nixpkgs-custom/nixos/tests/etcd-cluster.nix

# This test runs simple etcd cluster

import ./make-test.nix ({ pkgs, ... } : let

  runWithOpenSSL = file: cmd: pkgs.runCommand file {
    buildInputs = [ pkgs.openssl ];
  } cmd;

  ca_key = runWithOpenSSL "ca-key.pem" "openssl genrsa -out $out 2048";
  ca_pem = runWithOpenSSL "ca.pem" ''
    openssl req \
      -x509 -new -nodes -key ${ca_key} \
      -days 10000 -out $out -subj "/CN=etcd-ca"
  '';
  etcd_key = runWithOpenSSL "etcd-key.pem" "openssl genrsa -out $out 2048";
  etcd_csr = runWithOpenSSL "etcd.csr" ''
    openssl req \
       -new -key ${etcd_key} \
       -out $out -subj "/CN=etcd" \
       -config ${openssl_cnf}
  '';
  etcd_cert = runWithOpenSSL "etcd.pem" ''
    openssl x509 \
      -req -in ${etcd_csr} \
      -CA ${ca_pem} -CAkey ${ca_key} \
      -CAcreateserial -out $out \
      -days 365 -extensions v3_req \
      -extfile ${openssl_cnf}
  '';

  etcd_client_key = runWithOpenSSL "etcd-client-key.pem"
    "openssl genrsa -out $out 2048";

  etcd_client_csr = runWithOpenSSL "etcd-client-key.pem" ''
    openssl req \
      -new -key ${etcd_client_key} \
      -out $out -subj "/CN=etcd-client" \
      -config ${client_openssl_cnf}
  '';

  etcd_client_cert = runWithOpenSSL "etcd-client.crt" ''
    openssl x509 \
      -req -in ${etcd_client_csr} \
      -CA ${ca_pem} -CAkey ${ca_key} -CAcreateserial \
      -out $out -days 365 -extensions v3_req \
      -extfile ${client_openssl_cnf}
  '';

  openssl_cnf = pkgs.writeText "openssl.cnf" ''
    ions = v3_req
    distinguished_name = req_distinguished_name
    [req_distinguished_name]
    [ v3_req ]
    basicConstraints = CA:FALSE
    keyUsage = digitalSignature, keyEncipherment
    extendedKeyUsage = serverAuth
    subjectAltName = @alt_names
    [alt_names]
    DNS.1 = node1
    DNS.2 = node2
    DNS.3 = node3
    IP.1 = 127.0.0.1
  '';

  client_openssl_cnf = pkgs.writeText "client-openssl.cnf" ''
    ions = v3_req
    distinguished_name = req_distinguished_name
    [req_distinguished_name]
    [ v3_req ]
    basicConstraints = CA:FALSE
    keyUsage = digitalSignature, keyEncipherment
    extendedKeyUsage = clientAuth
  '';

  nodeConfig = {
    services = {
      etcd = {
        enable = true;
        keyFile = etcd_key;
        certFile = etcd_cert;
        trustedCaFile = ca_pem;
        peerClientCertAuth = true;
        listenClientUrls = ["https://127.0.0.1:2379"];
        listenPeerUrls = ["https://0.0.0.0:2380"];
      };
    };

    environment.variables = {
      ETCDCTL_CERT_FILE = "${etcd_client_cert}";
      ETCDCTL_KEY_FILE = "${etcd_client_key}";
      ETCDCTL_CA_FILE = "${ca_pem}";
      ETCDCTL_PEERS = "https://127.0.0.1:2379";
    };

    networking.firewall.allowedTCPPorts = [ 2380 ];
  };
in {
  name = "etcd";

  meta = with pkgs.stdenv.lib.maintainers; {
    maintainers = [ offline ];
  };

  nodes = {
    node1 = { config, pkgs, nodes, ... }: {
      require = [nodeConfig];
      services.etcd = {
        initialCluster = ["node1=https://node1:2380" "node2=https://node2:2380"];
        initialAdvertisePeerUrls = ["https://node1:2380"];
      };
    };

    node2 = { config, pkgs, ... }: {
      require = [nodeConfig];
      services.etcd = {
        initialCluster = ["node1=https://node1:2380" "node2=https://node2:2380"];
        initialAdvertisePeerUrls = ["https://node2:2380"];
      };
    };

    node3 = { config, pkgs, ... }: {
      require = [nodeConfig];
      services.etcd = {
        initialCluster = ["node1=https://node1:2380" "node2=https://node2:2380" "node3=https://node3:2380"];
        initialAdvertisePeerUrls = ["https://node3:2380"];
        initialClusterState = "existing";
      };
    };
  };

  testScript = ''
    subtest "should start etcd cluster", sub {
      $node1->start();
      $node2->start();
      $node1->waitForUnit("etcd.service");
      $node2->waitForUnit("etcd.service");
      $node2->waitUntilSucceeds("etcdctl cluster-health");
      $node1->succeed("etcdctl set /foo/bar 'Hello world'");
      $node2->succeed("etcdctl get /foo/bar | grep 'Hello world'");
    };

    subtest "should add another member", sub {
      $node1->succeed("etcdctl member add node3 https://node3:2380");
      $node3->start();
      $node3->waitForUnit("etcd.service");
      $node3->waitUntilSucceeds("etcdctl member list | grep 'node3'");
      $node3->succeed("etcdctl cluster-health");
    };

    subtest "should survive member crash", sub {
      $node3->crash;
      $node1->succeed("etcdctl cluster-health");
      $node1->succeed("etcdctl set /foo/bar 'Hello degraded world'");
      $node1->succeed("etcdctl get /foo/bar | grep 'Hello degraded world'");
    };
  '';
})