Add 'components/rvi_common/' from commit '33c0582abf9aadcb53bbb8c35b0033611da1f589'

git-subtree-dir: components/rvi_common
git-subtree-mainline: 0a07a86e08afd5e91b4a7c688aaf82fe7de07f30
git-subtree-split: 33c0582abf9aadcb53bbb8c35b0033611da1f589

10 files changed, 1180 insertions, 0 deletions

diff --git a/components/rvi_common/.gitignore b/components/rvi_common/.gitignore
new file mode 100644
index 0000000..cfb2329
--- /dev/null
+++ b/components/rvi_common/.gitignore
@@ -0,0 +1 @@
+ebin
diff --git a/components/rvi_common/LICENSE b/components/rvi_common/LICENSE
new file mode 100644
index 0000000..c33dcc7
--- /dev/null
+++ b/components/rvi_common/LICENSE
@@ -0,0 +1,354 @@
+Mozilla Public License, version 2.0
+
+1. Definitions
+
+1.1. “Contributor”
+
+     means each individual or legal entity that creates, contributes to the
+     creation of, or owns Covered Software.
+
+1.2. “Contributor Version”
+
+     means the combination of the Contributions of others (if any) used by a
+     Contributor and that particular Contributor’s Contribution.
+
+1.3. “Contribution”
+
+     means Covered Software of a particular Contributor.
+
+1.4. “Covered Software”
+
+     means Source Code Form to which the initial Contributor has attached the
+     notice in Exhibit A, the Executable Form of such Source Code Form, and
+     Modifications of such Source Code Form, in each case including portions
+     thereof.
+
+1.5. “Incompatible With Secondary Licenses”
+     means
+
+     a. that the initial Contributor has attached the notice described in
+        Exhibit B to the Covered Software; or
+
+     b. that the Covered Software was made available under the terms of version
+        1.1 or earlier of the License, but not also under the terms of a
+        Secondary License.
+
+1.6. “Executable Form”
+
+     means any form of the work other than Source Code Form.
+
+1.7. “Larger Work”
+
+     means a work that combines Covered Software with other material, in a separate
+     file or files, that is not Covered Software.
+
+1.8. “License”
+
+     means this document.
+
+1.9. “Licensable”
+
+     means having the right to grant, to the maximum extent possible, whether at the
+     time of the initial grant or subsequently, any and all of the rights conveyed by
+     this License.
+
+1.10. “Modifications”
+
+     means any of the following:
+
+     a. any file in Source Code Form that results from an addition to, deletion
+        from, or modification of the contents of Covered Software; or
+
+     b. any new file in Source Code Form that contains any Covered Software.
+
+1.11. “Patent Claims” of a Contributor
+
+      means any patent claim(s), including without limitation, method, process,
+      and apparatus claims, in any patent Licensable by such Contributor that
+      would be infringed, but for the grant of the License, by the making,
+      using, selling, offering for sale, having made, import, or transfer of
+      either its Contributions or its Contributor Version.
+
+1.12. “Secondary License”
+
+      means either the GNU General Public License, Version 2.0, the GNU Lesser
+      General Public License, Version 2.1, the GNU Affero General Public
+      License, Version 3.0, or any later versions of those licenses.
+
+1.13. “Source Code Form”
+
+      means the form of the work preferred for making modifications.
+
+1.14. “You” (or “Your”)
+
+      means an individual or a legal entity exercising rights under this
+      License. For legal entities, “You” includes any entity that controls, is
+      controlled by, or is under common control with You. For purposes of this
+      definition, “control” means (a) the power, direct or indirect, to cause
+      the direction or management of such entity, whether by contract or
+      otherwise, or (b) ownership of more than fifty percent (50%) of the
+      outstanding shares or beneficial ownership of such entity.
+
+
+2. License Grants and Conditions
+
+2.1. Grants
+
+     Each Contributor hereby grants You a world-wide, royalty-free,
+     non-exclusive license:
+
+     a. under intellectual property rights (other than patent or trademark)
+        Licensable by such Contributor to use, reproduce, make available,
+        modify, display, perform, distribute, and otherwise exploit its
+        Contributions, either on an unmodified basis, with Modifications, or as
+        part of a Larger Work; and
+
+     b. under Patent Claims of such Contributor to make, use, sell, offer for
+        sale, have made, import, and otherwise transfer either its Contributions
+        or its Contributor Version.
+
+2.2. Effective Date
+
+     The licenses granted in Section 2.1 with respect to any Contribution become
+     effective for each Contribution on the date the Contributor first distributes
+     such Contribution.
+
+2.3. Limitations on Grant Scope
+
+     The licenses granted in this Section 2 are the only rights granted under this
+     License. No additional rights or licenses will be implied from the distribution
+     or licensing of Covered Software under this License. Notwithstanding Section
+     2.1(b) above, no patent license is granted by a Contributor:
+
+     a. for any code that a Contributor has removed from Covered Software; or
+
+     b. for infringements caused by: (i) Your and any other third party’s
+        modifications of Covered Software, or (ii) the combination of its
+        Contributions with other software (except as part of its Contributor
+        Version); or
+
+     c. under Patent Claims infringed by Covered Software in the absence of its
+        Contributions.
+
+     This License does not grant any rights in the trademarks, service marks, or
+     logos of any Contributor (except as may be necessary to comply with the
+     notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+     No Contributor makes additional grants as a result of Your choice to
+     distribute the Covered Software under a subsequent version of this License
+     (see Section 10.2) or under the terms of a Secondary License (if permitted
+     under the terms of Section 3.3).
