if accountId, paginate = accountRequestParams(w, r); accountId == "" {
+			return
+		}
+
+		page := hal.Page{
+			Cursor: strconv.FormatInt(paginate.Cursor, 10),
+			Order:  string(paginate.Order),
+			Limit:  uint64(paginate.Limit),
+		}
+		page.Init()
+		page.FullURL = r.URL
+
+		ops, err := lightHorizon.Operations.GetOperationsByAccount(ctx, paginate.Cursor, paginate.Limit, accountId)
+		if err != nil {
+			log.Error(err)
+			sendErrorResponse(w, http.StatusInternalServerError, err.Error())
+			return
+		}
+
+		for _, op := range ops {
+			var response operations.Operation
+			response, err = adapters.PopulateOperation(r, &op)
+			if err != nil {
+				log.Error(err)
+				sendErrorResponse(w, http.StatusInternalServerError, err.Error())
+				return
+			}
+
+			page.Add(response)
+		}
+
+		page.PopulateLinks()
+		sendPageResponse(w, page)
+	}
+}

exp/lighthorizon/actions/main.go

@@ -3,36 +3,55 @@ package actions
 import (
 	"embed"
 	"encoding/json"
+	"fmt"
 	"net/http"
 	"net/url"
 	"strconv"
 
+	"github.com/go-chi/chi"
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
 	"github.com/stellar/go/support/log"
 	"github.com/stellar/go/support/render/hal"
 )
 
 var (
 	//go:embed static
 	staticFiles embed.FS
+	//lint:ignore U1000 temporary
+	requestCount = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "horizon_lite_request_count",
+		Help: "How many requests have occurred?",
+	})
+	//lint:ignore U1000 temporary
+	requestTime = promauto.NewHistogram(prometheus.HistogramOpts{
+		Name: "horizon_lite_request_duration",
+		Help: "How long do requests take?",
+		Buckets: append(
+			prometheus.LinearBuckets(0, 50, 20),
+			prometheus.LinearBuckets(1000, 1000, 8)...,
+		),
+	})
 )
 
-type Order string
-type ErrorMessage string
+type order string
+type errorMessage string
 
 const (
-	OrderAsc  Order = "asc"
-	OrderDesc Order = "desc"
+	orderAsc  order = "asc"
+	orderDesc order = "desc"
 )
 
 const (
-	ServerError             ErrorMessage = "Error: A problem occurred on the server while processing request"
-	InvalidPagingParameters ErrorMessage = "Error: Invalid paging parameters"
+	//TODO - refactor to use horizon 'problems' package
+	serverError             errorMessage = "Error: A problem occurred on the server while processing request"
+	invalidPagingParameters errorMessage = "Error: Invalid paging parameters"
 )
 
-type Pagination struct {
-	Limit  int64
+type pagination struct {
+	Limit  uint64
 	Cursor int64
-	Order
+	Order  order
 }
 
 func sendPageResponse(w http.ResponseWriter, page hal.Page) {
@@ -47,48 +66,68 @@ func sendPageResponse(w http.ResponseWriter, page hal.Page) {
 
 func sendErrorResponse(w http.ResponseWriter, errorCode int, errorMsg string) {
 	if errorMsg != "" {
-		http.Error(w, errorMsg, errorCode)
+		http.Error(w, fmt.Sprintf("Error: %s", errorMsg), errorCode)
 	} else {
-		http.Error(w, string(ServerError), errorCode)
+		http.Error(w, string(serverError), errorCode)
 	}
 }
 
-func RequestUnaryParam(r *http.Request, paramName string) (string, error) {
+func requestUnaryParam(r *http.Request, paramName string) (string, error) {
 	query, err := url.ParseQuery(r.URL.RawQuery)
 	if err != nil {
 		return "", err
 	}
 	return query.Get(paramName), nil
 }
 
-func Paging(r *http.Request) (Pagination, error) {
-	paginate := Pagination{
-		Order: OrderAsc,
+func paging(r *http.Request) (pagination, error) {
+	paginate := pagination{
+		Order: orderAsc,
 	}
 
-	if cursorRequested, err := RequestUnaryParam(r, "cursor"); err != nil {
-		return Pagination{}, err
+	if cursorRequested, err := requestUnaryParam(r, "cursor"); err != nil {
+		return pagination{}, err
 	} else if cursorRequested != "" {
 		paginate.Cursor, err = strconv.ParseInt(cursorRequested, 10, 64)
 		if err != nil {
-			return Pagination{}, err
+			return pagination{}, err
 		}
 	}
 
-	if limitRequested, err := RequestUnaryParam(r, "limit"); err != nil {
-		return Pagination{}, err
+	if limitRequested, err := requestUnaryParam(r, "limit"); err != nil {
+		return pagination{}, err
 	} else if limitRequested != "" {
-		paginate.Limit, err = strconv.ParseInt(limitRequested, 10, 64)
+		paginate.Limit, err = strconv.ParseUint(limitRequested, 10, 64)
 		if err != nil {
-			return Pagination{}, err
+			return pagination{}, err
 		}
 	}
 
-	if orderRequested, err := RequestUnaryParam(r, "order"); err != nil {
-		return Pagination{}, err
-	} else if orderRequested != "" && orderRequested == string(OrderDesc) {
-		paginate.Order = OrderDesc
+	if orderRequested, err := requestUnaryParam(r, "order"); err != nil {
+		return pagination{}, err
+	} else if orderRequested != "" && orderRequested == string(orderDesc) {
+		paginate.Order = orderDesc
 	}
 
 	return paginate, nil
 }
+
+func getURLParam(r *http.Request, key string) (string, bool) {
+	rctx := chi.RouteContext(r.Context())
+
+	if rctx == nil {
+		return "", false
+	}
+
+	if len(rctx.URLParams.Keys) != len(rctx.URLParams.Values) {
+		return "", false
+	}
+
+	for k := len(rctx.URLParams.Keys) - 1; k >= 0; k-- {
+		if rctx.URLParams.Keys[k] == key {
+			return rctx.URLParams.Values[k], true
+		}
+	}
+
+	return "", false
+}