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claimable_balance.go
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/
claimable_balance.go
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package actions
import (
"context"
"net/http"
"strings"
"github.com/pownieh/stellar_go/protocols/horizon"
protocol "github.com/pownieh/stellar_go/protocols/horizon"
horizonContext "github.com/pownieh/stellar_go/services/horizon/internal/context"
"github.com/pownieh/stellar_go/services/horizon/internal/db2/history"
"github.com/pownieh/stellar_go/services/horizon/internal/ledger"
"github.com/pownieh/stellar_go/services/horizon/internal/resourceadapter"
"github.com/pownieh/stellar_go/support/errors"
"github.com/pownieh/stellar_go/support/render/hal"
"github.com/pownieh/stellar_go/support/render/problem"
"github.com/pownieh/stellar_go/xdr"
)
// GetClaimableBalanceByIDHandler is the action handler for all end-points returning a claimable balance.
type GetClaimableBalanceByIDHandler struct{}
// ClaimableBalanceQuery query struct for claimables_balances/id end-point
type ClaimableBalanceQuery struct {
ID string `schema:"id" valid:"claimableBalanceID,required"`
}
// GetResource returns an claimable balance page.
func (handler GetClaimableBalanceByIDHandler) GetResource(w HeaderWriter, r *http.Request) (interface{}, error) {
ctx := r.Context()
qp := ClaimableBalanceQuery{}
err := getParams(&qp, r)
if err != nil {
return nil, err
}
historyQ, err := horizonContext.HistoryQFromRequest(r)
if err != nil {
return nil, err
}
cb, err := historyQ.FindClaimableBalanceByID(ctx, qp.ID)
if err != nil {
return nil, err
}
ledger := &history.Ledger{}
err = historyQ.LedgerBySequence(ctx,
ledger,
int32(cb.LastModifiedLedger),
)
if historyQ.NoRows(err) {
ledger = nil
} else if err != nil {
return nil, errors.Wrap(err, "LedgerBySequence error")
}
var resource protocol.ClaimableBalance
err = resourceadapter.PopulateClaimableBalance(ctx, &resource, cb, ledger)
if err != nil {
return nil, err
}
return resource, nil
}
// ClaimableBalancesQuery query struct for claimable_balances end-point
type ClaimableBalancesQuery struct {
AssetFilter string `schema:"asset" valid:"asset,optional"`
SponsorFilter string `schema:"sponsor" valid:"accountID,optional"`
ClaimantFilter string `schema:"claimant" valid:"accountID,optional"`
}
func (q ClaimableBalancesQuery) asset() *xdr.Asset {
if len(q.AssetFilter) > 0 {
switch q.AssetFilter {
case "native":
asset := xdr.MustNewNativeAsset()
return &asset
default:
parts := strings.Split(q.AssetFilter, ":")
asset := xdr.MustNewCreditAsset(parts[0], parts[1])
return &asset
}
}
return nil
}
func (q ClaimableBalancesQuery) sponsor() *xdr.AccountId {
if q.SponsorFilter != "" {
return xdr.MustAddressPtr(q.SponsorFilter)
}
return nil
}
func (q ClaimableBalancesQuery) claimant() *xdr.AccountId {
if q.ClaimantFilter != "" {
return xdr.MustAddressPtr(q.ClaimantFilter)
}
return nil
}
// URITemplate returns a rfc6570 URI template the query struct
func (q ClaimableBalancesQuery) URITemplate() string {
return getURITemplate(&q, "claimable_balances", true)
}
type GetClaimableBalancesHandler struct {
LedgerState *ledger.State
}
// GetResourcePage returns a page of claimable balances.
func (handler GetClaimableBalancesHandler) GetResourcePage(
w HeaderWriter,
r *http.Request,
) ([]hal.Pageable, error) {
ctx := r.Context()
qp := ClaimableBalancesQuery{}
err := getParams(&qp, r)
if err != nil {
return nil, err
}
pq, err := GetPageQuery(handler.LedgerState, r, DisableCursorValidation)
if err != nil {
return nil, err
}
query := history.ClaimableBalancesQuery{
PageQuery: pq,
Asset: qp.asset(),
Sponsor: qp.sponsor(),
Claimant: qp.claimant(),
}
_, _, err = query.Cursor()
if err != nil {
return nil, problem.MakeInvalidFieldProblem(
"cursor",
errors.New("The first part should be a number higher than 0 and the second part should be a valid claimable balance ID"),
)
}
historyQ, err := horizonContext.HistoryQFromRequest(r)
if err != nil {
return nil, err
}
claimableBalances, err := getClaimableBalancesPage(ctx, historyQ, query)
if err != nil {
return nil, err
}
return claimableBalances, nil
}
func getClaimableBalancesPage(ctx context.Context, historyQ *history.Q, query history.ClaimableBalancesQuery) ([]hal.Pageable, error) {
records, err := historyQ.GetClaimableBalances(ctx, query)
if err != nil {
return nil, err
}
ledgerCache := history.LedgerCache{}
for _, record := range records {
ledgerCache.Queue(int32(record.LastModifiedLedger))
}
if err := ledgerCache.Load(ctx, historyQ); err != nil {
return nil, errors.Wrap(err, "failed to load ledger batch")
}
var claimableBalances []hal.Pageable
for _, record := range records {
var response horizon.ClaimableBalance
var ledger *history.Ledger
if l, ok := ledgerCache.Records[int32(record.LastModifiedLedger)]; ok {
ledger = &l
}
resourceadapter.PopulateClaimableBalance(ctx, &response, record, ledger)
claimableBalances = append(claimableBalances, response)
}
return claimableBalances, nil
}