genesis json tests and mv ConsensusParams to types

types/params.go

@@ -0,0 +1,32 @@
+package types
+
+import (
+	"github.com/pkg/errors"
+)
+
+// ConsensusParams contains consensus critical parameters
+// that determine the validity of blocks.
+type ConsensusParams struct {
+	MaxBlockSizeBytes  int `json:"max_block_size_bytes"`
+	BlockPartSizeBytes int `json:"block_part_size_bytes"`
+}
+
+// DefaultConsensusParams returns a default ConsensusParams.
+func DefaultConsensusParams() *ConsensusParams {
+	return &ConsensusParams{
+		MaxBlockSizeBytes:  22020096, // 21MB
+		BlockPartSizeBytes: 65536,    // 64kB,
+	}
+}
+
+// Validate validates the ConsensusParams to ensure all values
+// are within their allowed limits, and returns an error if they are not.
+func (params *ConsensusParams) Validate() error {
+	if params.MaxBlockSizeBytes <= 0 {
+		return errors.Errorf("MaxBlockSizeBytes must be greater than 0. Got %d", params.MaxBlockSizeBytes)
+	}
+	if params.BlockPartSizeBytes <= 0 {
+		return errors.Errorf("BlockPartSizeBytes must be greater than 0. Got %d", params.BlockPartSizeBytes)
+	}
+	return nil
+}