cdp: refacto message JSON read

src/cdp/target.zig

@@ -22,8 +22,8 @@ const server = @import("../server.zig");
 const Ctx = server.Ctx;
 const cdp = @import("cdp.zig");
 const result = cdp.result;
-const getMsg = cdp.getMsg;
 const stringify = cdp.stringify;
+const IncomingMessage = @import("msg.zig").IncomingMessage;
 
 const log = std.log.scoped(.cdp);
 
@@ -41,23 +41,22 @@ const Methods = enum {
 
 pub fn target(
     alloc: std.mem.Allocator,
-    id: ?u16,
+    msg: *IncomingMessage,
     action: []const u8,
-    scanner: *std.json.Scanner,
     ctx: *Ctx,
 ) ![]const u8 {
     const method = std.meta.stringToEnum(Methods, action) orelse
         return error.UnknownMethod;
     return switch (method) {
-        .setDiscoverTargets => setDiscoverTargets(alloc, id, scanner, ctx),
-        .setAutoAttach => setAutoAttach(alloc, id, scanner, ctx),
-        .attachToTarget => attachToTarget(alloc, id, scanner, ctx),
-        .getTargetInfo => getTargetInfo(alloc, id, scanner, ctx),
-        .getBrowserContexts => getBrowserContexts(alloc, id, scanner, ctx),
-        .createBrowserContext => createBrowserContext(alloc, id, scanner, ctx),
-        .disposeBrowserContext => disposeBrowserContext(alloc, id, scanner, ctx),
-        .createTarget => createTarget(alloc, id, scanner, ctx),
-        .closeTarget => closeTarget(alloc, id, scanner, ctx),
+        .setDiscoverTargets => setDiscoverTargets(alloc, msg, ctx),
+        .setAutoAttach => setAutoAttach(alloc, msg, ctx),
+        .attachToTarget => attachToTarget(alloc, msg, ctx),
+        .getTargetInfo => getTargetInfo(alloc, msg, ctx),
+        .getBrowserContexts => getBrowserContexts(alloc, msg, ctx),
+        .createBrowserContext => createBrowserContext(alloc, msg, ctx),
+        .disposeBrowserContext => disposeBrowserContext(alloc, msg, ctx),
+        .createTarget => createTarget(alloc, msg, ctx),
+        .closeTarget => closeTarget(alloc, msg, ctx),
     };
 }
 
@@ -69,17 +68,15 @@ const BrowserContextID = "65618675CB7D3585A95049E9DFE95EA9";
 // TODO: noop method
 fn setDiscoverTargets(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     _: *Ctx,
 ) ![]const u8 {
-
     // input
-    const msg = try getMsg(alloc, _id, void, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.setDiscoverTargets" });
+    const input = try msg.getInput(alloc, void);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.setDiscoverTargets" });
 
     // output
-    return result(alloc, msg.id, null, null, msg.sessionID);
+    return result(alloc, input.id, null, null, input.sessionId);
 }
 
 const AttachToTarget = struct {
@@ -104,11 +101,9 @@ const TargetFilter = struct {
 // TODO: noop method
 fn setAutoAttach(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         autoAttach: bool,
@@ -116,11 +111,11 @@ fn setAutoAttach(
         flatten: bool = true,
         filter: ?[]TargetFilter = null,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.setAutoAttach" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.setAutoAttach" });
 
     // attachedToTarget event
-    if (msg.sessionID == null) {
+    if (input.sessionId == null) {
         const attached = AttachToTarget{
             .sessionId = cdp.BrowserSessionID,
             .targetInfo = .{
@@ -134,14 +129,13 @@ fn setAutoAttach(
     }
 
     // output
-    return result(alloc, msg.id, null, null, msg.sessionID);
+    return result(alloc, input.id, null, null, input.sessionId);
 }
 
 // TODO: noop method
 fn attachToTarget(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
 
@@ -150,11 +144,11 @@ fn attachToTarget(
         targetId: []const u8,
         flatten: bool = true,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.setAutoAttach" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.attachToTarget" });
 
     // attachedToTarget event
-    if (msg.sessionID == null) {
+    if (input.sessionId == null) {
         const attached = AttachToTarget{
             .sessionId = cdp.BrowserSessionID,
             .targetInfo = .{
@@ -172,24 +166,22 @@ fn attachToTarget(
         sessionId: []const u8,
     };
     const output = SessionId{
-        .sessionId = msg.sessionID orelse BrowserContextID,
+        .sessionId = input.sessionId orelse BrowserContextID,
     };
-    return result(alloc, msg.id, SessionId, output, null);
+    return result(alloc, input.id, SessionId, output, null);
 }
 
 fn getTargetInfo(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     _: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         targetId: ?[]const u8 = null,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.getTargetInfo" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.getTargetInfo" });
 
