forked from lix-project/lix
Add ContentAddressMethod and parse/render it
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parent
29c82ccc77
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dfa547c6a8
src/libstore
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@ -37,48 +37,86 @@ std::string renderContentAddress(ContentAddress ca) {
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}, ca);
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}
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ContentAddress parseContentAddress(std::string_view rawCa) {
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auto rest = rawCa;
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std::string renderContentAddressMethod(ContentAddressMethod cam) {
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return std::visit(overloaded {
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[](TextHashMethod &th) {
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return std::string{"text:"} + printHashType(htSHA256);
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},
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[](FixedOutputHashMethod &fshm) {
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return "fixed:" + makeFileIngestionPrefix(fshm.fileIngestionMethod) + printHashType(fshm.hashType);
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}
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}, cam);
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}
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/*
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Parses content address strings up to the hash.
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*/
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static ContentAddressMethod parseContentAddressMethodPrefix(std::string_view & rest) {
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std::string wholeInput(rest);
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std::string_view prefix;
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{
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auto optPrefix = splitPrefixTo(rest, ':');
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if (!optPrefix)
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throw UsageError("not a content address because it is not in the form '<prefix>:<rest>': %s", rawCa);
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throw UsageError("not a content address because it is not in the form '<prefix>:<rest>': %s", wholeInput);
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prefix = *optPrefix;
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}
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auto parseHashType_ = [&](){
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auto hashTypeRaw = splitPrefixTo(rest, ':');
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if (!hashTypeRaw)
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throw UsageError("content address hash must be in form '<algo>:<hash>', but found: %s", rawCa);
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throw UsageError("content address hash must be in form '<algo>:<hash>', but found: %s", wholeInput);
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HashType hashType = parseHashType(*hashTypeRaw);
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return std::move(hashType);
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};
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// Switch on prefix
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if (prefix == "text") {
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// No parsing of the method, "text" only support flat.
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// No parsing of the ingestion method, "text" only support flat.
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HashType hashType = parseHashType_();
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if (hashType != htSHA256)
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throw Error("text content address hash should use %s, but instead uses %s",
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printHashType(htSHA256), printHashType(hashType));
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return TextHash {
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.hash = Hash::parseNonSRIUnprefixed(rest, std::move(hashType)),
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};
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return TextHashMethod {};
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} else if (prefix == "fixed") {
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// Parse method
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auto method = FileIngestionMethod::Flat;
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if (splitPrefix(rest, "r:"))
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method = FileIngestionMethod::Recursive;
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HashType hashType = parseHashType_();
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return FixedOutputHash {
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.method = method,
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.hash = Hash::parseNonSRIUnprefixed(rest, std::move(hashType)),
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return FixedOutputHashMethod {
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.fileIngestionMethod = method,
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.hashType = std::move(hashType),
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};
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} else
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throw UsageError("content address prefix '%s' is unrecognized. Recogonized prefixes are 'text' or 'fixed'", prefix);
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};
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}
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ContentAddress parseContentAddress(std::string_view rawCa) {
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auto rest = rawCa;
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ContentAddressMethod caMethod = parseContentAddressMethodPrefix(rest);
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return std::visit(
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overloaded {
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[&](TextHashMethod thm) {
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return ContentAddress(TextHash {
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.hash = Hash::parseNonSRIUnprefixed(rest, htSHA256)
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});
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},
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[&](FixedOutputHashMethod fohMethod) {
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return ContentAddress(FixedOutputHash {
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.method = fohMethod.fileIngestionMethod,
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.hash = Hash::parseNonSRIUnprefixed(rest, std::move(fohMethod.hashType)),
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});
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},
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}, caMethod);
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}
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ContentAddressMethod parseContentAddressMethod(std::string_view caMethod) {
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std::string_view asPrefix {std::string{caMethod} + ":"};
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return parseContentAddressMethodPrefix(asPrefix);
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}
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std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt) {
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return rawCaOpt == "" ? std::optional<ContentAddress> {} : parseContentAddress(rawCaOpt);
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@ -55,4 +55,23 @@ std::optional<ContentAddress> parseContentAddressOpt(std::string_view rawCaOpt);
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Hash getContentAddressHash(const ContentAddress & ca);
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/*
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We only have one way to hash text with references, so this is single-value
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type is only useful in std::variant.
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*/
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struct TextHashMethod { };
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struct FixedOutputHashMethod {
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FileIngestionMethod fileIngestionMethod;
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HashType hashType;
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};
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typedef std::variant<
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TextHashMethod,
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FixedOutputHashMethod
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> ContentAddressMethod;
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ContentAddressMethod parseContentAddressMethod(std::string_view rawCaMethod);
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std::string renderContentAddressMethod(ContentAddressMethod caMethod);
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}
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