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1. Introduction
This document describes a protocol for interacting with Transmission
sessions remotely.
1.1 Terminology
The JSON terminology in RFC 4627 is used.
In benc terms, a JSON "array" is equivalent to a benc list,
a JSON "object" is equivalent to a benc dictionary,
and a JSON object's "keys" are the dictionary's string keys.
2. Message Format
Messages are formatted as objects. There are two types:
requests (described in 2.1) and responses (described in 2.2).
All text MUST be UTF-8 encoded.
2.1. Requests
Requests support three keys:
(1) A required "method" string telling the name of the method to invoke
(2) An optional "arguments" object of key/value pairs
(3) An optional "tag" number used by clients to track responses.
If provided by a request, the response MUST include the same tag.
2.2. Responses
Reponses support three keys:
(1) A required "result" string whose value MUST be "success" on success,
or an error string on failure.
(2) An optional "arguments" object of key/value pairs
(3) An optional "tag" number as described in 2.1.
2.3. Transport Mechanism
HTTP POSTing a JSON-encoded request is the preferred way of communicating
with a Transmission RPC server. The current Transmission implementation
has the default URL as http://host:9091/transmission/rpc. Clients
may use this as a default, but should allow the URL to be reconfigured,
since the port and path may be changed to allow mapping and/or multiple
daemons to run on a single server.
In addition to POSTing, there's also a simple notation for sending
requests in the query portion of a URL. This is not as robust, but can
be useful for debugging and simple tasks. The notation works as follows:
(1) Any key not "tag" or "method" is treated as an argument.
(2) The "arguments" key isn't needed, since data isn't nested.
(3) If the value in a key/value pair can be parsed as a number, then it is.
Otherwise if it can be parsed as an array of numbers, then it is.
Otherwise, it's parsed as a string.
Examples:
?method=torrent-start&ids=1,2
?method=session-set&speed-limit-down=50&speed-limit-down-enabled=1
3. Torrent Requests
3.1. Torrent Action Requests
Method name | libtransmission function
---------------------+-------------------------------------------------
"torrent-start" | tr_torrentStart
"torrent-stop" | tr_torrentStop
"torrent-verify" | tr_torrentVerify
"torrent-reannounce" | tr_torrentManualUpdate ("ask tracker for more peers")
Request arguments: "ids", which specifies which torrents to use.
All torrents are used if the "ids" argument is omitted.
"ids" should be one of the following:
(1) an integer referring to a torrent id
(2) a list of torrent id numbers, sha1 hash strings, or both
(3) a string, "recently-active", for recently-active torrents
Response arguments: none
3.2. Torrent Mutators
Method name: "torrent-set"
Request arguments:
string | value type & description
----------------------+-------------------------------------------------
"bandwidthPriority" | number this torrent's bandwidth tr_priority_t
"downloadLimit" | number maximum download speed (KBps)
"downloadLimited" | boolean true if "downloadLimit" is honored
"files-wanted" | array indices of file(s) to download
"files-unwanted" | array indices of file(s) to not download
"honorsSessionLimits" | boolean true if session upload limits are honored
"ids" | array torrent list, as described in 3.1
"location" | string new location of the torrent's content
"peer-limit" | number maximum number of peers
"priority-high" | array indices of high-priority file(s)
"priority-low" | array indices of low-priority file(s)
"priority-normal" | array indices of normal-priority file(s)
"seedIdleLimit" | number torrent-level number of minutes of seeding inactivity
"seedIdleMode" | number which seeding inactivity to use. See tr_inactvelimit
"seedRatioLimit" | double torrent-level seeding ratio
"seedRatioMode" | number which ratio to use. See tr_ratiolimit
"trackerAdd" | array strings of URLs to add
"trackerRemove" | array strings of URLs to remove
"trackerReplace" | array pairs of old/new announce URLs
"uploadLimit" | number maximum upload speed (KBps)
"uploadLimited" | boolean true if "uploadLimit" is honored
Just as an empty "ids" value is shorthand for "all ids", using an empty array
for "files-wanted", "files-unwanted", "priority-high", "priority-low", or
"priority-normal" is shorthand for saying "all files".