     // output
     const TargetInfo = struct {
@@ -208,7 +200,7 @@ fn getTargetInfo(
         .targetId = BrowserTargetID,
         .type = "browser",
     };
-    return result(alloc, msg.id, TargetInfo, targetInfo, null);
+    return result(alloc, input.id, TargetInfo, targetInfo, null);
 }
 
 // Browser context are not handled and not in the roadmap for now
@@ -217,14 +209,12 @@ fn getTargetInfo(
 // TODO: noop method
 fn getBrowserContexts(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
-    const msg = try getMsg(alloc, _id, void, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.getBrowserContexts" });
+    const input = try msg.getInput(alloc, void);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.getBrowserContexts" });
 
     // ouptut
     const Resp = struct {
@@ -238,7 +228,7 @@ fn getBrowserContexts(
         const contextIDs = [0][]const u8{};
         resp = .{ .browserContextIds = &contextIDs };
     }
-    return result(alloc, msg.id, Resp, resp, null);
+    return result(alloc, input.id, Resp, resp, null);
 }
 
 const ContextID = "22648B09EDCCDD11109E2D4FEFBE4F89";
@@ -246,11 +236,9 @@ const ContextID = "22648B09EDCCDD11109E2D4FEFBE4F89";
 // TODO: noop method
 fn createBrowserContext(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         disposeOnDetach: bool = false,
@@ -258,8 +246,8 @@ fn createBrowserContext(
         proxyBypassList: ?[]const u8 = null,
         originsWithUniversalNetworkAccess: ?[][]const u8 = null,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.createBrowserContext" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.createBrowserContext" });
 
     ctx.state.contextID = ContextID;
 
@@ -279,25 +267,23 @@ fn createBrowserContext(
             try writer.writeAll(" }");
         }
     };
-    return result(alloc, msg.id, Resp, Resp{}, msg.sessionID);
+    return result(alloc, input.id, Resp, Resp{}, input.sessionId);
 }
 
 fn disposeBrowserContext(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         browserContextId: []const u8,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.disposeBrowserContext" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.disposeBrowserContext" });
 
     // output
-    const res = try result(alloc, msg.id, null, .{}, null);
+    const res = try result(alloc, input.id, null, .{}, null);
     try server.sendAsync(ctx, res);
 
     return error.DisposeBrowserContext;
@@ -309,11 +295,9 @@ const LoaderID = "DD4A76F842AA389647D702B4D805F49A";
 
 fn createTarget(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         url: []const u8,
@@ -325,8 +309,8 @@ fn createTarget(
         background: bool = false,
         forTab: ?bool = null,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.createTarget" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.createTarget" });
 
     // change CDP state
     ctx.state.frameID = TargetID;
@@ -346,7 +330,7 @@ fn createTarget(
         },
         .waitingForDebugger = true,
     };
-    try cdp.sendEvent(alloc, ctx, "Target.attachedToTarget", AttachToTarget, attached, msg.sessionID);
+    try cdp.sendEvent(alloc, ctx, "Target.attachedToTarget", AttachToTarget, attached, input.sessionId);
 
     // output
     const Resp = struct {
@@ -364,28 +348,26 @@ fn createTarget(
             try writer.writeAll(" }");
         }
     };
-    return result(alloc, msg.id, Resp, Resp{}, msg.sessionID);
+    return result(alloc, input.id, Resp, Resp{}, input.sessionId);
 }
 
 fn closeTarget(
     alloc: std.mem.Allocator,
-    _id: ?u16,
-    scanner: *std.json.Scanner,
+    msg: *IncomingMessage,
     ctx: *Ctx,
 ) ![]const u8 {
-
     // input
     const Params = struct {
         targetId: []const u8,
     };
-    const msg = try getMsg(alloc, _id, Params, scanner);
-    log.debug("Req > id {d}, method {s}", .{ msg.id, "target.closeTarget" });
+    const input = try msg.getInput(alloc, Params);
+    log.debug("Req > id {d}, method {s}", .{ input.id, "target.closeTarget" });
 
     // output
     const Resp = struct {
         success: bool = true,
     };
-    const res = try result(alloc, msg.id, Resp, Resp{}, null);
+    const res = try result(alloc, input.id, Resp, Resp{}, null);
     try server.sendAsync(ctx, res);
 
     // Inspector.detached event
@@ -398,7 +380,7 @@ fn closeTarget(
         "Inspector.detached",
         InspectorDetached,
         .{},
-        msg.sessionID orelse cdp.ContextSessionID,
+        input.sessionId orelse cdp.ContextSessionID,
     );
 
     // detachedFromTarget event
@@ -412,8 +394,8 @@ fn closeTarget(
         "Target.detachedFromTarget",
         TargetDetached,
         .{
-            .sessionId = msg.sessionID orelse cdp.ContextSessionID,
-            .targetId = msg.params.?.targetId,
+            .sessionId = input.sessionId orelse cdp.ContextSessionID,
+            .targetId = input.params.targetId,
         },
         null,
     );