From 529256a372e7dd324ba1f14b3c13afd814741734 Mon Sep 17 00:00:00 2001 From: mDuo13 Date: Wed, 8 Jul 2015 19:19:28 -0700 Subject: [PATCH] [DOC] draft ledger format page --- charts-api-tool.html | 9 +- charts_api.html | 9 +- content/ledger_format.md | 192 +++++++++++++++++++++++++++++++++++++ gateway_guide.html | 9 +- gateway_services.html | 9 +- historical_data.html | 9 +- historicaldb-api-tool.html | 9 +- index.html | 9 +- reliable_tx.html | 9 +- rest-api-tool.html | 9 +- ripple-api-tool.html | 10 +- ripple-ledger.html | 185 +++++++++++++++++++++++++++++++++++ ripple-rest.html | 9 +- rippled-apis.html | 9 +- rippled-setup.html | 9 +- tool/pages.json | 10 +- transactions.html | 9 +- transfer_fees.html | 9 +- whitepapers.html | 9 +- 19 files changed, 494 insertions(+), 38 deletions(-) create mode 100644 content/ledger_format.md create mode 100644 ripple-ledger.html diff --git a/charts-api-tool.html b/charts-api-tool.html index 7b9fc292ef..63335becbc 100644 --- a/charts-api-tool.html +++ b/charts-api-tool.html @@ -50,8 +50,8 @@
  • rippled
  • rippled Setup
  • Ripple-REST
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  • Gatewayd
  • Transactions
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  • The Ledger
  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
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  • rippled
  • rippled Setup
  • Ripple-REST
    • -
  • Gatewayd
  • Transactions
    • +
  • The Ledger
  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
    • diff --git a/charts_api.html b/charts_api.html index fec0b8bdd2..af9939a93c 100644 --- a/charts_api.html +++ b/charts_api.html @@ -77,8 +77,8 @@
  • rippled
  • rippled Setup
  • Ripple-REST
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  • Gatewayd
  • Transactions
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  • The Ledger
  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
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  • rippled
  • rippled Setup
  • Ripple-REST
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  • Gatewayd
  • Transactions
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  • The Ledger
  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
    • diff --git a/content/ledger_format.md b/content/ledger_format.md new file mode 100644 index 0000000000..42edbd3c5d --- /dev/null +++ b/content/ledger_format.md @@ -0,0 +1,192 @@ +# The Ledger # + +The point of the Ripple software is to maintain a shared, global ledger that is open to all, so that individual participants can trust the integrity of the ledger without having to trust any single institution to manage it. The `rippled` server software accomplishes this by maintaining a ledger database that can only be updated according to very specific rules. Each instance of `rippled` maintains a full copy of the ledger, and the peer-to-peer network of `rippled` servers distributes candidate transactions, where [the consensus process](https://ripple.com/knowledge_center/the-ripple-ledger-consensus-process/) determines which transactions get applied to each new version of the ledger. + +The shared global ledger is actually a series of individual ledgers, or ledger versions, which `rippled` keeps in its internal database. Every ledger version has a sequence number, starting at 0 and incrementing with each new version. Every closed ledger also has an identifying hash value, which uniquely identifies the contents of that ledger. At any given time, a `rippled` instance has an in-progress "current" open ledger, plus some number of closed ledgers that have not yet been approved by consensus, and any number of historical ledgers that have been validated by consensus. Only the validated ledgers are certain to be accurate and immutable. + +A single ledger version consists of: + +* A **header** - The sequence number, hashes of the other contents, and other metadata. +* A **transaction tree** - The [transactions](transactions.html) that were applied to the previous ledger to make this one. Transactions are the _only_ way to modify the ledger. +* A **state tree** - A full record of the settings, balances, and objects contained in the ledger as of this version +* A **collection of signatures** - (where? what?) + +## Tree Format ## + +As its name might suggest, the state tree is a tree data structure, with each node identified by a 256-bit hash value called an `index`. In JSON, these 256-bit hash values are represented as 64-character hexadecimal strings like `"193C591BF62482468422313F9D3274B5927CA80B4DD3707E42015DD609E39C94"`. Every node in the state tree has an index that you can use to look up the node; every transaction has an indentifying hash that you can use to look up the transaction in the transaction