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#!/usr/bin/env python3
import argparse
import os
import pathlib
import subprocess
import tarfile
import requests
import sys
#
# GoVPP API generator generates Go bindings compatible with the local VPP
#
parser = argparse.ArgumentParser()
parser.add_argument("-govpp-commit", help="GoVPP commit or branch (defaults to v0.3.5-45-g671f16c)",
default="671f16c", # fixed GoVPP version
type=str)
parser.add_argument("-output-dir", help="output target directory for generated bindings", type=str)
parser.add_argument("-api-files", help="api files to generate (without commas)", nargs="+", type=str)
parser.add_argument("-import-prefix", help="prefix imports in the generated go code", type=str)
parser.add_argument("-no-source-path-info", help="disable source path info in generated files", nargs='?', const=True,
default=False)
args = parser.parse_args()
# Check input arguments
def validate_args(vpp_dir, o, f, c, i):
if o is not None:
if not os.path.exists(o) or os.path.isfile(o):
print(o + " is not a valid output path")
sys.exit(1)
else:
o = vpp_dir
if f is None:
f = []
if c is None:
c = "671f16c"
if i is None:
i = ""
return str(o), f, c, i
# Returns version of the installed Go
def get_go_version(go_root):
p = subprocess.Popen(["./go", "version"],
cwd=go_root + "/bin",
stdout=subprocess.PIPE,
universal_newlines=True, )
output, _ = p.communicate()
output_fmt = output.replace("go version go", "", 1)
return output_fmt.rstrip("\n")
# Returns version of the installed binary API generator
def get_binapi_gen_version(go_path):
p = subprocess.Popen(["./binapi-generator", "-version"],
cwd=go_path + "/bin",
stdout=subprocess.PIPE,
universal_newlines=True, )
output, _ = p.communicate()
output_fmt = output.replace("govpp", "", 1)
return output_fmt.rstrip("\n")
# Verifies local Go installation and installs the latest
# one if missing
def install_golang(go_root):
go_bin = go_root + "/bin/go"
if os.path.exists(go_bin) and os.path.isfile(go_bin):
print('Go ' + get_go_version(go_root) + ' is already installed')
return
print("Go binary not found, installing the latest version...")
go_folders = ['src', 'pkg', 'bin']
for f in go_folders:
if not os.path.exists(os.path.join(go_root, f)):
os.makedirs(os.path.join(go_root, f))
filename = requests.get('https://golang.org/VERSION?m=text').text + ".linux-amd64.tar.gz"
url = "https://dl.google.com/go/" + filename
r = requests.get(url)
with open("/tmp/" + filename, 'wb') as f:
f.write(r.content)
go_tf = tarfile.open("/tmp/" + filename)
# Strip /go dir from the go_root path as it will
# be created while extracting the tar file
go_root_head, _ = os.path.split(go_root)
go_tf.extractall(path=go_root_head)
go_tf.close()
os.remove("/tmp/" + filename)
print('Go ' + get_go_version(go_root) + ' was installed')
# Installs latest binary API generator
def install_binapi_gen(c, go_root, go_path):
os.environ['GO111MODULE'] = "on"
if os.path.exists(go_root + "/bin/go") & os.path.isfile(go_root + "/bin/go"):
p = subprocess.Popen(["./go", "get", "git.fd.io/govpp.git/cmd/binapi-generator@" + c],
cwd=go_root + "/bin",
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True, )
_, error = p.communicate()
if p.returncode != 0:
print("binapi generator installation failed: %d %s" % (p.returncode, error))
sys.exit(1)
bg_ver = get_binapi_gen_version(go_path)
print('Installed binary API generator ' + bg_ver)
# Creates generated bindings using GoVPP binapigen to the target folder
def generate_api(output_dir, vpp_dir, api_list, import_prefix, no_source, go_path):
output_binapi = output_dir + "binapi" if output_dir[-1] == "/" else output_dir + "/binapi"
json_dir = vpp_dir + "/build-root/install-vpp-native/vpp/share/vpp/api"
if not os.path.exists(json_dir):
print("Missing JSON api definitions")
sys.exit(1)
print("Generating API")
cmd = ["./binapi-generator", "--output-dir=" + output_binapi, "--input-dir=" + json_dir]
if len(api_list):
print("Following API files were requested by 'GO_API_FILES': " + str(api_list))
print("Note that dependency requirements may generate additional API files")
cmd.append(api_list)
if not import_prefix == "":
cmd.append("-import-prefix=" + import_prefix)
if no_source:
cmd.append("-no-source-path-info")
p = subprocess.Popen(cmd, cwd=go_path + "/bin",
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
universal_newlines=True, )
out = p.communicate()[1]
if p.returncode != 0:
print("go api generate failed: %d %s" % (p.returncode, out))
sys.exit(1)
# Print nice output of the binapi generator
for msg in out.split():
if "=" in msg:
print()
print(msg, end=" ")
print("\n")
print("Go API bindings were generated to " + output_binapi)
def main():
# project root directory
root = pathlib.Path(os.path.dirname(os.path.abspath(__file__)))
vpp_dir: str = root.parent.parent.parent
o, f, c, i = validate_args(vpp_dir, args.output_dir, args.api_files, args.govpp_commit,
args.import_prefix)
# go specific environment variables
if "GOROOT" in os.environ:
go_root = os.environ['GOROOT']
else:
go_root = os.environ['HOME'] + "/.go"
if "GOPATH" in os.environ:
go_path = os.environ['GOPATH']
else:
go_path = os.environ['HOME'] + "/go"
install_golang(go_root)
install_binapi_gen(c, go_root, go_path)
generate_api(o, str(vpp_dir), f, i, args.no_source_path_info, go_path)
if __name__ == "__main__":
main()
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