fix(antd-elixir): print cost-estimate fields in examples to avoid stringification crash

antd-elixir/examples/02_data.exs

@@ -2,18 +2,30 @@ Mix.install([
   {:antd, path: ".."}
 ])
 
-# Store and retrieve public immutable data
+# Example 02: Store and retrieve public data, with cost estimation.
+#
+# Prerequisite: antd daemon running on local testnet.
+
 client = Antd.Client.new()
 
-# Store data
-{:ok, result} = Antd.Client.data_put_public(client, "Hello, Autonomi!")
-IO.puts("Stored at: #{result.address}")
-IO.puts("Cost: #{result.cost} atto")
+payload = "Hello, Autonomi!"
+
+# Estimate cost before storing
+{:ok, est} = Antd.Client.data_cost(client, payload)
+IO.puts(
+  "Estimate: #{est.file_size} bytes in #{est.chunk_count} chunks, " <>
+  "storage #{est.cost} atto, gas #{est.estimated_gas_cost_wei} wei, " <>
+  "mode #{est.payment_mode}"
+)
 
-# Retrieve data
+# Store public data
+{:ok, result} = Antd.Client.data_put_public(client, payload)
+IO.puts("Stored at address: #{result.address}")
+IO.puts("Actual cost: #{result.cost} atto tokens")
+
+# Retrieve it back
 {:ok, data} = Antd.Client.data_get_public(client, result.address)
 IO.puts("Retrieved: #{data}")
 
-# Estimate cost before storing
-{:ok, cost} = Antd.Client.data_cost(client, "Some data to estimate")
-IO.puts("Estimated cost: #{cost} atto")
+unless data == payload, do: raise "Round-trip mismatch!"
+IO.puts("Public data round-trip OK!")

antd-elixir/examples/04_files.exs

@@ -25,4 +25,4 @@ IO.puts("Directory downloaded to /tmp/mydir_copy")
 
 # Estimate file upload cost
 {:ok, cost} = Antd.Client.file_cost(client, "/tmp/example.txt", true, false)
-IO.puts("Estimated upload cost: #{cost} atto")
+IO.puts("Estimated upload cost: #{cost.cost} atto (#{cost.chunk_count} chunks)")

antd-elixir/examples/05_graph.exs

@@ -27,4 +27,4 @@ IO.puts("Exists: #{exists}")
 
 # Estimate cost
 {:ok, cost} = Antd.Client.graph_entry_cost(client, "public_key_hex")
-IO.puts("Estimated graph entry cost: #{cost} atto")
+IO.puts("Estimated graph entry cost: #{cost.cost} atto (#{cost.chunk_count} chunks)")