Add madmin package context support (#9172)

This is to improve responsiveness for all
admin API operations and allowing callers
to cancel any on-going admin operations,
if they happen to be waiting too long.

pkg/madmin/api-log.go

@@ -17,18 +17,17 @@
 package madmin
 
 import (
+	"context"
 	"encoding/json"
 	"net/http"
 	"net/url"
 	"strconv"
 	"strings"
-
-	"github.com/minio/minio/cmd/logger/message/log"
 )
 
 // LogInfo holds console log messages
 type LogInfo struct {
-	log.Entry
+	logEntry
 	ConsoleMsg string
 	NodeName   string `json:"node"`
 	Err        error  `json:"-"`
@@ -42,7 +41,7 @@ func (l LogInfo) SendLog(node, logKind string) bool {
 }
 
 // GetLogs - listen on console log messages.
-func (adm AdminClient) GetLogs(node string, lineCnt int, logKind string, doneCh <-chan struct{}) <-chan LogInfo {
+func (adm AdminClient) GetLogs(ctx context.Context, node string, lineCnt int, logKind string) <-chan LogInfo {
 	logCh := make(chan LogInfo, 1)
 
 	// Only success, start a routine to start reading line by line.
@@ -58,7 +57,7 @@ func (adm AdminClient) GetLogs(node string, lineCnt int, logKind string, doneCh
 				queryValues: urlValues,
 			}
 			// Execute GET to call log handler
-			resp, err := adm.executeMethod("GET", reqData)
+			resp, err := adm.executeMethod(ctx, http.MethodGet, reqData)
 			if err != nil {
 				closeResponse(resp)
 				return
@@ -75,7 +74,7 @@ func (adm AdminClient) GetLogs(node string, lineCnt int, logKind string, doneCh
 					break
 				}
 				select {
-				case <-doneCh:
+				case <-ctx.Done():
 					return
 				case logCh <- info:
 				}