Bolty.Policy (Bolty v0.0.12)

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Resolved driver behaviour for a single connection.

Produced once at HELLO completion by the internal resolver (Bolty.Policy.Resolver), stashed on the connection state, and threaded into every pack/unpack call. Codecs pattern-match on policy fields and never read a Bolt or server version directly.

Policy is an internal distillation of negotiated facts, not a user-facing configuration surface. Users influence policy by passing connection options (e.g. constraining :versions at negotiation); the resolver responds accordingly.

See .agent-notes/policy-design.md for the authoritative design.

Summary

Types

datetime()

DateTime encoding dialect.

t()

Types

datetime()

@type datetime() :: :legacy | :evolved

DateTime encoding dialect.

  • :legacy — emit legacy struct tags (0x46 for DateTime-with-offset, 0x66 for DateTime-with-zone-id). Required for Bolt 4.x wire, regardless of the server's own version.
  • :evolved — emit evolved struct tags (0x49, 0x69). Required for Bolt 5.x wire.

t()

@type t() :: %Bolty.Policy{datetime: datetime()}