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c7ef4c9783
SOCI is the C++ database access library. The SOCI recipe was updated in
Conan Center Index (CCI), and it breaks for our choice of options. This
breakage occurs when you build with a fresh Conan cache (e.g. when you
submit a PR, or delete `~/.conan/data`).
* Add a custom Conan recipe for SOCI v4.0.3
* Update dependency building to handle exporting and installing Snappy
and SOCI
* Fix workflows to use custom SOCI recipe
* Update BUILD.md to include instruction for exporting the SOCI Conan
recipe:
* `conan export external/soci soci/4.0.3@`
This solution has been verified on Ubuntu 20.04 and macOS.
Context:
* There is a compiler error that the `sqlite3.h` header is not available
when building soci.
* When package B depends on package A, it finds the pieces it needs by
importing the Package Configuration File (PCF) that Conan generates
for package A.
* Read the CMake written by package B to check that it is importing
the PCF correctly and linking its exports correctly.
* Since this can be difficult, it is often more efficient to check
https://github.com/conan-io/conan-center-index/issues for package B
to see if anyone else has seen a similar problem.
* One of the issues points to a problem area in soci's CMake. To
confirm the diagnosis, review soci's CMake (after any patches are
applied) in the Conan build directory `build/$buildId/src/`.
* Review the Conan-generated PCF in
`build/$buildId/build/$buildType/generators/`.
* In this case, the problem was likely (re)introduced by
https://github.com/conan-io/conan-center-index/pull/17026
* If there is a problem in the source or in the Conan recipe, the
fastest fix is to copy the recipe and either:
* Add a source patch to fix any problems in the source.
* Change the recipe to fix any problems in the recipe.
* In this case, this can be done by finding soci's Conan recipe at
https://github.com/conan-io/conan-center-index/tree/master/recipes/soci
and then copying the `all` directory as `external/$packageName` in our
project. Then, make any changes.
* Test packages can be removed from the recipe folder as they are not
needed.
* If adding a patch in the `patches` directory, add a description for
it to `conandata.yml`.
* Since `conanfile.py` has no `version` property on the recipe class,
builders need to pass a version on the command line (like they do
for our `snappy` recipe).
* Add an example command to `BUILD.md`.
Future work: It may make sense to refer to recipes by revision, by
checking in a lockfile.
The XRP Ledger
The XRP Ledger is a decentralized cryptographic ledger powered by a network of peer-to-peer nodes. The XRP Ledger uses a novel Byzantine Fault Tolerant consensus algorithm to settle and record transactions in a secure distributed database without a central operator.
XRP
XRP is a public, counterparty-free asset native to the XRP Ledger, and is designed to bridge the many different currencies in use worldwide. XRP is traded on the open-market and is available for anyone to access. The XRP Ledger was created in 2012 with a finite supply of 100 billion units of XRP.
rippled
The server software that powers the XRP Ledger is called rippled and is available in this repository under the permissive ISC open-source license. The rippled server software is written primarily in C++ and runs on a variety of platforms. The rippled server software can run in several modes depending on its configuration.
Build from Source
Key Features of the XRP Ledger
- Censorship-Resistant Transaction Processing: No single party decides which transactions succeed or fail, and no one can "roll back" a transaction after it completes. As long as those who choose to participate in the network keep it healthy, they can settle transactions in seconds.
- Fast, Efficient Consensus Algorithm: The XRP Ledger's consensus algorithm settles transactions in 4 to 5 seconds, processing at a throughput of up to 1500 transactions per second. These properties put XRP at least an order of magnitude ahead of other top digital assets.
- Finite XRP Supply: When the XRP Ledger began, 100 billion XRP were created, and no more XRP will ever be created. The available supply of XRP decreases slowly over time as small amounts are destroyed to pay transaction costs.
- Responsible Software Governance: A team of full-time, world-class developers at Ripple maintain and continually improve the XRP Ledger's underlying software with contributions from the open-source community. Ripple acts as a steward for the technology and an advocate for its interests, and builds constructive relationships with governments and financial institutions worldwide.
- Secure, Adaptable Cryptography: The XRP Ledger relies on industry standard digital signature systems like ECDSA (the same scheme used by Bitcoin) but also supports modern, efficient algorithms like Ed25519. The extensible nature of the XRP Ledger's software makes it possible to add and disable algorithms as the state of the art in cryptography advances.
- Modern Features for Smart Contracts: Features like Escrow, Checks, and Payment Channels support cutting-edge financial applications including the Interledger Protocol. This toolbox of advanced features comes with safety features like a process for amending the network and separate checks against invariant constraints.
- On-Ledger Decentralized Exchange: In addition to all the features that make XRP useful on its own, the XRP Ledger also has a fully-functional accounting system for tracking and trading obligations denominated in any way users want, and an exchange built into the protocol. The XRP Ledger can settle long, cross-currency payment paths and exchanges of multiple currencies in atomic transactions, bridging gaps of trust with XRP.
Source Code
Here are some good places to start learning the source code:
- Read the markdown files in the source tree:
src/ripple/**/*.md. - Read the levelization document to get an idea of the internal dependency graph.
- In the big picture, the
mainfunction constructs anApplicationImpobject, which implements theApplicationvirtual interface. Almost every component in the application takes anApplication¶meter in its constructor, typically namedappand stored as a member variableapp_. This allows most components to depend on any other component.
Repository Contents
| Folder | Contents |
|---|---|
./bin |
Scripts and data files for Ripple integrators. |
./Builds |
Platform-specific guides for building rippled. |
./docs |
Source documentation files and doxygen config. |
./cfg |
Example configuration files. |
./src |
Source code. |
Some of the directories under src are external repositories included using
git-subtree. See those directories' README files for more details.