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(Blocklist.size ()-1);This.addblock (Block.newblock (Previousblock.gethash (), data));} /** @param block block*/public void Addblock (block block) {This.blockList.add (block);}Genesis Block Before adding chunks, the blockchain must have a creation block, adding a new Genesis block method to the block:/** @return*/public static Block Newgenesisblock () {Return
execute the Eosiod, in the process of execution may produce an error, if there is no error, you can use CTRL + C to stop eosiod operation, at this time we can see a eosiod folder named Data-dir folder, It contains related configuration information for eosiod. Open Config.ini to add the following: # Load The Testnet Genesis State, which creates some initial blocks producers with the default key Genesis-jso
{ blocks []*block } This is our first block chain. I never thought it would be so easy. Now, let's add a block to it: Func (BC *blockchain) addblock (data string) { Prevblock: = Bc.blocks[len (Bc.blocks)-1] Newblock: = Newblock ( Data, Prevblock.hash) bc.blocks = append (Bc.blocks, newblock) } Complete. But is that really the case? In order to add a new block, we have to have an existing block, but now our chain is empty, not one block. So, in any block chain, there must be at
EOS. IO resources:https://eos.io/resources/ Eos. IO Wiki:https://github.com/eosio/eos/wiki To the Nodes directory CD build/programs/nodeos/ mkdir data-dir config-dir CP. /.. /genesis.json config-dir/ CP. /.. /.. /.. /config.ini config-dir/ Here is not a detailed introduction, you can go to see an introduction A little bit more config.ini. # Track only transactions whose scopes involve the listed accounts. The Default is to track all transactions. (eosio::account_history_plugin) # filter_on_
noun Block Chain: Block chain Utxo:unspent Transaction output, non-spent trade outputs Genesis BLOCK: Blocks 0, Genesis block Spv:simplified Payment Verification, simple payment verification Bip:bitcoin improvement proposal, Bitcoin improvement proposal Proof of work: proof of workload block Chain The blockchain provides a public account of Bitcoin, an orderly, time-stamped transaction (transaction) record
will become incorrect. Do not understand the words, slowly digest, can refer to {% post_link WHATBC block chain accounting principle%}Join the dealNext we need to add a deal to refine the next New_transaction methodclass Blockchain(object): ... def new_transaction(self, sender, recipient, amount): """ 生成新交易信息，信息将加入到下一个待挖的区块中 :param sender: The Add method adds a transaction to the list and returns the index of the chunk (the next chunk to be mined) that the record will
block via hash. In Golang, this structure can be implemented by an array and a map: array stores ordered hashes (Golang array is ordered), map storage Hask-> block pair (Golang, map is disordered). But in the basic prototype phase, we only use array, because we do not need to get the block by hash now. Type blockchain struct { blocks []*block } 1 2 3 This is our first block chain. I never thought it would be so easy.Now, let's
BIGCHAINDB Source Analysis (i) Analysis of how bigchaindb parsing command-line parameters and configuration files, and accordingly started the log Publisher and Subscriber. For the bigchaindb Start command, the _run_init is invoked to initialize the back-end storage, followed by pipeline to initiate processes such as block\vote (BIGCHAINDB source Analysis (ii)). This section describes the Bigchaindb back-end storage. _run_init is called by Run_start, and the code is located in commands/bigchaind
receiving the transaction. The general Ethereum node can also be connected to POA Chain, which normally initiates transactions, contracts and so on. This text is basically written according to the parity Demo PoA Tutorial. Parity is a performance-focused Ethereum client-side software 1. Install parity (1.5.0 or later) Please install it on your own parity website, support UBUTNU, OSX, Docker, Windows 2. Set Chain spec PoA chain need to set up a Genesis
states of a monitored object. Nagios passes the thresholds for warting and crtical to the plug-in and is responsible for monitoring and analyzing the results of a specific object by the plug-in, with output information such as status information (Ok,warning,critical or Unkown) and additional detailed information.Second, the environmentSystem: CentOS 6.4x64 Minimized installationnagios-server:192.168.3.71nagios-client:192.168.3.72Iii. installation of NagiosNagios is typically comprised of a main