+
+2.5. Representation
+
+     Each Contributor represents that the Contributor believes its Contributions
+     are its original creation(s) or it has sufficient rights to grant the
+     rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+     This License is not intended to limit any rights You have under applicable
+     copyright doctrines of fair use, fair dealing, or other equivalents.
+
+2.7. Conditions
+
+     Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted in
+     Section 2.1.
+
+
+3. Responsibilities
+
+3.1. Distribution of Source Form
+
+     All distribution of Covered Software in Source Code Form, including any
+     Modifications that You create or to which You contribute, must be under the
+     terms of this License. You must inform recipients that the Source Code Form
+     of the Covered Software is governed by the terms of this License, and how
+     they can obtain a copy of this License. You may not attempt to alter or
+     restrict the recipients’ rights in the Source Code Form.
+
+3.2. Distribution of Executable Form
+
+     If You distribute Covered Software in Executable Form then:
+
+     a. such Covered Software must also be made available in Source Code Form,
+        as described in Section 3.1, and You must inform recipients of the
+        Executable Form how they can obtain a copy of such Source Code Form by
+        reasonable means in a timely manner, at a charge no more than the cost
+        of distribution to the recipient; and
+
+     b. You may distribute such Executable Form under the terms of this License,
+        or sublicense it under different terms, provided that the license for
+        the Executable Form does not attempt to limit or alter the recipients’
+        rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+     You may create and distribute a Larger Work under terms of Your choice,
+     provided that You also comply with the requirements of this License for the
+     Covered Software. If the Larger Work is a combination of Covered Software
+     with a work governed by one or more Secondary Licenses, and the Covered
+     Software is not Incompatible With Secondary Licenses, this License permits
+     You to additionally distribute such Covered Software under the terms of
+     such Secondary License(s), so that the recipient of the Larger Work may, at
+     their option, further distribute the Covered Software under the terms of
+     either this License or such Secondary License(s).
+
+3.4. Notices
+
+     You may not remove or alter the substance of any license notices (including
+     copyright notices, patent notices, disclaimers of warranty, or limitations
+     of liability) contained within the Source Code Form of the Covered
+     Software, except that You may alter any license notices to the extent
+     required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+     You may choose to offer, and to charge a fee for, warranty, support,
+     indemnity or liability obligations to one or more recipients of Covered
+     Software. However, You may do so only on Your own behalf, and not on behalf
+     of any Contributor. You must make it absolutely clear that any such
+     warranty, support, indemnity, or liability obligation is offered by You
+     alone, and You hereby agree to indemnify every Contributor for any
+     liability incurred by such Contributor as a result of warranty, support,
+     indemnity or liability terms You offer. You may include additional
+     disclaimers of warranty and limitations of liability specific to any
+     jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+
+   If it is impossible for You to comply with any of the terms of this License
+   with respect to some or all of the Covered Software due to statute, judicial
+   order, or regulation then You must: (a) comply with the terms of this License
+   to the maximum extent possible; and (b) describe the limitations and the code
+   they affect. Such description must be placed in a text file included with all
+   distributions of the Covered Software under this License. Except to the
+   extent prohibited by statute or regulation, such description must be
+   sufficiently detailed for a recipient of ordinary skill to be able to
+   understand it.
+
+5. Termination
+
+5.1. The rights granted under this License will terminate automatically if You
+     fail to comply with any of its terms. However, if You become compliant,
+     then the rights granted under this License from a particular Contributor
+     are reinstated (a) provisionally, unless and until such Contributor
+     explicitly and finally terminates Your grants, and (b) on an ongoing basis,
+     if such Contributor fails to notify You of the non-compliance by some
+     reasonable means prior to 60 days after You have come back into compliance.
+     Moreover, Your grants from a particular Contributor are reinstated on an
+     ongoing basis if such Contributor notifies You of the non-compliance by
+     some reasonable means, this is the first time You have received notice of
+     non-compliance with this License from such Contributor, and You become
+     compliant prior to 30 days after Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+     infringement claim (excluding declaratory judgment actions, counter-claims,
+     and cross-claims) alleging that a Contributor Version directly or
+     indirectly infringes any patent, then the rights granted to You by any and
+     all Contributors for the Covered Software under Section 2.1 of this License
+     shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all end user
+     license agreements (excluding distributors and resellers) which have been
+     validly granted by You or Your distributors under this License prior to
+     termination shall survive termination.
+
+6. Disclaimer of Warranty
+
+   Covered Software is provided under this License on an “as is” basis, without
+   warranty of any kind, either expressed, implied, or statutory, including,
+   without limitation, warranties that the Covered Software is free of defects,
+   merchantable, fit for a particular purpose or non-infringing. The entire
+   risk as to the quality and performance of the Covered Software is with You.
+   Should any Covered Software prove defective in any respect, You (not any
+   Contributor) assume the cost of any necessary servicing, repair, or
+   correction. This disclaimer of warranty constitutes an essential part of this
+   License. No use of  any Covered Software is authorized under this License
+   except under this disclaimer.
+
+7. Limitation of Liability
+
+   Under no circumstances and under no legal theory, whether tort (including
+   negligence), contract, or otherwise, shall any Contributor, or anyone who
+   distributes Covered Software as permitted above, be liable to You for any
+   direct, indirect, special, incidental, or consequential damages of any
+   character including, without limitation, damages for lost profits, loss of
+   goodwill, work stoppage, computer failure or malfunction, or any and all
+   other commercial damages or losses, even if such party shall have been
+   informed of the possibility of such damages. This limitation of liability
+   shall not apply to liability for death or personal injury resulting from such
+   party’s negligence to the extent applicable law prohibits such limitation.
