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`internal/ptr` asks Google, Cloudflare, AdGuard and Quad9 in turn, 2 seconds in all per address. It keeps answers in memory and writes them through to `cache.db`, opened by the new `internal/cachedb`. A reserved address is not sent to the resolvers. Judgement calls: - Each resolver gets an equal share of the time left, so a hung resolver does not use up the 2 seconds. - The negative TTL is the smaller of the SOA minimum and the SOA's own TTL (RFC 2308). - Names that are not host names are dropped, as `net.Resolver.LookupAddr` does. Model: opus-5-5
9 lines
307 B
SQL
9 lines
307 B
SQL
-- hostnames holds the PTR names of addresses. names has the names separated by
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-- spaces, and is empty for an address with no PTR names. expires_at is in
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-- seconds since 1970.
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CREATE TABLE IF NOT EXISTS hostnames (
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address TEXT PRIMARY KEY,
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names TEXT NOT NULL,
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expires_at INTEGER NOT NULL
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);
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