sandboxed-api/contrib/jsonnet/examples/jsonnet_yaml_stream_example.cc

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// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
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//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <cstdlib>
#include <iostream>
#include "contrib/jsonnet/jsonnet_base_sandbox.h"
#include "sandboxed_api/util/fileops.h"
#include "sandboxed_api/util/path.h"
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absl::Status JsonnetMain(std::string in_file, std::string out_file) {
using sapi::file::JoinPath;
using sapi::file_util::fileops::Basename;
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// Initialize sandbox.
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JsonnetBaseSandbox sandbox(in_file, out_file);
SAPI_RETURN_IF_ERROR(sandbox.Init());
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JsonnetApi api(&sandbox);
// Initialize library's main structure.
SAPI_ASSIGN_OR_RETURN(JsonnetVm * jsonnet_vm, api.c_jsonnet_make());
sapi::v::RemotePtr vm_pointer(jsonnet_vm);
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// Read input file.
std::string in_file_in_sandboxee(JoinPath("/input", Basename(in_file)));
sapi::v::ConstCStr in_file_var(in_file_in_sandboxee.c_str());
SAPI_ASSIGN_OR_RETURN(char* input,
api.c_read_input(false, in_file_var.PtrBefore()));
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// Process jsonnet data.
sapi::v::RemotePtr input_pointer(input);
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sapi::v::Int error;
SAPI_ASSIGN_OR_RETURN(char* output, api.c_jsonnet_evaluate_snippet_stream(
&vm_pointer, in_file_var.PtrBefore(),
&input_pointer, error.PtrAfter()));
CHECK(!error.GetValue())
<< "Jsonnet code evaluation failed: " << error.GetValue() << "\n"
<< "Make sure all files used by your jsonnet file are in the same "
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"directory as your file.";
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// Write data to file.
std::string out_file_in_sandboxee(JoinPath("/output", Basename(out_file)));
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sapi::v::ConstCStr out_file_var(out_file_in_sandboxee.c_str());
sapi::v::RemotePtr output_pointer(output);
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SAPI_ASSIGN_OR_RETURN(
bool success,
api.c_write_output_file(&output_pointer, out_file_var.PtrBefore()));
CHECK(success) << "Writing to output file failed: " << success;
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// Clean up.
SAPI_ASSIGN_OR_RETURN(char* result,
api.c_jsonnet_realloc(&vm_pointer, &output_pointer, 0));
SAPI_RETURN_IF_ERROR(api.c_jsonnet_destroy(&vm_pointer));
SAPI_RETURN_IF_ERROR(api.c_free_input(&input_pointer));
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return absl::OkStatus();
}
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int main(int argc, char* argv[]) {
using sapi::file_util::fileops::Basename;
google::InitGoogleLogging(argv[0]);
gflags::ParseCommandLineFlags(&argc, &argv, true);
if (!(argc == 3)) {
std::cerr << "Usage:\n"
<< Basename(argv[0])
<< " /absolute/path/to/INPUT.jsonnet /absolute/path/to/OUTPUT\n";
return EXIT_FAILURE;
}
std::string in_file(argv[1]);
std::string out_file(argv[2]);
absl::Status status = JsonnetMain(in_file, out_file);
if (!status.ok()) {
LOG(ERROR) << "Failed: " << status.ToString();
return EXIT_FAILURE;
}
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return EXIT_SUCCESS;
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}