add s3 circuit breaker support for 'simultaneous request count' and 'simultaneous request bytes' limitations

configure s3 circuit breaker by 'command_s3_circuitbreaker.go':
usage eg:
# Configure the number of simultaneous global (current s3api node) requests
s3.circuit.breaker -global -type count -actions Write -values 1000 -apply

# Configure the number of simultaneous requests for bucket x read and write
s3.circuit.breaker -buckets -type count -actions Read,Write -values 1000 -apply

# Configure the total bytes of simultaneous requests for bucket write
s3.circuit.breaker -buckets -type bytes -actions Write -values 100MiB -apply

# Disable circuit breaker config of bucket 'x'
s3.circuit.breaker -buckets x -enable false -apply

# Delete circuit breaker config of bucket 'x'
s3.circuit.breaker -buckets x -delete -apply

1 files changed, 13 insertions, 0 deletions

diff --git a/weed/s3api/s3err/s3api_errors.go b/weed/s3api/s3err/s3api_errors.go
index 2e93f49cb..57f269a2e 100644
--- a/weed/s3api/s3err/s3api_errors.go
+++ b/weed/s3api/s3err/s3api_errors.go
@@ -104,6 +104,9 @@ const (
 
 	ErrExistingObjectIsDirectory
 	ErrExistingObjectIsFile
+
+	ErrTooManyRequest
+	ErrRequestBytesExceed
 )
 
 // error code to APIError structure, these fields carry respective
@@ -401,6 +404,16 @@ var errorCodeResponse = map[ErrorCode]APIError{
 		Description:    "Existing Object is a file.",
 		HTTPStatusCode: http.StatusConflict,
 	},
+	ErrTooManyRequest: {
+		Code:           "ErrTooManyRequest",
+		Description:    "Too many simultaneous request count",
+		HTTPStatusCode: http.StatusTooManyRequests,
+	},
+	ErrRequestBytesExceed: {
+		Code:           "ErrRequestBytesExceed",
+		Description:    "Simultaneous request bytes exceed limitations",
+		HTTPStatusCode: http.StatusTooManyRequests,
+	},
 }
 
 // GetAPIError provides API Error for input API error code.