New bashlet client/etcd.

Rudimentary interaction with #coreos #etcd.

lib/client/etcd

@@ -0,0 +1,96 @@
+#!/bin/bash
+
+
+################################################################################
+#                                         
+# |              |    |         |         
+# |---.,---.,---.|---.|    ,---.|--- ,---.
+# |   |,---|`---.|   ||    |---'|    `---.
+# `---'`---^`---'`   '`---'`---'`---'`---'
+#
+#                                        
+# Bashlets -- A modular extensible toolbox for Bash
+#
+# Copyright (c) 2014-6 Roberto Reale
+# 
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+# 
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+# 
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+################################################################################
+
+
+BASHLETS_CLIENT_ETCD_HOST=localhost
+BASHLETS_CLIENT_ETCD_PORT=2379
+
+
+function __bashlets_client_etcd_get_version()
+{
+    local system="$1" json val
+
+    # inspired by code at https://gist.github.com/mway/9841302/
+	# TODO: remove dependency on curl and Python
+
+    json="$(curl -sL "http://$BASHLETS_CLIENT_ETCD_HOST:$BASHLETS_CLIENT_ETCD_PORT/version")"
+    [ -n "$json" ] && val="$(python -c "import json; o=json.loads('$json'); print(o['$system'] if o.get('errorCode') is None else '')")"
+    [ -n "$val" ] && echo $val
+}
+
+
+#@method
+function bashlets_client_etcd_get_server_version()
+{
+    __bashlets_client_etcd_get_version etcdserver
+}
+
+#@method
+function bashlets_client_etcd_get_cluster_version()
+{
+    __bashlets_client_etcd_get_version etcdcluster
+}
+
+#@method
+function bashlets_client_etcd_get()
+{
+    # inspired by code at https://gist.github.com/mway/9841302/
+	# TODO: remove dependency on curl and Python
+
+    local key="$1" json val
+
+    json="$(curl -sL "http://$BASHLETS_CLIENT_ETCD_HOST:$BASHLETS_CLIENT_ETCD_PORT/v2/keys/$key")"
+    [ -n "$json" ] && val="$(python -c "import json; o=json.loads('$json'); print(o['node']['value'] if o.get('errorCode') is None else '')")"
+    [ -n "$val" ] && echo $val
+}
+
+#@method
+function bashlets_client_etcd_set()
+{
+	# TODO: check errors
+
+    local key="$1" value="$2"
+
+    curl -sL "http://$BASHLETS_CLIENT_ETCD_HOST:$BASHLETS_CLIENT_ETCD_PORT/v2/keys/$key" -XPUT -d value="$value" > /dev/null
+}
+
+
+# Local variables:
+# mode: shell-script
+# sh-basic-offset: 4
+# sh-indent-comment: t
+# indent-tabs-mode: nil
+# End:
+# ex: ts=4 sw=4 et filetype=sh