Response arguments: none
3.3. Torrent Accessors
Method name: "torrent-get".
Request arguments:
(1) An optional "ids" array as described in 3.1.
(2) A required "fields" array of keys. (see list below)
Response arguments:
(1) A "torrents" array of objects, each of which contains
the key/value pairs matching the request's "fields" argument.
(2) If the request's "ids" field was "recently-active",
a "removed" array of torrent-id numbers of recently-removed
torrents.
Note: For more information on what these fields mean, see the comments
in libtransmission/transmission.h. The "source" column here
corresponds to the data structure there.
key | type | source
----------------------------+-----------------------------+---------
activityDate | number | tr_stat
addedDate | number | tr_stat
bandwidthPriority | number | tr_priority_t
comment | string | tr_info
corruptEver | number | tr_stat
creator | string | tr_info
dateCreated | number | tr_info
desiredAvailable | number | tr_stat
doneDate | number | tr_stat
downloadDir | string | tr_torrent
downloadedEver | number | tr_stat
downloadLimit | number | tr_torrent
downloadLimited | boolean | tr_torrent
error | number | tr_stat
errorString | string | tr_stat
eta | number | tr_stat
files | array (see below) | n/a
fileStats | array (see below) | n/a
hashString | string | tr_info
haveUnchecked | number | tr_stat
haveValid | number | tr_stat
honorsSessionLimits | boolean | tr_torrent
id | number | tr_torrent
isFinished | boolean | tr_stat
isPrivate | boolean | tr_torrent
leftUntilDone | number | tr_stat
magnetLink | number | n/a
manualAnnounceTime | number | tr_stat
maxConnectedPeers | number | tr_torrent
metadataPercentComplete | double | tr_stat
name | string | tr_info
peer-limit | number | tr_torrent
peers | array (see below) | n/a
peersConnected | number | tr_stat
peersFrom | object (see below) | n/a
peersGettingFromUs | number | tr_stat
peersKnown | number | tr_stat
peersSendingToUs | number | tr_stat
percentDone | double | tr_stat
pieces | string (see below) | tr_torrent
pieceCount | number | tr_info
pieceSize | number | tr_info
priorities | array (see below) | n/a
rateDownload (KBps) | double | tr_stat
rateUpload (KBps) | double | tr_stat
recheckProgress | double | tr_stat
seedIdleLimit | number | tr_torrent
seedIdleMode | number | tr_inactvelimit
seedRatioLimit | double | tr_torrent
seedRatioMode | number | tr_ratiolimit
sizeWhenDone | number | tr_stat
startDate | number | tr_stat
status | number | tr_stat
trackers | array (see below) | n/a
trackerStats | array (see below) | n/a
totalSize | number | tr_info
torrentFile | string | tr_info
uploadedEver | number | tr_stat
uploadLimit | number | tr_torrent
uploadLimited | boolean | tr_torrent
uploadRatio | double | tr_stat
wanted | array (see below) | n/a
webseeds | array (see below) | n/a
webseedsSendingToUs | number | tr_stat
| |
| |
-------------------+--------+-----------------------------+
files | array of objects, each containing: |
+-------------------------+------------+
| key | type |
| bytesCompleted | number | tr_torrent
| length | number | tr_info
| name | string | tr_info
-------------------+--------------------------------------+
fileStats | a file's non-constant properties. |
| array of tr_info.filecount objects, |
| each containing: |
+-------------------------+------------+
| bytesCompleted | number | tr_torrent
| wanted | boolean | tr_info
| priority | number | tr_info
-------------------+--------------------------------------+
peers | array of objects, each containing: |
+-------------------------+------------+
| address | string | tr_peer_stat
| clientName | string | tr_peer_stat
| clientIsChoked | boolean | tr_peer_stat
| clientIsInterested | boolean | tr_peer_stat
| flagStr | string | tr_peer_stat
| isDownloadingFrom | boolean | tr_peer_stat
| isEncrypted | boolean | tr_peer_stat
| isIncoming | boolean | tr_peer_stat
| isUploadingTo | boolean | tr_peer_stat
| peerIsChoked | boolean | tr_peer_stat
| peerIsInterested | boolean | tr_peer_stat
| port | number | tr_peer_stat
| progress | double | tr_peer_stat