tree. + +In the case of transactions, the identifying hash is based on the signed transaction instructions, but the contents of the transaction object when you look it up also contain the results and metadata of the transaction, which are not taken into account when generating the hash. + +# Ledger Node Types # + +There are several different kinds of nodes that can appear in the ledger's state tree: + +* [**AccountRoot** - The settings, XRP balance, and other metadata for one account.](#accountroot) +* [**DirectoryNode** - Contains a bunch of links to other nodes.](#directorynode) +* [**Offer** - An offer to exchange currencies, known in finance as an _order_.](#offer) +* [**RippleState** - Links two accounts, tracking the balance of one currency between them. The concept of a _trust line_ is really an abstraction of this node type.](#ripplestate) + +Each ledger node consists of several fields. In the peer protocol that `rippled` nodes use to communicate with each other, ledger nodes are represented in their raw binary format. In other [`rippled` APIs](rippled-apis.html), nodes are represented as JSON objects. + +## AccountRoot ## + +The `AccountRoot` node type describes a single _account_ object. The `AccountRoot` node has the following fields: + +| Field | JSON Type | [Internal Type](https://wiki.ripple.com/Binary_Format) | Description | +|-----------------|-----------|---------------|-------------| +| LedgerEntryType | String | UInt16 | The value `0x61`, mapped to the string `AccountRoot`, indicates that this node is an AccountRoot object. | +| Account | String | AccountID | The identifying address of this account, such as rf1BiGeXwwQoi8Z2ueFYTEXSwuJYfV2Jpn. | +| [Flags](#accountroot-flags) | Number | UInt32 | A bit-map of boolean flags enabled for this account. | +| Sequence | Number | UInt32 | The sequence number of the next valid transaction for this account. (Each account starts with Sequence = 1 and increases each time a transaction is made.) | +| Balance | String | Amount | The account's current XRP balance in drops, represented as a string. | +| OwnerCount | Number | UInt32 | The number of objects this account owns in the ledger, which contributes to its owner reserve. | +| RegularKey | String | AccountID | (Optional) The address of a keypair that can be used to sign transactions for this account instead of the master key. Use a [SetRegularKey transaction](transactions.html#setregularkey) to change this value. | +| EmailHash | String | Hash128 | (Optional) The md5 hash of an email address. Clients can use this to look up an avatar through services such as [Gravatar](https://en.gravatar.com/). | +| WalletLocator | String | Hash256 | (Optional) **DEPRECATED**. Do not use. | +| WalletSize | Number | UInt32 | (Optional) **DEPRECATED**. Do not use. | +| MessageKey | String | PubKey | (Optional) A public key that may be used to send encrypted messages to this account. In JSON, uses hexadecimal. (bit size?) | +| TransferRate | Number | UInt32 | (Optional) A [transfer fee](https://ripple.com/knowledge_center/transfer-fees/) to charge other users for sending currency issued by this account to each other. | +| Domain | String | VariableLength | (Optional) A domain associated with this account. In JSON, this is the hexadecimal for the ASCII representation of the domain. | + +### AccountRoot Flags ### + +There are several options which can be either enabled or disabled for an account. These options can be changed with an [AccountSet transaction](transactions.html#accountset). In the ledger, flags are represented as binary values that can be combined with bitwise-or operations. The bit values for the flags in the ledger are different than the values used to enable or disable those flags in a transaction. Ledger flags have names that begin with _lsf_. + +AccountRoot nodes can have the following flag values: + +| Flag Name | Hex Value | Decimal Value | Description | Corresponding [AccountSet Flag](transactions.html#accountset-flags) | +|-----------|-----------|---------------|-------------|-------------------------------| +| lsfPasswordSpent | 0x00010000 | 65536 | Indicates that the account has used its free SetRegularKey transaction. | (None) | +| lsfRequireDestTag | 0x00020000 | 131072 | Requires incoming payments to specify a Destination Tag. | asfRequireDest | +| lsfRequireAuth | 0x00040000 | 262144 | This account must individually approve other users in order for those users to hold this account's issuances. | asfRequireAuth | +| lsfDisallowXRP | 0x00080000 | 524288 | Client applications should not send XRP to this account. Not enforced by `rippled`. | asfDisallowXRP | +| lsfDisableMaster | 0x00100000 | 1048576 | Disallows use of the master key to sign transactions for