[WIP] logging refactor (#1794)

* refactor logging

Signed-off-by: huanggze <loganhuang@yunify.com>

* refactor logging

Signed-off-by: huanggze <loganhuang@yunify.com>

pkg/simple/client/logging/interface.go

@@ -0,0 +1,69 @@
+package logging
+
+import (
+	"io"
+	"time"
+)
+
+type Interface interface {
+	// Current stats about log store, eg. total number of logs and containers
+	GetCurrentStats(sf SearchFilter) (Statistics, error)
+
+	CountLogsByInterval(sf SearchFilter, interval string) (Histogram, error)
+
+	SearchLogs(sf SearchFilter, from, size int64, order string) (Logs, error)
+
+	ExportLogs(sf SearchFilter, w io.Writer) error
+}
+
+// Log search result
+type Logs struct {
+	Total   int64    `json:"total" description:"total number of matched results"`
+	Records []Record `json:"records,omitempty" description:"actual array of results"`
+}
+
+type Record struct {
+	Log       string `json:"log,omitempty" description:"log message"`
+	Time      string `json:"time,omitempty" description:"log timestamp"`
+	Namespace string `json:"namespace,omitempty" description:"namespace"`
+	Pod       string `json:"pod,omitempty" description:"pod name"`
+	Container string `json:"container,omitempty" description:"container name"`
+}
+
+// Log statistics result
+type Statistics struct {
+	Containers int64 `json:"containers" description:"total number of containers"`
+	Logs       int64 `json:"logs" description:"total number of logs"`
+}
+
+// Log count result by interval
+type Histogram struct {
+	Total   int64    `json:"total" description:"total number of logs"`
+	Buckets []Bucket `json:"histograms" description:"actual array of histogram results"`
+}
+
+type Bucket struct {
+	Time  int64 `json:"time" description:"timestamp"`
+	Count int64 `json:"count" description:"total number of logs at intervals"`
+}
+
+// General query conditions
+type SearchFilter struct {
+	// xxxSearch for literal matching
+	// xxxfilter for fuzzy matching
+
+	// To prevent disclosing archived logs of a reopened namespace,
+	// NamespaceFilter records the namespace creation time.
+	// Any query to this namespace must begin after its creation.
+	NamespaceFilter map[string]time.Time
+	WorkloadSearch  []string
+	WorkloadFilter  []string
+	PodSearch       []string
+	PodFilter       []string
+	ContainerSearch []string
+	ContainerFilter []string
+	LogSearch       []string
+
+	Starttime time.Time
+	Endtime   time.Time
+}