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-rw-r--r--doc/build-unix.md11
-rw-r--r--doc/release-notes.md10
-rw-r--r--doc/zmq.md53
3 files changed, 45 insertions, 29 deletions
diff --git a/doc/build-unix.md b/doc/build-unix.md
index e02a5e42f7..39f75e6b8d 100644
--- a/doc/build-unix.md
+++ b/doc/build-unix.md
@@ -1,6 +1,6 @@
UNIX BUILD NOTES
====================
-Some notes on how to build Bitcoin in Unix.
+Some notes on how to build Bitcoin in Unix.
Note
---------------------
@@ -44,6 +44,7 @@ Optional dependencies:
qt | GUI | GUI toolkit (only needed when GUI enabled)
protobuf | Payments in GUI | Data interchange format used for payment protocol (only needed when GUI enabled)
libqrencode | QR codes in GUI | Optional for generating QR codes (only needed when GUI enabled)
+ libzmq3 | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.x)
For the versions used in the release, see [release-process.md](release-process.md) under *Fetch and build inputs*.
@@ -59,7 +60,7 @@ Dependency Build Instructions: Ubuntu & Debian
Build requirements:
sudo apt-get install build-essential libtool autotools-dev autoconf pkg-config libssl-dev libevent-dev
-
+
For Ubuntu 12.04 and later or Debian 7 and later libboost-all-dev has to be installed:
sudo apt-get install libboost-all-dev
@@ -81,6 +82,11 @@ Optional:
sudo apt-get install libminiupnpc-dev (see --with-miniupnpc and --enable-upnp-default)
+ZMQ dependencies:
+
+ sudo apt-get install libzmq3-dev (provides ZMQ API 4.x)
+
+
Dependencies for the GUI: Ubuntu & Debian
-----------------------------------------
@@ -229,4 +235,3 @@ In this case there is no dependency on Berkeley DB 4.8.
Mining is also possible in disable-wallet mode, but only using the `getblocktemplate` RPC
call not `getwork`.
-
diff --git a/doc/release-notes.md b/doc/release-notes.md
index 85cdabc7e3..70623a3939 100644
--- a/doc/release-notes.md
+++ b/doc/release-notes.md
@@ -46,7 +46,7 @@ caching. A sample config for apache2 could look like:
# optional enable digest auth
# AuthType Digest
# ...
-
+
# optional bypass bitcoind rpc basic auth
# RequestHeader set Authorization "Basic <hash>"
# get the <hash> from the shell with: base64 <<< bitcoinrpc:<password>
@@ -171,3 +171,11 @@ configured specifically to process scriptPubKey and not scriptSig scripts.
- Removed bitrpc.py from contrib
+Addition of ZMQ-based Notifcations
+==================================
+
+Bitcoind can now (optionally) asynchronously notify clients through a
+ZMQ-based PUB socket of the arrival of new transactions and blocks.
+This feature requires installation of the ZMQ C API library 4.x and
+configuring its use through the command line or configuration file.
+Please see docs/zmq.md for details of operation.
diff --git a/doc/zmq.md b/doc/zmq.md
index fd04f6d9f0..358d29d046 100644
--- a/doc/zmq.md
+++ b/doc/zmq.md
@@ -1,7 +1,7 @@
# Block and Transaction Broadcasting With ZeroMQ
[ZeroMQ](http://zeromq.org/) is a lightweight wrapper around TCP
-connections, inter-process communications, and shared-memory,
+connections, inter-process communication, and shared-memory,
providing various message-oriented semantics such as publish/subcribe,
request/reply, and push/pull.
@@ -14,17 +14,18 @@ requesting blockchain related data. However, there exists only a
limited service to notify external software of events like the arrival
of new blocks or transactions.
