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chore: added tests for copied functionality
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sync_service/lib/electric/postgres/replication_client/collector.ex
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,129 @@ | ||
| defmodule Electric.Postgres.ReplicationClient.Collector do | ||
| @moduledoc """ | ||
| Conversion of incoming Postgres logical replication messages | ||
| to internal change representation. | ||
| """ | ||
|
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||
| require Logger | ||
| alias Electric.Replication.Changes | ||
| alias Electric.Postgres.LogicalReplication.Messages, as: LR | ||
|
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| alias Electric.Replication.Changes.{ | ||
| Transaction, | ||
| NewRecord, | ||
| UpdatedRecord, | ||
| DeletedRecord, | ||
| TruncatedRelation | ||
| } | ||
|
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| defstruct transaction: nil, relations: %{} | ||
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| @type t() :: %__MODULE__{ | ||
| transaction: nil | Transaction.t(), | ||
| relations: %{optional(LR.relation_id()) => LR.Relation.t()} | ||
| } | ||
|
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| @doc """ | ||
| Handle incoming logical replication message by either building up a transaction or | ||
| returning a complete built up transaction. | ||
| """ | ||
| @spec handle_message(LR.message(), t()) :: t() | {Transaction.t(), t()} | ||
| def handle_message(%LR.Message{} = msg, state) do | ||
| Logger.info("Got a message from PG via logical replication: #{inspect(msg)}") | ||
|
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| state | ||
| end | ||
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| def handle_message(%LR.Begin{} = msg, %__MODULE__{} = state) do | ||
| txn = %Transaction{ | ||
| xid: msg.xid, | ||
| lsn: msg.final_lsn, | ||
| changes: [], | ||
| commit_timestamp: msg.commit_timestamp | ||
| } | ||
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| %{state | transaction: txn} | ||
| end | ||
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| def handle_message(%LR.Origin{} = _msg, state), do: state | ||
| def handle_message(%LR.Type{}, state), do: state | ||
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| def handle_message(%LR.Relation{id: id} = rel, %__MODULE__{} = state) do | ||
| if Map.get(state.relations, id, rel) != rel do | ||
| Logger.warning("Schema for the table #{rel.namespace}.#{rel.name} had changed") | ||
| end | ||
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| Map.update!(state, :relations, &Map.put(&1, rel.id, rel)) | ||
| end | ||
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| def handle_message(%LR.Insert{} = msg, %__MODULE__{} = state) do | ||
| relation = Map.fetch!(state.relations, msg.relation_id) | ||
|
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| data = data_tuple_to_map(relation.columns, msg.tuple_data) | ||
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| %NewRecord{relation: {relation.namespace, relation.name}, record: data} | ||
| |> prepend_change(state) | ||
| end | ||
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| def handle_message(%LR.Update{} = msg, %__MODULE__{} = state) do | ||
| relation = Map.get(state.relations, msg.relation_id) | ||
|
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| old_data = data_tuple_to_map(relation.columns, msg.old_tuple_data) | ||
| data = data_tuple_to_map(relation.columns, msg.tuple_data) | ||
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| UpdatedRecord.new( | ||
| relation: {relation.namespace, relation.name}, | ||
| old_record: old_data, | ||
| record: data | ||
| ) | ||
| |> prepend_change(state) | ||
| end | ||
|
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| def handle_message(%LR.Delete{} = msg, %__MODULE__{} = state) do | ||
| relation = Map.get(state.relations, msg.relation_id) | ||
|
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| data = | ||
| data_tuple_to_map( | ||
| relation.columns, | ||
| msg.old_tuple_data || msg.changed_key_tuple_data | ||
| ) | ||
|
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| %DeletedRecord{ | ||
| relation: {relation.namespace, relation.name}, | ||
| old_record: data | ||
| } | ||
| |> prepend_change(state) | ||
| end | ||
|
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| def handle_message(%LR.Truncate{} = msg, state) do | ||
| msg.truncated_relations | ||
| |> Enum.map(&Map.get(state.relations, &1)) | ||
| |> Enum.map(&%TruncatedRelation{relation: {&1.namespace, &1.name}}) | ||
| |> Enum.reduce(state, &prepend_change/2) | ||
| end | ||
|
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| def handle_message( | ||
| %LR.Commit{lsn: commit_lsn, end_lsn: end_lsn}, | ||
| %__MODULE__{transaction: txn} = state | ||
| ) | ||
| when not is_nil(txn) and commit_lsn == txn.lsn do | ||
| {%Transaction{txn | lsn: end_lsn, changes: Enum.reverse(txn.changes)}, | ||
| %__MODULE__{state | transaction: nil}} | ||
| end | ||
|
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| @spec data_tuple_to_map([LR.Relation.Column.t()], list(String.t())) :: %{ | ||
| String.t() => String.t() | ||
| } | ||
| defp data_tuple_to_map(_columns, nil), do: %{} | ||
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| defp data_tuple_to_map(columns, tuple_data) do | ||
| columns | ||
| |> Enum.zip(tuple_data) | ||
| |> Map.new(fn {column, data} -> {column.name, data} end) | ||
| end | ||
|
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| @spec prepend_change(Changes.change(), t()) :: t() | ||
| defp prepend_change(change, %__MODULE__{transaction: txn} = state) do | ||
| %{state | transaction: Transaction.prepend_change(txn, change)} | ||
| end | ||
| end |
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