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279 lines
11 KiB
279 lines
11 KiB
RPC Interface
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=============
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You can query the status of a running server, and affect its behaviour
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by sending **JSON RPC** commands to the LocalRPC port it is listening
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on. This is best done using the :file:`electrumx_rpc` script
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provided.
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The general form of invocation is::
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electrumx_rpc [-p PORT] <command> [arg1 [arg2...]]
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The port to send the commands to can be specified on the command line,
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otherwise the environment variable :envvar:`RPC_PORT` is used, and if
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that is not set then **8000** is assumed.
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The following commands are available:
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add_peer
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--------
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Add a peer to the peers list. ElectrumX will schdule an immediate
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connection attempt. This command takes a single argument: the peer's
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"real name" as it used to advertise itself on IRC::
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$ electrumx_rpc add_peer "ecdsa.net v1.0 s110 t"
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"peer 'ecdsa.net v1.0 s110 t' added"
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daemon_url
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----------
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This command takes an optional argument that is interpreted
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identically to the :envvar:`DAEMON_URL` environment variable. If
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omitted, the default argument value is the process's existing
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:envvar:`DAEMON_URL` environment variable.
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This command replaces the daemon's URL at run-time, and also
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forecefully rotates to the first URL in the list.
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For example, in case ElectrumX has previously failed over to a
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secondary daemon and you want to revert to the primary having resolved
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the connectivity issue, invoking this command without an argument will
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have that effect.
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disconnect
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----------
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Disonnect the given session IDs or group names.
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Session IDs can be obtained in the logs or with the `sessions`_ RPC command. Group
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names can be optained with the `groups`_ RPC command.
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The special string :const:`all` disconnects all sessions.
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Example::
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$ electrumx_rpc disconnect 209.59.102 34 2
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[
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"disconnecting session 34",
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"disconnecting group 209.59.102"
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"unknown: 2",
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]
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getinfo
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-------
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Return a summary of server state. This command takes no arguments.
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A typical result is as follows (with annotated comments)::
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$ electrumx_rpc getinfo
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{
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"coin": "BitcoinSegwit",
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"daemon": "127.0.0.1:9334/",
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"daemon height": 572154, # The daemon's height when last queried
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"db height": 572154, # The height to which the DB is flushed
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"groups": 586, # The number of session groups
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"history cache": "185,014 lookups 9,756 hits 1,000 entries",
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"merkle cache": "280 lookups 54 hits 213 entries",
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"peers": { # Peer information
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"bad": 1,
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"good": 51,
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"never": 2,
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"stale": 0,
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"total": 54
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},
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"pid": 11804, # Process ID
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"request counts": { # Count of RPC requests by method name
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"blockchain.block.header": 245,
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"blockchain.block.headers": 70,
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"blockchain.estimatefee": 12776,
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"blockchain.headers.subscribe": 2825,
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"blockchain.relayfee": 740,
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"blockchain.scripthash.get_history": 196,
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"blockchain.scripthash.subscribe": 184626,
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"blockchain.transaction.broadcast": 19,
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"blockchain.transaction.get": 213,
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"blockchain.transaction.get_merkle": 289,
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"getinfo": 3,
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"groups": 1,
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"mempool.get_fee_histogram": 3194,
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"server.add_peer": 9,
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"server.banner": 740,
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"server.donation_address": 754,
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"server.features": 50,
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"server.peers.subscribe": 792,
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"server.ping": 6412,
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"server.version": 2866
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},
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"request total": 216820, # Total requests served
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"sessions": { # Live session stats
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"count": 670,
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"count with subs": 45,
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"errors": 0,
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"logged": 0,
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"paused": 0,
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"pending requests": 79, # Number of requests currently being processed
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"subs": 36292 # Total subscriptions
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},
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"tx hashes cache": "289 lookups 38 hits 213 entries",
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"txs sent": 19, # Transactions broadcast
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"uptime": "01h 39m 04s",
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"version": "ElectrumX 1.10.1"
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}
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Each ill-formed request, or one that does not follow the Electrum
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protocol, increments the error count of the session that sent it.
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:ref:`logging <session logging>` of sessions can be enabled by RPC.
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For more information on peers see :ref:`here <peers>`.
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Clients that are slow to consume data sent to them are :dfn:`paused` until their socket
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buffer drains sufficiently, at which point processing of requests resumes.
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Apart from very short intervals, typically after a new block or when a client has just
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connected, the number of unprocessed requests should be low, say 250 or fewer. If it is
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over 1,000 the server is overloaded.
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Sessions are put into groups, primarily as an anti-DoS measure. Currently each session
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goes into two groups: one for an IP subnet, and one based on the timeslice it connected
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in. Each member of a group incurs a fraction of the costs of the other group members.
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This appears in the `sessions_` list under the column XCost.
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groups
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------
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Return a list of all current session groups. Takes no arguments.
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The output is quite similar to the `sessions`_ command.
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log
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---
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Toggle logging of the given session IDs or group names. All incoming requests for a
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logged session are written to the server log. The arguments are case-insensitive.
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When a group is specified, logging is toggled for its current members only; there is no
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effect on future group members.
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Session IDs can be obtained in the logs or with the `sessions`_ RPC command. Group
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names can be optained with the `groups`_ RPC command.
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The special string :const:`all` turns on logging of all current and future sessions,
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:const:`none` turns off logging of all current and future sessions, and :const:`new`
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toggles logging of future sessions.
