Class: Agoo::GraphQL

Inherits:

Object

• Object
• Agoo::GraphQL

Defined in:

lib/agoo/graphql.rb,
lib/agoo/graphql/arg.rb,
lib/agoo/graphql/type.rb,
lib/agoo/graphql/field.rb,
ext/agoo/rgraphql.c

Defined Under Namespace

Classes: Arg, Field, Type

Class Method Summary

• .build_headers=(func) ⇒ Object

  call-seq: build_headers=(func).

• .headers(map) ⇒ Object

  call-seq: headers(header_hash).

• .load(sdl) ⇒ Object

  call-seq: load(sdl).

• .load_file(path) ⇒ Object

  call-seq: load_file(sdl_file).

• .publish(subject, event) ⇒ Object

  call-seq: publish(subject, event).

• .schema(root) ⇒ Object

  call-seq: schema(root) { }.

• .sdl_dump(options) ⇒ Object

  call-seq: sdl_dump().

• .sdl_types ⇒ Object

  call-seq: sdl_types().

Class Method Details

.build_headers=(func) ⇒ Object

call-seq: build_headers=(func)

Provide a function to call that builds headers for GraphQL responses. The function should expect a single request and should return a Hash of the headers to add. Content-Type and Content-Length should not be set.

# File 'ext/agoo/rgraphql.c', line 1000

static VALUE
graphql_build_headers(VALUE self, VALUE func) {
    gql_build_headers = build_headers;
    build_headers_func = func;
    rb_gc_register_address(&build_headers_func);

    return Qnil;
}

.headers(map) ⇒ Object

call-seq: headers(header_hash)

Provide a Hash to be used as the headers for GraphQL responses. Content-Type and Content-Length should not be set.

# File 'ext/agoo/rgraphql.c', line 1031

static VALUE
graphql_headers(VALUE self, VALUE map) {
    agooText	t = agoo_text_allocate(1024);

    rb_hash_foreach(map, headers_cb, (VALUE)&t);
    gql_headers = t;

    return Qnil;
}

.load(sdl) ⇒ Object

call-seq: load(sdl)

Load an SDL string. This should only be called in a block provided to a call to #schema.

# File 'ext/agoo/rgraphql.c', line 742

static VALUE
graphql_load(VALUE self, VALUE sdl) {
    struct _agooErr	err = AGOO_ERR_INIT;

    if (NULL == gql_root) {
	rb_raise(rb_eStandardError, "GraphQL root not set. Use Agoo::GraphQL.schema.");
    }
    rb_check_type(sdl, T_STRING);
    if (AGOO_ERR_OK != sdl_parse(&err, StringValuePtr(sdl), (int)RSTRING_LEN(sdl))) {
	rb_raise(rb_eStandardError, "%s", err.msg);
    }
    return Qnil;
}

.load_file(path) ⇒ Object

call-seq: load_file(sdl_file)

Load an SDL file. This should only be called in a block provided to a call to #schema.

# File 'ext/agoo/rgraphql.c', line 763

static VALUE
graphql_load_file(VALUE self, VALUE path) {
    struct _agooErr	err = AGOO_ERR_INIT;
    FILE		*f;
    long		len;
    char		*sdl;

    if (NULL == gql_root) {
	rb_raise(rb_eStandardError, "GraphQL root not set. Use Agoo::GraphQL.schema.");
    }
    rb_check_type(path, T_STRING);
    if (NULL == (f = fopen(StringValuePtr(path), "r"))) {
	rb_raise(rb_eIOError, "%s", strerror(errno));
    }
    if (0 != fseek(f, 0, SEEK_END)) {
	rb_raise(rb_eIOError, "%s", strerror(errno));
    }
    if (0 > (len = ftell(f))) {
	rb_raise(rb_eIOError, "%s", strerror(errno));
    }
    sdl = ALLOC_N(char, len + 1);
    if (0 != fseek(f, 0, SEEK_SET)) {
	rb_raise(rb_eIOError, "%s", strerror(errno));
    }
    if (len != (long)fread(sdl, 1, len, f)) {
	rb_raise(rb_eIOError, "%s", strerror(errno));
    } else {
	sdl[len] = '\0';
    }
    fclose(f);
    if (AGOO_ERR_OK != sdl_parse(&err, sdl, (int)len)) {
	xfree(sdl);
	rb_raise(rb_eStandardError, "%s", err.msg);
    }
    xfree(sdl);

    return Qnil;
}

.publish(subject, event) ⇒ Object

call-seq: publish(subject, event)

Publish an event on the given subject. A subject must be a String while the event must be one of the objects represented by the the GraphQL schema. Generally the subjects are selected to identify which objects are being published and should match the value returned by the subscription methods.

# File 'ext/agoo/rgraphql.c', line 928

static VALUE
graphql_publish(VALUE self, VALUE subject, VALUE event) {
    const char		*subj;
    struct _agooErr	err = AGOO_ERR_INIT;

    rb_check_type(subject, T_STRING);
    subj = StringValuePtr(subject);

    if (AGOO_ERR_OK != agoo_server_gpublish(&err, subj, (gqlRef)event)) {
	rb_raise(rb_eStandardError, "%s", err.msg);
    }
    return Qnil;
}

.schema(root) ⇒ Object

call-seq: schema(root) { }

Start the GraphQL/Ruby integration by assigning a root Ruby object to the GraphQL environment. Within the block passed to the function SDL strings or files can be loaded. On exiting the block validation of the loaded schema is performed.

