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Simplify the realisations disk cache

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This commit is contained in:
regnat 2021-05-10 17:45:53 +02:00
parent ab96c1ee50
commit d5d19582ef
1 changed files with 10 additions and 11 deletions
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21
src/libstore/nar-info-disk-cache.cc
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@ -42,9 +42,8 @@ create table if not exists NARs (
create table if not exists Realisations (
cache integer not null,
outputId text not null,
content blob, -- Json serialisation of the realisation, or empty if present is true
content blob, -- Json serialisation of the realisation, or null if the realisation is absent
timestamp integer not null,
present integer not null,
primary key (cache, outputId),
foreign key (cache) references BinaryCaches(id) on delete cascade
);
@ -113,22 +112,22 @@ public:
state->insertRealisation.create(state->db,
R"(
insert or replace into Realisations(cache, outputId, content, timestamp, present)
values (?, ?, ?, ?, 1)
insert or replace into Realisations(cache, outputId, content, timestamp)
values (?, ?, ?, ?)
)");
state->insertMissingRealisation.create(state->db,
R"(
insert or replace into Realisations(cache, outputId, timestamp, present)
values (?, ?, ?, 0)
insert or replace into Realisations(cache, outputId, timestamp)
values (?, ?, ?)
)");
state->queryRealisation.create(state->db,
R"(
select present, content from Realisations
select content from Realisations
where cache = ? and outputId = ? and
((present = 0 and timestamp > ?) or
(present = 1 and timestamp > ?))
((content is null and timestamp > ?) or
(content is not null and timestamp > ?))
)");
/* Periodically purge expired entries from the database. */
@ -265,12 +264,12 @@ public:
if (!queryRealisation.next())
return {oUnknown, 0};
if (queryRealisation.getInt(0) == 0)
if (queryRealisation.isNull(0))
return {oInvalid, 0};
auto realisation =
std::make_shared<Realisation>(Realisation::fromJSON(
nlohmann::json::parse(queryRealisation.getStr(1)),
nlohmann::json::parse(queryRealisation.getStr(0)),
"Local disk cache"));
return {oValid, realisation};