+   Some jurisdictions do not allow the exclusion or limitation of incidental or
+   consequential damages, so this exclusion and limitation may not apply to You.
+
+8. Litigation
+
+   Any litigation relating to this License may be brought only in the courts of
+   a jurisdiction where the defendant maintains its principal place of business
+   and such litigation shall be governed by laws of that jurisdiction, without
+   reference to its conflict-of-law provisions. Nothing in this Section shall
+   prevent a party’s ability to bring cross-claims or counter-claims.
+
+9. Miscellaneous
+
+   This License represents the complete agreement concerning the subject matter
+   hereof. If any provision of this License is held to be unenforceable, such
+   provision shall be reformed only to the extent necessary to make it
+   enforceable. Any law or regulation which provides that the language of a
+   contract shall be construed against the drafter shall not be used to construe
+   this License against a Contributor.
+
+
+10. Versions of the License
+
+10.1. New Versions
+
+      Mozilla Foundation is the license steward. Except as provided in Section
+      10.3, no one other than the license steward has the right to modify or
+      publish new versions of this License. Each version will be given a
+      distinguishing version number.
+
+10.2. Effect of New Versions
+
+      You may distribute the Covered Software under the terms of the version of
+      the License under which You originally received the Covered Software, or
+      under the terms of any subsequent version published by the license
+      steward.
+
+10.3. Modified Versions
+
+      If you create software not governed by this License, and you want to
+      create a new license for such software, you may create and use a modified
+      version of this License if you rename the license and remove any
+      references to the name of the license steward (except to note that such
+      modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary Licenses
+      If You choose to distribute Source Code Form that is Incompatible With
+      Secondary Licenses under the terms of this version of the License, the
+      notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+
+      This Source Code Form is subject to the
+      terms of the Mozilla Public License, v.
+      2.0. If a copy of the MPL was not
+      distributed with this file, You can
+      obtain one at
+      http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular file, then
+You may include the notice in a location (such as a LICENSE file in a relevant
+directory) where a recipient would be likely to look for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - “Incompatible With Secondary Licenses” Notice
+
+      This Source Code Form is “Incompatible
+      With Secondary Licenses”, as defined by
+      the Mozilla Public License, v. 2.0.
+
diff --git a/components/rvi_common/Makefile b/components/rvi_common/Makefile
new file mode 100644
index 0000000..f6ce39f
--- /dev/null
+++ b/components/rvi_common/Makefile
@@ -0,0 +1,20 @@
+.PHONY:	all deps compile clean recomp
+
+
+all: deps compile
+
+deps:
+	rebar get-deps
+
+compile:
+	rebar compile
+
+recomp:
+	rebar compile skip_deps=true
+
+clean:
+	rebar clean
+
+
+
+
diff --git a/components/rvi_common/README.md b/components/rvi_common/README.md
new file mode 100644
index 0000000..9c0852f
--- /dev/null
+++ b/components/rvi_common/README.md
@@ -0,0 +1 @@
+Better documentation will come.
diff --git a/components/rvi_common/rebar.config b/components/rvi_common/rebar.config
new file mode 100644
index 0000000..ba687be
--- /dev/null
+++ b/components/rvi_common/rebar.config
@@ -0,0 +1,9 @@
+%% -*- erlang -*-
+
+{ erl_opts, [debug_info]}.
+
+{deps,
+ [
+  {lager, ".*", {git, "git://github.com/Feuerlabs/lager.git", "1.0.0.fl.3"}},
+  {exo,  ".*", {git, "git://github.com/Feuerlabs/exo.git",  "1.2"}}
+ ]}.
diff --git a/components/rvi_common/src/exoport_exo_http.erl b/components/rvi_common/src/exoport_exo_http.erl
new file mode 100644
index 0000000..8ab6d0d
--- /dev/null
+++ b/components/rvi_common/src/exoport_exo_http.erl
@@ -0,0 +1,240 @@
+%%
+%% Copyright (C) 2014, Feuerlabs 
+%%
+%% This program is licensed under the terms and conditions of the
+%% Mozilla Public License, version 2.0.  The full text of the 
+%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
+%%
+-module(exoport_exo_http).
+-export([instance/3,
+	 handle_body/4,
+%%	 json_rpc/1,
+%%	 json_rpc/2,
+	 data_to_json/3]).
+
+-include_lib("exo/include/exo_http.hrl").
+-include_lib("lager/include/log.hrl").
+
+
+instance(SupMod, AppMod, Opts) ->
+    ?debug("exoport_exo_http:instance(): SupModule(~p), Opts(~p)",
+	   [ SupMod, Opts]),
+    Port = opt(port, Opts, 8800),
+
+    Child = {exo_http, {exo_http_server, start_link,
+			[Port, [{request_handler,
+				 {?MODULE, handle_body, [AppMod]}}]]},
+	     permanent, 5000, worker, [exo_http_server]},
+    case supervisor:start_child(SupMod, Child) of
+	{ok, _} -> ok;
+	{ok, _, _} -> ok;
+	Err -> Err
+    end.
