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✏️ Editing: server_selection.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.MIN_SECONDARY_WRITE_WIRE_VERSION = void 0;
exports.writableServerSelector = writableServerSelector;
exports.sameServerSelector = sameServerSelector;
exports.secondaryWritableServerSelector = secondaryWritableServerSelector;
exports.readPreferenceServerSelector = readPreferenceServerSelector;
const error_1 = require("../error");
const read_preference_1 = require("../read_preference");
const common_1 = require("./common");
// max staleness constants
const IDLE_WRITE_PERIOD = 10000;
const SMALLEST_MAX_STALENESS_SECONDS = 90;
//  Minimum version to try writes on secondaries.
exports.MIN_SECONDARY_WRITE_WIRE_VERSION = 13;
/**
 * Returns a server selector that selects for writable servers
 */
function writableServerSelector() {
    return function writableServer(topologyDescription, servers) {
        return latencyWindowReducer(topologyDescription, servers.filter((s) => s.isWritable));
    };
}
/**
 * The purpose of this selector is to select the same server, only
 * if it is in a state that it can have commands sent to it.
 */
function sameServerSelector(description) {
    return function sameServerSelector(topologyDescription, servers) {
        if (!description)
            return [];
        // Filter the servers to match the provided description only if
        // the type is not unknown.
        return servers.filter(sd => {
            return sd.address === description.address && sd.type !== common_1.ServerType.Unknown;
        });
    };
}
/**
 * Returns a server selector that uses a read preference to select a
 * server potentially for a write on a secondary.
 */
function secondaryWritableServerSelector(wireVersion, readPreference) {
    // If server version < 5.0, read preference always primary.
    // If server version >= 5.0...
    // - If read preference is supplied, use that.
    // - If no read preference is supplied, use primary.
    if (!readPreference ||
        !wireVersion ||
        (wireVersion && wireVersion < exports.MIN_SECONDARY_WRITE_WIRE_VERSION)) {
        return readPreferenceServerSelector(read_preference_1.ReadPreference.primary);
    }
    return readPreferenceServerSelector(readPreference);
}
/**
 * Reduces the passed in array of servers by the rules of the "Max Staleness" specification
 * found here:
 *
 * @see https://github.com/mongodb/specifications/blob/master/source/max-staleness/max-staleness.md
 *
 * @param readPreference - The read preference providing max staleness guidance
 * @param topologyDescription - The topology description
 * @param servers - The list of server descriptions to be reduced
 * @returns The list of servers that satisfy the requirements of max staleness
 */
function maxStalenessReducer(readPreference, topologyDescription, servers) {
    if (readPreference.maxStalenessSeconds == null || readPreference.maxStalenessSeconds < 0) {
        return servers;
    }
    const maxStaleness = readPreference.maxStalenessSeconds;
    const maxStalenessVariance = (topologyDescription.heartbeatFrequencyMS + IDLE_WRITE_PERIOD) / 1000;
    if (maxStaleness < maxStalenessVariance) {
        throw new error_1.MongoInvalidArgumentError(`Option "maxStalenessSeconds" must be at least ${maxStalenessVariance} seconds`);
    }
    if (maxStaleness < SMALLEST_MAX_STALENESS_SECONDS) {
        throw new error_1.MongoInvalidArgumentError(`Option "maxStalenessSeconds" must be at least ${SMALLEST_MAX_STALENESS_SECONDS} seconds`);
    }
    if (topologyDescription.type === common_1.TopologyType.ReplicaSetWithPrimary) {
        const primary = Array.from(topologyDescription.servers.values()).filter(primaryFilter)[0];
        return servers.reduce((result, server) => {
            const stalenessMS = server.lastUpdateTime -
                server.lastWriteDate -
                (primary.lastUpdateTime - primary.lastWriteDate) +
                topologyDescription.heartbeatFrequencyMS;
            const staleness = stalenessMS / 1000;
            const maxStalenessSeconds = readPreference.maxStalenessSeconds ?? 0;
            if (staleness <= maxStalenessSeconds) {
                result.push(server);
            }
            return result;
        }, []);
    }
    if (topologyDescription.type === common_1.TopologyType.ReplicaSetNoPrimary) {
        if (servers.length === 0) {
            return servers;
        }
        const sMax = servers.reduce((max, s) => s.lastWriteDate > max.lastWriteDate ? s : max);
        return servers.reduce((result, server) => {
            const stalenessMS = sMax.lastWriteDate - server.lastWriteDate + topologyDescription.heartbeatFrequencyMS;
            const staleness = stalenessMS / 1000;
            const maxStalenessSeconds = readPreference.maxStalenessSeconds ?? 0;
            if (staleness <= maxStalenessSeconds) {
                result.push(server);
            }
            return result;
        }, []);
    }
    return servers;
}
/**
 * Determines whether a server's tags match a given set of tags
 *
 * @param tagSet - The requested tag set to match
 * @param serverTags - The server's tags
 */
function tagSetMatch(tagSet, serverTags) {
