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Debugging why @ipld/car is failing with car files that contain zero length files/blocks.
$ node car-test.mjs
Usage: node car-test.mjs --empty-block=true|false --car-file=true|false [--skip-write]
Add two normal IPLD blocks. Connect writer async iterable output directly to reader.
$ node car-test.mjs --empty-block=false --car-file=false
Insert empty block: false
Use .car file: false
Put cidA CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei) Uint8Array(2) [ 1, 2 ]
Put cidC CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4) Uint8Array(2) [ 3, 4 ]
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidC {
bytes: Uint8Array(2) [ 3, 4 ],
cid: CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4)
}
This works as expected.
Add a normal IPLD blocks, then a IPLD block with no data, and finally another normal IPLD block. Connect writer async iterable output directly to reader.
$ node car-test.mjs --empty-block=true --car-file=false
Insert empty block: true
Use .car file: false
Put cidA CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei) Uint8Array(2) [ 1, 2 ]
Put cidB CID(bafkreihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku) Uint8Array(0) []
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidB {
bytes: Uint8Array(0) [],
cid: CID(bafkreihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku)
}
Got cidC undefined WRONG!!
Put cidC CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4) Uint8Array(2) [ 3, 4 ]
This fails. The reader tried to read the third block before it was written, and
got undefined as a result.
Add two normal IPLD blocks. Write out to a .car file on the filesystem and read it.
$ node car-test.mjs --empty-block=false --car-file=true
Insert empty block: false
Use .car file: true
Filename: example.car
Skip write: false
Put cidA CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei) Uint8Array(2) [ 1, 2 ]
Put cidC CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4) Uint8Array(2) [ 3, 4 ]
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidC {
bytes: Uint8Array(2) [ 3, 4 ],
cid: CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4)
}
This works as expected.
A file named example.car was written to the filesystem. Let's try re-reading that
(skip the writing phase).
$ node car-test.mjs --empty-block=false --car-file=true --skip-write
Insert empty block: false
Use .car file: true
Filename: example.car
Skip write: true
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidC {
bytes: Uint8Array(2) [ 3, 4 ],
cid: CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4)
}
This is the same correct result as before.
Add a normal IPLD blocks, then a IPLD block with no data, and finally another normal IPLD block. Write out to a .car file on the filesystem and read it.
$ node car-test.mjs --empty-block=true --car-file=true
Insert empty block: true
Use .car file: true
Filename: example-empty.car
Skip write: false
Put cidA CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei) Uint8Array(2) [ 1, 2 ]
Put cidB CID(bafkreihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku) Uint8Array(0) []
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidB {
bytes: Uint8Array(0) [],
cid: CID(bafkreihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku)
}
Got cidC undefined WRONG!!
Put cidC CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4) Uint8Array(2) [ 3, 4 ]
This also fails. The reader tried to read the third block before it was written, and
got undefined as a result.
A file named example-empty.car was written to the filesystem. Let's try re-reading that
(skip the writing phase).
$ node car-test.mjs --empty-block=true --car-file=true --skip-write
Insert empty block: true
Use .car file: true
Filename: example-empty.car
Skip write: true
Got cidA {
bytes: Uint8Array(2) [ 1, 2 ],
cid: CID(bafkreifbfby75yqq7odbski6v2qziwa4xustdzfsg5m5ejpwqbush5rsei)
}
Got cidB {
bytes: Uint8Array(0) [],
cid: CID(bafkreihdwdcefgh4dqkjv67uzcmw7ojee6xedzdetojuzjevtenxquvyku)
}
Got cidC {
bytes: Uint8Array(2) [ 3, 4 ],
cid: CID(bafkreiam4okax27swivf2iii5tymg2fakqoh4pcfoa7ykqesdnhk7sbji4)
}
Interesting! It read the .car file correctly. The incorrect result only seems to happen when the file is being read at the same time as it is written.
MIT
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