Project

General

Profile

Step-By-Step - Common Client Libraries » History » Version 16

Anonymous, 12/17/2015 03:39 PM

1 1 Anonymous
Step-By-Step - Common Client Libraries
2
======================================
3
4 2 Anonymous
This document step-by-step how to get a minimal [NFD](https://github.com/named-data/NFD) running so you can start writing applications to use the NDN [Common Client Libraries](http://named-data.net/doc/ndn-ccl-api/) ([NDN-CPP](https://github.com/named-data/ndn-cpp), [NDN-JS](https://github.com/named-data/ndn-js), [PyNDN](https://github.com/named-data/PyNDN2), [jNDN](https://github.com/named-data/jndn)).
5 1 Anonymous
6
# Prerequisites
7
8 10 Anonymous
## OS X 10.9, OS X 10.10.2, OS X 10.11
9 1 Anonymous
10
* Install Xcode.
11 7 Anonymous
* (OS X 10.8.4 only) In Xcode Preferences > Downloads, install "Command Line Tools".
12 6 Anonymous
* Install MacPorts from http://www.macports.org/install.php
13
14 7 Anonymous
In a new terminal, enter:
15 1 Anonymous
16
    sudo port install pkgconfig boost sqlite3 libcryptopp libpcap
17
18
To build NFD, we need `/usr/local/lib/pkgconfig` in the environment variable `PKG_CONFIG_PATH`, so we set it here. If you close your terminal before building NFD, you should set this again.
19
20
    export PKG_CONFIG_PATH=$PKG_CONFIG_PATH:/usr/local/lib/pkgconfig
21
22
## Ubuntu 12.04
23
24
In a terminal, enter:
25
26 11 Anonymous
    sudo apt-get install build-essential git libssl-dev libsqlite3-dev libcrypto++-dev libpcap-dev libboost1.48-all-dev
27 1 Anonymous
28 13 Anonymous
## Ubuntu 13.10, Ubuntu 14.04, Ubuntu 15.04, Raspbian Wheezy (Rapberry Pi)
29 1 Anonymous
30
In a terminal, enter:
31
32 12 Anonymous
    sudo apt-get install build-essential git libssl-dev libsqlite3-dev libcrypto++-dev libpcap-dev libboost-all-dev
33 1 Anonymous
34 16 Anonymous
### Raspbian Wheezy
35 1 Anonymous
36 3 Anonymous
To run NFD on the Raspberry Pi, you need to enable IPv6 support. Enter `sudo nano /etc/modules` (or use your favorite editor). Add the following line to `/etc/modules`:
37 1 Anonymous
38
    ipv6
39
40
Reboot your Raspberry Pi.
41
42
(If you don't want to enable IPv6 support on the Raspberry Pi, you can disable IPv6 in NFD. After installing NFD, replace `enable_v6 yes` with `enable_v6 no` in the `tcp` and `udp` sections of `/usr/local/etc/ndn/nfd.conf` .)
43
44
# Build/Install NFD
45
46
These are steps to [build/install NFD](http://named-data.net/doc/NFD/current/INSTALL.html) which works with NFD.  In a terminal, enter:
47
48 4 Anonymous
    git clone https://github.com/named-data/ndn-cxx
49
    git clone --recursive https://github.com/named-data/NFD
50 1 Anonymous
    cd ndn-cxx
51
    ./waf configure
52
53
If waf says "program doxygen not found", "program sphinx-build not found" or "library rt not found", it is OK.
54
55
    ./waf
56
    sudo ./waf install
57
    cd ..
58
    cd NFD
59
    ./waf configure
60
61
If waf says "libndn-cxx not found", then set `PKG_CONFIG_PATH` as shown in the Prerequisites above.
62
63
    ./waf
64
    sudo ./waf install
65
    cd ..
66
67
The NFD programs are installed in `/usr/local/bin` . The NFD configuration file is in `/usr/local/etc/ndn` .  Copy the sample configuration file to make it the default:
68
69
    sudo cp /usr/local/etc/ndn/nfd.conf.sample /usr/local/etc/ndn/nfd.conf
70 13 Anonymous
71
### Ubuntu
72
73 14 Anonymous
[Ubuntu only] Update the path to the shared libraries:
74 13 Anonymous
75 15 Anonymous
    sudo /sbin/ldconfig
76 1 Anonymous
77
# Configure NFD
78
79
NFD provides mechanisms to enable strict authorization for all management commands.  In particular, one can authorize only a specific public key to create new Faces or to change the strategy choice for specific namespaces.
80
For more information about how to generate a private/public key pair, generate a self-signed certificate, and use this self-signed certificate to authorize NFD management commands, refer to [NFD Configuration Tips](http://named-data.net/doc/NFD/current/README.html).
81
82
In the sample configuration file, all authorization is disabled, effectively allowing anybody on the local machine to issue NFD management commands. **The sample file is intended only for demo purposes and MUST NOT be used in a production environment.**
