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5c3eaf9983043db1b61a98c95d692a6958670b86 doc: Add warnings for http interfaces limitations (Fabian Jahr) Pull request description: `libevent`, which is used for our rest interface, can use up all of the available file descriptors in a system if too many connections are opened at once. If a new block is connected at the same time and can not be written to disk because there are no file descriptors available, the node crashes. Based on my investigation so far the issue is best solved upstream which means we have to wait for the next release (2.2). In the meantime it would be good if we would warn users of this limitation. See #11368 for more background. ACKs for top commit: MarcoFalke: ACK 5c3eaf9983043db1b61a98c95d692a6958670b86 Tree-SHA512: 73914538588477ead19068f5832fdcc8e0eb736e51f73b3aca501c93165e5ad634c2511a3fcffff251adcd3efda23a742b48211ad9d3b2a29cdeac17201d06a1
128 lines
5.0 KiB
Markdown
128 lines
5.0 KiB
Markdown
Unauthenticated REST Interface
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==============================
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The REST API can be enabled with the `-rest` option.
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The interface runs on the same port as the JSON-RPC interface, by default port 9998 for mainnet and port 19998 for testnet.
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REST Interface consistency guarantees
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-------------------------------------
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The [same guarantees as for the RPC Interface](/doc/JSON-RPC-interface.md#rpc-consistency-guarantees)
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apply.
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Limitations
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-----------
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There is a known issue in the REST interface that can cause a node to crash if
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too many http connections are being opened at the same time because the system runs
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out of available file descriptors. To prevent this from happening you might
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want to increase the number of maximum allowed file descriptors in your system
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and try to prevent opening too many connections to your rest interface at the
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same time if this is under your control. It is hard to give general advice
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since this depends on your system but if you make several hundred requests at
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once you are definitely at risk of encountering this issue.
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Supported API
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-------------
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#### Transactions
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`GET /rest/tx/<TX-HASH>.<bin|hex|json>`
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Given a transaction hash: returns a transaction in binary, hex-encoded binary, or JSON formats.
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For full TX query capability, one must enable the transaction index via "txindex=1" command line / configuration option.
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#### Blocks
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`GET /rest/block/<BLOCK-HASH>.<bin|hex|json>`
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`GET /rest/block/notxdetails/<BLOCK-HASH>.<bin|hex|json>`
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Given a block hash: returns a block, in binary, hex-encoded binary or JSON formats.
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Responds with 404 if the block doesn't exist.
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The HTTP request and response are both handled entirely in-memory.
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With the /notxdetails/ option JSON response will only contain the transaction hash instead of the complete transaction details. The option only affects the JSON response.
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#### Blockheaders
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`GET /rest/headers/<COUNT>/<BLOCK-HASH>.<bin|hex|json>`
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Given a block hash: returns <COUNT> amount of blockheaders in upward direction.
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Returns empty if the block doesn't exist or it isn't in the active chain.
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#### Blockhash by height
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`GET /rest/blockhashbyheight/<HEIGHT>.<bin|hex|json>`
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Given a height: returns hash of block in best-block-chain at height provided.
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#### Chaininfos
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`GET /rest/chaininfo.json`
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Returns various state info regarding block chain processing.
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Only supports JSON as output format.
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* chain : (string) current network name as defined in BIP70 (main, test, regtest)
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* blocks : (numeric) the current number of blocks processed in the server
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* headers : (numeric) the current number of headers we have validated
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* bestblockhash : (string) the hash of the currently best block
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* difficulty : (numeric) the current difficulty
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* mediantime : (numeric) the median time of the 11 blocks before the most recent block on the blockchain
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* verificationprogress : (numeric) estimate of verification progress [0..1]
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* chainwork : (string) total amount of work in active chain, in hexadecimal
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* pruned : (boolean) if the blocks are subject to pruning
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* pruneheight : (numeric) highest block available
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* softforks : (array) status of softforks in progress
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* bip9_softforks : (object) status of BIP9 softforks in progress
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#### Query UTXO set
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`GET /rest/getutxos/<checkmempool>/<txid>-<n>/<txid>-<n>/.../<txid>-<n>.<bin|hex|json>`
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The getutxo command allows querying of the UTXO set given a set of outpoints.
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See BIP64 for input and output serialisation:
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https://github.com/bitcoin/bips/blob/master/bip-0064.mediawiki
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Example:
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```
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$ curl localhost:19998/rest/getutxos/checkmempool/b2cdfd7b89def827ff8af7cd9bff7627ff72e5e8b0f71210f92ea7a4000c5d75-0.json 2>/dev/null | json_pp
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{
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"chainHeight" : 325347,
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"chaintipHash" : "00000000fb01a7f3745a717f8caebee056c484e6e0bfe4a9591c235bb70506fb",
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"bitmap": "1",
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"utxos" : [
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{
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"txvers" : 1
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"height" : 2147483647,
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"value" : 8.8687,
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"scriptPubKey" : {
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"asm" : "OP_DUP OP_HASH160 1c7cebb529b86a04c683dfa87be49de35bcf589e OP_EQUALVERIFY OP_CHECKSIG",
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"hex" : "76a9141c7cebb529b86a04c683dfa87be49de35bcf589e88ac",
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"reqSigs" : 1,
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"type" : "pubkeyhash",
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"addresses" : [
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"mi7as51dvLJsizWnTMurtRmrP8hG2m1XvD"
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]
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}
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}
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]
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}
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```
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#### Memory pool
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`GET /rest/mempool/info.json`
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Returns various information about the TX mempool.
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Only supports JSON as output format.
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* size : (numeric) the number of transactions in the TX mempool
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* bytes : (numeric) size of the TX mempool in bytes
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* usage : (numeric) total TX mempool memory usage
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* maxmempool : (numeric) maximum memory usage for the mempool in bytes
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* mempoolminfee : (numeric) minimum feerate (DASH per KB) for tx to be accepted
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`GET /rest/mempool/contents.json`
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Returns transactions in the TX mempool.
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Only supports JSON as output format.
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Risks
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-------------
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Running a web browser on the same node with a REST enabled dashd can be a risk. Accessing prepared XSS websites could read out tx/block data of your node by placing links like `<script src="http://127.0.0.1:19998/rest/tx/1234567890.json">` which might break the nodes privacy.
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