| rateToClient (KBps) | double | tr_peer_stat
| rateToPeer (KBps) | double | tr_peer_stat
-------------------+--------------------------------------+
peersFrom | an object containing: |
+-------------------------+------------+
| fromCache | number | tr_stat
| fromDht | number | tr_stat
| fromIncoming | number | tr_stat
| fromLtep | number | tr_stat
| fromPex | number | tr_stat
| fromTracker | number | tr_stat
-------------------+--------------------------------------+
pieces | A bitfield holding pieceCount flags | tr_torrent
| which are set to 'true' if we have |
| the piece matching that position. |
| JSON doesn't allow raw binary data, |
| so this is a base64-encoded string. |
-------------------+--------------------------------------+
priorities | an array of tr_info.filecount | tr_info
| numbers. each is the tr_priority_t |
| mode for the corresponding file. |
-------------------+--------------------------------------+
trackers | array of objects, each containing: |
+-------------------------+------------+
| announce | string | tr_tracker_info
| scrape | string | tr_tracker_info
| tier | number | tr_tracker_info
| id | number | tr_tracker_info
-------------------+--------------------------------------+
trackerStats | array of objects, each containing: |
+-------------------------+------------+
| announce | string | tr_tracker_stat
| announceState | number | tr_tracker_stat
| downloadCount | number | tr_tracker_stat
| hasAnnounced | boolean | tr_tracker_stat
| hasScraped | boolean | tr_tracker_stat
| host | string | tr_tracker_stat
| id | number | tr_tracker_stat
| isBackup | boolean | tr_tracker_stat
| lastAnnouncePeerCount | number | tr_tracker_stat
| lastAnnounceResult | number | tr_tracker_stat
| lastAnnounceStartTime | number | tr_tracker_stat
| lastAnnounceSucceeded | boolean | tr_tracker_stat
| lastAnnounceTime | number | tr_tracker_stat
| lastAnnounceTimedOut | boolean | tr_tracker_stat
| lastScrapeResult | string | tr_tracker_stat
| lastScrapeStartTime | number | tr_tracker_stat
| lastScrapeSucceeded | boolean | tr_tracker_stat
| lastScrapeTime | number | tr_tracker_stat
| lastScrapeTimedOut | boolean | tr_tracker_stat
| leecherCount | number | tr_tracker_stat
| nextAnnounceTime | number | tr_tracker_stat
| nextScrapeTime | number | tr_tracker_stat
| scrapeState | number | tr_tracker_stat
| seederCount | number | tr_tracker_stat
| tier | number | tr_tracker_stat
-------------------+-------------------------+------------+
wanted | an array of tr_info.fileCount | tr_info
| 'booleans' true if the corresponding |
| file is to be downloaded. |
-------------------+--------------------------------------+
webseeds | an array of strings: |
+-------------------------+------------+
| webseed | string | tr_info
+-------------------------+------------+
Example:
Say we want to get the name and total size of torrents #7 and #10.
Request:
{
"arguments": {
"fields": [ "id", "name", "totalSize" ],
"ids": [ 7, 10 ]
},
"method": "torrent-get",
"tag": 39693
}
Response:
{
"arguments": {
"torrents": [
{
"id": 10,
"name": "Fedora x86_64 DVD",
"totalSize": 34983493932,
},
{
"id": 7,
"name": "Ubuntu x86_64 DVD",
"totalSize", 9923890123,
}
]
},
"result": "success",
"tag": 39693
}
3.4. Adding a Torrent
Method name: "torrent-add"
Request arguments:
key | value type & description
---------------------+-------------------------------------------------
"download-dir" | string path to download the torrent to
"filename" | string filename or URL of the .torrent file
"metainfo" | string base64-encoded .torrent content
"paused" | boolean if true, don't start the torrent
"peer-limit" | number maximum number of peers
"bandwidthPriority" | number torrent's bandwidth tr_priority_t
"files-wanted" | array indices of file(s) to download
"files-unwanted" | array indices of file(s) to not download
"priority-high" | array indices of high-priority file(s)
"priority-low" | array indices of low-priority file(s)
"priority-normal" | array indices of normal-priority file(s)
Either "filename" OR "metainfo" MUST be included.
