dcrd/docs/README.md

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### Table of Contents
1. [About](#About)
2. [Getting Started](#GettingStarted)
1. [Installation](#Installation)
2. [Configuration](#Configuration)
3. [Controlling and Querying dcrd via dcrctl](#DcrctlConfig)
4. [Mining](#Mining)
3. [Help](#Help)
1. [Network Configuration](#NetworkConfig)
2. [Wallet](#Wallet)
4. [Contact](#Contact)
1. [Community](#ContactCommunity)
5. [Developer Resources](#DeveloperResources)
1. [Code Contribution Guidelines](#ContributionGuidelines)
2. [JSON-RPC Reference](#JSONRPCReference)
3. [Go Modules](#GoModules)
4. [Module Hierarchy](#ModuleHierarchy)
<a name="About" />
### 1. About
dcrd is a full node Decred implementation written in [Go](https://golang.org),
and is licensed under the [copyfree](http://www.copyfree.org) ISC License.
This software is currently under active development. It is extremely stable and
has been in production use since February 2016.
It also properly relays newly mined blocks, maintains a transaction pool, and
relays individual transactions that have not yet made it into a block. It
ensures all individual transactions admitted to the pool follow the rules
required into the block chain and also includes the vast majority of the more
strict checks which filter transactions based on miner requirements ("standard"
transactions).
<a name="GettingStarted" />
### 2. Getting Started
<a name="Installation" />
**2.1 Installation**<br />
The first step is to install dcrd. The installation instructions can be found
[here](https://github.com/decred/dcrd/tree/master/README.md#Installation).
<a name="Configuration" />
**2.2 Configuration**<br />
dcrd has a number of [configuration](https://godoc.org/github.com/decred/dcrd)
options, which can be viewed by running: `$ dcrd --help`.
<a name="DcrctlConfig" />
**2.3 Controlling and Querying dcrd via dcrctl**<br />
dcrctl is a command line utility that can be used to both control and query dcrd
via [RPC](https://www.wikipedia.org/wiki/Remote_procedure_call). dcrd does
**not** enable its RPC server by default; You must configure at minimum both an
RPC username and password or both an RPC limited username and password:
* dcrd.conf configuration file
```
[Application Options]
rpcuser=myuser
rpcpass=SomeDecentp4ssw0rd
rpclimituser=mylimituser
rpclimitpass=Limitedp4ssw0rd
```
* dcrctl.conf configuration file
```
[Application Options]
rpcuser=myuser
rpcpass=SomeDecentp4ssw0rd
```
OR
```
[Application Options]
rpclimituser=mylimituser
rpclimitpass=Limitedp4ssw0rd
```
For a list of available options, run: `$ dcrctl --help`
<a name="Mining" />
**2.4 Mining**<br />
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dcrd supports the [getwork](https://github.com/decred/dcrd/tree/master/docs/json_rpc_api.mediawiki#getwork)
RPC. The limited user cannot access this RPC.<br />
**1. Add the payment addresses with the `miningaddr` option.**<br />
```
[Application Options]
rpcuser=myuser
rpcpass=SomeDecentp4ssw0rd
miningaddr=DsExampleAddress1
miningaddr=DsExampleAddress2
```
**2. Add dcrd's RPC TLS certificate to system Certificate Authority list.**<br />
`cgminer` uses [curl](https://curl.haxx.se/) to fetch data from the RPC server.
Since curl validates the certificate by default, we must install the `dcrd` RPC
certificate into the default system Certificate Authority list.
**Ubuntu**<br />
1. Copy rpc.cert to /usr/share/ca-certificates: `# cp /home/user/.dcrd/rpc.cert /usr/share/ca-certificates/dcrd.crt`<br />
2. Add dcrd.crt to /etc/ca-certificates.conf: `# echo dcrd.crt >> /etc/ca-certificates.conf`<br />
3. Update the CA certificate list: `# update-ca-certificates`<br />
**3. Set your mining software url to use https.**<br />
`$ cgminer -o https://127.0.0.1:9109 -u rpcuser -p rpcpassword`
<a name="Help" />
### 3. Help
<a name="NetworkConfig" />
**3.1 Network Configuration**<br />
* [What Ports Are Used by Default?](https://github.com/decred/dcrd/tree/master/docs/default_ports.md)
* [How To Listen on Specific Interfaces](https://github.com/decred/dcrd/tree/master/docs/configure_peer_server_listen_interfaces.md)
* [How To Configure RPC Server to Listen on Specific Interfaces](https://github.com/decred/dcrd/tree/master/docs/configure_rpc_server_listen_interfaces.md)
* [Configuring dcrd with Tor](https://github.com/decred/dcrd/tree/master/docs/configuring_tor.md)
<a name="Wallet" />
**3.2 Wallet**<br />
dcrd was intentionally developed without an integrated wallet for security
reasons. Please see [dcrwallet](https://github.com/decred/dcrwallet) for more
information.