Note that the _@ruby_ directive is added to the schema type as well as the Query, Mutation, and Subscription types based on the root class. Any _@ruby_ directives on the object types in the SDL will also associate a GraphQL and Ruby class. The association will be used to validate the Ruby class as a way to verify the class implements the methods described by the GraphQL type. The association is also use for resolving

# File 'ext/agoo/rgraphql.c', line 660

static VALUE
graphql_schema(VALUE self, VALUE root) {
    struct _agooErr	err = AGOO_ERR_INIT;
    gqlDir		dir;
    gqlDirUse		use;
    gqlType		schema_type;
    bool		fresh = false;
    gqlType		string_nn;

    if (!rb_block_given_p()) {
	rb_raise(rb_eStandardError, "A block is required.");
    }
    if (AGOO_ERR_OK != gql_init(&err)) {
	printf("*-*-* %s\n", err.msg);
	exit(1);
    }
    if (NULL == (dir = gql_directive_create(&err, "ruby", "Associates a Ruby class with a GraphQL type.", 0))) {
	printf("*-*-* %s\n", err.msg);
	exit(2);
    }
    if (NULL == (string_nn = gql_assure_nonnull(&err, &gql_string_type)) ||
	NULL == gql_dir_arg(&err, dir, "class", string_nn, NULL, 0, NULL)) {
	printf("*-*-* %s\n", err.msg);
	exit(3);
    }
    if (AGOO_ERR_OK != gql_directive_on(&err, dir, "SCHEMA", 6) ||
	AGOO_ERR_OK != gql_directive_on(&err, dir, "OBJECT", 6)) {
	printf("*-*-* %s\n", err.msg);
	exit(4);
    }
    gql_root = (gqlRef)root;
    vroot = root;
    rb_gc_register_address(&vroot);

    gql_doc_eval_func = eval_wrap;
    gql_resolve_func = resolve;
    gql_type_func = ref_type;
    gql_root_op = root_op;

    if (NULL == (use = gql_dir_use_create(&err, "ruby"))) {
	printf("*-*-* %s\n", err.msg);
	exit(5);
    }
    if (AGOO_ERR_OK != gql_dir_use_arg(&err, use, "class", gql_string_create(&err, rb_obj_classname(root), 0))) {
	printf("*-*-* %s\n", err.msg);
	exit(6);
    }
    rb_rescue2(rescue_yield, Qnil, rescue_yield_error, (VALUE)&err, rb_eException, (VALUE)0);
    if (AGOO_ERR_OK != err.code) {
	printf("*-*-* %s\n", err.msg);
	exit(7);
    }
    if (NULL == (schema_type = gql_type_get("schema"))) {
	if (NULL == (schema_type = gql_schema_create(&err, "The GraphQL root Object.", 0))) {
	    printf("*-*-* %s\n", err.msg);
	    exit(8);
	}
	fresh = true;
    }

    if (AGOO_ERR_OK != gql_type_directive_use(&err, schema_type, use) ||
	AGOO_ERR_OK != make_ruby_use(&err, root, "query", "Query", fresh, schema_type, "Root level query.") ||
	AGOO_ERR_OK != make_ruby_use(&err, root, "mutation", "Mutation", fresh, schema_type, "Root level mutation.") ||
	AGOO_ERR_OK != make_ruby_use(&err, root, "subscription", "Subscription", fresh, schema_type, "Root level subscription.")) {
	printf("*-*-* %s\n", err.msg);
	exit(9);
    }
    if (AGOO_ERR_OK != gql_validate(&err) ||
	AGOO_ERR_OK != build_type_class_map(&err)) {
	printf("*-*-* %s\n", err.msg);
	exit(10);
    }
    return Qnil;
}

.sdl_dump(options) ⇒ Object

call-seq: sdl_dump()

The preferred method of inspecting a GraphQL schema is to use introspection queries but for debugging and for reviewing the schema a dump of the schema as SDL can be helpful. The #sdl_dump method returns the schema as an SDL string.

• options [Hash] options

  • :with_description [true|false] if true the description strings are included. If false they are not included.

  • :all [true|false] if true all types and directives are included in the dump. If false only the user created types are include.

# File 'ext/agoo/rgraphql.c', line 818

static VALUE
graphql_sdl_dump(VALUE self, VALUE options) {
    agooText		t = agoo_text_allocate(4096);
    volatile VALUE	dump;
    VALUE		v;
    bool		with_desc = true;
    bool		all = false;

    Check_Type(options, T_HASH);

    v = rb_hash_aref(options, ID2SYM(rb_intern("with_descriptions")));
    if (Qnil != v) {
	with_desc = (Qtrue == v);
    }
    v = rb_hash_aref(options, ID2SYM(rb_intern("all")));
    if (Qnil != v) {
	all = (Qtrue == v);
    }
    if (NULL == (t = gql_schema_sdl(t, with_desc, all))) {
	rb_raise(rb_eNoMemError, "Failed to allocate memory for a schema dump.");
    }
    dump = rb_str_new(t->text, t->len);
    agoo_text_release(t);

    return dump;
}

.sdl_types ⇒ Object

call-seq: sdl_types()

Returns an array of all SDL types as Ruby objects.

# File 'ext/agoo/rgraphql.c', line 909

static VALUE
graphql_sdl_types(VALUE self) {
    VALUE	rtypes = rb_ary_new();

    gql_type_iterate(type_cb, (void*)rtypes);

    return rtypes;
}