All other arguments are optional.
Response arguments: on success, a "torrent-added" object in the
form of one of 3.3's tr_info objects with the
fields for id, name, and hashString.
3.5. Removing a Torrent
Method name: "torrent-remove"
Request arguments:
string | value type & description
---------------------------+-------------------------------------------------
"ids" | array torrent list, as described in 3.1
"delete-local-data" | boolean delete local data. (default: false)
Response arguments: none
3.6. Moving a Torrent
Method name: "torrent-set-location"
Request arguments:
string | value type & description
---------------------------+-------------------------------------------------
"ids" | array torrent list, as described in 3.1
"location" | string the new torrent location
"move" | boolean if true, move from previous location.
| otherwise, search "location" for files
Response arguments: none
4. Session Requests
4.1. Session Arguments
string | value type & description
---------------------------------+-------------------------------------------------
"alt-speed-down" | number max global download speed (KBps)
"alt-speed-enabled" | boolean true means use the alt speeds
"alt-speed-time-begin" | number when to turn on alt speeds (units: minutes after midnight)
"alt-speed-time-enabled" | boolean true means the scheduled on/off times are used
"alt-speed-time-end" | number when to turn off alt speeds (units: same)
"alt-speed-time-day" | number what day(s) to turn on alt speeds (look at tr_sched_day)
"alt-speed-up" | number max global upload speed (KBps)
"blocklist-enabled" | boolean true means enabled
"blocklist-size" | number number of rules in the blocklist
"cache-size" | number maximum size of the disk cache (MB)
"config-dir" | string location of transmission's configuration directory
"download-dir" | string default path to download torrents
"dht-enabled" | boolean true means allow dht in public torrents
"encryption" | string "required", "preferred", "tolerated"
"inactive-seeding-limit" | number the default seed inactivity limit for torrents to use
"inactive-seeding-limit-enabled" | boolean true if the seeding inactivity limit is honored by default
"incomplete-dir" | string path for incomplete torrents, when enabled
"incomplete-dir-enabled" | boolean true means keep torrents in incomplete-dir until done
"lpd-enabled" | boolean true means allow Local Peer Discovery in public torrents
"peer-limit-global" | number maximum global number of peers
"peer-limit-per-torrent" | number maximum global number of peers
"pex-enabled" | boolean true means allow pex in public torrents
"peer-port" | number port number
"peer-port-random-on-start" | boolean true means pick a random peer port on launch
"port-forwarding-enabled" | boolean true means enabled
"rename-partial-files" | boolean true means append ".part" to incomplete files
"rpc-version" | number the current RPC API version
"rpc-version-minimum" | number the minimum RPC API version supported
"script-torrent-done-filename" | string filename of the script to run
"script-torrent-done-enabled" | boolean whether or not to call the "done" script
"seedRatioLimit" | double the default seed ratio for torrents to use
"seedRatioLimited" | boolean true if seedRatioLimit is honored by default
"speed-limit-down" | number max global download speed (KBps)
"speed-limit-down-enabled" | boolean true means enabled
"speed-limit-up" | number max global upload speed (KBps)
"speed-limit-up-enabled" | boolean true means enabled
"start-added-torrents" | boolean true means added torrents will be started right away
"trash-original-torrent-files" | boolean true means the .torrent file of added torrents will be deleted
"version" | string long version string "$version ($revision)"
"rpc-version" indicates the RPC interface version supported by the RPC server.
It is incremented when a new version of Transmission changes the RPC interface.
"rpc-version-minimum" indicates the oldest API supported by the RPC server.
It is changes when a new version of Transmission changes the RPC interface
in a way that is not backwards compatible. There are no plans for this
to be common behavior.
