94 lines
2.5 KiB
C
94 lines
2.5 KiB
C
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// Copyright 2023 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "examples.h"
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// Hello World! NATS microservice example.
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//
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// Requires NATS server and CLI, and the nats.c examples fully built. See
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// https://github.com/nats-io/nats.c#building
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//
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// RUN:
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// ```sh
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// $NATS_SERVER & # NATS_SERVER points to the NATS server binary
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// nats_pid=$!
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// sleep 2 # wait for server to start
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// ./examples/nats-micro-hello &
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// hello_pid=$!
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// sleep 2 # wait for microservice to start
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// nats request 'hello' ''
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// kill $hello_pid $nats_pid
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// ```
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//
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// OUTPUT:
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// ```
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// 06:34:57 Sending request on "hello"
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// 06:34:57 Received with rtt 1.08ms
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// Hello, World!
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// ```
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#define HELLO "Hello, World!"
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static microError *
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handle(microRequest *req)
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{
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return microRequest_Respond(req, HELLO, sizeof(HELLO));
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}
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int main(int argc, char **argv)
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{
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natsStatus s = NATS_OK;
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microError *err = NULL;
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natsConnection *conn = NULL;
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natsOptions *opts = NULL;
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microService *m = NULL;
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char errorbuf[1024];
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microEndpointConfig hello_cfg = {
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.Name = "hello",
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.Handler = handle,
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};
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microServiceConfig cfg = {
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.Description = "Hello World! - NATS microservice example in C",
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.Name = "c-hello",
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.Version = "1.0.0",
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.Endpoint = &hello_cfg,
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};
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// Connect and start the services
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opts = parseArgs(argc, argv, "");
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s = natsConnection_Connect(&conn, opts);
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if (s != NATS_OK)
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{
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printf("Error: %u - %s\n", s, natsStatus_GetText(s));
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nats_PrintLastErrorStack(stderr);
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natsOptions_Destroy(opts);
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return 1;
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}
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err = micro_AddService(&m, conn, &cfg);
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if (err == NULL)
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err = microService_Run(m);
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microService_Destroy(m);
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natsOptions_Destroy(opts);
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natsConnection_Destroy(conn);
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if (err != NULL)
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{
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printf("Error: %s\n", microError_String(err, errorbuf, sizeof(errorbuf)));
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microError_Destroy(err);
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return 1;
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}
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return 0;
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}
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