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|
package compat
import (
"encoding/json"
"fmt"
"net/http"
"sync"
"github.com/containers/podman/v2/libpod"
"github.com/containers/podman/v2/libpod/events"
"github.com/containers/podman/v2/pkg/api/handlers/utils"
"github.com/containers/podman/v2/pkg/domain/entities"
"github.com/gorilla/schema"
jsoniter "github.com/json-iterator/go"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
// filtersFromRequests extracts the "filters" parameter from the specified
// http.Request. The parameter can either be a `map[string][]string` as done
// in new versions of Docker and libpod, or a `map[string]map[string]bool` as
// done in older versions of Docker. We have to do a bit of Yoga to support
// both - just as Docker does as well.
//
// Please refer to https://github.com/containers/podman/issues/6899 for some
// background.
func filtersFromRequest(r *http.Request) ([]string, error) {
var (
compatFilters map[string]map[string]bool
filters map[string][]string
libpodFilters []string
raw []byte
)
if _, found := r.URL.Query()["filters"]; found {
raw = []byte(r.Form.Get("filters"))
} else {
return []string{}, nil
}
// Backwards compat with older versions of Docker.
if err := json.Unmarshal(raw, &compatFilters); err == nil {
for filterKey, filterMap := range compatFilters {
for filterValue, toAdd := range filterMap {
if toAdd {
libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", filterKey, filterValue))
}
}
}
return libpodFilters, nil
}
if err := json.Unmarshal(raw, &filters); err != nil {
return nil, err
}
for filterKey, filterSlice := range filters {
for _, filterValue := range filterSlice {
libpodFilters = append(libpodFilters, fmt.Sprintf("%s=%s", filterKey, filterValue))
}
}
return libpodFilters, nil
}
// NOTE: this endpoint serves both the docker-compatible one and the new libpod
// one.
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
)
// NOTE: the "filters" parameter is extracted separately for backwards
// compat via `fitlerFromRequest()`.
query := struct {
Since string `schema:"since"`
Until string `schema:"until"`
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
}
if len(query.Since) > 0 || len(query.Until) > 0 {
fromStart = true
}
libpodFilters, err := filtersFromRequest(r)
if err != nil {
utils.Error(w, "Failed to parse parameters", http.StatusBadRequest, errors.Wrapf(err, "Failed to parse parameters for %s", r.URL.String()))
return
}
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()
}
}
}
}
|