4.1.1. Mutators
Method name: "session-set"
Request arguments: one or more of 4.1's arguments, except: "blocklist-size",
"config-dir", "rpc-version", "rpc-version-minimum",
and "version"
Response arguments: none
4.1.2. Accessors
Method name: "session-get"
Request arguments: none
Response arguments: all of 4.1's arguments
4.2. Session Statistics
Method name: "session-stats"
Request arguments: none
Response arguments:
string | value type
---------------------------+-------------------------------------------------
"activeTorrentCount" | number
"downloadSpeed" | number
"pausedTorrentCount" | number
"torrentCount" | number
"uploadSpeed" | number
---------------------------+-------------------------------+
"cumulative-stats" | object, containing: |
+------------------+------------+
| uploadedBytes | number | tr_session_stats
| downloadedBytes | number | tr_session_stats
| filesAdded | number | tr_session_stats
| sessionCount | number | tr_session_stats
| secondsActive | number | tr_session_stats
---------------------------+-------------------------------+
"current-stats" | object, containing: |
+------------------+------------+
| uploadedBytes | number | tr_session_stats
| downloadedBytes | number | tr_session_stats
| filesAdded | number | tr_session_stats
| sessionCount | number | tr_session_stats
| secondsActive | number | tr_session_stats
4.3. Blocklist
Method name: "blocklist-update"
Request arguments: none
Response arguments: a number "blocklist-size"
4.4. Port Checking
This method tests to see if your incoming peer port is accessible
from the outside world.
Method name: "port-test"
Request arguments: none
Response arguments: a bool, "port-is-open"
5.0. Protocol Versions
The following changes have been made to the RPC interface:
RPC | Release | Backwards | |
Vers. | Version | Compat? | Method | Description
------+---------+-----------+----------------+-------------------------------
1 | 1.30 | n/a | n/a | Initial version
------+---------+-----------+----------------+-------------------------------
2 | 1.34 | yes | torrent-get | new arg "peers"
------+---------+-----------+----------------+-------------------------------
3 | 1.41 | yes | torrent-get | added "port" to "peers"
| | yes | torrent-get | new arg "downloaders"
| | yes | session-get | new arg "version"
| | yes | torrent-remove | new method
------+---------+-----------+----------------+-------------------------------
4 | 1.50 | yes | session-get | new arg "rpc-version"
| | yes | session-get | new arg "rpc-version-minimum"
| | yes | session-stats | added "cumulative-stats"
| | yes | session-stats | added "current-stats"
| | yes | torrent-get | new arg "downloadDir"
------+---------+-----------+----------------+-------------------------------
5 | 1.60 | yes | | new method "torrent-reannounce"
| | yes | | new method "blocklist-update"
| | yes | | new method "port-test"
| | | |
| | yes | session-get | new arg "alt-speed-begin"
| | yes | session-get | new arg "alt-speed-down"
| | yes | session-get | new arg "alt-speed-enabled"
| | yes | session-get | new arg "alt-speed-end"
| | yes | session-get | new arg "alt-speed-time-enabled"
| | yes | session-get | new arg "alt-speed-up"
| | yes | session-get | new arg "blocklist-enabled"
| | yes | session-get | new arg "blocklist-size"
| | yes | session-get | new arg "peer-limit-per-torrent"
| | yes | session-get | new arg "seedRatioLimit"
| | yes | session-get | new arg "seedRatioLimited"
| | NO | session-get | renamed "pex-allowed" to "pex-enabled"
| | NO | session-get | renamed "port" to "peer-port"
| | NO | session-get | renamed "peer-limit" to "peer-limit-global"
| | | |
| | yes | torrent-add | new arg "files-unwanted"
| | yes | torrent-add | new arg "files-wanted"
| | yes | torrent-add | new arg "priority-high"
| | yes | torrent-add | new arg "priority-low"
| | yes | torrent-add | new arg "priority-normal"
| | | |
