85 lines
3.8 KiB
Markdown
85 lines
3.8 KiB
Markdown
mempool
|
|
=======
|
|
|
|
[]
|
|
(https://travis-ci.org/btcsuite/btcd) [![ISC License]
|
|
(http://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
|
|
[]
|
|
(http://godoc.org/github.com/btcsuite/btcd/mempool)
|
|
|
|
Package mempool provides a policy-enforced pool of unmined bitcoin transactions.
|
|
|
|
A key responsbility of the bitcoin network is mining user-generated transactions
|
|
into blocks. In order to facilitate this, the mining process relies on having a
|
|
readily-available source of transactions to include in a block that is being
|
|
solved.
|
|
|
|
At a high level, this package satisfies that requirement by providing an
|
|
in-memory pool of fully validated transactions that can also optionally be
|
|
further filtered based upon a configurable policy.
|
|
|
|
One of the policy configuration options controls whether or not "standard"
|
|
transactions are accepted. In essence, a "standard" transaction is one that
|
|
satisfies a fairly strict set of requirements that are largley intended to help
|
|
provide fair use of the system to all users. It is important to note that what
|
|
is considered a "standard" transaction changes over time. For some insight, at
|
|
the time of this writing, an example of _some_ of the criteria that are required
|
|
for a transaction to be considered standard are that it is of the most-recently
|
|
supported version, finalized, does not exceed a specific size, and only consists
|
|
of specific script forms.
|
|
|
|
Since this package does not deal with other bitcoin specifics such as network
|
|
communication and transaction relay, it returns a list of transactions that were
|
|
accepted which gives the caller a high level of flexibility in how they want to
|
|
proceed. Typically, this will involve things such as relaying the transactions
|
|
to other peers on the network and notifying the mining process that new
|
|
transactions are available.
|
|
|
|
This package has intentionally been designed so it can be used as a standalone
|
|
package for any projects needing the ability create an in-memory pool of bitcoin
|
|
transactions that are not only valid by consensus rules, but also adhere to a
|
|
configurable policy.
|
|
|
|
## Feature Overview
|
|
|
|
The following is a quick overview of the major features. It is not intended to
|
|
be an exhaustive list.
|
|
|
|
- Maintain a pool of fully validated transactions
|
|
- Reject non-fully-spent duplicate transactions
|
|
- Reject coinbase transactions
|
|
- Reject double spends (both from the chain and other transactions in pool)
|
|
- Reject invalid transactions according to the network consensus rules
|
|
- Full script execution and validation with signature cache support
|
|
- Individual transaction query support
|
|
- Orphan transaction support (transactions that spend from unknown outputs)
|
|
- Configurable limits (see transaction acceptance policy)
|
|
- Automatic addition of orphan transactions that are no longer orphans as new
|
|
transactions are added to the pool
|
|
- Individual orphan transaction query support
|
|
- Configurable transaction acceptance policy
|
|
- Option to accept or reject standard transactions
|
|
- Option to accept or reject transactions based on priority calculations
|
|
- Rate limiting of low-fee and free transactions
|
|
- Non-zero fee threshold
|
|
- Max signature operations per transaction
|
|
- Max orphan transaction size
|
|
- Max number of orphan transactions allowed
|
|
- Additional metadata tracking for each transaction
|
|
- Timestamp when the transaction was added to the pool
|
|
- Most recent block height when the transaction was added to the pool
|
|
- The fee the transaction pays
|
|
- The starting priority for the transaction
|
|
- Manual control of transaction removal
|
|
- Recursive removal of all dependent transactions
|
|
|
|
## Installation and Updating
|
|
|
|
```bash
|
|
$ go get -u github.com/btcsuite/btcd/mempool
|
|
```
|
|
|
|
## License
|
|
|
|
Package mempool is licensed under the [copyfree](http://copyfree.org) ISC
|
|
License.
|