# Transaction tracker

The transaction tracker is responsible for saving transaction metadata to the Operational snapshot after a successfully executed commit or checked-commit RPC. Transaction metadata contains information about performed transactions, such as the following:

transaction-id - Identifier for transaction.
type-of-commit-time - Timestamp for either last-commit-time (if the transaction was successful) or failed-commit-time (if the transaction failed). If multiple devices are configured, last-commit-time contains a timestamp for the last update on the last device.
metadata - Items in this field represent nodes configured in the transaction. Each item contains a diff item with additional information.
diff - Items in this field are specific changes. Each item contains a path to changes, data before the change and data after the change. For failed transactions, this information is not included.
topology - Which topology the node is installed on. Either uniconfig or unistore.

Data-before is visible only if data was updated or deleted. Data-after is visible only if data was updated or created.

]

# Configuration

By default, UniConfig stores transaction metadata. Their removal depends only on the transactions.max-transaction-age parameter.

# Grouped settings that are related to UniConfig transactions

# Time after transaction can be closed [seconds] by transaction cleaner.
transactions.transaction-idle-time-out=300
# Maximum transaction age before it can be evicted from transaction registry [seconds].
# Configuring '0' disables cleaning of UniConfig transactions.
transactions.max-transaction-age=0
# Interval at which expired transactions are closed and cleaned [seconds].
# Expired transaction: transaction which age exceeds 'maxTransactionAge' setting.
# Only dedicated UniConfig transactions (initialized using 'create-transaction' RPC)
# are cleaned - shared transaction is never removed or invalidated.
# Configuring '0' disables cleaning of UniConfig transactions.
transactions.cleaning-interval=0
# Boolean value if the Immediate Commit Model is enabled or not. Default value is true.
# If disabled, only manually created transactions can exist.
transactions.immediate-commit-enabled=true

# Show transaction-metadata

The response to this GET request contains all stored transaction metadata, transaction ids and other items such as node id, updated data before and after update, etc.

RPC Request
curl --location --request GET 'http://localhost:8181/rests/data/transaction-log:transactions-metadata' \
--header 'Accept: application/json'

RPC Response, Status: 200
{
  "transactions-metadata": {
    "transaction-metadata": [
      {
        "transaction-id": "221aa4a5-e32e-46fd-921a-83314b190e89",
        "status": "SUCCESS",
        "metadata": [
          {
            "node-id": "xr6unistore",
            "diff": [
              {
                "path": "/Cisco-IOS-XR-ifmgr-cfg:interface-configurations/interface-configuration=act,Bundle-Ether1/description",
                "data-after": "{\n  \"Cisco-IOS-XR-ifmgr-cfg:description\": \"bundle-ether1-description-create\"\n}"
              },
              {
                "path": "/Cisco-IOS-XR-ifmgr-cfg:interface-configurations/interface-configuration=act,Bundle-Ether2/description",
                "data-before": "{\n  \"Cisco-IOS-XR-ifmgr-cfg:description\": \"bundle-ether2-description-before\"\n}",
                "data-after": "{\n  \"Cisco-IOS-XR-ifmgr-cfg:description\": \"bundle-ether2-description-after\"\n}"
              }
            ],
            "topology": "unistore"
          }
        ],
        "last-commit-time": "2021-Mar-09 10:53:59.102 +0100"
      },
      {
        "transaction-id": "869df9d6-9025-4849-b30b-9db4d8fb26ec",
        "status": "SUCCESS",
        "metadata": [
          {
            "node-id": "xr5",
            "diff": [
              {
                "path": "/frinx-openconfig-interfaces:interfaces/interface=Loopback123/config",
                "data-before": "{\n  \"frinx-openconfig-interfaces:config\": {\n    \"type\": \"iana-if-type:softwareLoopback\",\n    \"enabled\": true,\n    \"name\": \"Loopback123\"\n  }\n}",
                "data-after": "{\n  \"frinx-openconfig-interfaces:config\": {\n    \"type\": \"iana-if-type:softwareLoopback\",\n    \"enabled\": true,\n    \"description\": \"test-description\",\n    \"name\": \"Loopback123\"\n  }\n}"
              }
            ],
            "topology": "uniconfig"
          }
        ],
        "last-commit-time": "2021-Mar-09 11:06:58.000 +0100"
      },
      {
        "transaction-id": "88878588-ad67-424a-9a16-5e7360df7df0",
        "status": "FAILED",
        "failed-commit-time": "2022-Mar-11 14:39:32.813 +0100"
      }
    ]
  }
}