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authorMartin Ashby <martin@ashbysoft.com>2023-08-21 22:10:31 +0100
committerMartin Ashby <martin@ashbysoft.com>2023-08-21 22:10:31 +0100
commit34a423c3608b2ec2c852986350152cb6c38ba4be (patch)
tree8f671160db1b61ca00cd923ce52a20d948c79da2
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initialHEADmain
-rw-r--r--.gitignore2
-rw-r--r--Caddyfile7
-rw-r--r--README.md11
-rw-r--r--build.zig70
-rw-r--r--src/main.zig27
5 files changed, 117 insertions, 0 deletions
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c82b07
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+zig-cache
+zig-out
diff --git a/Caddyfile b/Caddyfile
new file mode 100644
index 0000000..633bf24
--- /dev/null
+++ b/Caddyfile
@@ -0,0 +1,7 @@
+{
+ order cgi before respond
+}
+
+http://localhost:8080
+
+cgi / zig-out/bin/cgifun
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..5556f06
--- /dev/null
+++ b/README.md
@@ -0,0 +1,11 @@
+# cgifun
+
+Just an extremely simple example of a CGI program with caddy web server and zig as the CGI program.
+
+To run:
+* Have caddy with [CGI plugin](https://caddyserver.com/docs/modules/http.handlers.cgi)
+* Have [zig](https://ziglang.org/download/) programming language.
+* `zig build && caddy run`
+* Open http://localhost:8080 in your browser
+
+You'll see a webpage full of environment variables which are passed as part of the CGI protocol to the cgifun program. \ No newline at end of file
diff --git a/build.zig b/build.zig
new file mode 100644
index 0000000..d9cfe4d
--- /dev/null
+++ b/build.zig
@@ -0,0 +1,70 @@
+const std = @import("std");
+
+// Although this function looks imperative, note that its job is to
+// declaratively construct a build graph that will be executed by an external
+// runner.
+pub fn build(b: *std.Build) void {
+ // Standard target options allows the person running `zig build` to choose
+ // what target to build for. Here we do not override the defaults, which
+ // means any target is allowed, and the default is native. Other options
+ // for restricting supported target set are available.
+ const target = b.standardTargetOptions(.{});
+
+ // Standard optimization options allow the person running `zig build` to select
+ // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not
+ // set a preferred release mode, allowing the user to decide how to optimize.
+ const optimize = b.standardOptimizeOption(.{});
+
+ const exe = b.addExecutable(.{
+ .name = "cgifun",
+ // In this case the main source file is merely a path, however, in more
+ // complicated build scripts, this could be a generated file.
+ .root_source_file = .{ .path = "src/main.zig" },
+ .target = target,
+ .optimize = optimize,
+ });
+
+ // This declares intent for the executable to be installed into the
+ // standard location when the user invokes the "install" step (the default
+ // step when running `zig build`).
+ b.installArtifact(exe);
+
+ // This *creates* a Run step in the build graph, to be executed when another
+ // step is evaluated that depends on it. The next line below will establish
+ // such a dependency.
+ const run_cmd = b.addRunArtifact(exe);
+
+ // By making the run step depend on the install step, it will be run from the
+ // installation directory rather than directly from within the cache directory.
+ // This is not necessary, however, if the application depends on other installed
+ // files, this ensures they will be present and in the expected location.
+ run_cmd.step.dependOn(b.getInstallStep());
+
+ // This allows the user to pass arguments to the application in the build
+ // command itself, like this: `zig build run -- arg1 arg2 etc`
+ if (b.args) |args| {
+ run_cmd.addArgs(args);
+ }
+
+ // This creates a build step. It will be visible in the `zig build --help` menu,
+ // and can be selected like this: `zig build run`
+ // This will evaluate the `run` step rather than the default, which is "install".
+ const run_step = b.step("run", "Run the app");
+ run_step.dependOn(&run_cmd.step);
+
+ // Creates a step for unit testing. This only builds the test executable
+ // but does not run it.
+ const unit_tests = b.addTest(.{
+ .root_source_file = .{ .path = "src/main.zig" },
+ .target = target,
+ .optimize = optimize,
+ });
+
+ const run_unit_tests = b.addRunArtifact(unit_tests);
+
+ // Similar to creating the run step earlier, this exposes a `test` step to
+ // the `zig build --help` menu, providing a way for the user to request
+ // running the unit tests.
+ const test_step = b.step("test", "Run unit tests");
+ test_step.dependOn(&run_unit_tests.step);
+}
diff --git a/src/main.zig b/src/main.zig
new file mode 100644
index 0000000..e4fab76
--- /dev/null
+++ b/src/main.zig
@@ -0,0 +1,27 @@
+const std = @import("std");
+
+/// Produces an HTML page listing the environment variables.
+pub fn main() !void {
+ const stdout = std.io.getStdOut().writer();
+ //
+ try stdout.writeAll("Content-Type: text/html\r\n");
+ try stdout.writeAll("\r\n");
+ try stdout.writeAll(
+ \\<!doctype HTML>
+ \\<html>
+ \\<body>
+ \\<p>Environment variables passed to CGI script:</p>
+ \\<ul>
+ );
+ for (std.os.environ) |env| {
+ try stdout.writeAll("<li>");
+ const env_slice = std.mem.sliceTo(env, 0);
+ try stdout.writeAll(env_slice);
+ try stdout.writeAll("</li>\n");
+ }
+ try stdout.writeAll(
+ \\</ul>
+ \\</body>
+ \\</html>
+ );
+}