Posts

An overseas engineer uses the Boost C++ library for related project development. Seeing the STL syntax in their code made me realize I should take some time to study this — at minimum, to be able to read the code properly. From Wikipedia: http://en.wikipedia.org/wiki/Standard_Template_Library The Standard Template Library (STL) is a C++ software library that influenced many parts of the C++ Standard Library. It provides four components called algorithms, containers, functional, and iterators. ...

Patch Commands Create a patch file: diff -Naur [from-file] [to-file] > [YourFileName.patch] -N: If a file is only in one directory, treat it as present but empty in the other -a: Treat all files as text -u: Use unified output format -r: Recursively compare subdirectories SVN — Remove all .svn directories $ rm -rf `find . -type d -name .svn` Git — Remove .git Only need to remove the .git directory at the root of the project. ...

msgpack-idl How-To Step 1: Get the msgpack-idl $ git clone git://github.com/msgpack/msgpack-idl.git Step 2: Install the required Ruby tool $ sudo apt-get install ruby1.9.1 Step 3: Go to msgpack-idl folder $ sudo gem install msgpack-idl $ sudo msgpack-idl --install java Step 4: Create a sample file sample with the following content: message Node { 1: string address 2: map<string,string> properties 3: optional string? description } message StorageNode < Node { 4: long capacity 5: optional int weight = 1 } Step 5: Generate Java code with the following commands: ...

Message pack with RPC extension required 3 packages. msgpack msgpack-rpc mpio The msgpack and mpio are required by msgpack-rpc. The following are openwrt makefiles that I use to build the packages. msgpack library include $(TOPDIR)/rules.mk PKG_NAME:=msgpack PKG_VERSION:=0.5.7 PKG_RELEASE:=1 PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz PKG_SOURCE_URL:=http://msgpack.org/releases/cpp/ PKG_MD5SUM:=705106a9378c792fe22d285dba5c142c PKG_INSTALL:=1 include $(INCLUDE_DIR)/package.mk define Package/msgpack SECTION:=libs CATEGORY:=Libraries TITLE:=Message Pack library URL:=http://msgpack.org endef define Package/msgpack/description MessagePack is an efficient binary serialization format. It lets you exchange data among multiple languages like JSON but it’s faster and smaller. endef ...

A quick compilation of useful commands and configurations I frequently use in my daily operations. Working with Patches To generate a patch from a single file or directory: diff -Naur [from-file] [to-file] > [YourFileName.patch] -N: Treat absent files as empty. -a: Treat all files as text. -u: Unified output format (best for readability). -r: Recursive directory comparison. Version Control Cleanup Removing all .svn directories recursively: rm -rf `find . -type d -name .svn` Removing Git Metadata: In a Git repository, simply deleting the root .git directory is usually sufficient to remove history and configuration. ...

Our company’s git server does not support SSL verify but does support username/password authentication. Git enables SSL verification by default when accessing HTTPS URLs. You may encounter the following error: error: Problem with the SSL CA cert (path? access rights?) while accessing https://tw.ubnt.com/git/example.git/info/refs fatal: HTTP request failed To fix this, disable SSL verification globally: git config --global http.sslVerify false Then clone again: $ git clone https://tw.ubnt.com/git/example.git Cloning into 'test'... Username for 'https://tw.ubnt.com': name Password for 'https://[email protected]': password remote: Counting objects: 1054, done. remote: Compressing objects: 100% (674/674), done. remote: Total 1054 (delta 390), reused 747 (delta 290) Receiving objects: 100% (1054/1054), 14.45 MiB | 377 KiB/s, done. Resolving deltas: 100% (390/390), done. Done!

When I had an engineering discussion with an overseas engineer, I found that he uses a third-party library called MessagePack for binary serialization in internet applications. More detailed information about MessagePack is here: http://msgpack.org/ I’m not sure yet what the full differences are between these two libraries, and I couldn’t find a detailed comparison online. So I’ll spend some time studying both.

The statusapi.pb-c.h and statusapi.pb-c.c are generated. Only header file is printing here for further explaination. statusap.pb-c.h /* Generated by the protocol buffer compiler. DO NOT EDIT! */ #ifndef PROTOBUF_C_statusapi_2eproto__INCLUDED #define PROTOBUF_C_statusapi_2eproto__INCLUDED #include <google/protobuf-c/protobuf-c.h> PROTOBUF_C_BEGIN_DECLS typedef struct _Statusapi__StatusRequestType Statusapi__StatusRequestType; typedef struct _Statusapi__StatusResponseType Statusapi__StatusResponseType; typedef struct _Statusapi__StatusParams Statusapi__StatusParams; /* — enums — */ /* — messages — */ struct _Statusapi__StatusRequestType { ProtobufCMessage base; }; #define STATUSAPI__STATUS_REQUEST_TYPE__INIT \ { PROTOBUF_C_MESSAGE_INIT (&statusapi__status_request_type__descriptor) \ } struct _Statusapi__StatusResponseType { ProtobufCMessage base; }; #define STATUSAPI__STATUS_RESPONSE_TYPE__INIT \ { PROTOBUF_C_MESSAGE_INIT (&statusapi__status_response_type__descriptor) \ } ...

There is protobuf and protobuf-c website: http://code.google.com/p/protobuf/ http://code.google.com/p/protobuf-c/ We are implementing remote control from back-end applications using protobuf-c. The protobuf-c has extensions from Google’s protobuf for RPC functionality. The first experiment is using the message directly by packing messages into shared memory between the server and the client. Both sides can get the message without issues. Our target is to use the RPC approach that protobuf-c provides. First, we create a .proto file — here’s an example statusapi.proto: ...

While organizing earlier blog posts from 2008, I notice how immature I was back then — but looking at the transitions and broader experiences since, it seems I’ve grown, even if just a little. In January 2011, just before hitting my seventh year, I made a major decision: to leave a very familiar work environment. In some ways, it meant stepping out of my comfort zone — essentially resetting myself. What guided the decision was an unexpected opportunity to work at a multinational foreign company. That opportunity matched a few things I’d been thinking about: ...