| | yes | torrent-set | new arg "bandwidthPriority"
| | yes | torrent-set | new arg "honorsSessionLimits"
| | yes | torrent-set | new arg "seedRatioLimit"
| | yes | torrent-set | new arg "seedRatioLimited"
| | NO | torrent-set | renamed "speed-limit-down" to "downloadLimit"
| | NO | torrent-set | renamed "speed-limit-down-enabled" to "downloadLimited"
| | NO | torrent-set | renamed "speed-limit-up" to "uploadLimit"
| | NO | torrent-set | renamed "speed-limit-up-enabled" to "uploadLimited"
| | | |
| | yes | torrent-get | new arg "bandwidthPriority"
| | yes | torrent-get | new arg "fileStats"
| | yes | torrent-get | new arg "honorsSessionLimits"
| | yes | torrent-get | new arg "percentDone"
| | yes | torrent-get | new arg "pieces"
| | yes | torrent-get | new arg "seedRatioLimit"
| | yes | torrent-get | new arg "seedRatioMode"
| | yes | torrent-get | new arg "torrentFile"
| | yes | torrent-get | new ids option "recently-active"
| | NO | torrent-get | removed arg "downloadLimitMode"
| | NO | torrent-get | removed arg "uploadLimitMode"
------+---------+-----------+----------------+-------------------------------
6 | 1.70 | yes | | new "method torrent-set-location"
------+---------+-----------+----------------+-------------------------------
7 | 1.80 | NO | torrent-get | removed arg "announceResponse"
| | NO | torrent-get | removed arg "announceURL"
| | NO | torrent-get | removed arg "downloaders"
| | NO | torrent-get | removed arg "lastAnnounceTime"
| | NO | torrent-get | removed arg "lastScrapeTime"
| | NO | torrent-get | removed arg "leechers"
| | NO | torrent-get | removed arg "nextAnnounceTime"
| | NO | torrent-get | removed arg "nextScrapeTime"
| | NO | torrent-get | removed arg "scrapeResponse"
| | NO | torrent-get | removed arg "scrapeURL"
| | NO | torrent-get | removed arg "seeders"
| | NO | torrent-get | removed arg "timesCompleted"
| | NO | torrent-get | removed arg "swarmSpeed"
| | yes | torrent-get | new arg "magnetLink"
| | yes | torrent-get | new arg "metadataPercentComplete"
| | yes | torrent-get | new arg "trackerStats"
| | yes | session-set | new arg "incomplete-dir"
| | yes | session-set | new arg "incomplete-dir-enabled"
------+---------+-----------+----------------+-------------------------------
8 | 1.90 | yes | session-set | new arg "rename-partial-files"
| | yes | session-get | new arg "rename-partial-files"
| | yes | session-get | new arg "config-dir"
| | yes | torrent-add | new arg "bandwidthPriority"
| | yes | torrent-get | new trackerStats arg "lastAnnounceTimedOut"
------+---------+-----------+----------------+-------------------------------
8 | 1.92 | yes | torrent-get | new trackerStats arg "lastScrapeTimedOut"
------+---------+-----------+----------------+-------------------------------
9 | 2.00 | yes | session-set | new arg "start-added-torrents"
| | yes | session-set | new arg "trash-original-torrent-files"
| | yes | session-get | new arg "start-added-torrents"
| | yes | session-get | new arg "trash-original-torrent-files"
| | yes | torrent-get | new arg "isFinished"
------+---------+-----------+----------------+-------------------------------
10 | 2.10 | yes | session-get | new arg "cache-size"
| | yes | session-set | new arg "trash-original-torrent-files"
| | yes | session-get | new arg "trash-original-torrent-files"
| | yes | torrent-get | new arg "isFinished"
| | yes | torrent-set | new arg "trackerAdd"
| | yes | torrent-set | new arg "trackerEdit"
| | yes | torrent-set | new arg "trackerRemove"
| | yes | session-set | new arg "inactive-seeding-limit"
| | yes | session-set | new arg "inactive-seeding-limit-enabled"
| | yes | session-get | new arg "inactive-seeding-limit"
| | yes | session-get | new arg "inactive-seeding-limit-enabled"
| | yes | torrent-set | new arg "seedIdleLimit"
| | yes | torrent-set | new arg "seedIdleMode"
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