1 files changed, 40 insertions, 0 deletions
diff --git a/pkg/monitor/messages.go b/pkg/monitor/messages.go
new file mode 100644
index 0000000..717aae6
--- /dev/null
+++ b/pkg/monitor/messages.go
@@ -0,0 +1,40 @@
+package monitor
+
+import (
+	ct "github.com/google/certificate-transparency-go"
+	"gitlab.torproject.org/rgdd/ct/pkg/metadata"
+)
+
+// MessageLogConfig provides information about a log the monitor is downloading
+type MessageLogConfig struct {
+	Metadata metadata.Log
+	State    MonitorState
+}
+
+// MessageLogProgress is the next log state and any encountered leaves that were
+// considered matching since the previous log state.  Parse errors are included.
+type MessageLogProgress struct {
+	State   MonitorState
+	Matches []LogEntry
+	Errors  []error
+}
+
+// MonitorState describes the monitor's state for a particular log.  The signed tree
+// head is the latest verified append-only state that was observed.  The index
+// is the next leaf which will be downloaded and processed by the monitor.
+type MonitorState struct {
+	LogState
+	NextIndex uint64
+}
+
+// LogState describes the state of a log
+type LogState struct {
+	ct.SignedTreeHead
+}
+
+// LogEntry is a leaf in a log's Merkle tree
+type LogEntry struct {
+	LeafIndex uint64
+	LeafData  []byte
+	ExtraData []byte
+}