this account. | asfDisableMaster | +| lsfNoFreeze | 0x00200000 | 209715　| This account cannot freeze trust lines connected to it. Once enabled, cannot be disabled. | asfNoFreeze | +| lsfGlobalFreeze | 0x00400000 | 4194304 |　All assets issued by this account are frozen. | asfGlobalFreeze | +| lsfDefaultRipple | 0x00800000 | 8388608 | Enable [rippling](https://ripple.com/knowledge_center/understanding-the-noripple-flag/) on this account's trust lines by default. Required for gateways; discouraged for other accounts. | + +## DirectoryNode ## + +The `DirectoryNode` node type provides a list of links to other nodes in the ledger's state tree. A single conceptual _Directory_　takes the form of a doubly linked list, with one or more DirectoryNode objects each containing up to 32 [indexes](#tree-format) of other nodes. The first node is called the root of the directory, and all nodes other than the root node can be added or deleted as necessary. + +There are two kinds of Directories: + +* **Owner directories** list other nodes owned by an account, such as RippleState or Offer nodes. +* **Offer directories** list the offers currently available in the distributed exchange, grouped by exchange rate. + +Example Directories: + +
    + +*Offer Directory* + +``` +{ + "ExchangeRate": "4F069BA8FF484000", + "Flags": 0, + "Indexes": [ + "AD7EAE148287EF12D213A251015F86E6D4BD34B3C4A0A1ED9A17198373F908AD" + ], + "LedgerEntryType": "DirectoryNode", + "RootIndex": "1BBEF97EDE88D40CEE2ADE6FEF121166AFE80D99EBADB01A4F069BA8FF484000", + "TakerGetsCurrency": "0000000000000000000000000000000000000000", + "TakerGetsIssuer": "0000000000000000000000000000000000000000", + "TakerPaysCurrency": "0000000000000000000000004A50590000000000", + "TakerPaysIssuer": "5BBC0F22F61D9224A110650CFE21CC0C4BE13098", + "index": "1BBEF97EDE88D40CEE2ADE6FEF121166AFE80D99EBADB01A4F069BA8FF484000" +} +``` + +*Owner Directory* + +``` +{ + "Flags": 0, + "Indexes": [ + "AD7EAE148287EF12D213A251015F86E6D4BD34B3C4A0A1ED9A17198373F908AD", + "E83BBB58949A8303DF07172B16FB8EFBA66B9191F3836EC27A4568ED5997BAC5" + ], + "LedgerEntryType": "DirectoryNode", + "Owner": "rpR95n1iFkTqpoy1e878f4Z1pVHVtWKMNQ", + "RootIndex": "193C591BF62482468422313F9D3274B5927CA80B4DD3707E42015DD609E39C94", + "index": "193C591BF62482468422313F9D3274B5927CA80B4DD3707E42015DD609E39C94" +} +``` + +
    + +| Name | JSON Type | [Internal Type](https://wiki.ripple.com/Binary_Format) | Description | +|-------------------|-----------|---------------|-------------| +| LedgerEntryType | Number | UInt16 | The value `0x64`, mapped to the string `DirectoryNode`, indicates that this node is part of a Directory. | +| Flags | Number | UInt32 | A bit-map of boolean flags enabled for this directory. | +| RootIndex | Number | Hash256 | The index of root node for this directory. | +| Indexes | Array | Vector256 | The contents of this Directory: an array of indexes to other nodes. | +| IndexNext | Number | UInt64 | (Optional) If this Directory consists of multiple nodes, this index links to the next node in the chain, wrapping around at the end. | +| IndexPrevious | Number | UInt64 | (Optional) If this Directory consists of multiple nodes, this index links to the previous node in the chain, wrapping around at the beginning. | +| Owner | String | AccountID | (Owner Directories only) The address of the account that owns the objects in this directory. | +| ExchangeRate | Number | UInt64 | (Offer Directories only) **DEPRECATED**. Do not use. | +| TakerPaysCurrency | String | Hash160 | (Offer Directories only) The currency code of the TakerPays amount from the offers in this directory. | +| TakerPaysIssuer | String | Hash160 | (Offer Directories only) The issuer of the TakerPays amount from the offers in this directory. | +| TakerGetsCurrency | String | Hash160 | (Offer Directories only) The currency code of the TakerGets amount from the offers in this directory. | +| TakerGetsIssuer | String | Hash160 | (Offer Directories only) The issuer of the TakerGets amount from the offers in this directory. | + +## Offer ## + +The `Offer` node type describes an offer to exchange currencies, more traditionally known as an _order_, which is currently in an order book in Ripple's distributed exchange. An [OfferCreate transaction](transactions.html#offercreate) only creates an Offer node in the ledger when the offer cannot be fully executed immediately by consuming other offers already in the ledger. + +An offer can become unfunded through other activities in the network, while remaining in the ledger. However, `rippled` will automatically prune any unfunded offers it happens across in the course of transaction processing. For more information, see [lifecycle of an offer](transactions.html#lifecycle-of-an-offer). + +| Name | JSON Type | [Internal Type](https://wiki.ripple.com/Binary_Format) | Description | +|-------------------|-----------|---------------|-------------| +| LedgerEntryType | String | UInt16 | The value `0x6F`, mapped to the string `Offer`, indicates that this node is an Offer object. | +| Flags | Number | UInt32 | A bit-map of boolean flags enabled for this offer. | +| Account | String | AccountID | The address of the account that owns this offer. | +| Sequence | Number | UInt32 | The `Sequence` value of the [OfferCreate](transactions.html#offercreate) transaction that created this Offer node. Used in combination with the `Account` to identify this Offer. | +| TakerPays | String or Object | Amount | The remaining amount and type of currency requested by the offer creator. | +| TakerGets | String or Object | Amount | The remaining amount and type of currency being provided by the offer creator. | +| BookDirectory | String | UInt256 | The index of the [Offer Directory](#directorynode) that links to this offer. | +| BookNode | String | UInt64 | A hint indicating which which page of the offer directory links to this node, in case the directory consists of multiple nodes. | +| OwnerNode | String | UInt64 | A hint indicating which which page of the owner directory links to this node, in case the directory consists of multiple nodes. **Note:** The offer does not contain a direct link to the owner directory containing it, since that value can be derived from the `Account`. | +| Expiration | Number | UInt32 | (Optional) Indicates the time after which this offer will be considered unfunded. See [Specifying Time](rippled-apis.html#specifying-time) for details. | + + +## RippleState ## + +The `RippleState` node type connects two accounts in a single currency. Conceptually, a RippleState node represents two _trust lines_ between the accounts, one from each side. Each account can modify the settings for its side of the RippleState node, but the balance is a single shared value. A RippleState node that is entirely in its default state is considered the same as a RippleState node that does not exist, so `rippled` deletes RippleState nodes when their properties are entirely default. + +Since no account is privileged in the Ripple ledger, a RippleState node identifies the two parties by numerically comparing their account addresses. Whichever address is numerically lower is deemed the "low node" and the other is the "high node". + +| Name | JSON Type | Internal Type | Description | +|-----------------|-----------|---------------|-------------| +| LedgerEntryType | String | UInt16 | The value `0x72`, mapped to the string `RippleState`, indicates that this node is a RippleState object. | +| Flags | Number | UInt32 | A bit-map of boolean options enabled for this node. | +| Balance | Object | Amount | The balance of the trust line, from the perspective of the low node. A negative balance indicates that the low node has issued currency to the high node. The issuer in this is always set to the neutral value [ACCOUNT_ONE](https://wiki.ripple.com/Accounts#ACCOUNT_ONE). | +| LowLimit | Object | Amount | The limit that the low node has set on the trust line. The `issuer` is the address of the low node that set this limit. | +| HighLimit | Object | Amount | The limit that the high node has set on the trust line. The `issuer` is the address of the high node that set this limit. | +| LowNode | String | UInt64 | (Omitted in some historical ledgers) A hint indicating which which page of the low node's owner directory links to this node, in case the directory consists of multiple nodes. | +| HighNode | String | UInt64 | (Omitted in some historical ledgers) A hint indicating which which page of the high node's owner directory links to this node, in case the directory consists of multiple nodes. | +| LowQualityIn | Number | UInt32 | (Optional) The inbound quality set by the low node, as an integer in the implied ratio LowQualityIn:1,000,000,000. The value 0 is equivalent to 1 billion, or no fee. | +| LowQualityOut | Number | UInt32 | (Optional) The outbound quality set by the low node, as an integer in the implied ratio LowQualityOut:1,000,000,000. The value 0 is equivalent to 1 billion, or no fee. | +| HighQualityIn | Number | UInt32 | (Optional) The inbound quality set by the high node, as an integer in the implied ratio HighQualityIn:1,000,000,000. The value 0 is equivalent to 1 billion, or no fee. | +| HighQualityOut | Number | UInt32 | (Optional) The outbound quality set by the high node, as an integer in the implied ratio HighQualityOut:1,000,000,000. The value 0 is equivalent to 1 billion, or no fee. | + +### Contributing to the Owner Reserve ### + +If an account modifies a trust line