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authorValentin Rothberg <rothberg@redhat.com>2020-07-20 14:44:05 +0200
committerValentin Rothberg <rothberg@redhat.com>2020-07-20 15:05:04 +0200
commitdea93c27d2809cd5a04563d27cf00a8e682884c8 (patch)
tree446322deeff9b577925344f67537d6303cbdfdeb /pkg/api/handlers
parentd856e87f4002fa520594a2c843cb7e3b002cbb6e (diff)
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events endpoint: backwards compat to old type
The versions Docker that the compat endpoints currently support are using another type for the `filters` parameter than later versions of Docker, which the libpod/events endpoint is also using. To prevent existing deplopyments from breaking while still achieving backward compat, we now support both types for the filters parameter. Tested manually. Fixes: #6899 Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Diffstat (limited to 'pkg/api/handlers')
-rw-r--r--pkg/api/handlers/compat/events.go70
1 files changed, 55 insertions, 15 deletions
diff --git a/pkg/api/handlers/compat/events.go b/pkg/api/handlers/compat/events.go
index 3fc8248d6..9d5cb5045 100644
--- a/pkg/api/handlers/compat/events.go
+++ b/pkg/api/handlers/compat/events.go
@@ -1,6 +1,7 @@
package compat
import (
+ "encoding/json"
"fmt"
"net/http"
"sync"
@@ -15,6 +16,49 @@ import (
"github.com/sirupsen/logrus"
)
+// filtersFromRequests extracts the "filters" parameter from the specified
+// http.Request. The paramater 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(r.Form.Get("filters"))
+
+ // 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
@@ -23,11 +67,12 @@ func GetEvents(w http.ResponseWriter, r *http.Request) {
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"`
- Filters map[string][]string `schema:"filters"`
- Stream bool `schema:"stream"`
+ Since string `schema:"since"`
+ Until string `schema:"until"`
+ Stream bool `schema:"stream"`
}{
Stream: true,
}
@@ -36,21 +81,16 @@ func GetEvents(w http.ResponseWriter, r *http.Request) {
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
}
+ 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)