forked from stellar/go
/
actions_ledger.go
122 lines (107 loc) · 3.12 KB
/
actions_ledger.go
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package horizon
import (
"github.com/stellar/go/services/horizon/internal/db2"
"github.com/stellar/go/services/horizon/internal/db2/history"
"github.com/stellar/go/services/horizon/internal/ledger"
"github.com/stellar/go/services/horizon/internal/render/hal"
"github.com/stellar/go/services/horizon/internal/render/problem"
"github.com/stellar/go/services/horizon/internal/render/sse"
"github.com/stellar/go/services/horizon/internal/resource"
halRender "github.com/stellar/go/support/render/hal"
)
// This file contains the actions:
//
// LedgerIndexAction: pages of ledgers
// LedgerShowAction: single ledger by sequence
// LedgerIndexAction renders a page of ledger resources, identified by
// a normal page query.
type LedgerIndexAction struct {
Action
PagingParams db2.PageQuery
Records []history.Ledger
Page hal.Page
}
// JSON is a method for actions.JSON
func (action *LedgerIndexAction) JSON() {
action.Do(
action.EnsureHistoryFreshness,
action.loadParams,
action.ValidateCursorWithinHistory,
action.loadRecords,
action.loadPage,
func() { halRender.Render(action.W, action.Page) },
)
}
// SSE is a method for actions.SSE
func (action *LedgerIndexAction) SSE(stream sse.Stream) {
action.Setup(
action.EnsureHistoryFreshness,
action.loadParams,
action.ValidateCursorWithinHistory,
)
action.Do(
action.loadRecords,
func() {
stream.SetLimit(int(action.PagingParams.Limit))
records := action.Records[stream.SentCount():]
for _, record := range records {
var res resource.Ledger
res.Populate(action.Ctx, record)
stream.Send(sse.Event{ID: res.PagingToken(), Data: res})
}
},
)
}
func (action *LedgerIndexAction) loadParams() {
action.ValidateCursorAsDefault()
action.PagingParams = action.GetPageQuery()
}
func (action *LedgerIndexAction) loadRecords() {
action.Err = action.HistoryQ().Ledgers().
Page(action.PagingParams).
Select(&action.Records)
}
func (action *LedgerIndexAction) loadPage() {
for _, record := range action.Records {
var res resource.Ledger
res.Populate(action.Ctx, record)
action.Page.Add(res)
}
action.Page.FullURL = action.FullURL()
action.Page.Limit = action.PagingParams.Limit
action.Page.Cursor = action.PagingParams.Cursor
action.Page.Order = action.PagingParams.Order
action.Page.PopulateLinks()
}
// LedgerShowAction renders a ledger found by its sequence number.
type LedgerShowAction struct {
Action
Sequence int32
Record history.Ledger
}
// JSON is a method for actions.JSON
func (action *LedgerShowAction) JSON() {
action.Do(
action.EnsureHistoryFreshness,
action.loadParams,
action.verifyWithinHistory,
action.loadRecord,
func() {
var res resource.Ledger
res.Populate(action.Ctx, action.Record)
halRender.Render(action.W, res)
},
)
}
func (action *LedgerShowAction) loadParams() {
action.Sequence = action.GetInt32("id")
}
func (action *LedgerShowAction) loadRecord() {
action.Err = action.HistoryQ().
LedgerBySequence(&action.Record, action.Sequence)
}
func (action *LedgerShowAction) verifyWithinHistory() {
if action.Sequence < ledger.CurrentState().HistoryElder {
action.Err = &problem.BeforeHistory
}
}