+
+
+handle_body(Socket, Request, Body, AppMod) when Request#http_request.method == 'POST' ->
+    try decode_json(Body) of
+	{call, Id, Method, Args} ->
+	    case handle_rpc(AppMod, Method, Args) of
+		{ok, Reply} ->
+		    success_response(Socket, Id, Reply);
+		ok ->
+		    ok;
+		{error, Error} ->
+		    error_response(Socket, Id, Error)
+	    end;
+	{notification, _Method, _Args} ->
+	    %% FIXME: Notification.
+	    exo_http_server:response(Socket, undefined, 200, "OK", "");
+	{error, _} ->
+	    error_response(Socket, parse_error)
+    catch
+	error:_ ->
+	    exo_http_server:response(Socket, undefined, 501,
+				     "Internal Error",
+				     "Internal Error")
+    end;
+
+handle_body(Socket, _Request, _Body, _AppMod) ->
+    exo_http_server:response(Socket, undefined, 404, "Not Found",
+			     "Object not found. Try using POST method.").
+
+
+%% Validated RPC
+handle_rpc(Mod, Method, Args) ->
+    ?debug("exoport_exo_http_server:handle_rpc(): Mod:       ~p", [Mod]),
+    ?debug("exoport_exo_http_server:handle_rpc(): Method:    ~p", [Method]),
+    ?debug("exoport_exo_http_server:handle_rpc(): Args:      ~p", [Args]),
+
+    try Mod:handle_rpc(Method, Args) of
+	{ok, Result} ->
+	    ?debug("exoport_exo_http_server:handle_rpc(ok): Result:   ~p", [Result]),
+	    {ok, Result};
+	
+	{error, Reason} ->
+	    {error, Reason}
+    catch
+	error:Crash ->
+            ?error("rpc_callback() CRASHED: Reason:   ~p", [Crash]),
+            ?error("post_request() CRASHED: Stack:    ~p", [erlang:get_stacktrace()]),
+	    {error, {internal_error, Crash}}
+    end.
+
+success_response(Socket, Id, Reply) ->
+    JSON = {struct, [{"jsonrpc", "2.0"},
+		     {"id", Id},
+		     {"result", {struct,  Reply}}]},
+    exo_http_server:response(Socket, undefined, 200, "OK",
+			     exo_json:encode(JSON),
+			     [{content_type, "application/json"}]).
+
+error_response(Socket, Error) ->
+    %% No Id available
+    JSON = {struct, [{"jsonrpc", "2.0"},
+		     {"error", {struct,
+				[{"code", json_error_code(Error)},
+				 {"message", json_error_msg(Error)}]}}]},
+    Body = list_to_binary(exo_json:encode(JSON)),
+    exo_http_server:response(Socket, undefined, 200, "OK", Body,
+			     [{content_type, "application/json"}]).
+
+error_response(Socket, Id, Error) ->
+    JSON = {struct, [{"jsonrpc", "2.0"},
+		     {"id", Id},
+		     {"error", {struct,
+				[{"code", json_error_code(Error)},
+				 {"message", json_error_msg(Error)}]}}]},
+    Body = list_to_binary(exo_json:encode(JSON)),
+    exo_http_server:response(Socket, undefined, 200, "OK", Body,
+			     [{content_type, "application/json"}]).
+
+decode_json(Body) ->
+    try exo_json:decode_string(binary_to_list(Body)) of
+	{ok, {struct,Elems}} ->
+	    case [opt(K,Elems,undefined) || K <- ["jsonrpc","id",
+						  "method", "params"]] of
+		["2.0",undefined,Method,Params]
+		  when Method =/= undefined,
+		       Params =/= undefined ->
+		    {notification, Method, Params};
+		["2.0",Id,Method,Params]
+		  when Id=/=undefined,
+		       Method=/=undefined,
+		       Params =/= undefined ->
+		    {call, Id, Method, Params};
+		_ ->
+		    {error, invalid}
+	    end
+    catch
+	error:_ ->
+	    {error, parse_error}
+    end.
+
+json_error_code(parse_error     )  -> -32700;
+json_error_code(invalid_request )  -> -32600;
+json_error_code(method_not_found)  -> -32601;
+json_error_code(invalid_params  )  -> -32602;
+json_error_code(internal_error  )  -> -32603;
+json_error_code(_) -> -32603. % internal error
+
+
+json_error_msg(-32700) -> "parse error";
+json_error_msg(-32600) -> "invalid request";
+json_error_msg(-32601) -> "method not found";
+json_error_msg(-32602) -> "invalid params";
+json_error_msg(-32603) -> "internal error";
+json_error_msg(Code) when Code >= -32099, Code =< -32000 -> "server error";
+json_error_msg(_) -> "json error".
+
+opt(K, L, Def) ->
+    case lists:keyfind(K, 1, L) of
+	{_, V} -> V;
+	false  -> Def
+    end.
+
+
+%%
+data_to_json(Elems, Env, Data) ->
+    ?debug("data_to_json(~p, ~p, ~p)~n", [Elems, Env, Data]),
+    case find_leaf(<<"rpc-status-string">>, Elems) of
+        false ->
+            yang_json:data_to_json(Elems, Env, Data);
+        _Leaf ->
+            case keyfind(<<"rpc-status-string">>, Data) of
+                false ->
+                    case keyfind(<<"rpc-status">>, Data) of
+                        false ->
+                            yang_json:data_to_json(Elems, Env, Data);
+                        Status ->
+                            case enum_descr(find_leaf(<<"rpc-status">>, Elems),
+                                            to_binary(element(2, Status))) of
+                                false ->
+                                    yang_json:data_to_json(Elems, Env, Data);
+                                Descr ->
+                                    yang_json:data_to_json(
+                                      Elems, Env,
+                                      [{<<"rpc-status-string">>, Descr}|Data])
+                            end
+                    end;
+                _ ->
+                    yang_json:data_to_json(Elems, Env, Data)
+            end
+    end.