is very simple, so you only need to use the following code: { "targets": [ { "target_name": "stdstring", "sources": [ "addon.cc", "stdstring.cc" ] } ] } Target_name can be set to anything you like. The sources array contains all the source files required by the plug-in. Our instance also includes addon. cc, which is used to accommodate the Code required for compiling plug-ins and stdstring. cc, and our encapsulation class. S
the status after the change is the software status. Once the test is complete, the status becomes hard. Ii. install and configure Nagios 1. About Nagios Nagios generally consists of a main program (Nagios), a plug-in program (Nagios-plugins), and four optional ADDON (NRPE, NSCA, NSClient ++, and NDOUtils. Nagios monitoring is implemented through plug-ins. Therefore, Nagios and Nagios-plugins are necessary components for server work. Among the four
support GUI. The recommended installation is vim-gnome.APT Search package:$ Apt-cache Search Package_nameAPT installation package:$ apt-get Install Vim-gnomeWhen the installation is complete, the VI command points to vim.gnome.2. Installing CtagsCtags is used to support taglist, and ctags can be used to jump between variables.$ apt-get Install Ctags3. Installing TagListFirst install vim-scripts,vim-scripts with Vim-addon-manager,vim-
sources array contains all the source files required by the plug-in. Our instance also includes addon. cc, which is used to accommodate the Code required for compiling plug-ins and stdstring. cc, and our encapsulation class. STDStringWrapper class The first step is to define our own class in the stdstring. h file. If you are familiar with C ++ programming, you will not be unfamiliar with the following two lines of code. #ifndef STDSTRING_H #define ST
The reason to write this blog post, because I usually use selenium this component, about the Browser tab management This problem I have a great headache, and has not been a good solution. Selenium this component is very powerful, but it's this browser window management mechanism Let it in my mind directly from 100 points to 80. Because of this problem, I learned today in the Firefox addon using the socket to listen to my Java request, and then by myse
1. Introduction to nagios plug-ins 1. nagios is an open-source network monitoring software that can be used to monitor host, service, and other objects. nagios can change the image status according to the monitoring changes, for the notification administrator, of course, you can select the alarm method (E-mai, SMS (that is, SMS Service) 2nagios usually has a main program, a plug-in program nagios-plug First,Introduction to nagios plug-ins 1. nagios is an open-source network monitoring software t
, HttpWatchData analysis tool, header message Accept/Send view, post Data View. Wait a minute.Http://www.httpwatch.comVI, IE Developer Toolsbarfirebug.html and CSS Debugging tools under IEhttp://www.windowsmarketplace.com/details.aspx?itemid=2695980Seven, Companion.jsJavaScript debugging Tools under IE. the Gospel!Http://www.my-debugbar.com/wiki/CompanioNJS/HomePageEight, FireBugStrong no words have been .... If you don't know what this is .... Then I have nothing more to say ....https://addons.
First install flash Player Plug-in under Ubuntu7.10, in the terminal input: sudoapt-getinstallflashplugin-nonfree download installation: tar-zxvfinstall_flash_player_9_linux.tar.gzcdinstall_flash_player_9_linux/sudo./flashplayer-installerFirefo First, install the flash Player Plug-in under Ubuntu7.10 and enter sudo apt-get install flashplugin-nonfree on the terminal. Download and install: Tar-zxvf install_flash_player_9_linux.tar.gz Cd install_flash_player_9_linux/ Sudo./flashplayer-installer Co
description of the network structure, and the ability to distinguish between "down" and "host inaccessible" 6) notify the administrator of the changes in the working status of the host or service by email or user-defined means 7) automatic Log rolling (8) support for host monitoring in redundancy mode (9) allows you to visually view the current network status, notification and problem history, log files, and so on through the web. This component is optional. Nagios generally consists of a main
This article describes how to use multi-thread programming in nodejs. in this article, nodejsaddon is used to expand nodejs multi-thread programming with cc ++, for more information about Node. js, see the previous blog post. in implementing sleep in Node. js, I will introduce the usage of Node. js addon. Today's topic is addon. continue to explore the capabilities of c/c ++ to make up for Node. js weakness
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