    const keys = Object.keys(tagSet);
    const serverTagKeys = Object.keys(serverTags);
    for (let i = 0; i < keys.length; ++i) {
        const key = keys[i];
        if (serverTagKeys.indexOf(key) === -1 || serverTags[key] !== tagSet[key]) {
            return false;
        }
    }
    return true;
}
/**
 * Reduces a set of server descriptions based on tags requested by the read preference
 *
 * @param readPreference - The read preference providing the requested tags
 * @param servers - The list of server descriptions to reduce
 * @returns The list of servers matching the requested tags
 */
function tagSetReducer(readPreference, servers) {
    if (readPreference.tags == null ||
        (Array.isArray(readPreference.tags) && readPreference.tags.length === 0)) {
        return servers;
    }
    for (let i = 0; i < readPreference.tags.length; ++i) {
        const tagSet = readPreference.tags[i];
        const serversMatchingTagset = servers.reduce((matched, server) => {
            if (tagSetMatch(tagSet, server.tags))
                matched.push(server);
            return matched;
        }, []);
        if (serversMatchingTagset.length) {
            return serversMatchingTagset;
        }
    }
    return [];
}
/**
 * Reduces a list of servers to ensure they fall within an acceptable latency window. This is
 * further specified in the "Server Selection" specification, found here:
 *
 * @see https://github.com/mongodb/specifications/blob/master/source/server-selection/server-selection.md
 *
 * @param topologyDescription - The topology description
 * @param servers - The list of servers to reduce
 * @returns The servers which fall within an acceptable latency window
 */
function latencyWindowReducer(topologyDescription, servers) {
    const low = servers.reduce((min, server) => Math.min(server.roundTripTime, min), Infinity);
    const high = low + topologyDescription.localThresholdMS;
    return servers.reduce((result, server) => {
        if (server.roundTripTime <= high && server.roundTripTime >= low)
            result.push(server);
        return result;
    }, []);
}
// filters
function primaryFilter(server) {
    return server.type === common_1.ServerType.RSPrimary;
}
function secondaryFilter(server) {
    return server.type === common_1.ServerType.RSSecondary;
}
function nearestFilter(server) {
    return server.type === common_1.ServerType.RSSecondary || server.type === common_1.ServerType.RSPrimary;
}
function knownFilter(server) {
    return server.type !== common_1.ServerType.Unknown;
}
function loadBalancerFilter(server) {
    return server.type === common_1.ServerType.LoadBalancer;
}
/**
 * Returns a function which selects servers based on a provided read preference
 *
 * @param readPreference - The read preference to select with
 */
function readPreferenceServerSelector(readPreference) {
    if (!readPreference.isValid()) {
        throw new error_1.MongoInvalidArgumentError('Invalid read preference specified');
    }
    return function readPreferenceServers(topologyDescription, servers, deprioritized = []) {
        const commonWireVersion = topologyDescription.commonWireVersion;
        if (commonWireVersion &&
            readPreference.minWireVersion &&
            readPreference.minWireVersion > commonWireVersion) {
            throw new error_1.MongoCompatibilityError(`Minimum wire version '${readPreference.minWireVersion}' required, but found '${commonWireVersion}'`);
        }
        if (topologyDescription.type === common_1.TopologyType.LoadBalanced) {
            return servers.filter(loadBalancerFilter);
        }
        if (topologyDescription.type === common_1.TopologyType.Unknown) {
            return [];
        }
        if (topologyDescription.type === common_1.TopologyType.Single) {
            return latencyWindowReducer(topologyDescription, servers.filter(knownFilter));
        }
        if (topologyDescription.type === common_1.TopologyType.Sharded) {
            const filtered = servers.filter(server => {
                return !deprioritized.includes(server);
            });
            const selectable = filtered.length > 0 ? filtered : deprioritized;
            return latencyWindowReducer(topologyDescription, selectable.filter(knownFilter));
        }
        const mode = readPreference.mode;
        if (mode === read_preference_1.ReadPreference.PRIMARY) {
            return servers.filter(primaryFilter);
        }
        if (mode === read_preference_1.ReadPreference.PRIMARY_PREFERRED) {
            const result = servers.filter(primaryFilter);
            if (result.length) {
                return result;
            }
        }
        const filter = mode === read_preference_1.ReadPreference.NEAREST ? nearestFilter : secondaryFilter;
        const selectedServers = latencyWindowReducer(topologyDescription, tagSetReducer(readPreference, maxStalenessReducer(readPreference, topologyDescription, servers.filter(filter))));
        if (mode === read_preference_1.ReadPreference.SECONDARY_PREFERRED && selectedServers.length === 0) {
            return servers.filter(primaryFilter);
        }
        return selectedServers;
    };
}
//# sourceMappingURL=server_selection.js.map

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