+
+enum_descr(false, _) -> false;
+enum_descr({leaf, _, _, I}, V) ->
+    case lists:keyfind(type, 1, I) of
+        {_, _, <<"enumeration">>, I1} ->
+            enum_descr_(I1, V);
+        _ ->
+            false
+    end.
+
+%% Assume rpc-status can be either the numeric value or the description.
+enum_descr_([{enum,_,V,I}|_], V) ->
+    case lists:keyfind(description,1,I) of
+        {_, _, Descr, _} -> Descr;
+        false -> V
+    end;
+enum_descr_([{enum,_,D,I}|T], V) ->
+    case lists:keyfind(value, 1, I) of
+        {_, _, V, _} ->
+            case lists:keyfind(description,1,I) of
+                {_, _, Descr, _} -> Descr;
+                false -> D
+            end;
+        _ ->
+            enum_descr_(T, V)
+    end;
+enum_descr_([_|T], V) ->
+    enum_descr_(T, V);
+enum_descr_([], _) ->
+    false.
+
+
+
+find_leaf(K, [{leaf,_,K,_} = L|_]) -> L;
+find_leaf(K, [_|T]) -> find_leaf(K, T);
+find_leaf(_, []) -> false.
+
+keyfind(A, [H|T]) when is_tuple(H) ->
+    K = element(1, H),
+    case comp(A,K) of
+        true ->
+            H;
+        false ->
+            keyfind(A, T)
+    end;
+keyfind(_, []) ->
+    false.
+
+comp(A, A) -> true;
+comp(A, B) when is_binary(A), is_list(B) ->
+    binary_to_list(A) == B;
+comp(A, B) when is_binary(A), is_atom(B) ->
+    A == atom_to_binary(B, latin1);
+comp(_, _) ->
+    false.
+
+to_binary(B) when is_binary(B) -> B;
+to_binary(L) when is_list(L) -> list_to_binary(L).
diff --git a/components/rvi_common/src/rvi_common.app.src b/components/rvi_common/src/rvi_common.app.src
new file mode 100644
index 0000000..4878e37
--- /dev/null
+++ b/components/rvi_common/src/rvi_common.app.src
@@ -0,0 +1,24 @@
+%%
+%% Copyright (C) 2014, Jaguar Land Rover
+%%
+%% This program is licensed under the terms and conditions of the
+%% Mozilla Public License, version 2.0.  The full text of the 
+%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
+%%
+
+
+%% -*- erlang -*-
+{application, rvi_common,
+ [
+  {description, ""},
+  {vsn, "0.1"},
+  {registered, []},
+  {applications, [
+                  kernel,
+                  stdlib
+                 ]},
+  {mod, { rvi_common_app, []}},
+  {env, [
+	 {yang_spec_modules, [{"$PRIV_DIR/yang", "yang_spec_*.beam"}]}
+	]}
+ ]}.
diff --git a/components/rvi_common/src/rvi_common.erl b/components/rvi_common/src/rvi_common.erl
new file mode 100644
index 0000000..42b2c1e
--- /dev/null
+++ b/components/rvi_common/src/rvi_common.erl
@@ -0,0 +1,462 @@
+%%
+%% Copyright (C) 2014, Jaguar Land Rover
+%%
+%% This program is licensed under the terms and conditions of the
+%% Mozilla Public License, version 2.0.  The full text of the 
+%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
+%%
+
+
+-module(rvi_common).
+
+%%-include_lib("lhttpc/include/lhttpc.hrl").
+-include_lib("lager/include/log.hrl").
+
+-export([send_http_request/3]).
+-export([send_component_request/3]).
+-export([send_component_request/4]).
+-export([find_component_address/1]).
+-export([json_rpc_status/1]).
+-export([get_json_element/2]).
+-export([sanitize_service_string/1]).
+-export([local_service_to_string/1]).
+-export([local_service_to_string/2]).
+-export([remote_service_to_string/1]).
+-export([remote_service_to_string/2]).
+-export([local_service_prefix/0]).
+-export([find_static_node/1]).
+-export([static_nodes/0]).
+-export([is_local_service/1]).
+-export([node_address_string/0]).
+-export([node_address_tuple/0]).
+-export([get_request_result/1]).
+-export([get_component_config/1]).
+-export([get_component_config/2]).
+-export([get_component_config/3]).
+
+
+-define(NODE_SERVICE_PREFIX, node_service_prefix).
+-define(NODE_ADDRESS, node_address).
+-define(STATIC_NODES, static_nodes).
