# Access Logs

Subscribe to events, such as logs, using either [RPC Pub/Sub over WebSockets](/json-rpc-commands/rpc-pubsub.md) or filters over HTTP.

Access logs using the following ClishaChain API methods:

* [`eth_getFilterChanges`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterchanges)
* [`eth_getFilterLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterlogs)
* [`eth_getLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getlogs).

Use [`eth_newFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_newfilter) to create the filter before using [`eth_getFilterChanges`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterchanges) and [`eth_getFilterLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterlogs)).

```
The following examples use the sample contract included in [events and logs](../../concepts/events-and-logs.md).
```

## Create a filter

Create a filter using [`eth_newFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_newfilter).

!!! example

````
If the [example contract](../../concepts/events-and-logs.md) was deployed to
0x42699a7612a82f1d9c36148af9c77354759b210b, the following request for `eth_newFilter` creates a
filter to log when `valueIndexed` is set to 5:

```json
{
  "jsonrpc":"2.0",
  "method":"eth_newFilter",
  "params":[
    {
      "fromBlock":"earliest",
      "toBlock":"latest",
      "address":"0x42699a7612a82f1d9c36148af9c77354759b210b",
      "topics":[
        ["0xd3610b1c54575b7f4f0dc03d210b8ac55624ae007679b7a928a4f25a709331a8"],
        ["0x0000000000000000000000000000000000000000000000000000000000000005"]
      ]
    }
  ],
  "id":1
}
```
````

[`eth_newFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_newfilter) returns a filter ID hash (for example, `0x1ddf0c00989044e9b41cc0ae40272df3`).

### Poll a filter for changes

To poll the filter for changes since the last poll, use [`eth_getFilterChanges`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterchanges) with the filter ID hash returned by [`eth_newFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_newfilter).

!!! example

````
If the contract had been executed twice since the last poll, with `valueIndexed` set to 1 and
5, [`eth_getFilterChanges`](../../reference/api/index.md#eth_getfilterchanges) returns
only the log where the [topic](../../concepts/events-and-logs.md#event-parameters) for
`valueIndexed` is 5:

```json
{
    "jsonrpc": "2.0",
    "id": 1,
    "result": [
        {
            "logIndex": "0x0",
            "removed": false,
            "blockNumber": "0x21c",
            "blockHash": "0xc7e6c9d5b9f522b2c9d2991546be0a8737e587beb6628c056f3c327a44b45132",
            "transactionHash": "0xfd1a40f9fbf89c97b4545ec9db774c85e51dd8a3545f969418a22f9cb79417c5",
            "transactionIndex": "0x0",
            "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
            "data": "0x0000000000000000000000000000000000000000000000000000000000000005",
            "topics": [
                "0xd3610b1c54575b7f4f0dc03d210b8ac55624ae007679b7a928a4f25a709331a8",
                "0x0000000000000000000000000000000000000000000000000000000000000005"
            ]
        }
    ]
}
```
````

### Get all logs for a filter

To get all logs for a filter, use [`eth_getFilterLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getfilterlogs).

!!! example

````
If the contract had been executed twice with `valueIndexed` set to 5 since the filter was
created using `eth_newFilter`, `eth_getFilterLogs` returns:

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "result": [
    {
      "logIndex": "0x0",
      "removed": false,
      "blockNumber": "0x1a7",
      "blockHash": "0x4edda22a242ddc7bc51e2b6b11e63cd67be1af7389470cdea9c869768ff75d42",
      "transactionHash": "0x9535bf8830a72ca7d0020df0b547adc4d0ecc4321b7d5b5d6beb1eccee5c0afa",
      "transactionIndex": "0x0",
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
      "data": "0x0000000000000000000000000000000000000000000000000000000000000005",
      "topics": [
        "0xd3610b1c54575b7f4f0dc03d210b8ac55624ae007679b7a928a4f25a709331a8",
        "0x0000000000000000000000000000000000000000000000000000000000000005"
      ]
    },
    {
      "logIndex": "0x0",
      "removed": false,
      "blockNumber": "0x21c",
      "blockHash": "0xc7e6c9d5b9f522b2c9d2991546be0a8737e587beb6628c056f3c327a44b45132",
      "transactionHash": "0xfd1a40f9fbf89c97b4545ec9db774c85e51dd8a3545f969418a22f9cb79417c5",
      "transactionIndex": "0x0",
      "address": "0x42699a7612a82f1d9c36148af9c77354759b210b",
      "data": "0x0000000000000000000000000000000000000000000000000000000000000005",
      "topics": [
        "0xd3610b1c54575b7f4f0dc03d210b8ac55624ae007679b7a928a4f25a709331a8",
        "0x0000000000000000000000000000000000000000000000000000000000000005"
      ]
    }
  ]
}
```


You can use [`eth_getLogs`](#get-logs-using-a-filter-options-object) with a filter options
object to get all logs matching the filter options instead of using
[`eth_newFilter`](../../reference/api/index.md#eth_newfilter) followed by
[`eth_getFilterLogs`](../../reference/api/index.md#eth_getfilterlogs).
````

## Uninstall a filter

When a filter is no longer required, use [`eth_uninstallFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_uninstallfilter) to remove the filter.

## Filters for private contracts

Filters for private contracts are created, accessed, and uninstalled using:

* [`priv_getFilterChanges`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_getfilterchanges)
* [`priv_getFilterLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_getfilterlogs)
* [`priv_getLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_getlogs)
* [`priv_newFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_newfilter)
* [`priv_uninstallFilter`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_uninstallfilter).

## Get logs using a filter options object

To get all logs for a filter options object, use [`eth_getLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#eth_getlogs) or [`priv_getLogs`](https://github.com/ClishaChain/docs/blob/main/docs/besu/reference/api/index.md#priv_getlogs) for a private contract.

!!! example

````
The following request for `eth_getLogs` returns all the logs where the example contract has
been deployed to `0x42699a7612a82f1d9c36148af9c77354759b210b` and executed with `valueIndexed`
set to 5.

```json
{
  "jsonrpc":"2.0",
  "method":"eth_getLogs",
  "params":[
    {
      "fromBlock":"earliest",
      "toBlock":"latest",
      "address":"0x42699a7612a82f1d9c36148af9c77354759b210b",
      "topics":[
        ["0xd3610b1c54575b7f4f0dc03d210b8ac55624ae007679b7a928a4f25a709331a8"],
        ["0x0000000000000000000000000000000000000000000000000000000000000005"]
      ]
      }
  ],
  "id":1
}
```

The above example returns the same result as calling [eth_newFilter](#creating-a-filter)
followed by [eth_getFilterLogs](#getting-all-logs-for-a-filter).
````


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.clishachain.com/json-rpc-commands/access-logs.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.