cdp: use an enum for SessionID

Author: krichprollsch

src/cdp/cdp.zig

@@ -121,7 +121,7 @@ pub fn dispatch(
 pub const State = struct {
     executionContextId: u32 = 0,
     contextID: ?[]const u8 = null,
-    sessionID: ?[]const u8 = null,
+    sessionID: SessionID = .CONTEXTSESSIONID0497A05C95417CF4,
     frameID: []const u8 = FrameID,
     url: []const u8 = URLBase,
     securityOrigin: []const u8 = URLBase,
@@ -225,8 +225,21 @@ pub fn sendEvent(
 // ------
 
 // TODO: hard coded IDs
-pub const BrowserSessionID = "BROWSERSESSIONID597D9875C664CAC0";
-pub const ContextSessionID = "CONTEXTSESSIONID0497A05C95417CF4";
+pub const SessionID = enum {
+    BROWSERSESSIONID597D9875C664CAC0,
+    CONTEXTSESSIONID0497A05C95417CF4,
+
+    pub fn parse(str: []const u8) !SessionID {
+        inline for (@typeInfo(SessionID).Enum.fields) |enumField| {
+            if (std.mem.eql(u8, str, enumField.name)) {
+                return @field(SessionID, enumField.name);
+            }
+        }
+        return error.InvalidSessionID;
+    }
+};
+pub const BrowserSessionID = @tagName(SessionID.BROWSERSESSIONID597D9875C664CAC0);
+pub const ContextSessionID = @tagName(SessionID.CONTEXTSESSIONID0497A05C95417CF4);
 pub const URLBase = "chrome://newtab/";
 pub const LoaderID = "LOADERID24DD2FD56CF1EF33C965C79C";
 pub const FrameID = "FRAMEIDD8AED408A0467AC93100BCDBE";

src/cdp/runtime.zig

@@ -117,7 +117,12 @@ fn sendInspector(
         }
     }
 
-    ctx.state.sessionID = msg.sessionId;
+    if (msg.sessionId) |s| {
+        ctx.state.sessionID = cdp.SessionID.parse(s) catch |err| {
+            log.err("parse sessionID: {s} {any}", .{ s, err });
+            return err;
+        };
+    }
 
     // remove awaitPromise true params
     // TODO: delete when Promise are correctly handled by zig-js-runtime

src/cdp/target.zig

@@ -344,7 +344,13 @@ fn createTarget(
     ctx.state.securityOrigin = "://";
     ctx.state.secureContextType = "InsecureScheme";
     ctx.state.loaderID = LoaderID;
-    ctx.state.sessionID = msg.sessionId;
+
+    if (msg.sessionId) |s| {
+        ctx.state.sessionID = cdp.SessionID.parse(s) catch |err| {
+            log.err("parse sessionID: {s} {any}", .{ s, err });
+            return err;
+        };
+    }
 
     // TODO stop the previous page instead?
     if (ctx.browser.session.page != null) return error.pageAlreadyExists;

src/server.zig

@@ -348,7 +348,7 @@ pub const Ctx = struct {
         const s = try std.fmt.allocPrint(
             allocator,
             tpl,
-            .{ msg_open, ctx.state.sessionID orelse cdp.ContextSessionID },
+            .{ msg_open, @tagName(ctx.state.sessionID) },
         );
 
         try ctx.send(s);