48 lines
1.5 KiB
MySQL
48 lines
1.5 KiB
MySQL
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-- +goose Up
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-- +goose StatementBegin
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-- returns the number of child headers that reference backwards to the header with the provided hash
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CREATE OR REPLACE FUNCTION header_weight(hash VARCHAR(66)) RETURNS BIGINT
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AS $$
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WITH RECURSIVE validator AS (
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SELECT block_hash, parent_hash, block_number
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FROM eth.header_cids
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WHERE block_hash = hash
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UNION
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SELECT eth.header_cids.block_hash, eth.header_cids.parent_hash, eth.header_cids.block_number
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FROM eth.header_cids
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INNER JOIN validator
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ON eth.header_cids.parent_hash = validator.block_hash
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AND eth.header_cids.block_number = validator.block_number + 1
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)
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SELECT COUNT(*) FROM validator;
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$$ LANGUAGE SQL;
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-- +goose StatementEnd
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-- +goose StatementBegin
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-- returns the id for the header at the provided height which is heaviest
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CREATE OR REPLACE FUNCTION canonical_header(height BIGINT) RETURNS INT AS
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$BODY$
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DECLARE
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current_weight INT;
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heaviest_weight INT DEFAULT 0;
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heaviest_id INT;
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r eth.header_cids%ROWTYPE;
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BEGIN
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FOR r IN SELECT * FROM eth.header_cids
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WHERE block_number = height
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LOOP
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SELECT INTO current_weight * FROM header_weight(r.block_hash);
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IF current_weight > heaviest_weight THEN
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heaviest_weight := current_weight;
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heaviest_id := r.id;
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END IF;
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END LOOP;
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RETURN heaviest_id;
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END
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$BODY$
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LANGUAGE 'plpgsql';
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-- +goose StatementEnd
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-- +goose Down
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DROP FUNCTION header_weight;
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DROP FUNCTION canonical_header;
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