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crawl_shards: start drafting method ref
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mDuo13
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# crawl_shards
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[[Source]<br>](https://github.com/ripple/rippled/blob/master/src/ripple/rpc/handlers/CrawlShards.cpp "Source")
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Requests information from peer servers about which [shards of historical ledger data](history-sharding.html) they have available. [New in: rippled 1.2.0][]
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_The `crawl_shards` method is an [admin method](admin-rippled-methods.html) that cannot be run by unprivileged users._
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### Request Format
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An example of the request format:
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<!-- MULTICODE_BLOCK_START -->
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*WebSocket*
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```json
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{
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"command": "crawl_shards",
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"pubkey": true,
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"limit": 2
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}
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```
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*JSON-RPC*
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```json
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{
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"method": "crawl_shards",
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"params": [
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{
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"pubkey": true,
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"limit": 2
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}
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]
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}
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```
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<!-- MULTICODE_BLOCK_END -->
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The request includes the following fields:
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| `Field` | Type | Description |
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|:---------|:--------|:--------------------------------------------------------|
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| `pubkey` | Boolean | _(Optional)_ If `true`, the response includes the node public keys (for peer-to-peer communications) of servers that were crawled. The default is `false`. |
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| `limit` | Number | _(Optional)_ How many hops deep to search. The default is 0, which searches direct peers only. With a limit of `1`, searches peers' peers also. (The number of peers searched potentially grows exponentially as `limit` increases.) The maximum value is `3`. |
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### Response Format
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An example of a successful response:
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<!-- MULTICODE_BLOCK_START -->
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*WebSocket*
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```json
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{
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"result": {
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"complete_shards": "1-2,5,8-9,584,1973,2358",
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"peers": [
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{
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"complete_shards": "1-2,8,47,371,464,554,653,857,1076,1402,1555,1708,1813,1867",
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"public_key": "n9LxFZiySnfDSvfh23N94UxsFkCjWyrchTeKHcYE6tJJQL5iejb2"
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},
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{
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"complete_shards": "8-9,584",
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"ip": "192.168.1.132",
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"public_key": "n9MN5xwYqbrj64rtfZAXQy7Y3sNxXZJeLt7Lj61a9DYEZ4SE2tQQ"
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}
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]
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},
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"status": "success",
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"type": "response"
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}
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```
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*JSON-RPC*
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```json
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200 OK
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{
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"result": {
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"complete_shards": "1-2,5,8-9,584,1973,2358",
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"peers": [
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{
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"complete_shards": "1-2,8,47,371,464,554,653,857,1076,1402,1555,1708,1813,1867",
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"public_key": "n9LxFZiySnfDSvfh23N94UxsFkCjWyrchTeKHcYE6tJJQL5iejb2"
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},
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{
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"complete_shards": "8-9,584",
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"ip": "192.168.1.132",
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"public_key": "n9MN5xwYqbrj64rtfZAXQy7Y3sNxXZJeLt7Lj61a9DYEZ4SE2tQQ"
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}
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],
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"status": "success"
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}
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}
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```
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<!-- MULTICODE_BLOCK_END -->
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The response follows the [standard format][], with a successful result containing the following fields:
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| `Field` | Type | Description |
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|:------------------|:-------|:------------------------------------------------|
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| `complete_shards` | String | The range of history shards that are available across all servers that were searched. This may be disjointed. For example, `1-2,5,7-9` indicates that shards 1, 2, 5, 7, 8, and 9 are available. |
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| `peers` | Array | List of **Peer Shard Objects** (see below) describing which history shards each peer has available. Only includes servers that have [history sharding](history-sharding.html) enabled. |
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#### Peer Shard Objects
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Each member of the `peers` array of the response is an object that describes one server in the peer-to-peer network. These objects contain the following fields:
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| `Field` | Type | Description |
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|:----------|:-------|:--------------------------------------------------------|
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| `complete_shards` | String | The range of history shards this peer has available. This may be disjointed. For example, `1-2,5,7-9` indicates that shards 1, 2, 5, 7, 8, and 9 are available. |
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| `ip` | String | _(May be omitted)_ The IP address of the peer this object describes. This may be an IPv4 or IPv6 address. Omitted if the server is a private peer. |
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| `public_key` | String | _(Omitted unless the request specified `"pubkey": true`)_ The public key this peer uses for peer-to-peer communications, in the XRP Ledger's [base58 format](base58-encodings.html). |
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### Possible Errors
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- Any of the [universal error types][].
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- `invalidParams` - One or more required fields were omitted from the request, or a provided field was specified as the wrong data type.
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<!--{# common link defs #}-->
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{% include '_snippets/rippled-api-links.md' %}
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{% include '_snippets/tx-type-links.md' %}
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{% include '_snippets/rippled_versions.md' %}
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