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import os
from stone.backend import CodeBackend
from stone.ir import (
is_void_type,
is_struct_type
)
from go_helpers import (
HEADER,
fmt_type,
fmt_var,
generate_doc,
)
class GoClientBackend(CodeBackend):
def generate(self, api):
for namespace in api.namespaces.values():
if len(namespace.routes) > 0:
self._generate_client(namespace)
def _generate_client(self, namespace):
file_name = os.path.join(self.target_folder_path, namespace.name,
'client.go')
with self.output_to_relative_path(file_name):
self.emit_raw(HEADER)
self.emit()
self.emit('package %s' % namespace.name)
self.emit()
self.emit('// Client interface describes all routes in this namespace')
with self.block('type Client interface'):
for route in namespace.routes:
generate_doc(self, route)
self.emit(self._generate_route_signature(namespace, route))
self.emit()
self.emit('type apiImpl dropbox.Context')
for route in namespace.routes:
self._generate_route(namespace, route)
self.emit('// New returns a Client implementation for this namespace')
with self.block('func New(c dropbox.Config) Client'):
self.emit('ctx := apiImpl(dropbox.NewContext(c))')
self.emit('return &ctx')
def _generate_route_signature(self, namespace, route):
req = fmt_type(route.arg_data_type, namespace)
res = fmt_type(route.result_data_type, namespace, use_interface=True)
fn = fmt_var(route.name)
if route.version != 1:
fn += 'V%d' % route.version
style = route.attrs.get('style', 'rpc')
arg = '' if is_void_type(route.arg_data_type) else 'arg {req}'
ret = '(err error)' if is_void_type(route.result_data_type) else \
'(res {res}, err error)'
signature = '{fn}(' + arg + ') ' + ret
if style == 'download':
signature = '{fn}(' + arg + \
') (res {res}, content io.ReadCloser, err error)'
elif style == 'upload':
signature = '{fn}(' + arg + ', content io.Reader) ' + ret
if is_void_type(route.arg_data_type):
signature = '{fn}(content io.Reader) ' + ret
return signature.format(fn=fn, req=req, res=res)
def _generate_route(self, namespace, route):
out = self.emit
route_name = route.name
if route.version != 1:
route_name += '_v%d' % route.version
fn = fmt_var(route.name)
if route.version != 1:
fn += 'V%d' % route.version
err = fmt_type(route.error_data_type, namespace)
out('//%sAPIError is an error-wrapper for the %s route' %
(fn, route_name))
with self.block('type {fn}APIError struct'.format(fn=fn)):
out('dropbox.APIError')
out('EndpointError {err} `json:"error"`'.format(err=err))
out()
signature = 'func (dbx *apiImpl) ' + self._generate_route_signature(
namespace, route)
with self.block(signature):
if route.deprecated is not None:
out('log.Printf("WARNING: API `%s` is deprecated")' % fn)
if route.deprecated.by is not None:
replacement_fn = fmt_var(route.deprecated.by.name)
if route.deprecated.by.version != 1:
replacement_fn += "V%d" % route.deprecated.by.version
out('log.Printf("Use API `%s` instead")' % replacement_fn)
out()
args = {
"Host": route.attrs.get('host', 'api'),
"Namespace": namespace.name,
"Route": route_name,
"Auth": route.attrs.get('auth', ''),
"Style": route.attrs.get('style', 'rpc'),
}
with self.block('req := dropbox.Request'):
for k, v in args.items():
out(k + ':"' + v + '",')
out("Arg: {arg},".format(arg="arg" if not is_void_type(route.arg_data_type) else "nil"))
out("ExtraHeaders: {headers},".format(
headers="arg.ExtraHeaders" if fmt_var(route.name) == "Download" else "nil"))
out()
out("var resp []byte")
out("var respBody io.ReadCloser")
out("resp, respBody, err = (*dropbox.Context)(dbx).Execute(req, {body})".format(
body="content" if route.attrs.get('style', '') == 'upload' else "nil"))
with self.block("if err != nil"):
out("var appErr {fn}APIError".format(fn=fn))
out("err = {auth}ParseError(err, &appErr)".format(
auth="auth." if namespace.name != "auth" else ""))
with self.block("if err == &appErr"):
out("err = appErr")
out("return")
out()
if is_struct_type(route.result_data_type) and route.result_data_type.has_enumerated_subtypes():
out('var tmp %sUnion' % fmt_var(route.result_data_type.name, export=False))
with self.block('err = json.Unmarshal(resp, &tmp);'
'if err != nil'):
out('return')
with self.block('switch tmp.Tag'):
for t in route.result_data_type.get_enumerated_subtypes():
with self.block('case "%s":' % t.name, delim=(None, None)):
self.emit('res = tmp.%s' % fmt_var(t.name))
elif not is_void_type(route.result_data_type):
with self.block('err = json.Unmarshal(resp, &res);'
'if err != nil'):
out('return')
out()
else:
out("_ = resp")
if route.attrs.get('style', 'rpc') == "download":
out("content = respBody")
else:
out("_ = respBody")
out('return')
out()
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