Contents

• ImageStore Module
  • Configuration
    • Detailed description on each of the keys used

ImageStore Module

The Image Store component of EII comes as a separate container which primarily subscribes to the stream that comes out of the VideoAnalytics app via EII MessageBus and stores the frame into minio for historical analysis.

The high level logical flow of ImageStore is as below:

1. The messagebus subscriber in ImageStore will subscribe to the VideoAnalytics published classified result (metadata, frame) on the messagebus. The img_handle is extracted out of the metadata and is used as the key and the frame is stored as a value for that key in minio persistent storage.
2. For historical analysis of the stored classified images, ImageStore starts the messagebus server which provides the read and store interfaces. The payload format is as follows for:
   • Store interface:

        Request: map ("command": "store","img_handle":"$handle_name"),[]byte($binaryImage)
        Response : map ("img_handle":"$handle_name", "error":"$error_msg") ("error" is optional and available only in case of error in execution.)
     

   • Read interface:

        Request : map ("command": "read", "img_handle":"$handle_name")
        Response : map ("img_handle":"$handle_name", "error":"$error_msg"),[]byte($binaryImage) ("error" is optional and available only in case of error in execution. And $binaryImage is available only in case of successful read)
     

Configuration

All the ImageStore module configuration are added into etcd (distributed key-value data store) under AppName as mentioned in the environment section of this app's service definition in docker-compose.

If AppName is ImageStore, then the app's config would look like as below for /ImageStore/config key in Etcd:

   "/ImageStore/config": {
       "minio":{
          "accessKey":"admin",
          "secretKey":"password",
          "retentionTime":"1h",
          "retentionPollInterval":"60s",
          "ssl":"false"
       }
   }

Detailed description on each of the keys used

Key	Description	Possible Values	Required/Optional
accessKey	Username required to access Minio DB	Any suitable value	Required
secretKey	Password required to access Minio DB	Any suitable value	Required
retentionTime	The retention parameter specifies the retention policy to apply for the images stored in Minio DB. In case of infinite retention time, set it to "-1"	Suitable duration string value as mentioned at https://golang.org/pkg/time/#ParseDuration.	Required
retentionPollInterval	Used to set the time interval for checking images for expiration. Expired images will become candidates for deletion and no longer retained. In case of infinite retention time, this attribute will be ignored	Suitable duration string value as mentioned at https://golang.org/pkg/time/#ParseDuration	Required
ssl	If "true", establishes a secure connection with Minio DB else a non-secure connection	"true" or "false"	Required

For more details on Etcd secrets and messagebus endpoint configuration, visit Etcd_Secrets_Configuration.md and MessageBus Configuration respectively.