[#568] Update docs

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

CHANGELOG.md

@@ -7,6 +7,24 @@ This document outlines major changes between releases.
 ### Fixed
 - Empty bucket policy (#740) 
 
+### Changed
+- Placement policy configuration (#568)
+
+### Updating from v0.25.0
+New config parameters were added. And old one `defaul_policy` were changed.
+```yaml
+placement_policy:
+  default: "REP 3"
+  region_mapping: /path/to/container/policies.json
+```
+
+Make sure you update the config accordingly:
+If you configure application using environment variables change:
+* `S3_GW_DEFAULT_POLICY` -> `S3_GW_PLACEMENT_POLICY_DEFAULT_POLICY`
+
+If you configure application using `.yaml` file change:
+* `defaul_policy` -> `placement_policy.default`
+
 ## [0.25.0] - 2022-10-31
 
 ### Fixed

config/config.env

@@ -99,7 +99,10 @@ S3_GW_NATS_ROOT_CA=/path/to/ca
 # Default policy of placing containers in NeoFS
 # If a user sends a request `CreateBucket` and doesn't define policy for placing of a container in NeoFS, the S3 Gateway
 # will put the container with default policy. It can be specified via environment variable, e.g.:
-S3_GW_DEFAULT_POLICY="REP 3"
+S3_GW_PLACEMENT_POLICY_DEFAULT_POLICY="REP 3"
+# Region to placement policy mapping json file.
+# Path to container policy mapping. The same as '--container-policy' flag for authmate
+S3_GW_PLACEMENT_POLICY_REGION_MAPPING=/path/to/container/policy.json
 
 # CORS
 # value of Access-Control-Max-Age header if this value is not set in a rule. Has an int type.

config/config.yaml

@@ -110,10 +110,15 @@ nats:
   key_file: /path/to/key
   root_ca: /path/to/ca
 
+# Parameters of NeoFS container placement policy
+placement_policy:
   # Default policy of placing containers in NeoFS
   # If a user sends a request `CreateBucket` and doesn't define policy for placing of a container in NeoFS, the S3 Gateway
-# will put the container with default policy. It can be specified via environment variable, e.g.:
+  # will put the container with default policy.
-default_policy: REP 3
+  default: REP 3
+  # Region to placement policy mapping json file.
+  # Path to container policy mapping. The same as '--container-policy' flag for authmate
+  region_mapping: /path/to/container/policy.json
 
 # CORS
 # value of Access-Control-Max-Age header if this value is not set in a rule. Has an int type.

docs/configuration.md

@@ -150,10 +150,11 @@ There are some custom types used for brevity:
 ### Structure
 
 | Section            | Description                                                 |
-|--------------|---------------------------------------------------|
+|--------------------|-------------------------------------------------------------|
 | no section         | [General parameters](#general-section)                      |
 | `wallet`           | [Wallet configuration](#wallet-section)                     |
 | `peers`            | [Nodes configuration](#peers-section)                       |
+| `placement_policy` | [Placement policy configuration](#placement_policy-section) |
 | `tls`              | [TLS configuration](#tls-section)                           |
 | `logger`           | [Logger configuration](#logger-section)                     |
 | `tree`             | [Tree configuration](#tree-section)                         |
@@ -186,8 +187,6 @@ pool_error_threshold: 100
 max_clients_count: 100
 max_clients_deadline: 30s
 
-default_policy: REP 3
-
 allowed_access_key_id_prefixes: 
    - Ck9BHsgKcnwfCTUSFm6pxhoNS4cBqgN2NQ8zVgPjqZDX
    - 3stjWenX15YwYzczMr88gy3CQr4NYFBQ8P7keGzH5QFn
@@ -205,7 +204,6 @@ allowed_access_key_id_prefixes:
 | `pool_error_threshold`           | `uint32`   |               | `100`          | The number of errors on connection after which node is considered as unhealthy.                                                                                                                                   |
 | `max_clients_count`              | `int`      |               | `100`          | Limits for processing of clients' requests.                                                                                                                                                                       |
 | `max_clients_deadline`           | `duration` |               | `30s`          | Deadline after which the gate sends error `RequestTimeout` to a client.                                                                                                                                           |
-| `default_policy`                 | `string`   |               | `REP 3`        | Default policy of placing containers in NeoFS. If a user sends a request `CreateBucket` and doesn't define policy for placing of a container in NeoFS, the S3 Gateway will put the container with default policy. |
 | `allowed_access_key_id_prefixes` | `[]string` |               |                | List of allowed `AccessKeyID` prefixes which S3 GW serve. If the parameter is omitted, all `AccessKeyID` will be accepted.                                                                                        |
 
 ### `wallet` section
@@ -254,6 +252,30 @@ peers:
 | `priority` | `int`    | `1`           | It allows to group nodes and don't switch group until all nodes with the same priority will be unhealthy. The lower the value, the higher the priority. |
 | `weight`   | `float`  | `1`           | Weight of node in the group with the same priority. Distribute requests to nodes proportionally to these values.                                        |
 
+
+### `placement_policy` section
+
+```yaml
+placement_policy:
+  default: REP 3
+  region_mapping: /path/to/mapping/rules.json
+```
+
+| Parameter        | Type     | Default value | Description                                                                                                                                                                                                       |
+|------------------|----------|---------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `default`        | `string` | `REP 3`       | Default policy of placing containers in NeoFS. If a user sends a request `CreateBucket` and doesn't define policy for placing of a container in NeoFS, the S3 Gateway will put the container with default policy. |
+| `region_mapping` | `string` |               | Path to file that maps aws `LocationContraint` values to NeoFS placement policy. The similar to `--container-policy` flag in `neofs-s3-authmate` util.                                                            |
+
+File for `region_mapping` must contain something like this:
+
+```json
+{
+   "rep-3": "REP 3",
+   "complex": "REP 1 IN X CBF 1 SELECT 1 FROM * AS X",
+   "example-json-policy": "{\"replicas\":[{\"count\":3,\"selector\":\"SelASD0\"}],\"container_backup_factor\":3,\"selectors\":[{\"name\":\"SelASD0\",\"count\":3,\"filter\":\"*\"}],\"filters\":[]}"
+}
+```
+
 ### `tls` section
 
 ```yaml