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package compat
import (
"fmt"
"net/http"
"sync"
"github.com/containers/libpod/v2/libpod"
"github.com/containers/libpod/v2/libpod/events"
"github.com/containers/libpod/v2/pkg/api/handlers/utils"
"github.com/containers/libpod/v2/pkg/domain/entities"
"github.com/gorilla/schema"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
func GetEvents(w http.ResponseWriter, r *http.Request) {
var (
fromStart bool
decoder = r.Context().Value("decoder").(*schema.Decoder)
runtime = r.Context().Value("runtime").(*libpod.Runtime)
json = jsoniter.ConfigCompatibleWithStandardLibrary // FIXME: this should happen on the package level
)
query := struct {
Since string `schema:"since"`
Until string `schema:"until"`
Filters map[string][]string `schema:"filters"`
Stream bool `schema:"stream"`
}{
Stream: true,
}
if err := decoder.Decode(&query, r.URL.Query()); err != nil {
utils.Error(w, "Failed to parse parameters", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
return
}
var libpodFilters = []string{}
if _, found := r.URL.Query()["filters"]; found {
for k, v := range query.Filters {
if len(v) == 0 {
utils.Error(w, "Failed to parse parameters", http.StatusBadRequest, errors.Errorf("empty value for filter %q", k))
return
}
libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", k, v[0]))
}
}
if len(query.Since) > 0 || len(query.Until) > 0 {
fromStart = true
}
eventChannel := make(chan *events.Event)
errorChannel := make(chan error)
// Start reading events.
go func() {
readOpts := events.ReadOptions{
FromStart: fromStart,
Stream: query.Stream,
Filters: libpodFilters,
EventChannel: eventChannel,
Since: query.Since,
Until: query.Until,
}
errorChannel <- runtime.Events(r.Context(), readOpts)
}()
var coder *jsoniter.Encoder
var writeHeader sync.Once
for stream := true; stream; stream = query.Stream {
select {
case err := <-errorChannel:
if err != nil {
utils.InternalServerError(w, err)
return
}
case evt := <-eventChannel:
writeHeader.Do(func() {
// Use a sync.Once so that we write the header
// only once.
w.Header().Set("Content-Type", "application/json")
w.WriteHeader(http.StatusOK)
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
coder = json.NewEncoder(w)
coder.SetEscapeHTML(true)
})
if evt == nil {
continue
}
e := entities.ConvertToEntitiesEvent(*evt)
if err := coder.Encode(e); err != nil {
logrus.Errorf("unable to write json: %q", err)
}
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
}
}
}
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