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server_usage_handler.go
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/
server_usage_handler.go
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package apiserver
import (
"net/http"
"github.com/alphagov/paas-billing/apiserver/auth"
"github.com/alphagov/paas-billing/eventio"
"github.com/labstack/echo/v4"
)
func UsageEventsHandler(store eventio.UsageEventReader, uaa auth.Authenticator) echo.HandlerFunc {
return func(c echo.Context) error {
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)
}
// query the store
rows, err := store.GetUsageEventRows(filter)
if err != nil {
return err
}
defer rows.Close()
// stream response to client
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()
next := rows.Next()
delim := "\n"
for next {
b, err := rows.EventJSON()
if err != nil {
return err
}
if _, err := c.Response().Write(b); err != nil {
return err
}
next = rows.Next()
if next {
delim = ",\n"
} else {
delim = "\n"
}
if _, err := c.Response().Write([]byte(delim)); err != nil {
return err
}
c.Response().Flush()
}
if _, err := c.Response().Write([]byte("]\n")); err != nil {
return err
}
c.Response().Flush()
return rows.Err()
}
}