+
+
+json_rpc_status(0) ->
+    ok;
+
+json_rpc_status("0") ->
+    ok;
+
+json_rpc_status(1) ->
+    invalid_command;
+
+json_rpc_status("1") ->
+    invalid_command;
+
+json_rpc_status(2) ->
+    not_found;
+
+json_rpc_status("2") ->
+    not_found;
+
+json_rpc_status(3) ->
+    not_available;
+
+json_rpc_status("3") ->
+    not_available;
+
+json_rpc_status(4) ->
+    internal;
+
+json_rpc_status("4") ->
+    internal;
+
+json_rpc_status(5) ->
+    already_connected;
+
+json_rpc_status("5") ->
+    already_connected;
+
+
+json_rpc_status(Unknown) when is_integer(Unknown)->
+    undefined;
+
+json_rpc_status(Unknown) when is_list(Unknown)->
+    undefined;
+
+json_rpc_status(ok) ->
+    0;
+
+json_rpc_status(invalid_command) ->
+    1;
+
+json_rpc_status(not_found) ->
+    2;
+
+json_rpc_status(not_available) ->
+    3;
+
+json_rpc_status(internal) ->
+    4;
+
+json_rpc_status(already_connected) ->
+    5;
+
+json_rpc_status(_) ->
+    999.
+
+get_request_result({ok, {http_response, {_V1, _V2}, 200, _Text, _Hdr}, JSONBody}) ->
+    case get_json_element(["result", "status"], JSONBody) of 
+	{ok, Value} ->
+	    { ok, json_rpc_status(Value), JSONBody };
+
+	{ error, undefined} ->
+	    {ok, undefined }
+    end;
+
+get_request_result({ok, {http_response, {_V1, _V2}, Status, Reason, _Hdr}, _JSONBody}) ->
+    {error, {http, Status, Reason}};
+
+get_request_result({error, Reason})->
+    { error, Reason};
+
+get_request_result(ok)->
+    { ok, ok, "{}"};
+
+get_request_result(Other)->
+    ?error("get_request_result(): Unhandled result: ~p", [Other]),    
+    { error, format}.
+
+			
+%% Send a request to another component (service_edge, authorize, etc).
+send_component_request(Component, Service, ArgList) ->
+    case send_component_request(Component, Service, ArgList, []) of
+	{ ok, Status, _, Body} ->
+	    { ok, Status, Body };
+
+	Err -> Err
+    end.
+
+send_component_request(Component, Service, ArgList, ReturnParams) ->
+    Address = rvi_common:find_component_address(Component),
+
+    %% ?debug("send_component_request(): Component:      ~p", [ Component]),
+    %% ?debug("send_component_request(): Address:        ~p", [ Address ]),
+    %% ?debug("send_component_request(): Service:        ~p", [ Service]),
+    %% ?debug("send_component_request(): ArgList:        ~p", [ ArgList]),
+    %% ?debug("send_component_request(): ReturnParams:   ~p", [ ReturnParams]),
+
+    case get_request_result(
+	   send_http_request(Address, atom_to_list(Service),  ArgList)
+	  ) of
+	{ok, Status, JSONBody} ->
+	    ReturnVal = retrieve_reply_elements(ReturnParams, JSONBody),
+	    { ok, Status, ReturnVal, JSONBody };
+		
+	Err -> Err
+    end.
+
+send_http_request(Url,Method, Args) ->
+
+    Req = binary_to_list(
+	    iolist_to_binary(
+	      exo_json:encode({struct, [{"jsonrpc", "2.0"},
+					{"id", 1},
+					{"method",  Method},
+					{"params", {struct, Args}}
+				       ]
+			      }))),
+
+    Hdrs = [{'Content-Type', "application/json"} ],
+    ?debug("rvi_common:send_http_request() Sending:      ~p", [Req]),
+    try
+        exo_http:wpost(Url, {1,1}, Hdrs, Req, 1000)
+    catch
+        Type:Reason ->
+            ?error("rvi_common:send_http_request() CRASHED: URL:      ~p", [Url]),
+            ?error("rvi_common:send_http_request() CRASHED: Hdrs:     ~p", [Hdrs]),
+            ?error("rvi_common:send_http_request() CRASHED: Body:     ~p", [Req]),
+            ?error("rvi_common:send_http_request() CRASHED: Type:     ~p", [Type]),
+            ?error("rvi_common:send_http_request() CRASHED: Reason:   ~p", [Reason]),
+            ?error("rvi_common:send_http_request() CRASHED: Stack:    ~p", [ erlang:get_stacktrace()]),
+            {error, internal}
+    end.
+	
+
+find_component_address(Component) when is_atom(Component) ->
+    %% Locate the correct service address for the given component
+    case get_component_config(Component, url) of
+	{ok, URL } -> URL;
+	_ -> undefined
+    end.
+
+
+%% If Path is just a single element, convert to list and try again.
+get_json_element(ElemPath, JSON) when is_atom(ElemPath) ->
+    get_json_element([ElemPath], JSON);
+
+get_json_element(ElemPath, JSON) when is_binary(JSON) ->
+    get_json_element(ElemPath, binary_to_list(JSON));
+
+get_json_element(ElemPath, JSON) when is_tuple(JSON) ->
+    get_json_element_(ElemPath, JSON);
+
+get_json_element(ElemPath, JSON) when is_list(JSON) ->
+    case  exo_json:decode_string(JSON) of
+	{ok,  Data } ->
+	    get_json_element_(ElemPath, Data);
+
+	Err -> 
+	    Err
+    end;
+
+get_json_element(P, J) ->
+    ?warning("get_json_element(): Unknown call structure; Path: ~p | JSON: ~p",
+	      [P, J]),
+    {error, call, {P, J}}.
+
+get_json_element_(_, undefined) ->
+    { error, undefined };
+
+get_json_element_([], {array, JSON}) ->
+    {ok, JSON};
+
+get_json_element_([], {struct, JSON}) ->
+    {ok, JSON};
+
+get_json_element_([], JSON) ->
+    {ok, JSON};
+
+
+%% All proplist keys in JSON are strings. 