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Example::
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$ electrumx_rpc log new 6 t0 z
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[
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"logging new sessions",
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"logging session 6",
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"logging session 3",
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"logging session 57",
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"logging session 12"
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"unknown: z",
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]
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In the above command sessions 3, 12 and 57 were in group `t0` (in fact, session 6 was
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too).
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.. _peers:
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peers
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-----
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Return a list of peer Electrum servers serving the same coin network.
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This command takes no arguments.
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Peer data is obtained via a peer discovery protocol documented
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:ref:`here <Peer Discovery>`::
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$ electrumx_rpc peers
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Host Status TCP SSL Server Min Max Pruning Last Good Last Try Tries Source IP Address
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bch.tedy.pw good 50001 50002 ElectrumX 1.2.1 0.9 1.2 07h 29m 23s 07h 30m 40s 0 peer 185.215.224.26
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shsmithgoggryfbx.onion good 60001 60002 ElectrumX 1.2.1 0.9 1.2 07h 30m 34s 07h 30m 38s 0 peer
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bccarihace4jdcnt.onion good 52001 52002 ElectrumX 1.2.1 0.9 1.2 07h 30m 34s 07h 30m 39s 0 peer
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[...]
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electroncash.checksum0.com good 50001 50002 ElectrumX 1.2.1 0.9 1.1 07h 30m 40s 07h 30m 41s 0 peer 149.56.198.233
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.. _query:
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query
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-----
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Run a query of the UTXO and history databases against one or more
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addresses, hex scripts or ASCII names (for coins that have an index
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on names like Namecoin). `--limit <N>` or `-l <N>` limits the output
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for each kind to that many entries. History is printed in blockchain
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order; UTXOs in an arbitrary order.
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For example::
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$ electrumx_rpc query --limit 5 76a91462e907b15cbf27d5425399ebf6f0fb50ebb88f1888ac
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Script: 76a91462e907b15cbf27d5425399ebf6f0fb50ebb88f1888ac
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History #1: height 123,723 tx_hash 3387418aaddb4927209c5032f515aa442a6587d6e54677f08a03b8fa7789e688
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History #2: height 127,280 tx_hash 4574958d135e66a53abf9c61950aba340e9e140be50efeea9456aa9f92bf40b5
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History #3: height 127,909 tx_hash 8b960c87f9f1a6e6910e214fcf5f9c69b60319ba58a39c61f299548412f5a1c6
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History #4: height 127,943 tx_hash 8f6b63012753005236b1b76e4884e4dee7415e05ab96604d353001662cde6b53
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History #5: height 127,943 tx_hash 60ff2dfdf67917040139903a0141f7525a7d152365b371b35fd1cf83f1d7f704
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UTXO #1: tx_hash 9aa497bf000b20f5ec5dc512bb6c1b60b68fc584d38b292b434e839ea8807bf0 tx_pos 0 height 254,148 value 5,500
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UTXO #2: tx_hash 1c998142a5a5aae6f8c1eab245351413fe8d4032a3f14345f9943a0d0bc90ec0 tx_pos 0 height 254,161 value 5,500
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UTXO #3: tx_hash 53345491b4829140be53f30079c6e4556a18545343b122900ebbfa158f9ca97a tx_pos 0 height 254,163 value 5,500
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UTXO #4: tx_hash c71ad947ac46af217da3cd5521113cbd03e36ddada2b4452afe6c15f944d2529 tx_pos 0 height 372,916 value 1,000
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UTXO #5: tx_hash c944a6acac054275a5e294e746d9ce79f6dcae91f3b4f5a84561aee6404a55b3 tx_pos 0 height 254,148 value 5,500
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Balance: 17.8983303 BCH
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reorg
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-----
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Force a block chain reorganisation, primarily for debugging purposes.
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This command takes an optional argument - the number of blocks to
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reorg - which defaults to 3.
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That number of blocks will be backed up - using undo information
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stored in ElectrumX's database - and then ElectrumX will move forwards
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on the daemon's main chain to its current height.
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.. _sessions:
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sessions
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--------
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Return a list of all current sessions. Takes no arguments::
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ID Flags Client Proto Cost XCost Reqs Txs Subs Recv Recv KB Sent Sent KB Time Peer
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1 S6 1.1.1 1.4 0 16 0 0 0 3 0 3 0 05m42s 165.255.191.213:22349
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2 S6 all_seeing_eye 1.4 0 16 0 0 0 2 0 2 0 05m40s 67.170.52.226:24995
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4 S6 3.3.2 1.4 0 16 0 0 34 45 5 45 3 05m40s 185.220.100.252:40463
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3 S6 1.1.2 1.4 0 16 0 0 0 3 0 3 0 05m40s 89.17.142.28:59241
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The columns show information by session: the session ID, flags (see below), how the client
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identifies itself - typically the Electrum client version, the protocol version
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negotiated, the session cost, the additional session cost accrued from its groups, the
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number of unprocessed requests, the number of transactions sent, the number of address
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subscriptions, the number of requests received and their total size, the number of
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messages sent and their size, how long the client has been connected, and the client's IP
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address (if anonymous logging is disabled).
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The flags are:
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* ``S`` an SSL connection
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* ``T`` a TCP connection
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* ``R`` a local RPC connection
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* ``L`` a logged session
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* ``C`` a connection that is being closed
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* the non-negative number is the connection "cost", with lower
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numbers having higher priority. RPC connections have cost ``0``,
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normal connections have cost at least ``1``.
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stop
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----
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Flush all cached data to disk and shut down the server cleanly, as if
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sending the `KILL` signal. Be patient - during initial sync flushing
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all cached data to disk can take several minutes. This command takes
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no arguments.
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.. _session logging:
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