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request.zig
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request.zig
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const std = @import("std");
/// Request is a struct that represents a JSON-RPC request.
/// It is used to build a JSON-RPC request and serialize it to a string.
/// Parameters and config added must contain primitive types, or types
/// implementing jsonStringify (see std.json.Value.jsonStringify for example)
pub const Request = struct {
id: u64,
jsonrpc: []const u8,
method: []const u8,
params: std.ArrayList(u8),
pub fn init(
allocator: std.mem.Allocator,
method: []const u8,
) !Request {
var params = std.ArrayList(u8).init(allocator);
try params.append('[');
return .{
.id = 1,
.jsonrpc = "2.0",
.method = method,
.params = params,
};
}
pub fn deinit(self: Request) void {
self.params.deinit();
}
pub fn addParameter(self: *Request, param: anytype) !void {
try std.json.stringify(param, .{}, self.params.writer());
try self.params.append(',');
}
pub fn addOptionalParameter(self: *Request, maybe_param: anytype) !void {
if (maybe_param) |param| try self.addParameter(param);
}
pub fn addConfig(self: *Request, config: anytype) !void {
const default = @TypeOf(config){};
if (!std.meta.eql(default, config)) {
try std.json.stringify(config, .{ .emit_null_optional_fields = true }, self.params.writer());
try self.params.append(',');
}
}
pub fn toJsonString(self: Request, allocator: std.mem.Allocator) ![]const u8 {
if (self.params.items.len > 1) {
self.params.items[self.params.items.len - 1] = ']';
return try std.fmt.allocPrint(
allocator,
"{{\"id\":{},\"jsonrpc\":\"{s}\",\"method\":\"{s}\",\"params\":{s}}}",
.{
self.id,
self.jsonrpc,
self.method,
self.params.items,
},
);
} else {
return try std.fmt.allocPrint(
allocator,
"{{\"id\":{d},\"jsonrpc\":\"{s}\",\"method\":\"{s}\"}}",
.{
self.id,
self.jsonrpc,
self.method,
},
);
}
}
};
test "Request.toJsonString" {
const allocator = std.testing.allocator;
const Config = struct {
key: []const u8 = "default",
};
var request = try Request.init(allocator, "getAccountInfo");
defer request.deinit();
var signatures = std.ArrayList([]const u8).init(allocator);
defer signatures.deinit();
try signatures.append("signature1");
try signatures.append("signature2");
try request.addParameter("mypubkey");
try request.addParameter(35);
try request.addParameter(true);
try request.addParameter(null);
try request.addParameter(signatures.items);
try request.addConfig(Config{});
try request.addConfig(Config{ .key = "non-default" });
const expected = "{\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"getAccountInfo\",\"params\":[\"mypubkey\",35,true,null,[\"signature1\",\"signature2\"],{\"key\":\"non-default\"}]}";
const actual = try request.toJsonString(allocator);
defer allocator.free(actual);
try std.testing.expectEqualSlices(u8, expected, actual);
}