to put it in a non-default state, then that trust line counts towards the account's owner reserve. In a RippleState node, the `lsfLowReserve` and `lsfHighReserve` flags indicate which node(s) are responsible for the owner reserve. The `rippled` server automatically sets these flags when it modifies a trust line. + +The values that count towards a a trust line's non-default state are as follows: + +| High Node Responsible | Low Node Responsible | +|-----------------------|----------------------| +| If `Balance` is negative (the high node holds currency) | If `Balance` is positive (the low node holds currency) | +| HighLimit is not `0` | LowLimit is not `0` | +| LowQualityIn is not `0` and not `1000000000` | HighQualityIn is not `0` and not `1000000000` | +| LowQualityOut is not `0` and not `1000000000` | HighQualityOut is not `0` and not `1000000000` | +| lsfHighNoRipple flag is not in its default state | lsfLowNoRipple is not in its default state | +| lsfHighFreeze is enabled | lsfLowFreeze is enabled | + +The lsfLowAuth and lsfHighAuth flags do not count towards the default state, because they cannot be disabled. + +The default state of the two NoRipple flags depends on the state of the [lsfDefaultRipple flag](#accountroot-flags) in their corresponding AccountRoot nodes. If DefaultRipple is disabled (the default), then the default state of the lsfNoRipple flag is _enabled_ for all of an account's trust lines. If an account enables DefaultRipple, then the lsfNoRipple flag is _disabled_ (rippling is enabled) for an account's trust lines by default. **Note:** Prior to the introduction of the DefaultRipple flags in `rippled` version 0.27.3 (March 10, 2015), the default state for all trust lines was with lsfNoRipple disabled (rippling enabled). + +Fortunately, `rippled` uses lazy evaluation to calculate the owner reserve. This means that even if an account changes the default state of all its trust lines by changing the DefaultRipple flag, that account's reserve stays the same initially. Later, if the account modifies a trust line, the owner reserve will apply if the changes put it into a non-default state. diff --git a/gateway_guide.html b/gateway_guide.html index 38771a65f3..c30aa3cf2f 100644 --- a/gateway_guide.html +++ b/gateway_guide.html @@ -77,8 +77,8 @@
  • rippled
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    • diff --git a/rippled-apis.html b/rippled-apis.html index 8ff24790f8..1c452cbf56 100644 --- a/rippled-apis.html +++ b/rippled-apis.html @@ -77,8 +77,8 @@
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    • -
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    • +
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  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
    • @@ -112,6 +112,11 @@
    +
    @@ -131,8 +136,8 @@
  • rippled
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  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API
    • diff --git a/rippled-setup.html b/rippled-setup.html index d84ecd210c..25d121cf6c 100644 --- a/rippled-setup.html +++ b/rippled-setup.html @@ -77,8 +77,8 @@
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    • -
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  • Reliable Transaction Submission
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    • @@ -112,6 +112,11 @@
    +
    @@ -131,8 +136,8 @@
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    • diff --git a/tool/pages.json b/tool/pages.json index 720c4bac90..42d1aafd70 100644 --- a/tool/pages.json +++ b/tool/pages.json @@ -14,16 +14,16 @@ "md": "ripplerest_api.md", "html": "ripple-rest.html" }, - { - "name": "Gatewayd", - "md":"gatewayd.md", - "html":"gatewayd.html" - }, { "name": "Transactions", "md":"tx_format.md", "html":"transactions.html" }, + { + "name": "The Ledger", + "md":"ledger_format.md", + "html":"ripple-ledger.html" + }, { "name": "Reliable Transaction Submission", "md":"reliable_tx.md", diff --git a/transactions.html b/transactions.html index df63450cc8..e1952f4e09 100644 --- a/transactions.html +++ b/transactions.html @@ -77,8 +77,8 @@
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    • @@ -112,6 +112,11 @@
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    • @@ -112,6 +112,11 @@
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    • diff --git a/whitepapers.html b/whitepapers.html index b40468350f..336e7f7666 100644 --- a/whitepapers.html +++ b/whitepapers.html @@ -77,8 +77,8 @@
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    • @@ -112,6 +112,11 @@
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    • -
  • Gatewayd
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    • +
  • The Ledger
  • Reliable Transaction Submission
  • Gateway Guide
  • Historical Data API