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server_billable_handler.go
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server_billable_handler.go
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package apiserver
import (
"context"
"encoding/json"
"fmt"
"net/http"
"strconv"
"time"
"github.com/alphagov/paas-billing/apiserver/auth"
"github.com/alphagov/paas-billing/eventio"
"github.com/labstack/echo/v4"
)
func BillableEventsHandler(store eventio.BillableEventReader, consolidatedStore eventio.ConsolidatedBillableEventReader, uaa auth.Authenticator) echo.HandlerFunc {
return func(c echo.Context) error {
sentOKHeader := false
sendOKHeader := func() error {
c.Response().Header().Set(echo.HeaderContentType, echo.MIMEApplicationJSONCharsetUTF8)
c.Response().WriteHeader(http.StatusOK)
if _, err := c.Response().Write([]byte("[\n")); err != nil {
return err
}
c.Response().Flush()
sentOKHeader = true
return nil
}
requestedOrgs := c.Request().URL.Query()["org_guid"]
if ok, err := authorize(c, uaa, requestedOrgs); err != nil {
return echo.NewHTTPError(http.StatusUnauthorized, err)
} else if !ok {
return echo.NewHTTPError(http.StatusUnauthorized, "unauthorized")
}
// parse params
filter := eventio.EventFilter{
RangeStart: c.QueryParam("range_start"),
RangeStop: c.QueryParam("range_stop"),
OrgGUIDs: requestedOrgs,
}
if err := filter.Validate(); err != nil {
return echo.NewHTTPError(http.StatusBadRequest, err)
}
storeCtx, cancel := context.WithCancel(context.Background())
defer cancel()
months, err := filter.SplitByMonth()
if err != nil {
return err
}
delim := ""
for _, monthFilter := range months {
err := func() error { // so we can use defer in-loop
isConsolidated, err := consolidatedStore.IsRangeConsolidated(monthFilter)
if err != nil {
return err
}
var rows eventio.BillableEventRows
if isConsolidated {
rows, err = consolidatedStore.GetConsolidatedBillableEventRows(storeCtx, monthFilter)
} else {
rows, err = store.GetBillableEventRows(storeCtx, monthFilter)
}
if err != nil {
return err
}
defer rows.Close()
// Assume rows is a slice of event data
taskEvents := make(map[string]*eventio.BillableEvent)
next := rows.Next()
for next {
b, err := rows.EventJSON()
// Check if the resource type is "task"
row, err := rows.Event()
if row != nil && row.ResourceType == "task" {
// Set the key as a combination of Org GUID and Space GUID
key := fmt.Sprintf("%s-%s", row.OrgGUID, row.SpaceGUID)
// Convert the price values to float
priceInc, _ := strconv.ParseFloat(row.Price.IncVAT, 64)
priceEx, _ := strconv.ParseFloat(row.Price.ExVAT, 64)
event, exists := taskEvents[key]
if !exists {
const layout = "2006-01-02"
rangeStart, _ := time.Parse(layout, c.QueryParam("range_start"))
rangeStop, _ := time.Parse(layout, c.QueryParam("range_stop"))
event = &eventio.BillableEvent{
EventGUID: row.EventGUID,
EventStart: rangeStart.Format("2006-01-02T00:00:00+00:00"),
EventStop: rangeStop.Format("2006-01-02T00:00:00+00:00"),
ResourceGUID: row.ResourceGUID,
ResourceName: "Total Task Events",
ResourceType: "task",
OrgGUID: row.OrgGUID,
OrgName: row.OrgName,
SpaceGUID: row.SpaceGUID,
SpaceName: row.SpaceName,
PlanGUID: row.PlanGUID,
PlanName: row.PlanName,
QuotaDefinitionGUID: row.QuotaDefinitionGUID,
Price: eventio.Price{
Details: []eventio.PriceComponent{{
Name: "All tasks aggregated",
PlanName: "tasks",
Start: rangeStart.Format("2006-01-02T00:00:00+00:00"),
Stop: rangeStop.Format("2006-01-02T00:00:00+00:00"),
CurrencyCode: "USD",
VatRate: "0.2",
}},
FloatIncVAT: priceInc,
FloatExVAT: priceEx,
},
}
taskEvents[key] = event
} else {
// Add this priceInc to event.Price.IncVAT
event.Price.FloatIncVAT = event.Price.FloatIncVAT + priceInc
event.Price.FloatExVAT = event.Price.FloatExVAT + priceEx
}
// Skip the event as we will group them all into one event at the end
next = rows.Next()
continue
}
if err != nil {
return err
}
if !sentOKHeader {
// this is sent as late as possible because any errors encountered after
// this won't be communicated to the client correctly
if err := sendOKHeader(); err != nil {
return err
}
}
if _, err := c.Response().Write([]byte(delim)); err != nil {
return err
}
if _, err := c.Response().Write(b); err != nil {
return err
}
delim = ",\n"
next = rows.Next()
c.Response().Flush()
}
// loop over each task event and send it
for _, event := range taskEvents {
event.Price.IncVAT = fmt.Sprintf("%.16f", event.Price.FloatIncVAT)
event.Price.ExVAT = fmt.Sprintf("%.16f", event.Price.FloatExVAT)
event.Price.Details[0].IncVAT = fmt.Sprintf("%.16f", event.Price.FloatIncVAT)
event.Price.Details[0].ExVAT = fmt.Sprintf("%.16f", event.Price.FloatExVAT)
b, err := json.Marshal(event)
if err != nil {
return err
}
// send the delimiter
if _, err := c.Response().Write([]byte(",\n")); err != nil {
return err
}
if _, err := c.Response().Write(b); err != nil {
return err
}
c.Response().Flush()
}
return nil
}()
if err != nil {
return err
}
}
if !sentOKHeader {
if err := sendOKHeader(); err != nil {
return err
}
}
if _, err := c.Response().Write([]byte("\n]\n")); err != nil {
return err
}
return nil
}
}