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If this is what you want to do, use the GNU Lesser General +Public License instead of this License. diff --git a/mod_libcluster/README.md b/mod_libcluster/README.md new file mode 100644 index 00000000..e6e9ea26 --- /dev/null +++ b/mod_libcluster/README.md @@ -0,0 +1,49 @@ +mod_libcluster - Join nodes into cluster +======================================== + +Requires: +- ejabberd 24.xx or higher compiled with Elixir support + + +This small module connects this ejabberd node to other nodes +using [libcluster](https://github.com/bitwalker/libcluster). + +Options +------- + +This module supports several configurable options. +There are some example configuration files in the `test/` directory. +Options supported by this module: + +* `strategy` + + Sets the clustering strategy to use. + + Supported values are: + - `local_epmd`: connect to all nodes managed by the local epmd program + - `epmd`: connect to the nodes you specify in the `config: hosts` option + - `kubernetes` + + Default value: `local_epmd`. + +* `hosts` + + List of erlang node names to connect. + This is required, and only useful, when using the `epmd` strategy. + Default value: `[]`. + +* `timeut` + + Timeout to connect to a node, expressed in milliseconds. + This is only useful when using the `epmd` strategy. + Default value: `infinity`. + +For details of options supported please check the +[libcluster documentation](https://hexdocs.pm/libcluster). + +Test +---- + +There's a test script in `test/test.sh` that you can run. +It compiles ejabberd, installs in `/tmp/` several nodes, +and builds a cluster using the desired strategy. diff --git a/mod_libcluster/conf/mod_libcluster.yml b/mod_libcluster/conf/mod_libcluster.yml new file mode 100644 index 00000000..c02e9492 --- /dev/null +++ b/mod_libcluster/conf/mod_libcluster.yml @@ -0,0 +1,24 @@ +#modules: +# 'ModLibcluster': + + # Connect with any other local node + #strategy: local_epmd + + # Connect only to those specific nodes + #strategy: epmd + #config: + # hosts: + # - ejabberd1@127.0.0.1 + # - ejabberd2@127.0.0.1 + # - ejabberd3@127.0.0.1 + + #strategy: kubernetes + #config: + # mode: hostname + # kubernetes_ip_lookup_mode: pods + # kubernetes_namespace: "ejabberd" + # kubernetes_selector: "app=ejabberd" + # kubernetes_node_basename: "ejabberd" + # kubernetes_service_name: "ejabberd-headless" + # polling_interval: 10000 + diff --git a/mod_libcluster/lib/mod_libcluster.ex b/mod_libcluster/lib/mod_libcluster.ex new file mode 100644 index 00000000..e5a4d764 --- /dev/null +++ b/mod_libcluster/lib/mod_libcluster.ex @@ -0,0 +1,73 @@ +defmodule ModLibcluster do + use Ejabberd.Module + + def start(_host, opts) do + + strategy = case opts[:strategy] do + :local_epmd -> + :"Elixir.Cluster.Strategy.LocalEpmd" + :epmd -> + :"Elixir.Cluster.Strategy.Epmd" + :kubernetes -> + :"Elixir.Cluster.Strategy.Kubernetes" + other_strategy -> + other_strategy + end + info("Starting ejabberd module Libcluster with stategy #{inspect(strategy)}") + + config = [ + hosts: opts[:hosts], + timeout: opts[:timeout] + ] + info("Starting ejabberd module Libcluster with config #{inspect(config)}") + + topologies = [ + ejabberd_cluster: [ + strategy: strategy, + config: config, + connect: {:ejabberd_admin, :join_cluster, []}, + disconnect: {:ejabberd_admin, :leave_cluster, []} + ] + ] + children = [ + {Cluster.Supervisor, [topologies, [name: Ejabberd.ClusterSupervisor]]}, + ] + Supervisor.start_link(children, strategy: :one_for_one, name: Ejabberd.Supervisor) + info("Started ejabberd module Libcluster Demo") + :ok + end + + def stop(_host) do + info("Stopping ejabberd module Libcluster Demo") + :ok + end + + def depends(_host, _opts) do + [] + end + + def mod_opt_type(:hosts) do + :econf.list(:econf.atom) + end + + def mod_opt_type(:strategy) do + :econf.atom + end + + def mod_opt_type(:timeout) do + :econf.either(:infinity, :econf.int()); + end + + def mod_options(_host) do + [ + {:hosts, []}, + {:strategy, :local_epmd}, + {:timeout, :infinity} + ] + end + + def mod_doc() do + %{:desc => "This is just an empty string."