83
84
## Start NFD
85
86
Open a new terminal window (so you can watch the NFD messages) and enter:
87
88
    nfd-start
89
90
On OS X it may ask for your keychain password or ask "nfd wants to sign using key in your keychain." Enter your keychain password and click Always Allow.
91
92
Later, you can stop NFD with `nfd-stop` .
93
94
## Add a route to another NFD host (optional)
95
96
The previous instructions are good for testing on the local host. If you want to route an interest to another NFD host, in a terminal enter:
97
98
    nfdc register /ndn udp://<other host>
99
100
where `<other host>` is the name or IP address of the other host (e.g., `spurs.cs.ucla.edu`). The "/ndn" means that NFD will forward all interests that start with `/ndn` through the face to the other host.  If you only want to forward interests with a certain prefix then use it instead of "/ndn".
101
102
This only forwards interests to the other host, but there is no "back route" for the other host to forward interests to you. For that, you must go to the other host and use `nfdc` to add the route. (The "back route" can also be automatically configured with `nfd-autoreg`.  For more information refer to [nfd-autoreg manpage](http://named-data.net/doc/NFD/current/manpages/nfd-autoreg.html).)
103
104
# Install the Common Client Library
105
106
If you haven't done so, get the library from GitHub and follow the INSTALL instructions for your language:
107
108 5 Anonymous
* C++: [NDN-CPP](https://github.com/named-data/ndn-cpp) ([INSTALL](https://github.com/named-data/ndn-cpp/blob/master/INSTALL.md) instructions)
109
* Python: [PyNDN2](https://github.com/named-data/PyNDN2) ([INSTALL](https://github.com/named-data/PyNDN2/blob/master/INSTALL.md) instructions)
110
* JavaScript: [NDN-JS](https://github.com/named-data/ndn-js) ([INSTALL](https://github.com/named-data/ndn-js/blob/master/INSTALL) instructions)
111
* JavaScript: [jNDN](https://github.com/named-data/jndn) ([INSTALL](https://github.com/named-data/jndn/blob/master/INSTALL.md) instructions)
112 1 Anonymous
113
# Send an Interest to receive a Data packet
114
115
The example program "test get async" is a simple program to send some interests and get a data packet.  Here they are on the various languages:
116
117
* C++: [`test-get-async.cpp`](https://github.com/named-data/ndn-cpp/blob/master/tests/test-get-async.cpp)
118
* Python: [`test_get_async.py`](https://github.com/named-data/PyNDN2/blob/master/tests/test_get_async.py)
119
* JavaScript (browser): [`test-get-async.html`](https://github.com/named-data/ndn-js/blob/master/tests/browser/test-get-async.html)
120
* JavaScript (node): [`fetch.js`](https://github.com/named-data/ndn-js/blob/master/tests/node/fetch.js)
121 5 Anonymous
* Java: [`TestGetAsync.java`](https://github.com/named-data/jndn/blob/master/tests/src/net/named_data/jndn/tests/TestGetAsync.java)
122 1 Anonymous
123
The main calls to the API are (using Python for example):
124
125
Call the [Face constructor](http://named-data.net/doc/ndn-ccl-api/face.html#face-constructors) and specify the host.
126
127
    face = Face("aleph.ndn.ucla.edu")
128
129
130
Create a [Name](http://named-data.net/doc/ndn-ccl-api/name.html#name-constructor-from-uri) for the Interest, using a Name URI.
131
132
    name1 = Name("/ndn/edu/ucla/remap/ndn-js-test/howdy.txt")
133
134
Call [expressInterest](http://named-data.net/doc/ndn-ccl-api/face.html#face-expressinterest-method-from-name), passing in the callbacks for onData and onTimeout.
135
136
    face.expressInterest(name1, counter.onData, counter.onTimeout)
137
138
Start an event loop to keep calling [processEvents](http://named-data.net/doc/ndn-ccl-api/face.html#face-processevents-method) until the application is finished.
139
Your application should make sure that it calls processEvents in the same thread as expressInterest (which also modifies the pending interest table).
140
141
    while counter._callbackCount < 3:
142
        face.processEvents()
143
        # We need to sleep for a few milliseconds so we don't use 100% of the CPU.
144
        time.sleep(0.01)