An mdns based config service.
This provides a map of attribute to string value. The map
is named and is eventually consistent across a network.
This is strictly a library interface, not a veyron RPC/IDL
interface.
Change-Id: I651dc1abc5ec34530f2f8118b0ad762ba183e52d
diff --git a/services/config/lib/model.go b/services/config/lib/model.go
new file mode 100644
index 0000000..92aa459
--- /dev/null
+++ b/services/config/lib/model.go
@@ -0,0 +1,37 @@
+package config
+
+// ConfigService exists to get things going when you plug a device into a network.
+// Anything that we currently pass to apps as environment variables (proxy server,
+// global name server, ...) should come from here.
+
+// Both keys and values can have embedded white space but they can't start
+// or end with whitespace. keys cannot include ':'s.
+
+type Pair struct {
+ Key string
+ Value string
+ Nonexistant bool
+}
+
+type ConfigService interface {
+ // Stop stops a config service.
+ Stop()
+
+ // Get returns the value associated with name or an error if no value exists
+ // or can be determined.
+ Get(name string) (string, error)
+
+ // GetAll returns all attribute/value pairs as a map or an error if no config
+ // can be found.
+ GetAll() (map[string]string, error)
+
+ // Watch returns a stream of values for a particuar key.
+ Watch(key string) chan Pair
+
+ // Watch returns a stream key, value pairs.
+ WatchAll() chan Pair
+
+ // Reread the config info (for example, from a file). In particular
+ // this says nothing about where the config resides or how it is read.
+ Reread() error
+}