} + end + +end diff --git a/mod_libcluster/mod_libcluster.spec b/mod_libcluster/mod_libcluster.spec new file mode 100644 index 00000000..6ae0a6df --- /dev/null +++ b/mod_libcluster/mod_libcluster.spec @@ -0,0 +1,5 @@ +author: "Badlop " +category: "cluster" +summary: "Join nodes into cluster" +home: "https://github.com/processone/ejabberd-contrib/tree/master/" +url: "git@github.com:processone/ejabberd-contrib.git" diff --git a/mod_libcluster/rebar.config b/mod_libcluster/rebar.config new file mode 100644 index 00000000..2510f0fc --- /dev/null +++ b/mod_libcluster/rebar.config @@ -0,0 +1,4 @@ +{deps, [ + {jason, "1.5.0-alpha.2", {git, "https://github.com/michalmuskala/jason", {branch, "master"}}}, + {libcluster, "3.3.3", {git, "https://github.com/bitwalker/libcluster", {branch, "main"}}} + ]}. diff --git a/mod_libcluster/test/epmd.yml b/mod_libcluster/test/epmd.yml new file mode 100644 index 00000000..532faf96 --- /dev/null +++ b/mod_libcluster/test/epmd.yml @@ -0,0 +1,9 @@ +modules: + 'ModLibcluster': + # Connect only to those specific nodes + strategy: epmd + timeout: 5000 + hosts: + - ejabberd1@127.0.0.1 + - ejabberd2@127.0.0.1 + - ejabberd3@127.0.0.1 diff --git a/mod_libcluster/test/local_epmd.yml b/mod_libcluster/test/local_epmd.yml new file mode 100644 index 00000000..b713dd4e --- /dev/null +++ b/mod_libcluster/test/local_epmd.yml @@ -0,0 +1,4 @@ +modules: + 'ModLibcluster': + # Connect with any other local node + strategy: local_epmd diff --git a/mod_libcluster/test/test.sh b/mod_libcluster/test/test.sh new file mode 100755 index 00000000..680921ee --- /dev/null +++ b/mod_libcluster/test/test.sh @@ -0,0 +1,163 @@ +#!/bin/bash + +COLOUR="\e[1;49;33m" +NEUTRAL="\033[00m" + +log() { + echo "" + echo -e $COLOUR"==> $1"$NEUTRAL +} + +MOD=$(pwd) + +TOOL=$1 +STR=$2 +SRC=$3 +if [ -n "$TOOL" ] && [ -n "$STR" ] && [ -n "$SRC" ] ; then + log "Using tool: $TOOL" + log "Using strategy: $STR" + log "Using ejabberd source code from: $SRC" +else + echo "Usage: $0 " + echo " = mix | rebar3" + echo " = local_epmd | epmd" + echo " = path to the ejabberd source code" + echo "For example: $0 mix local_epmd /home/user1/git/ejabberd/" + exit 1 +fi + +cd "$SRC" || exit 1 + +log "Compile ejabberd release..." + +compile() { + ./autogen.sh + ./configure \ + --with-rebar=$TOOL \ + --enable-all + make + rm _build/prod/*.tar.gz + make rel +} + +compile + +log "Preparing ejabberd nodes..." + +case "$TOOL" in + mix) + echo "Setting up 'mix' tool..." + FILE=$(ls -1 _build/prod/*.tar.gz) + ;; + rebar3) + echo "Setting up 'rebar3' tool..." + FILE=$(ls -1 _build/prod/rel/ejabberd/*.tar.gz) + ;; +esac + +create_node() { + N=$1 + log "Preparing node $N using file $FILE..." + rm -rf /tmp/libcluster/"$N" + mkdir -p /tmp/libcluster/"$N" + tar -xzf "$FILE" -C /tmp/libcluster/"$N" + sed -i "s|#' POLL|EJABBERD_BYPASS_WARNINGS=true\n\n#' POLL|g" /tmp/libcluster/"$N"/conf/ejabberdctl.cfg + sed -i "s|#ERLANG_NODE=.*|ERLANG_NODE=ejabberd$N@127.0.0.1|" /tmp/libcluster/"$N"/conf/ejabberdctl.cfg + sed -i "s| port: \([0-9]*\)| port: \1$N|g" /tmp/libcluster/"$N"/conf/ejabberd.yml + sed -i "s|mod_proxy65:|mod_proxy65:\n port: 777$N|" /tmp/libcluster/"$N"/conf/ejabberd.yml + node[N]=/tmp/libcluster/"$N"/bin/ejabberdctl +} + +create_node 1 +create_node 2 +create_node 3 + +FIRST=${node[1]} +SECOND=${node[2]} +THIRD=${node[3]} + +log "Let's start the first node..." + +echo "first: $FIRST" +$FIRST start +$FIRST started +$FIRST set_master self + +log "Uninstall and install mod_libcluster:" + +$FIRST module_uninstall mod_libcluster +rm -rf $MOD/deps/ +rm -rf $MOD/ebin/ +$FIRST module_install mod_libcluster || exit 1 + +log "Configure mod_libcluster:" + +case "$STR" in + local_epmd) + echo "Setting up 'local_epmd' config..." + cp "$MOD"/test/local_epmd.yml \ + "$HOME"/.ejabberd-modules/mod_libcluster/conf/mod_libcluster.yml + ;; + epmd) + echo "Setting up 'epmd' config..." + cp "$MOD"/test/epmd.yml \ + "$HOME"/.ejabberd-modules/mod_libcluster/conf/mod_libcluster.yml + ;; +esac + +log "Initial cluster of first node (should be just this node):" + +$FIRST list_cluster + +log "Let's start the second node, it should connect automatically to the first node..." + +$SECOND start +$SECOND started +sleep 5 # wait a few seconds to let the second node join the cluster properly +$SECOND set_master ejabberd1@127.0.0.1 + +log "Let's start the third node, it should connect automatically to the first node..." + +$THIRD start +$THIRD started +sleep 5 # wait a few seconds to let the second node join the cluster properly + +log "Cluster as seen by first node:" + +$FIRST list_cluster + +log "Cluster as seen by second node:" + +$SECOND list_cluster + +log "Cluster as seen by third node:" + +$THIRD list_cluster + +log "Stop first node, and check cluster as seen by second node:" + +$FIRST stop +$FIRST stopped +$SECOND list_cluster + +log "... as seen by third node:" + +$THIRD list_cluster + +log "Start again first node, and check cluster as seen by all the nodes:" + +$FIRST start +$FIRST started +sleep 5 +echo "First: " +$FIRST list_cluster +echo "Second: " +$SECOND list_cluster +echo "Third: " +$THIRD list_cluster + +log "Stopping all nodes..." + +$FIRST stop +$SECOND stop +$THIRD stop