-The ZeroMQ facility implements a notification interface through a
-set of specific notifiers. Currently there are notifiers that publish
+The ZeroMQ facility implements a notification interface through a set
+of specific notifiers. Currently there are notifiers that publish
blocks and transactions. This read-only facility requires only the
-connection of a corresponding ZeroMQ subscriber port in receiving
+connection of a corresponding ZeroMQ subscriber port in receiving
software; it is not authenticated nor is there any two-way protocol
involvement. Therefore, subscribers should validate the received data
since it may be out of date, incomplete or even invalid.
-ZeroMQ sockets are self-connecting and self-healing; that is, connects
-made between two endpoints will be automatically restored after an
-outage, and either end may be freely started or stopped in any order.
+ZeroMQ sockets are self-connecting and self-healing; that is,
+connections made between two endpoints will be automatically restored
+after an outage, and either end may be freely started or stopped in
+any order.
Because ZeroMQ is message oriented, subscribers receive transactions
and blocks all-at-once and do not need to implement any sort of
@@ -32,13 +33,13 @@ buffering or reassembly.
## Prerequisites
-The ZeroMQ feature in Bitcoin Core uses only a very small part of the
-ZeroMQ C API, and is thus compatible with any version of ZeroMQ
-from 2.1 onward, including all versions in the 3.x and 4.x release
-series. Typically, it is packaged by distributions as something like
-*libzmq-dev*.
+The ZeroMQ feature in Bitcoin Core requires ZeroMQ API version 4.x or
+newer. Typically, it is packaged by distributions as something like
+*libzmq3-dev*. The C++ wrapper for ZeroMQ is *not* needed.
-The C++ wrapper for ZeroMQ is *not* needed.
+In order to run the example Python client scripts in contrib/ one must
+also install *python-zmq*, though this is not necessary for daemon
+operation.
## Enabling
@@ -60,17 +61,19 @@ Currently, the following notifications are supported:
-zmqpubrawblock=address
-zmqpubrawtx=address
-The socket type is PUB and the address must be a valid ZeroMQ
-socket address. The same address can be used in more than one notification.
+The socket type is PUB and the address must be a valid ZeroMQ socket
+address. The same address can be used in more than one notification.
For instance:
- $ bitcoind -zmqpubhashtx=tcp://127.0.0.1:28332 -zmqpubrawtx=ipc:///tmp/bitcoind.tx.raw
+ $ bitcoind -zmqpubhashtx=tcp://127.0.0.1:28332 \
+ -zmqpubrawtx=ipc:///tmp/bitcoind.tx.raw
Each PUB notification has a topic and body, where the header
-corresponds to the notification type. For instance, for the notification
-`-zmqpubhashtx` the topic is `hashtx` (no null terminator) and the body is the
-hexadecimal transaction hash (32 bytes).
+corresponds to the notification type. For instance, for the
+notification `-zmqpubhashtx` the topic is `hashtx` (no null
+terminator) and the body is the hexadecimal transaction hash (32
+bytes).
These options can also be provided in bitcoin.conf.
@@ -78,9 +81,9 @@ ZeroMQ endpoint specifiers for TCP (and others) are documented in the
[ZeroMQ API](http://api.zeromq.org).
Client side, then, the ZeroMQ subscriber socket must have the
-ZMQ_SUBSCRIBE option set to one or either of these prefixes (for instance, just `hash`); without
-doing so will result in no messages arriving. Please see `contrib/zmq/zmq_sub.py`
-for a working example.
+ZMQ_SUBSCRIBE option set to one or either of these prefixes (for
+instance, just `hash`); without doing so will result in no messages
+arriving. Please see `contrib/zmq/zmq_sub.py` for a working example.
## Remarks
@@ -93,6 +96,6 @@ No authentication or authorization is done on connecting clients; it
is assumed that the ZeroMQ port is exposed only to trusted entities,
using other means such as firewalling.
-Note that when the block chain tip changes, a reorganisation may occur and just
-the tip will be notified. It is up to the subscriber to retrieve the chain
-from the last known block to the new tip.
+Note that when the block chain tip changes, a reorganisation may occur
+and just the tip will be notified. It is up to the subscriber to
+retrieve the chain from the last known block to the new tip.