Implemented Stellar History Archive Checkpoint - #438
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📝 WalkthroughWalkthroughArchive checkpoint fetching now uses public category-aware path formatting, normalized archive URLs, configurable request timeouts, and expanded mock-server tests for success, failover, decompression errors, and incomplete results. ChangesArchive fetching
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The new archive download path can consume unbounded memory when a configured archive returns oversized or highly compressed content, potentially terminating the consuming process, and a zero-second timeout configuration can make every request fail immediately. Merge readiness requires size limits and timeout validation, or explicit owner acceptance of these bounded risks. Sequence Diagram(s)sequenceDiagram
participant ArchiveClient
participant ArchiveServer
participant GzDecoder
ArchiveClient->>ArchiveServer: GET ledger, transactions, and results archives
ArchiveServer-->>ArchiveClient: return HTTP responses
ArchiveClient->>GzDecoder: decompress gzip bodies
GzDecoder-->>ArchiveClient: return XDR bytes
ArchiveClient-->>ArchiveClient: fail over to the next archive URL when needed
Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Description checkExplanation The description includes all required sections, explains the implementation, records issues, links issue Full details: Linked Issues checkExplanation The implementation satisfies issue Full details: Out of Scope Changes checkExplanation The changes remain within the archive client objective. The added typed categories, URL helpers, timeout configuration, error handling, derives, and tests directly support the requested history archive implementation. ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@crates/core/src/archive/mod.rs`:
- Around line 96-99: Validate NetworkConfig.request_timeout_secs is greater than
zero before constructing the reqwest client, returning or propagating a
configuration error for zero values. Update the archive client setup to preserve
build failures instead of falling back to reqwest::Client::new, while retaining
the configured timeout for valid values.
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📒 Files selected for processing (1)
crates/core/src/archive/mod.rs
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@Malajussy2704 fix code review changes |
i'm on it |
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All done! |
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PR reviewed |
2 participants
Description
This PR implements the Stellar history archive HTTP client in the core crate (
crates/core/src/archive/mod.rs). The client is now capable of fetching a complete history archive checkpoint (consisting of the ledger, transactions, and results category gzip files) for a requested ledger sequence, decompressing them, and returning them in anArchiveCheckpointstructure containing the raw decompressed XDR bytes.How It Was Done
ArchiveCategoryenum (Ledger,Transactions,Results) to prevent arbitrary string paths.format_archive_pathwhich derives the correct Stellar history archive path using the 8-character hexadecimal representation of the checkpoint sequence grouped into directory components (e.g.,ledger/00/00/00/ledger-0000003f.xdr.gz).join_urlhelper that trims trailing slashes from archive base URLs and leading slashes from relative paths to avoid malformed URLs (e.g. double slashes//).reqwest::ClientinArchiveClient::newusing therequest_timeout_secsfield defined in theNetworkConfig.fetch_checkpointto iterate over all configured archive URLs, ensuring that if any download or decompression fails (e.g., timeouts, non-2xx responses, invalid gzip data, connection issues), the client discards the partial work and falls back to the next configured URL.ArchiveErrorKind::FetchFailedwrapping the last observed root-cause error's description to aid troubleshooting without leaking sensitive endpoints.Issues Encountered (If Any)
LLVM ERROR: IO failure on output stream: no space on device. Runningcargo cleansuccessfully reclaimed2.3 GiBof space, allowing compiling and tests to proceed cleanly.DecompressionFailed) and HTTP errors during individual archive attempts are mapped toArchiveErrorKind::FetchFailedupon final exhaust of the loop so they match standard client error assertions while retaining diagnostics.Related Issue
Closes #430
How It Was Tested
Verified the implementation by expanding the test suite in the
archivemodule to 19 unit/integration tests using multi-client concurrent mock servers:0,1,62,63,64,127,128).format_archive_pathoutputs for all categories and large checkpoints (e.g.,65535).FetchFailedwhen all URLs are exhausted.All 380 core crate tests pass successfully, and
cargo fmt --checkandcargo clippy --all-targetsare clean.Screenshots / Video (If Applicable)
Summary by CodeRabbit
New Features
Bug Fixes