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-rw-r--r--cache/index.go20
-rw-r--r--cache/types.go24
-rw-r--r--types.go4
3 files changed, 46 insertions, 2 deletions
diff --git a/cache/index.go b/cache/index.go
new file mode 100644
index 0000000..e0a3dd0
--- /dev/null
+++ b/cache/index.go
@@ -0,0 +1,20 @@
+package cache
+
+// NewUserIndex returns a new instance of a user index
+func NewUserIndex() *UserIndex {
+	return &UserIndex{}
+}
+
+// AddUser inserts a new user into the index. The *Data struct only contains the nickname.)
+func (index UserIndex) AddUser(nick string, url string) {
+	imutex.Lock()
+	index[url] = &Data{nick: nick}
+	imutex.Unlock()
+}
+
+// DelUser removes a user from the index completely.
+func (index UserIndex) DelUser(url string) {
+	imutex.Lock()
+	delete(index, url)
+	imutex.Unlock()
+}
diff --git a/cache/types.go b/cache/types.go
new file mode 100644
index 0000000..8f364d5
--- /dev/null
+++ b/cache/types.go
@@ -0,0 +1,24 @@
+package cache
+
+import (
+	"sync"
+)
+
+// Indexer allows for other uses of the Index functions
+type Indexer interface {
+	AddUser(string, string)
+	DelUser(string)
+}
+
+// UserIndex provides an index of users by URL
+type UserIndex map[string]*Data
+
+// Data from user's twtxt.txt
+type Data struct {
+	nick   string
+	url    string
+	status []string
+}
+
+// Mutex to control access to the User Index
+var imutex = sync.RWMutex{}
diff --git a/types.go b/types.go
index 8e924ca..35f70b3 100644
--- a/types.go
+++ b/types.go
@@ -11,11 +11,11 @@ type configuration struct {
 	stdoutLogging bool
 	instance
 }
+
+// refers to this specific instance of getwtxt
 type instance struct {
 	name  string
 	url   string
 	owner string
 	mail  string
 }
-
-// index of users