Update p4rt configuration to match SONiC upstream schema. (#10725)

*The initial commit for the P4RT docker hard coded all the flags which makes it difficult to configure at runtime. Reading them from the CONFIG_DB allows for more flexibility.

dockers/docker-sonic-p4rt/Dockerfile.j2

@@ -24,6 +24,7 @@ RUN apt-get clean -y      && \
     rm -rf /debs
 
 COPY ["start.sh", "p4rt.sh", "/usr/bin/"]
+COPY ["p4rt_vars.j2", "/usr/share/sonic/templates/"]
 COPY ["supervisord.conf", "/etc/supervisor/conf.d/"]
 COPY ["files/supervisor-proc-exit-listener", "/usr/bin"]
 COPY ["critical_processes", "/etc/supervisor"]

dockers/docker-sonic-p4rt/p4rt.sh

@@ -1,5 +1,95 @@
 #!/usr/bin/env bash
 
+EXIT_P4RT_VARS_FILE_NOT_FOUND=1
+readonly P4RT_VARS_FILE=/usr/share/sonic/templates/p4rt_vars.j2
+
+if [ ! -f "${P4RT_VARS_FILE}" ]; then
+    echo "P4rt vars template file not found"
+    exit ${EXIT_P4RT_VARS_FILE_NOT_FOUND}
+fi
+
+# Try to read p4rt and certs config from ConfigDB.
+# Use default value if no valid config exists
+P4RT_VARS=$(sonic-cfggen -d -t ${P4RT_VARS_FILE})
+readonly P4RT_VARS=${P4RT_VARS//[\']/\"}
+readonly X509=$(echo ${P4RT_VARS} | jq -r '.x509')
+readonly P4RT=$(echo ${P4RT_VARS} | jq -r '.p4rt')
+readonly CERTS=$(echo ${P4RT_VARS} | jq -r '.certs')
+
 P4RT_ARGS=" --alsologtostderr --logbuflevel=-1"
 
+if [ -n "${CERTS}" ]; then
+    readonly SERVER_CRT=$(echo ${CERTS} | jq -r '.server_crt // empty')
+    readonly SERVER_KEY=$(echo ${CERTS} | jq -r '.server_key // empty')
+    if [ -z "${SERVER_CRT}"  ] || [ -z "${SERVER_KEY}"  ]; then
+        P4RT_ARGS+=" --use_insecure_server_credentials"
+    else
+        P4RT_ARGS+=" --server_certificate_file=${SERVER_CRT} --server_key_file=${SERVER_KEY}"
+    fi
+
+    readonly CA_CRT=$(echo ${CERTS} | jq -r '.ca_crt // empty')
+    if [ ! -z "${CA_CRT}" ]; then
+        P4RT_ARGS+=" --ca_certificate_file=${CA_CRT}"
+        readonly CRL=$(echo ${CERTS} | jq -r '.cert_crl_dir // empty')
+        if [ ! -z "$CRL" ]; then
+            P4RT_ARGS+=" --cert_crl_dir=${CRL}"
+        fi
+    fi
+elif [ -n "${X509}" ]; then
+    readonly SERVER_CRT=$(echo ${X509} | jq -r '.server_crt // empty')
+    readonly SERVER_KEY=$(echo ${X509} | jq -r '.server_key // empty')
+    if [ -z "${SERVER_CRT}"  ] || [ -z "${SERVER_KEY}"  ]; then
+        P4RT_ARGS+=" --use_insecure_server_credentials"
+    else
+        P4RT_ARGS+=" --server_certificate_file=${SERVER_CRT} --server_key_file=${SERVER_KEY}"
+    fi
+
+    readonly CA_CRT=$(echo ${X509} | jq -r '.ca_crt // empty')
+    if [ ! -z "${CA_CRT}" ]; then
+        P4RT_ARGS+=" --ca_certificate_file=${CA_CRT}"
+        readonly CRL=$(echo ${X509} | jq -r '.cert_crl_dir // empty')
+        if [ ! -z "$CRL" ]; then
+            P4RT_ARGS+=" --cert_crl_dir=${CRL}"
+        fi
+    fi
+else
+    P4RT_ARGS+=" --use_insecure_server_credentials"
+fi
+
+# Try to read P4RT authorization config from ConfigDB.
+readonly AUTHZ_FILE=$(echo ${P4RT} | jq -r '.authz_policy // empty')
+if [ ! -z "${AUTHZ_FILE}" ]; then
+    P4RT_ARGS+=" --authz_policy_enabled --authorization_policy_file=${AUTHZ_FILE}"
+fi
+
+# Try to read P4RT port config from ConfigDB.
+readonly PORT=$(echo ${P4RT} | jq -r '.port // empty')
+if [ ! -z "${PORT}" ]; then
+    P4RT_ARGS+=" --p4rt_grpc_port=${PORT}"
+fi
+
+# Try to read P4RT genetlink config from ConfigDB.
+readonly GENETLINK=$(echo ${P4RT} | jq -r '.use_genetlink // empty')
+if [ ! -z "${GENETLINK}" ]; then
+    P4RT_ARGS+=" --use_genetlink=${GENETLINK}"
+fi
+
+# Try to read P4RT port ID config from ConfigDB.
+readonly PORT_ID=$(echo ${P4RT} | jq -r '.use_port_ids // empty')
+if [ ! -z "${PORT_ID}" ]; then
+    P4RT_ARGS+=" --use_port_ids=${PORT_ID}"
+fi
+
+# Try to read P4RT save forwarding config from ConfigDB.
+readonly SAVE_FORWARDING_CONFIG=$(echo ${P4RT} | jq -r '.save_forwarding_config_file // empty')
+if [ ! -z "${SAVE_FORWARDING_CONFIG}" ]; then
+    P4RT_ARGS+=" --save_forwarding_config_file=${SAVE_FORWARDING_CONFIG}"
+fi
+
+# Try to read P4RT unix socket config from ConfigDB.
+readonly UNIX_SOCKET=$(echo ${P4RT} | jq -r '.p4rt_unix_socket // empty')
+if [ ! -z "${UNIX_SOCKET}" ]; then
+    P4RT_ARGS+=" --p4rt_unix_socket=${UNIX_SOCKET}"
+fi
+
 exec /usr/local/bin/p4rt ${P4RT_ARGS}

dockers/docker-sonic-p4rt/p4rt_vars.j2

@@ -0,0 +1,5 @@
+{
+    "certs": {% if P4RT %}{% if "certs" in P4RT.keys() %}{{ P4RT["certs"] }}{% else %}""{% endif %}{% else %}""{% endif %},
+    "p4rt" : {% if P4RT %}{% if "p4rt_app" in P4RT.keys() %}{{ P4RT["p4rt_app"] }}{% else %}""{% endif %}{% else %}""{% endif %},
+    "x509" : {% if DEVICE_METADATA %}{% if "x509" in DEVICE_METADATA.keys() %}{{ DEVICE_METADATA["x509"] }}{% else %}""{% endif %}{% else %}""{% endif %}
+}