refactor: move http api to a new transport layer

internal/config/defaults.go

@@ -14,5 +14,8 @@ var DefaultConfig = Config{
 			BackoffCount:     4,
 			NodeTimeout:      120,
 		},
+		Host: HostConfig{
+			ListenAddress: "0.0.0.0:56715",
+		},
 	},
 }

internal/config/host.go

@@ -12,6 +12,7 @@ type HostConfig struct {
 	LocalAddress       string `toml:"local_address"`
 	InternalEntrypoint string `toml:"internal_entrypoint"`
 	ExternalEntrypoint string `toml:"external_entrypoint"`
+	ListenAddress      string `toml:"listen_address"`
 	baseRoleConfig
 }
 
@@ -40,6 +41,10 @@ func (c HostConfig) Validate() error {
 		return errors.New("missing external entrypoint")
 	}
 
+	if c.ListenAddress == "" {
+		return errors.New("missing listen address")
+	}
+
 	return nil
 }
 
@@ -67,4 +72,8 @@ func (c *HostConfig) Merge(other HostConfig) {
 	if other.ExternalEntrypoint != "" {
 		c.ExternalEntrypoint = other.ExternalEntrypoint
 	}
+
+	if other.ListenAddress != "" {
+		c.ListenAddress = other.ListenAddress
+	}
 }

internal/config/node.go

@@ -53,8 +53,12 @@ func (c NodeConfig) Validate() error {
 		return errors.New("invalid keepalive_interval")
 	}
 
+	if c.ListenOn == "" {
+		return errors.New("missing listen_on")
+	}
+
 	if net.ParseIP(c.ListenOn) == nil {
-		return errors.New("invalid listen_on")
+		return fmt.Errorf("invalid listen_on: %v", c.ListenOn)
 	}
 
 	return nil