<a name="Contact" />
### 4. Contact
<a name="ContactCommunity" />
**4.1 Community**<br />
If you have any further questions you can find us at:
https://decred.org/community
<a name="DeveloperResources" />
### 5. Developer Resources
<a name="ContributionGuidelines" />
**5.1 Code Contribution Guidelines**
* [Code Contribution Guidelines](https://github.com/decred/dcrd/tree/master/docs/code_contribution_guidelines.md)
<a name="JSONRPCReference" />
**5.2 JSON-RPC Reference**
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* [JSON-RPC Reference](https://github.com/decred/dcrd/tree/master/docs/json_rpc_api.mediawiki)
* [RPC Examples](https://github.com/decred/dcrd/tree/master/docs/json_rpc_api.mediawiki#8-example-code)
<a name="GoModules" />
**5.3 Go Modules**
The following versioned modules are provided by dcrd repository:
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* [rpcclient/v4](https://github.com/decred/dcrd/tree/master/rpcclient) - Implements
a robust and easy to use Websocket-enabled Decred JSON-RPC client
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* [dcrjson/v3](https://github.com/decred/dcrd/tree/master/dcrjson) - Provides
infrastructure for working with Decred JSON-RPC APIs
* [rpc/jsonrpc/types](https://github.com/decred/dcrd/tree/master/rpc/jsonrpc/types) -
Provides concrete types via dcrjson for the chain server JSON-RPC commands,
return values, and notifications
* [wire](https://github.com/decred/dcrd/tree/master/wire) - Implements the
Decred wire protocol
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* [peer/v2](https://github.com/decred/dcrd/tree/master/peer) - Provides a common
base for creating and managing Decred network peers
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* [blockchain/v2](https://github.com/decred/dcrd/tree/master/blockchain) -
Implements Decred block handling and chain selection rules
* [stake/v2](https://github.com/decred/dcrd/tree/master/blockchain/stake) -
Provides an API for working with stake transactions and other portions
related to the Proof-of-Stake (PoS) system
* [standalone](https://github.com/decred/dcrd/tree/master/blockchain/standalone) -
Provides standalone functions useful for working with the Decred blockchain
consensus rules
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* [txscript/v2](https://github.com/decred/dcrd/tree/master/txscript) -
Implements the Decred transaction scripting language
* [dcrec](https://github.com/decred/dcrd/tree/master/dcrec) - Provides constants
for the supported cryptographic signatures supported by Decred scripts
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* [secp256k1/v2](https://github.com/decred/dcrd/tree/master/dcrec/secp256k1) -
Implements the secp256k1 elliptic curve
* [edwards/v2](https://github.com/decred/dcrd/tree/master/dcrec/edwards) -
Implements the edwards25519 twisted Edwards curve
* [database/v2](https://github.com/decred/dcrd/tree/master/database) -
Provides a database interface for the Decred block chain
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* [mempool/v3](https://github.com/decred/dcrd/tree/master/mempool) - Provides a
policy-enforced pool of unmined Decred transactions
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* [dcrutil/v2](https://github.com/decred/dcrd/tree/master/dcrutil) - Provides
Decred-specific convenience functions and types
* [chaincfg/v2](https://github.com/decred/dcrd/tree/master/chaincfg) - Defines
chain configuration parameters for the standard Decred networks and allows
callers to define their own custom Decred networks for testing puproses
* [chainhash](https://github.com/decred/dcrd/tree/master/chaincfg/chainhash) -
Provides a generic hash type and associated functions that allows the
specific hash algorithm to be abstracted
* [certgen](https://github.com/decred/dcrd/tree/master/certgen) - Provides a
function for creating a new TLS certificate key pair, typically used for
encrypting RPC and websocket communications
* [addrmgr](https://github.com/decred/dcrd/tree/master/addrmgr) - Provides a
concurrency safe Decred network address manager
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* [connmgr/v2](https://github.com/decred/dcrd/tree/master/connmgr) - Implements
a generic Decred network connection manager
* [hdkeychain/v2](https://github.com/decred/dcrd/tree/master/hdkeychain) -
Provides an API for working with Decred hierarchical deterministic extended
keys
* [gcs](https://github.com/decred/dcrd/tree/master/gcs) - Provides an API for
building and using Golomb-coded set filters useful for light clients such as
SPV wallets
* [fees](https://github.com/decred/dcrd/tree/master/fees) - Provides methods for
tracking and estimating fee rates for new transactions to be mined into the
network
* [lru](https://github.com/decred/dcrd/tree/master/lru) - Implements a generic
concurrent safe least-recently-used cache with near O(1) perf
<a name="ModuleHierarchy" />
**5.4 Module Hierarchy**
The following diagram shows an overview of the hierarchy for the modules
provided by the dcrd repository.
![Module Hierarchy](./assets/module_hierarchy.svg)