+%% Convert atomically provided path elements to strings
+get_json_element_([Elem | T], JSON ) when is_atom(Elem) ->
+    get_json_element_([atom_to_list(Elem) | T], JSON);
+
+get_json_element_([Elem | T], {struct, JSON} ) ->
+    Res = get_json_element_(T, proplists:get_value(Elem, JSON, undefined)),
+    Res;
+
+get_json_element_([Elem | T], {array, JSON} ) ->
+    Res = get_json_element_(T, proplists:get_value(Elem, JSON, undefined)),
+    Res;
+
+get_json_element_(Path,JSON) ->
+    ?warning("get_json_element_(): Unhandled: Path: ~p | JSON: ~p",
+	     [Path, JSON]),
+    { error, undefined }.
+
+    
+retrieve_reply_elements(Elem, JSON) ->
+    retrieve_reply_elements(Elem, JSON, []).
+
+retrieve_reply_elements([], _, Acc) ->
+    lists:reverse(Acc);
+
+retrieve_reply_elements([Elem | T], JSON, Acc) when is_atom(Elem) ->
+    retrieve_reply_elements([[Elem] | T], JSON, Acc);
+    
+
+retrieve_reply_elements([Elem | T], JSON, Acc) when is_list(Elem) ->
+    %% prefix with result since that is where all reply elements are stored.
+    case get_json_element([ result | Elem ], JSON) of 
+	{ ok, Value } ->
+	    retrieve_reply_elements(T, JSON, [ Value | Acc ]);
+	{ error, undefined } ->
+	    retrieve_reply_elements(T, JSON, [ undefined | Acc ])
+    end.
+
+
+sanitize_service_string(Service) when is_binary(Service) ->
+    sanitize_service_string(binary_to_list(Service));
+
+sanitize_service_string(Service) when is_list(Service) ->
+    %% Check if message type is specced.
+    %% rpc:/jaguarlandrover.com/1234/hvac",
+    %% If so, drop message type.
+    case string:tokens(Service, ":") of
+	[ Res ] -> 
+	    Res;
+
+	[_Type, Res ] ->
+	    Res
+    end.
+
+
+
+local_service_to_string(Type, Svc) ->
+    Type ++ ":" ++ local_service_to_string(Svc).
+
+
+%% Make sure we don't get two slashes between the prefix and the service name
+local_service_to_string([ $/ | Service]) ->
+    local_service_prefix() ++ Service;
+
+%% Make sure we don't get two slashes
+local_service_to_string(Svc) ->
+    local_service_prefix() ++ Svc.
+
+remote_service_to_string(Service) ->
+    Service.
+
+remote_service_to_string(Type, Service) ->
+    Type ++ ":" ++ Service.
+
+local_service_prefix() ->
+    Prefix = 
+	case application:get_env(rvi, ?NODE_SERVICE_PREFIX) of
+	    {ok, P} when is_atom(P) -> atom_to_list(P);
+	    {ok, P} when is_list(P) -> P;
+	    undefined -> 
+		?debug("WARNING: Please set application rvi environment ~p", 
+			  [?NODE_SERVICE_PREFIX]),
+		error({missing_env, ?NODE_SERVICE_PREFIX})
+	end,
+
+    %% Tag on a trailing slash if not there already.
+    case lists:last(Prefix) of
+	$/ -> Prefix;
+
+	_ -> Prefix ++ "/"
+    end.
+
+static_nodes() ->
+    case application:get_env(rvi, ?STATIC_NODES) of
+
+	{ok, NodeList} -> 
+	    NodeList;
+
+	undefined -> 
+	    not_found
+    end.
+
+
+%% Locate the statically configured node whose service(s) prefix-
+%% matches the provided service.
+%% FIXME: Longest prefix match.
+find_static_node(Service) ->
+	case application:get_env(rvi, ?STATIC_NODES) of
+
+	    {ok, NodeList} when is_list(NodeList) -> 
+		find_static_node(Service, NodeList);
+
+	    undefined -> 
+		?debug("No ~p configured under rvi.", [?STATIC_NODES]),
+		not_found
+	end.
+
+find_static_node(_Service, []) ->
+    not_found;
+
+%% Validate that argumenst are all lists.
+find_static_node(Service, [{ SvcPrefix, NetworkAddress} | T ]) when 
+      not is_list(Service); not is_list(SvcPrefix); not is_list(NetworkAddress) ->
+    ?warning("rvi_common:find_static_node(): Could not resolve ~p against {~p, ~p}:"
+	     "One or more elements not strings.",  [ Service, SvcPrefix, NetworkAddress]),
+    find_static_node(Service, T );
+    
+
+%% If the service we are trying to resolve has a shorter name than
+%% the prefix we are comparing with, ignore.
+find_static_node(Service, [{ SvcPrefix, _NetworkAddress } | T ]) when 
+      length(Service) < length(SvcPrefix) ->
+    ?debug("rvi_common:find_static_node(): Service: ~p is shorter than prefix ~p. Ignore.",
+	   [ Service, SvcPrefix]),
+    find_static_node(Service, T );
+
+find_static_node(Service, [{ SvcPrefix, NetworkAddress} | T] ) ->
+    case string:str(Service, SvcPrefix) of
+	1 ->
+	    ?debug("rvi_common:find_static_node(): Service: ~p -> { ~p, ~p}.",
+		   [ Service, SvcPrefix, NetworkAddress]),
+	    NetworkAddress;
+	_ ->
+	    ?debug("rvi_common:find_static_node(): Service: ~p != { ~p, ~p}.",
+		   [ Service, SvcPrefix, NetworkAddress]),
+	    find_static_node(Service, T )
+    end.
