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The integration test's span assertions never actually ran. check_span() built a Tempo /api/search call with --data-urlencode but no -G, so curl POSTed the params as a body; Tempo answers 200 and ignores the query, so every span name looked present. Verified against a live Tempo 2.9.4: the buggy form returns the store's total trace count for any name, including "zzz.does.not.exist"; with -G a real name returns 1 and a bogus one 0. Fixed alongside it: the RPC check asserted "rpc.request", which is never emitted (ServerHandler.cpp builds "rpc.http_request"). These two had to change together, since -G turns the bogus name from a silent pass into a hard failure. Also in the script: a consensus timeout logged two failures and counted two, because a post-loop else re-reported what the timeout branch had already reported; and three unguarded curl calls aborted the whole script under set -euo pipefail, making the ACCOUNT_ZERO fallback dead code with no cleanup. Guarded the curls and wired an EXIT trap to the existing cleanup(). The trap deliberately fires only before the summary, so a completed run still leaves the stack up as the header documents. Docs corrections, all re-derived from code: - span inventory heading 35 -> 38, attribute heading 83 -> 89 rows (78 unique keys), and the section 6 header table now carries the missing TxApplySpanNames.h row so its columns sum to the same figures - two stale paths: ConsensusSpanNames.h is under include/xrpl/consensus/, TxSpanNames.h under src/xrpld/telemetry/ - consensus_round_id is int64, not string (RCLConsensus.cpp sets prevLgr.seq() + 1); the runbook's TraceQL examples now use a numeric literal instead of an unparseable bare <round_id> - state-accounting duration gauges are cumulative MICROSECONDS, not seconds (NetworkOPs.cpp declares std::chrono::microseconds and publishes dur.count() raw) - sampling_ratio is not a config key; head sampling is fixed at 1.0 and the shipped collector has no tail sampling, so the caveat was rewritten - the plan blurb referenced Jaeger; this stack is Tempo
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 crypto-asset native to the XRP Ledger, and is designed as a gas token for network services and to bridge different currencies. 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.
xrpld
The server software that powers the XRP Ledger is called xrpld and is available in this repository under the permissive ISC open-source license. The xrpld server software is written primarily in C++ and runs on a variety of platforms. The xrpld server software can run in several modes depending on its configuration.
If you are interested in running an API Server (including a Full History Server), take a look at Clio. (xrpld Reporting Mode has been replaced by Clio.)
Build from Source
- Read the build instructions in
BUILD.md - If you encounter any issues, please open an issue
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 fees.
- Responsible Software Governance: A team of full-time developers at Ripple & other organizations 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.
- 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: Features like Escrow, Checks, and Payment Channels support financial applications atop of the XRP Ledger. 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/xrpld/**/*.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 XRPL developers. |
./Builds |
Platform-specific guides for building xrpld. |
./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.