+	    
+%% Return true if the provided service is locally connected to this
+%% node. In such cases, service edge should just bounce the request
+%% off directly to the targeted service without invoking the rest of
+%% the RVI structure.
+%%
+is_local_service(Service) ->
+     case application:get_env(rvi, ?NODE_SERVICE_PREFIX) of
+ 	{ok, P} when is_list(P) -> 
+	     case string:str(sanitize_service_string(Service), P) of
+ 		1 -> 
+ 		    ?debug("is_local_service(~p): Is local", [ Service ]),
+ 		    true;				
+
+ 		Err -> 
+ 		    ?debug("is_local_service(~p): Not local: ~p", [ Service, Err ]),
+ 		    false
+ 	    end;
+	    
+ 	undefined -> 
+ 	    ?warning("WARNING: Please set application rvi environment ~p", 
+ 		      [?NODE_SERVICE_PREFIX]),
+ 	    false
+     end.
+
+
+node_address_string() ->
+    case application:get_env(rvi, ?NODE_ADDRESS) of
+	{ok, P} when is_atom(P) -> atom_to_list(P);
+	{ok, P} when is_list(P) -> P;
+	undefined -> 
+	    ?warning("WARNING: Please set application rvi environment ~p", 
+		      [?NODE_ADDRESS]),
+	    error({missing_env, ?NODE_ADDRESS})
+    end.
+
+node_address_tuple() ->
+    case node_address_string() of
+	{missing_env, _} = Err -> Err;
+	Addr ->
+	    [ Address, Port ] = string:tokens(Addr, ":"),	
+	    { Address, list_to_integer(Port) }
+    end.
+
+get_component_config(Component) ->
+    case application:get_env(rvi, components, undefined) of
+	undefined -> 
+	    {error, {missing_env, {rvi, { component, [ ]}}}};
+
+	CompList ->
+	    case proplists:get_value(Component, CompList, undefined) of
+		undefined ->
+		    Err = {missing_env, {rvi, { component, [ { Component, {}} ]}}},
+		    ?debug("get_component_config(): Missing app environment: ~p",
+			   [Err]),
+		     {error, Err};
+	
+		CompConf ->
+		    {ok, CompConf}
+	    end
+    end.
+	
+get_component_config(Component, Key) ->
+    case get_component_config(Component) of
+	{ok, PropList } ->
+	    
+	    case proplists:get_value(Key, PropList, undefined ) of
+
+		undefined ->
+		    Err = {missing_env, {rvi, { component, [ { Component, { Key, {}}} ]}}},
+		    ?warning("get_component_config(): Missing app environment: ~p", [Err]),
+		    {error, Err};
+
+		Config-> 
+		     {ok, Config }
+	    end;
+	Err -> Err
+    end.
+
+get_component_config(Component, Key, Default) ->
+    case get_component_config(Component) of
+	{ok, PropList } ->
+	    {ok, proplists:get_value(Key, PropList, Default)};
+
+	Err -> Err
+    end.
diff --git a/components/rvi_common/src/rvi_common_app.erl b/components/rvi_common/src/rvi_common_app.erl
new file mode 100644
index 0000000..f0ad2f5
--- /dev/null
+++ b/components/rvi_common/src/rvi_common_app.erl
@@ -0,0 +1,30 @@
+%%
+%% Copyright (C) 2014, Jaguar Land Rover
+%%
+%% This program is licensed under the terms and conditions of the
+%% Mozilla Public License, version 2.0.  The full text of the 
+%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
+%%
+
+
+-module(rvi_common_app).
+
+-behaviour(application).
+
+%% Application callbacks
+-export([start/2,
+	 start_phase/3,
+	 stop/1]).
+
+%% ===================================================================
+%% Application callbacks
+%% ===================================================================
+
+start(_StartType, _StartArgs) ->
+    rvi_common_sup:start_link().
+
+start_phase(_, _, _) ->
+    ok.
+
+stop(_State) ->
+    ok.
diff --git a/components/rvi_common/src/rvi_common_sup.erl b/components/rvi_common/src/rvi_common_sup.erl
new file mode 100644
index 0000000..204086d
--- /dev/null
+++ b/components/rvi_common/src/rvi_common_sup.erl
@@ -0,0 +1,39 @@
+%%
+%% Copyright (C) 2014, Jaguar Land Rover
+%%
+%% This program is licensed under the terms and conditions of the
+%% Mozilla Public License, version 2.0.  The full text of the 
+%% Mozilla Public License is at https://www.mozilla.org/MPL/2.0/
+%%
+
+
+-module(rvi_common_sup).
+
+-behaviour(supervisor).
+
+%% API
+-export([start_link/0]).
+
+%% Supervisor callbacks
+-export([init/1]).
+
+%% Helper macro for declaring children of supervisor
+-define(CHILD(I, Type), {I, {I, start_link, []}, permanent, 5000, Type, [I]}).
+
+%% ===================================================================
+%% API functions
+%% ===================================================================
+
+start_link() ->
+    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+%% ===================================================================
+%% Supervisor callbacks
+%% ===================================================================
+
+init([]) ->
+    {ok, { {one_for_one, 5, 10},
+	   [ 
+%%	    ?CHILD(service_edge_can, worker),
+	   ]} }.
+